Rename to Kelar Keyboard (org.kelar.inputmethod.latin)

7 files changed, 1776 insertions, 0 deletions

diff --git a/java/src/org/kelar/inputmethod/accessibility/AccessibilityLongPressTimer.java b/java/src/org/kelar/inputmethod/accessibility/AccessibilityLongPressTimer.java
new file mode 100644
index 000000000..bafa94167
--- /dev/null
+++ b/java/src/org/kelar/inputmethod/accessibility/AccessibilityLongPressTimer.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.kelar.inputmethod.accessibility;
+
+import android.content.Context;
+import android.os.Handler;
+import android.os.Message;
+
+import org.kelar.inputmethod.keyboard.Key;
+import org.kelar.inputmethod.latin.R;
+
+// Handling long press timer to show a more keys keyboard.
+final class AccessibilityLongPressTimer extends Handler {
+    public interface LongPressTimerCallback {
+        public void performLongClickOn(Key key);
+    }
+
+    private static final int MSG_LONG_PRESS = 1;
+
+    private final LongPressTimerCallback mCallback;
+    private final long mConfigAccessibilityLongPressTimeout;
+
+    public AccessibilityLongPressTimer(final LongPressTimerCallback callback,
+            final Context context) {
+        super();
+        mCallback = callback;
+        mConfigAccessibilityLongPressTimeout = context.getResources().getInteger(
+                R.integer.config_accessibility_long_press_key_timeout);
+    }
+
+    @Override
+    public void handleMessage(final Message msg) {
+        switch (msg.what) {
+        case MSG_LONG_PRESS:
+            cancelLongPress();
+            mCallback.performLongClickOn((Key)msg.obj);
+            return;
+        default:
+            super.handleMessage(msg);
+            return;
+        }
+    }
+
+    public void startLongPress(final Key key) {
+        cancelLongPress();
+        final Message longPressMessage = obtainMessage(MSG_LONG_PRESS, key);
+        sendMessageDelayed(longPressMessage, mConfigAccessibilityLongPressTimeout);
+    }
+
+    public void cancelLongPress() {
+        removeMessages(MSG_LONG_PRESS);
+    }
+}
diff --git a/java/src/org/kelar/inputmethod/accessibility/AccessibilityUtils.java b/java/src/org/kelar/inputmethod/accessibility/AccessibilityUtils.java
new file mode 100644
index 000000000..03daeb260
--- /dev/null
+++ b/java/src/org/kelar/inputmethod/accessibility/AccessibilityUtils.java
@@ -0,0 +1,266 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.kelar.inputmethod.accessibility;
+
+import android.content.Context;
+import android.media.AudioManager;
+import android.os.Build;
+import android.os.SystemClock;
+import android.provider.Settings;
+import androidx.core.view.accessibility.AccessibilityEventCompat;
+import android.text.TextUtils;
+import android.util.Log;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.ViewParent;
+import android.view.accessibility.AccessibilityEvent;
+import android.view.accessibility.AccessibilityManager;
+import android.view.inputmethod.EditorInfo;
+
+import org.kelar.inputmethod.compat.SettingsSecureCompatUtils;
+import org.kelar.inputmethod.latin.R;
+import org.kelar.inputmethod.latin.SuggestedWords;
+import org.kelar.inputmethod.latin.utils.InputTypeUtils;
+
+public final class AccessibilityUtils {
+    private static final String TAG = AccessibilityUtils.class.getSimpleName();
+    private static final String CLASS = AccessibilityUtils.class.getName();
+    private static final String PACKAGE =
+            AccessibilityUtils.class.getPackage().getName();
+
+    private static final AccessibilityUtils sInstance = new AccessibilityUtils();
+
+    private Context mContext;
+    private AccessibilityManager mAccessibilityManager;
+    private AudioManager mAudioManager;
+
+    /** The most recent auto-correction. */
+    private String mAutoCorrectionWord;
+
+    /** The most recent typed word for auto-correction. */
+    private String mTypedWord;
+
+    /*
+     * Setting this constant to {@code false} will disable all keyboard
+     * accessibility code, regardless of whether Accessibility is turned on in
+     * the system settings. It should ONLY be used in the event of an emergency.
+     */
+    private static final boolean ENABLE_ACCESSIBILITY = true;
+
+    public static void init(final Context context) {
+        if (!ENABLE_ACCESSIBILITY) return;
+
+        // These only need to be initialized if the kill switch is off.
+        sInstance.initInternal(context);
+    }
+
+    public static AccessibilityUtils getInstance() {
+        return sInstance;
+    }
+
+    private AccessibilityUtils() {
+        // This class is not publicly instantiable.
+    }
+
+    private void initInternal(final Context context) {
+        mContext = context;
+        mAccessibilityManager =
+                (AccessibilityManager) context.getSystemService(Context.ACCESSIBILITY_SERVICE);
+        mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
+    }
+
+    /**
+     * Returns {@code true} if accessibility is enabled. Currently, this means
+     * that the kill switch is off and system accessibility is turned on.
+     *
+     * @return {@code true} if accessibility is enabled.
+     */
+    public boolean isAccessibilityEnabled() {
+        return ENABLE_ACCESSIBILITY && mAccessibilityManager.isEnabled();
+    }
+
+    /**
+     * Returns {@code true} if touch exploration is enabled. Currently, this
+     * means that the kill switch is off, the device supports touch exploration,
+     * and system accessibility is turned on.
+     *
+     * @return {@code true} if touch exploration is enabled.
+     */
+    public boolean isTouchExplorationEnabled() {
+        return isAccessibilityEnabled() && mAccessibilityManager.isTouchExplorationEnabled();
+    }
+
+    /**
+     * Returns {@true} if the provided event is a touch exploration (e.g. hover)
+     * event. This is used to determine whether the event should be processed by
+     * the touch exploration code within the keyboard.
+     *
+     * @param event The event to check.
+     * @return {@true} is the event is a touch exploration event
+     */
+    public static boolean isTouchExplorationEvent(final MotionEvent event) {
+        final int action = event.getAction();
+        return action == MotionEvent.ACTION_HOVER_ENTER
+                || action == MotionEvent.ACTION_HOVER_EXIT
+                || action == MotionEvent.ACTION_HOVER_MOVE;
+    }
+
+    /**
+     * Returns whether the device should obscure typed password characters.
+     * Typically this means speaking "dot" in place of non-control characters.
+     *
+     * @return {@code true} if the device should obscure password characters.
+     */
+    @SuppressWarnings("deprecation")
+    public boolean shouldObscureInput(final EditorInfo editorInfo) {
+        if (editorInfo == null) return false;
+
+        // The user can optionally force speaking passwords.
+        if (SettingsSecureCompatUtils.ACCESSIBILITY_SPEAK_PASSWORD != null) {
+            final boolean speakPassword = Settings.Secure.getInt(mContext.getContentResolver(),
+                    SettingsSecureCompatUtils.ACCESSIBILITY_SPEAK_PASSWORD, 0) != 0;
+            if (speakPassword) return false;
+        }
+
+        // Always speak if the user is listening through headphones.
+        if (mAudioManager.isWiredHeadsetOn() || mAudioManager.isBluetoothA2dpOn()) {
+            return false;
+        }
+
+        // Don't speak if the IME is connected to a password field.
+        return InputTypeUtils.isPasswordInputType(editorInfo.inputType);
+    }
+
+    /**
+     * Sets the current auto-correction word and typed word. These may be used
+     * to provide the user with a spoken description of what auto-correction
+     * will occur when a key is typed.
+     *
+     * @param suggestedWords the list of suggested auto-correction words
+     */
+    public void setAutoCorrection(final SuggestedWords suggestedWords) {
+        if (suggestedWords.mWillAutoCorrect) {
+            mAutoCorrectionWord = suggestedWords.getWord(SuggestedWords.INDEX_OF_AUTO_CORRECTION);
+            final SuggestedWords.SuggestedWordInfo typedWordInfo = suggestedWords.mTypedWordInfo;
+            if (null == typedWordInfo) {
+                mTypedWord = null;
+            } else {
+                mTypedWord = typedWordInfo.mWord;
+            }
+        } else {
+            mAutoCorrectionWord = null;
+            mTypedWord = null;
+        }
+    }
+
+    /**
+     * Obtains a description for an auto-correction key, taking into account the
+     * currently typed word and auto-correction.
+     *
+     * @param keyCodeDescription spoken description of the key that will insert
+     *            an auto-correction
+     * @param shouldObscure whether the key should be obscured
+     * @return a description including a description of the auto-correction, if
+     *         needed
+     */
+    public String getAutoCorrectionDescription(
+            final String keyCodeDescription, final boolean shouldObscure) {
+        if (!TextUtils.isEmpty(mAutoCorrectionWord)) {
+            if (!TextUtils.equals(mAutoCorrectionWord, mTypedWord)) {
+                if (shouldObscure) {
+                    // This should never happen, but just in case...
+                    return mContext.getString(R.string.spoken_auto_correct_obscured,
+                            keyCodeDescription);
+                }
+                return mContext.getString(R.string.spoken_auto_correct, keyCodeDescription,
+                        mTypedWord, mAutoCorrectionWord);
+            }
+        }
+
+        return keyCodeDescription;
+    }
+
+    /**
+     * Sends the specified text to the {@link AccessibilityManager} to be
+     * spoken.
+     *
+     * @param view The source view.
+     * @param text The text to speak.
+     */
+    public void announceForAccessibility(final View view, final CharSequence text) {
+        if (!mAccessibilityManager.isEnabled()) {
+            Log.e(TAG, "Attempted to speak when accessibility was disabled!");
+            return;
+        }
+
+        // The following is a hack to avoid using the heavy-weight TextToSpeech
+        // class. Instead, we're just forcing a fake AccessibilityEvent into
+        // the screen reader to make it speak.
+        final AccessibilityEvent event = AccessibilityEvent.obtain();
+
+        event.setPackageName(PACKAGE);
+        event.setClassName(CLASS);
+        event.setEventTime(SystemClock.uptimeMillis());
+        event.setEnabled(true);
+        event.getText().add(text);
+
+        // Platforms starting at SDK version 16 (Build.VERSION_CODES.JELLY_BEAN) should use
+        // announce events.
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
+            event.setEventType(AccessibilityEventCompat.TYPE_ANNOUNCEMENT);
+        } else {
+            event.setEventType(AccessibilityEvent.TYPE_VIEW_FOCUSED);
+        }
+
+        final ViewParent viewParent = view.getParent();
+        if ((viewParent == null) || !(viewParent instanceof ViewGroup)) {
+            Log.e(TAG, "Failed to obtain ViewParent in announceForAccessibility");
+            return;
+        }
+
+        viewParent.requestSendAccessibilityEvent(view, event);
+    }
+
+    /**
+     * Handles speaking the "connect a headset to hear passwords" notification
+     * when connecting to a password field.
+     *
+     * @param view The source view.
+     * @param editorInfo The input connection's editor info attribute.
+     * @param restarting Whether the connection is being restarted.
+     */
+    public void onStartInputViewInternal(final View view, final EditorInfo editorInfo,
+            final boolean restarting) {
+        if (shouldObscureInput(editorInfo)) {
+            final CharSequence text = mContext.getText(R.string.spoken_use_headphones);
+            announceForAccessibility(view, text);
+        }
+    }
+
+    /**
+     * Sends the specified {@link AccessibilityEvent} if accessibility is
+     * enabled. No operation if accessibility is disabled.
+     *
+     * @param event The event to send.
+     */
+    public void requestSendAccessibilityEvent(final AccessibilityEvent event) {
+        if (mAccessibilityManager.isEnabled()) {
+            mAccessibilityManager.sendAccessibilityEvent(event);
+        }
+    }
+}
diff --git a/java/src/org/kelar/inputmethod/accessibility/KeyCodeDescriptionMapper.java b/java/src/org/kelar/inputmethod/accessibility/KeyCodeDescriptionMapper.java
new file mode 100644
index 000000000..972324092
--- /dev/null
+++ b/java/src/org/kelar/inputmethod/accessibility/KeyCodeDescriptionMapper.java
@@ -0,0 +1,365 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.kelar.inputmethod.accessibility;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.text.TextUtils;
+import android.util.Log;
+import android.util.SparseIntArray;
+import android.view.inputmethod.EditorInfo;
+
+import org.kelar.inputmethod.keyboard.Key;
+import org.kelar.inputmethod.keyboard.Keyboard;
+import org.kelar.inputmethod.keyboard.KeyboardId;
+import org.kelar.inputmethod.latin.R;
+import org.kelar.inputmethod.latin.common.Constants;
+import org.kelar.inputmethod.latin.common.StringUtils;
+
+import java.util.Locale;
+
+final class KeyCodeDescriptionMapper {
+    private static final String TAG = KeyCodeDescriptionMapper.class.getSimpleName();
+    private static final String SPOKEN_LETTER_RESOURCE_NAME_FORMAT = "spoken_accented_letter_%04X";
+    private static final String SPOKEN_SYMBOL_RESOURCE_NAME_FORMAT = "spoken_symbol_%04X";
+    private static final String SPOKEN_EMOJI_RESOURCE_NAME_FORMAT = "spoken_emoji_%04X";
+    private static final String SPOKEN_EMOTICON_RESOURCE_NAME_PREFIX = "spoken_emoticon";
+    private static final String SPOKEN_EMOTICON_CODE_POINT_FORMAT = "_%02X";
+
+    // The resource ID of the string spoken for obscured keys
+    private static final int OBSCURED_KEY_RES_ID = R.string.spoken_description_dot;
+
+    private static final KeyCodeDescriptionMapper sInstance = new KeyCodeDescriptionMapper();
+
+    public static KeyCodeDescriptionMapper getInstance() {
+        return sInstance;
+    }
+
+    // Sparse array of spoken description resource IDs indexed by key codes
+    private final SparseIntArray mKeyCodeMap = new SparseIntArray();
+
+    private KeyCodeDescriptionMapper() {
+        // Special non-character codes defined in Keyboard
+        mKeyCodeMap.put(Constants.CODE_SPACE, R.string.spoken_description_space);
+        mKeyCodeMap.put(Constants.CODE_DELETE, R.string.spoken_description_delete);
+        mKeyCodeMap.put(Constants.CODE_ENTER, R.string.spoken_description_return);
+        mKeyCodeMap.put(Constants.CODE_SETTINGS, R.string.spoken_description_settings);
+        mKeyCodeMap.put(Constants.CODE_SHIFT, R.string.spoken_description_shift);
+        mKeyCodeMap.put(Constants.CODE_SHORTCUT, R.string.spoken_description_mic);
+        mKeyCodeMap.put(Constants.CODE_SWITCH_ALPHA_SYMBOL, R.string.spoken_description_to_symbol);
+        mKeyCodeMap.put(Constants.CODE_TAB, R.string.spoken_description_tab);
+        mKeyCodeMap.put(Constants.CODE_LANGUAGE_SWITCH,
+                R.string.spoken_description_language_switch);
+        mKeyCodeMap.put(Constants.CODE_ACTION_NEXT, R.string.spoken_description_action_next);
+        mKeyCodeMap.put(Constants.CODE_ACTION_PREVIOUS,
+                R.string.spoken_description_action_previous);
+        mKeyCodeMap.put(Constants.CODE_EMOJI, R.string.spoken_description_emoji);
+        // Because the upper-case and lower-case mappings of the following letters is depending on
+        // the locale, the upper case descriptions should be defined here. The lower case
+        // descriptions are handled in {@link #getSpokenLetterDescriptionId(Context,int)}.
+        // U+0049: "I" LATIN CAPITAL LETTER I
+        // U+0069: "i" LATIN SMALL LETTER I
+        // U+0130: "İ" LATIN CAPITAL LETTER I WITH DOT ABOVE
+        // U+0131: "ı" LATIN SMALL LETTER DOTLESS I
+        mKeyCodeMap.put(0x0049, R.string.spoken_letter_0049);
+        mKeyCodeMap.put(0x0130, R.string.spoken_letter_0130);
+    }
+
+    /**
+     * Returns the localized description of the action performed by a specified
+     * key based on the current keyboard state.
+     *
+     * @param context The package's context.
+     * @param keyboard The keyboard on which the key resides.
+     * @param key The key from which to obtain a description.
+     * @param shouldObscure {@true} if text (e.g. non-control) characters should be obscured.
+     * @return a character sequence describing the action performed by pressing the key
+     */
+    public String getDescriptionForKey(final Context context, final Keyboard keyboard,
+            final Key key, final boolean shouldObscure) {
+        final int code = key.getCode();
+
+        if (code == Constants.CODE_SWITCH_ALPHA_SYMBOL) {
+            final String description = getDescriptionForSwitchAlphaSymbol(context, keyboard);
+            if (description != null) {
+                return description;
+            }
+        }
+
+        if (code == Constants.CODE_SHIFT) {
+            return getDescriptionForShiftKey(context, keyboard);
+        }
+
+        if (code == Constants.CODE_ENTER) {
+            // The following function returns the correct description in all action and
+            // regular enter cases, taking care of all modes.
+            return getDescriptionForActionKey(context, keyboard, key);
+        }
+
+        if (code == Constants.CODE_OUTPUT_TEXT) {
+            final String outputText = key.getOutputText();
+            final String description = getSpokenEmoticonDescription(context, outputText);
+            return TextUtils.isEmpty(description) ? outputText : description;
+        }
+
+        // Just attempt to speak the description.
+        if (code != Constants.CODE_UNSPECIFIED) {
+            // If the key description should be obscured, now is the time to do it.
+            final boolean isDefinedNonCtrl = Character.isDefined(code)
+                    && !Character.isISOControl(code);
+            if (shouldObscure && isDefinedNonCtrl) {
+                return context.getString(OBSCURED_KEY_RES_ID);
+            }
+            final String description = getDescriptionForCodePoint(context, code);
+            if (description != null) {
+                return description;
+            }
+            if (!TextUtils.isEmpty(key.getLabel())) {
+                return key.getLabel();
+            }
+            return context.getString(R.string.spoken_description_unknown);
+        }
+        return null;
+    }
+
+    /**
+     * Returns a context-specific description for the CODE_SWITCH_ALPHA_SYMBOL
+     * key or {@code null} if there is not a description provided for the
+     * current keyboard context.
+     *
+     * @param context The package's context.
+     * @param keyboard The keyboard on which the key resides.
+     * @return a character sequence describing the action performed by pressing the key
+     */
+    private static String getDescriptionForSwitchAlphaSymbol(final Context context,
+            final Keyboard keyboard) {
+        final KeyboardId keyboardId = keyboard.mId;
+        final int elementId = keyboardId.mElementId;
+        final int resId;
+
+        switch (elementId) {
+        case KeyboardId.ELEMENT_ALPHABET:
+        case KeyboardId.ELEMENT_ALPHABET_AUTOMATIC_SHIFTED:
+        case KeyboardId.ELEMENT_ALPHABET_MANUAL_SHIFTED:
+        case KeyboardId.ELEMENT_ALPHABET_SHIFT_LOCK_SHIFTED:
+        case KeyboardId.ELEMENT_ALPHABET_SHIFT_LOCKED:
+            resId = R.string.spoken_description_to_symbol;
+            break;
+        case KeyboardId.ELEMENT_SYMBOLS:
+        case KeyboardId.ELEMENT_SYMBOLS_SHIFTED:
+            resId = R.string.spoken_description_to_alpha;
+            break;
+        case KeyboardId.ELEMENT_PHONE:
+            resId = R.string.spoken_description_to_symbol;
+            break;
+        case KeyboardId.ELEMENT_PHONE_SYMBOLS:
+            resId = R.string.spoken_description_to_numeric;
+            break;
+        default:
+            Log.e(TAG, "Missing description for keyboard element ID:" + elementId);
+            return null;
+        }
+        return context.getString(resId);
+    }
+
+    /**
+     * Returns a context-sensitive description of the "Shift" key.
+     *
+     * @param context The package's context.
+     * @param keyboard The keyboard on which the key resides.
+     * @return A context-sensitive description of the "Shift" key.
+     */
+    private static String getDescriptionForShiftKey(final Context context,
+            final Keyboard keyboard) {
+        final KeyboardId keyboardId = keyboard.mId;
+        final int elementId = keyboardId.mElementId;
+        final int resId;
+
+        switch (elementId) {
+        case KeyboardId.ELEMENT_ALPHABET_SHIFT_LOCK_SHIFTED:
+        case KeyboardId.ELEMENT_ALPHABET_SHIFT_LOCKED:
+            resId = R.string.spoken_description_caps_lock;
+            break;
+        case KeyboardId.ELEMENT_ALPHABET_AUTOMATIC_SHIFTED:
+        case KeyboardId.ELEMENT_ALPHABET_MANUAL_SHIFTED:
+            resId = R.string.spoken_description_shift_shifted;
+            break;
+        case KeyboardId.ELEMENT_SYMBOLS:
+            resId = R.string.spoken_description_symbols_shift;
+            break;
+        case KeyboardId.ELEMENT_SYMBOLS_SHIFTED:
+            resId = R.string.spoken_description_symbols_shift_shifted;
+            break;
+        default:
+            resId = R.string.spoken_description_shift;
+        }
+        return context.getString(resId);
+    }
+
+    /**
+     * Returns a context-sensitive description of the "Enter" action key.
+     *
+     * @param context The package's context.
+     * @param keyboard The keyboard on which the key resides.
+     * @param key The key to describe.
+     * @return Returns a context-sensitive description of the "Enter" action key.
+     */
+    private static String getDescriptionForActionKey(final Context context, final Keyboard keyboard,
+            final Key key) {
+        final KeyboardId keyboardId = keyboard.mId;
+        final int actionId = keyboardId.imeAction();
+        final int resId;
+
+        // Always use the label, if available.
+        if (!TextUtils.isEmpty(key.getLabel())) {
+            return key.getLabel().trim();
+        }
+
+        // Otherwise, use the action ID.
+        switch (actionId) {
+        case EditorInfo.IME_ACTION_SEARCH:
+            resId = R.string.spoken_description_search;
+            break;
+        case EditorInfo.IME_ACTION_GO:
+            resId = R.string.label_go_key;
+            break;
+        case EditorInfo.IME_ACTION_SEND:
+            resId = R.string.label_send_key;
+            break;
+        case EditorInfo.IME_ACTION_NEXT:
+            resId = R.string.label_next_key;
+            break;
+        case EditorInfo.IME_ACTION_DONE:
+            resId = R.string.label_done_key;
+            break;
+        case EditorInfo.IME_ACTION_PREVIOUS:
+            resId = R.string.label_previous_key;
+            break;
+        default:
+            resId = R.string.spoken_description_return;
+        }
+        return context.getString(resId);
+    }
+
+    /**
+     * Returns a localized character sequence describing what will happen when
+     * the specified key is pressed based on its key code point.
+     *
+     * @param context The package's context.
+     * @param codePoint The code point from which to obtain a description.
+     * @return a character sequence describing the code point.
+     */
+    public String getDescriptionForCodePoint(final Context context, final int codePoint) {
+        // If the key description should be obscured, now is the time to do it.
+        final int index = mKeyCodeMap.indexOfKey(codePoint);
+        if (index >= 0) {
+            return context.getString(mKeyCodeMap.valueAt(index));
+        }
+        final String accentedLetter = getSpokenAccentedLetterDescription(context, codePoint);
+        if (accentedLetter != null) {
+            return accentedLetter;
+        }
+        // Here, <code>code</code> may be a base (non-accented) letter.
+        final String unsupportedSymbol = getSpokenSymbolDescription(context, codePoint);
+        if (unsupportedSymbol != null) {
+            return unsupportedSymbol;
+        }
+        final String emojiDescription = getSpokenEmojiDescription(context, codePoint);
+        if (emojiDescription != null) {
+            return emojiDescription;
+        }
+        if (Character.isDefined(codePoint) && !Character.isISOControl(codePoint)) {
+            return StringUtils.newSingleCodePointString(codePoint);
+        }
+        return null;
+    }
+
+    // TODO: Remove this method once TTS supports those accented letters' verbalization.
+    private String getSpokenAccentedLetterDescription(final Context context, final int code) {
+        final boolean isUpperCase = Character.isUpperCase(code);
+        final int baseCode = isUpperCase ? Character.toLowerCase(code) : code;
+        final int baseIndex = mKeyCodeMap.indexOfKey(baseCode);
+        final int resId = (baseIndex >= 0) ? mKeyCodeMap.valueAt(baseIndex)
+                : getSpokenDescriptionId(context, baseCode, SPOKEN_LETTER_RESOURCE_NAME_FORMAT);
+        if (resId == 0) {
+            return null;
+        }
+        final String spokenText = context.getString(resId);
+        return isUpperCase ? context.getString(R.string.spoken_description_upper_case, spokenText)
+                : spokenText;
+    }
+
+    // TODO: Remove this method once TTS supports those symbols' verbalization.
+    private String getSpokenSymbolDescription(final Context context, final int code) {
+        final int resId = getSpokenDescriptionId(context, code, SPOKEN_SYMBOL_RESOURCE_NAME_FORMAT);
+        if (resId == 0) {
+            return null;
+        }
+        final String spokenText = context.getString(resId);
+        if (!TextUtils.isEmpty(spokenText)) {
+            return spokenText;
+        }
+        // If a translated description is empty, fall back to unknown symbol description.
+        return context.getString(R.string.spoken_symbol_unknown);
+    }
+
+    // TODO: Remove this method once TTS supports emoji verbalization.
+    private String getSpokenEmojiDescription(final Context context, final int code) {
+        final int resId = getSpokenDescriptionId(context, code, SPOKEN_EMOJI_RESOURCE_NAME_FORMAT);
+        if (resId == 0) {
+            return null;
+        }
+        final String spokenText = context.getString(resId);
+        if (!TextUtils.isEmpty(spokenText)) {
+            return spokenText;
+        }
+        // If a translated description is empty, fall back to unknown emoji description.
+        return context.getString(R.string.spoken_emoji_unknown);
+    }
+
+    private int getSpokenDescriptionId(final Context context, final int code,
+            final String resourceNameFormat) {
+        final String resourceName = String.format(Locale.ROOT, resourceNameFormat, code);
+        final Resources resources = context.getResources();
+        // Note that the resource package name may differ from the context package name.
+        final String resourcePackageName = resources.getResourcePackageName(
+                R.string.spoken_description_unknown);
+        final int resId = resources.getIdentifier(resourceName, "string", resourcePackageName);
+        if (resId != 0) {
+            mKeyCodeMap.append(code, resId);
+        }
+        return resId;
+    }
+
+    // TODO: Remove this method once TTS supports emoticon verbalization.
+    private static String getSpokenEmoticonDescription(final Context context,
+            final String outputText) {
+        final StringBuilder sb = new StringBuilder(SPOKEN_EMOTICON_RESOURCE_NAME_PREFIX);
+        final int textLength = outputText.length();
+        for (int index = 0; index < textLength; index = outputText.offsetByCodePoints(index, 1)) {
+            final int codePoint = outputText.codePointAt(index);
+            sb.append(String.format(Locale.ROOT, SPOKEN_EMOTICON_CODE_POINT_FORMAT, codePoint));
+        }
+        final String resourceName = sb.toString();
+        final Resources resources = context.getResources();
+        // Note that the resource package name may differ from the context package name.
+        final String resourcePackageName = resources.getResourcePackageName(
+                R.string.spoken_description_unknown);
+        final int resId = resources.getIdentifier(resourceName, "string", resourcePackageName);
+        return (resId == 0) ? null : resources.getString(resId);
+    }
+}
diff --git a/java/src/org/kelar/inputmethod/accessibility/KeyboardAccessibilityDelegate.java b/java/src/org/kelar/inputmethod/accessibility/KeyboardAccessibilityDelegate.java
new file mode 100644
index 000000000..9e6275d56
--- /dev/null
+++ b/java/src/org/kelar/inputmethod/accessibility/KeyboardAccessibilityDelegate.java
@@ -0,0 +1,326 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.kelar.inputmethod.accessibility;
+
+import android.content.Context;
+import android.os.SystemClock;
+import androidx.core.view.AccessibilityDelegateCompat;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
+import android.util.Log;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewParent;
+import android.view.accessibility.AccessibilityEvent;
+
+import org.kelar.inputmethod.keyboard.Key;
+import org.kelar.inputmethod.keyboard.KeyDetector;
+import org.kelar.inputmethod.keyboard.Keyboard;
+import org.kelar.inputmethod.keyboard.KeyboardView;
+
+/**
+ * This class represents a delegate that can be registered in a class that extends
+ * {@link KeyboardView} to enhance accessibility support via composition rather via inheritance.
+ *
+ * To implement accessibility mode, the target keyboard view has to:<p>
+ * - Call {@link #setKeyboard(Keyboard)} when a new keyboard is set to the keyboard view.
+ * - Dispatch a hover event by calling {@link #onHoverEnter(MotionEvent)}.
+ *
+ * @param <KV> The keyboard view class type.
+ */
+public class KeyboardAccessibilityDelegate<KV extends KeyboardView>
+        extends AccessibilityDelegateCompat {
+    private static final String TAG = KeyboardAccessibilityDelegate.class.getSimpleName();
+    protected static final boolean DEBUG_HOVER = false;
+
+    protected final KV mKeyboardView;
+    protected final KeyDetector mKeyDetector;
+    private Keyboard mKeyboard;
+    private KeyboardAccessibilityNodeProvider<KV> mAccessibilityNodeProvider;
+    private Key mLastHoverKey;
+
+    public static final int HOVER_EVENT_POINTER_ID = 0;
+
+    public KeyboardAccessibilityDelegate(final KV keyboardView, final KeyDetector keyDetector) {
+        super();
+        mKeyboardView = keyboardView;
+        mKeyDetector = keyDetector;
+
+        // Ensure that the view has an accessibility delegate.
+        ViewCompat.setAccessibilityDelegate(keyboardView, this);
+    }
+
+    /**
+     * Called when the keyboard layout changes.
+     * <p>
+     * <b>Note:</b> This method will be called even if accessibility is not
+     * enabled.
+     * @param keyboard The keyboard that is being set to the wrapping view.
+     */
+    public void setKeyboard(final Keyboard keyboard) {
+        if (keyboard == null) {
+            return;
+        }
+        if (mAccessibilityNodeProvider != null) {
+            mAccessibilityNodeProvider.setKeyboard(keyboard);
+        }
+        mKeyboard = keyboard;
+    }
+
+    protected final Keyboard getKeyboard() {
+        return mKeyboard;
+    }
+
+    protected final void setLastHoverKey(final Key key) {
+        mLastHoverKey = key;
+    }
+
+    protected final Key getLastHoverKey() {
+        return mLastHoverKey;
+    }
+
+    /**
+     * Sends a window state change event with the specified string resource id.
+     *
+     * @param resId The string resource id of the text to send with the event.
+     */
+    protected void sendWindowStateChanged(final int resId) {
+        if (resId == 0) {
+            return;
+        }
+        final Context context = mKeyboardView.getContext();
+        sendWindowStateChanged(context.getString(resId));
+    }
+
+    /**
+     * Sends a window state change event with the specified text.
+     *
+     * @param text The text to send with the event.
+     */
+    protected void sendWindowStateChanged(final String text) {
+        final AccessibilityEvent stateChange = AccessibilityEvent.obtain(
+                AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
+        mKeyboardView.onInitializeAccessibilityEvent(stateChange);
+        stateChange.getText().add(text);
+        stateChange.setContentDescription(null);
+
+        final ViewParent parent = mKeyboardView.getParent();
+        if (parent != null) {
+            parent.requestSendAccessibilityEvent(mKeyboardView, stateChange);
+        }
+    }
+
+    /**
+     * Delegate method for View.getAccessibilityNodeProvider(). This method is called in SDK
+     * version 15 (Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) and higher to obtain the virtual
+     * node hierarchy provider.
+     *
+     * @param host The host view for the provider.
+     * @return The accessibility node provider for the current keyboard.
+     */
+    @Override
+    public KeyboardAccessibilityNodeProvider<KV> getAccessibilityNodeProvider(final View host) {
+        return getAccessibilityNodeProvider();
+    }
+
+    /**
+     * @return A lazily-instantiated node provider for this view delegate.
+     */
+    protected KeyboardAccessibilityNodeProvider<KV> getAccessibilityNodeProvider() {
+        // Instantiate the provide only when requested. Since the system
+        // will call this method multiple times it is a good practice to
+        // cache the provider instance.
+        if (mAccessibilityNodeProvider == null) {
+            mAccessibilityNodeProvider =
+                    new KeyboardAccessibilityNodeProvider<>(mKeyboardView, this);
+        }
+        return mAccessibilityNodeProvider;
+    }
+
+    /**
+     * Get a key that a hover event is on.
+     *
+     * @param event The hover event.
+     * @return key The key that the <code>event</code> is on.
+     */
+    protected final Key getHoverKeyOf(final MotionEvent event) {
+        final int actionIndex = event.getActionIndex();
+        final int x = (int)event.getX(actionIndex);
+        final int y = (int)event.getY(actionIndex);
+        return mKeyDetector.detectHitKey(x, y);
+    }
+
+    /**
+     * Receives hover events when touch exploration is turned on in SDK versions ICS and higher.
+     *
+     * @param event The hover event.
+     * @return {@code true} if the event is handled.
+     */
+    public boolean onHoverEvent(final MotionEvent event) {
+        switch (event.getActionMasked()) {
+        case MotionEvent.ACTION_HOVER_ENTER:
+            onHoverEnter(event);
+            break;
+        case MotionEvent.ACTION_HOVER_MOVE:
+            onHoverMove(event);
+            break;
+        case MotionEvent.ACTION_HOVER_EXIT:
+            onHoverExit(event);
+            break;
+        default:
+            Log.w(getClass().getSimpleName(), "Unknown hover event: " + event);
+            break;
+        }
+        return true;
+    }
+
+    /**
+     * Process {@link MotionEvent#ACTION_HOVER_ENTER} event.
+     *
+     * @param event A hover enter event.
+     */
+    protected void onHoverEnter(final MotionEvent event) {
+        final Key key = getHoverKeyOf(event);
+        if (DEBUG_HOVER) {
+            Log.d(TAG, "onHoverEnter: key=" + key);
+        }
+        if (key != null) {
+            onHoverEnterTo(key);
+        }
+        setLastHoverKey(key);
+    }
+
+    /**
+     * Process {@link MotionEvent#ACTION_HOVER_MOVE} event.
+     *
+     * @param event A hover move event.
+     */
+    protected void onHoverMove(final MotionEvent event) {
+        final Key lastKey = getLastHoverKey();
+        final Key key = getHoverKeyOf(event);
+        if (key != lastKey) {
+            if (lastKey != null) {
+                onHoverExitFrom(lastKey);
+            }
+            if (key != null) {
+                onHoverEnterTo(key);
+            }
+        }
+        if (key != null) {
+            onHoverMoveWithin(key);
+        }
+        setLastHoverKey(key);
+    }
+
+    /**
+     * Process {@link MotionEvent#ACTION_HOVER_EXIT} event.
+     *
+     * @param event A hover exit event.
+     */
+    protected void onHoverExit(final MotionEvent event) {
+        final Key lastKey = getLastHoverKey();
+        if (DEBUG_HOVER) {
+            Log.d(TAG, "onHoverExit: key=" + getHoverKeyOf(event) + " last=" + lastKey);
+        }
+        if (lastKey != null) {
+            onHoverExitFrom(lastKey);
+        }
+        final Key key = getHoverKeyOf(event);
+        // Make sure we're not getting an EXIT event because the user slid
+        // off the keyboard area, then force a key press.
+        if (key != null) {
+            onHoverExitFrom(key);
+        }
+        setLastHoverKey(null);
+    }
+
+    /**
+     * Perform click on a key.
+     *
+     * @param key A key to be registered.
+     */
+    public void performClickOn(final Key key) {
+        if (DEBUG_HOVER) {
+            Log.d(TAG, "performClickOn: key=" + key);
+        }
+        simulateTouchEvent(MotionEvent.ACTION_DOWN, key);
+        simulateTouchEvent(MotionEvent.ACTION_UP, key);
+    }
+
+    /**
+     * Simulating a touch event by injecting a synthesized touch event into {@link KeyboardView}.
+     *
+     * @param touchAction The action of the synthesizing touch event.
+     * @param key The key that a synthesized touch event is on.
+     */
+    private void simulateTouchEvent(final int touchAction, final Key key) {
+        final int x = key.getHitBox().centerX();
+        final int y = key.getHitBox().centerY();
+        final long eventTime = SystemClock.uptimeMillis();
+        final MotionEvent touchEvent = MotionEvent.obtain(
+                eventTime, eventTime, touchAction, x, y, 0 /* metaState */);
+        mKeyboardView.onTouchEvent(touchEvent);
+        touchEvent.recycle();
+    }
+
+    /**
+     * Handles a hover enter event on a key.
+     *
+     * @param key The currently hovered key.
+     */
+    protected void onHoverEnterTo(final Key key) {
+        if (DEBUG_HOVER) {
+            Log.d(TAG, "onHoverEnterTo: key=" + key);
+        }
+        key.onPressed();
+        mKeyboardView.invalidateKey(key);
+        final KeyboardAccessibilityNodeProvider<KV> provider = getAccessibilityNodeProvider();
+        provider.onHoverEnterTo(key);
+        provider.performActionForKey(key, AccessibilityNodeInfoCompat.ACTION_ACCESSIBILITY_FOCUS);
+    }
+
+    /**
+     * Handles a hover move event on a key.
+     *
+     * @param key The currently hovered key.
+     */
+    protected void onHoverMoveWithin(final Key key) { }
+
+    /**
+     * Handles a hover exit event on a key.
+     *
+     * @param key The currently hovered key.
+     */
+    protected void onHoverExitFrom(final Key key) {
+        if (DEBUG_HOVER) {
+            Log.d(TAG, "onHoverExitFrom: key=" + key);
+        }
+        key.onReleased();
+        mKeyboardView.invalidateKey(key);
+        final KeyboardAccessibilityNodeProvider<KV> provider = getAccessibilityNodeProvider();
+        provider.onHoverExitFrom(key);
+    }
+
+    /**
+     * Perform long click on a key.
+     *
+     * @param key A key to be long pressed on.
+     */
+    public void performLongClickOn(final Key key) {
+        // A extended class should override this method to implement long press.
+    }
+}
diff --git a/java/src/org/kelar/inputmethod/accessibility/KeyboardAccessibilityNodeProvider.java b/java/src/org/kelar/inputmethod/accessibility/KeyboardAccessibilityNodeProvider.java
new file mode 100644
index 000000000..b50835eee
--- /dev/null
+++ b/java/src/org/kelar/inputmethod/accessibility/KeyboardAccessibilityNodeProvider.java
@@ -0,0 +1,339 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.kelar.inputmethod.accessibility;
+
+import android.graphics.Rect;
+import android.os.Bundle;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.accessibility.AccessibilityEventCompat;
+import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
+import androidx.core.view.accessibility.AccessibilityNodeProviderCompat;
+import androidx.core.view.accessibility.AccessibilityRecordCompat;
+import android.util.Log;
+import android.view.View;
+import android.view.accessibility.AccessibilityEvent;
+import android.view.inputmethod.EditorInfo;
+
+import org.kelar.inputmethod.keyboard.Key;
+import org.kelar.inputmethod.keyboard.Keyboard;
+import org.kelar.inputmethod.keyboard.KeyboardView;
+import org.kelar.inputmethod.latin.common.CoordinateUtils;
+import org.kelar.inputmethod.latin.settings.Settings;
+import org.kelar.inputmethod.latin.settings.SettingsValues;
+
+import java.util.List;
+
+/**
+ * Exposes a virtual view sub-tree for {@link KeyboardView} and generates
+ * {@link AccessibilityEvent}s for individual {@link Key}s.
+ * <p>
+ * A virtual sub-tree is composed of imaginary {@link View}s that are reported
+ * as a part of the view hierarchy for accessibility purposes. This enables
+ * custom views that draw complex content to report them selves as a tree of
+ * virtual views, thus conveying their logical structure.
+ * </p>
+ */
+final class KeyboardAccessibilityNodeProvider<KV extends KeyboardView>
+        extends AccessibilityNodeProviderCompat {
+    private static final String TAG = KeyboardAccessibilityNodeProvider.class.getSimpleName();
+
+    // From {@link android.view.accessibility.AccessibilityNodeInfo#UNDEFINED_ITEM_ID}.
+    private static final int UNDEFINED = Integer.MAX_VALUE;
+
+    private final KeyCodeDescriptionMapper mKeyCodeDescriptionMapper;
+    private final AccessibilityUtils mAccessibilityUtils;
+
+    /** Temporary rect used to calculate in-screen bounds. */
+    private final Rect mTempBoundsInScreen = new Rect();
+
+    /** The parent view's cached on-screen location. */
+    private final int[] mParentLocation = CoordinateUtils.newInstance();
+
+    /** The virtual view identifier for the focused node. */
+    private int mAccessibilityFocusedView = UNDEFINED;
+
+    /** The virtual view identifier for the hovering node. */
+    private int mHoveringNodeId = UNDEFINED;
+
+    /** The keyboard view to provide an accessibility node info. */
+    private final KV mKeyboardView;
+    /** The accessibility delegate. */
+    private final KeyboardAccessibilityDelegate<KV> mDelegate;
+
+    /** The current keyboard. */
+    private Keyboard mKeyboard;
+
+    public KeyboardAccessibilityNodeProvider(final KV keyboardView,
+            final KeyboardAccessibilityDelegate<KV> delegate) {
+        super();
+        mKeyCodeDescriptionMapper = KeyCodeDescriptionMapper.getInstance();
+        mAccessibilityUtils = AccessibilityUtils.getInstance();
+        mKeyboardView = keyboardView;
+        mDelegate = delegate;
+
+        // Since this class is constructed lazily, we might not get a subsequent
+        // call to setKeyboard() and therefore need to call it now.
+        setKeyboard(keyboardView.getKeyboard());
+    }
+
+    /**
+     * Sets the keyboard represented by this node provider.
+     *
+     * @param keyboard The keyboard that is being set to the keyboard view.
+     */
+    public void setKeyboard(final Keyboard keyboard) {
+        mKeyboard = keyboard;
+    }
+
+    private Key getKeyOf(final int virtualViewId) {
+        if (mKeyboard == null) {
+            return null;
+        }
+        final List<Key> sortedKeys = mKeyboard.getSortedKeys();
+        // Use a virtual view id as an index of the sorted keys list.
+        if (virtualViewId >= 0 && virtualViewId < sortedKeys.size()) {
+            return sortedKeys.get(virtualViewId);
+        }
+        return null;
+    }
+
+    private int getVirtualViewIdOf(final Key key) {
+        if (mKeyboard == null) {
+            return View.NO_ID;
+        }
+        final List<Key> sortedKeys = mKeyboard.getSortedKeys();
+        final int size = sortedKeys.size();
+        for (int index = 0; index < size; index++) {
+            if (sortedKeys.get(index) == key) {
+                // Use an index of the sorted keys list as a virtual view id.
+                return index;
+            }
+        }
+        return View.NO_ID;
+    }
+
+    /**
+     * Creates and populates an {@link AccessibilityEvent} for the specified key
+     * and event type.
+     *
+     * @param key A key on the host keyboard view.
+     * @param eventType The event type to create.
+     * @return A populated {@link AccessibilityEvent} for the key.
+     * @see AccessibilityEvent
+     */
+    public AccessibilityEvent createAccessibilityEvent(final Key key, final int eventType) {
+        final int virtualViewId = getVirtualViewIdOf(key);
+        final String keyDescription = getKeyDescription(key);
+        final AccessibilityEvent event = AccessibilityEvent.obtain(eventType);
+        event.setPackageName(mKeyboardView.getContext().getPackageName());
+        event.setClassName(key.getClass().getName());
+        event.setContentDescription(keyDescription);
+        event.setEnabled(true);
+        final AccessibilityRecordCompat record = AccessibilityEventCompat.asRecord(event);
+        record.setSource(mKeyboardView, virtualViewId);
+        return event;
+    }
+
+    public void onHoverEnterTo(final Key key) {
+        final int id = getVirtualViewIdOf(key);
+        if (id == View.NO_ID) {
+            return;
+        }
+        // Start hovering on the key. Because our accessibility model is lift-to-type, we should
+        // report the node info without click and long click actions to avoid unnecessary
+        // announcements.
+        mHoveringNodeId = id;
+        // Invalidate the node info of the key.
+        sendAccessibilityEventForKey(key, AccessibilityEventCompat.TYPE_WINDOW_CONTENT_CHANGED);
+        sendAccessibilityEventForKey(key, AccessibilityEventCompat.TYPE_VIEW_HOVER_ENTER);
+    }
+
+    public void onHoverExitFrom(final Key key) {
+        mHoveringNodeId = UNDEFINED;
+        // Invalidate the node info of the key to be able to revert the change we have done
+        // in {@link #onHoverEnterTo(Key)}.
+        sendAccessibilityEventForKey(key, AccessibilityEventCompat.TYPE_WINDOW_CONTENT_CHANGED);
+        sendAccessibilityEventForKey(key, AccessibilityEventCompat.TYPE_VIEW_HOVER_EXIT);
+    }
+
+    /**
+     * Returns an {@link AccessibilityNodeInfoCompat} representing a virtual
+     * view, i.e. a descendant of the host View, with the given <code>virtualViewId</code> or
+     * the host View itself if <code>virtualViewId</code> equals to {@link View#NO_ID}.
+     * <p>
+     * A virtual descendant is an imaginary View that is reported as a part of
+     * the view hierarchy for accessibility purposes. This enables custom views
+     * that draw complex content to report them selves as a tree of virtual
+     * views, thus conveying their logical structure.
+     * </p>
+     * <p>
+     * The implementer is responsible for obtaining an accessibility node info
+     * from the pool of reusable instances and setting the desired properties of
+     * the node info before returning it.
+     * </p>
+     *
+     * @param virtualViewId A client defined virtual view id.
+     * @return A populated {@link AccessibilityNodeInfoCompat} for a virtual descendant or the host
+     * View.
+     * @see AccessibilityNodeInfoCompat
+     */
+    @Override
+    public AccessibilityNodeInfoCompat createAccessibilityNodeInfo(final int virtualViewId) {
+        if (virtualViewId == UNDEFINED) {
+            return null;
+        }
+        if (virtualViewId == View.NO_ID) {
+            // We are requested to create an AccessibilityNodeInfo describing
+            // this View, i.e. the root of the virtual sub-tree.
+            final AccessibilityNodeInfoCompat rootInfo =
+                    AccessibilityNodeInfoCompat.obtain(mKeyboardView);
+            ViewCompat.onInitializeAccessibilityNodeInfo(mKeyboardView, rootInfo);
+            updateParentLocation();
+
+            // Add the virtual children of the root View.
+            final List<Key> sortedKeys = mKeyboard.getSortedKeys();
+            final int size = sortedKeys.size();
+            for (int index = 0; index < size; index++) {
+                final Key key = sortedKeys.get(index);
+                if (key.isSpacer()) {
+                    continue;
+                }
+                // Use an index of the sorted keys list as a virtual view id.
+                rootInfo.addChild(mKeyboardView, index);
+            }
+            return rootInfo;
+        }
+
+        // Find the key that corresponds to the given virtual view id.
+        final Key key = getKeyOf(virtualViewId);
+        if (key == null) {
+            Log.e(TAG, "Invalid virtual view ID: " + virtualViewId);
+            return null;
+        }
+        final String keyDescription = getKeyDescription(key);
+        final Rect boundsInParent = key.getHitBox();
+
+        // Calculate the key's in-screen bounds.
+        mTempBoundsInScreen.set(boundsInParent);
+        mTempBoundsInScreen.offset(
+                CoordinateUtils.x(mParentLocation), CoordinateUtils.y(mParentLocation));
+        final Rect boundsInScreen = mTempBoundsInScreen;
+
+        // Obtain and initialize an AccessibilityNodeInfo with information about the virtual view.
+        final AccessibilityNodeInfoCompat info = AccessibilityNodeInfoCompat.obtain();
+        info.setPackageName(mKeyboardView.getContext().getPackageName());
+        // info.setTextEntryKey(true);
+        info.setClassName(key.getClass().getName());
+        info.setContentDescription(keyDescription);
+        info.setBoundsInParent(boundsInParent);
+        info.setBoundsInScreen(boundsInScreen);
+        info.setParent(mKeyboardView);
+        info.setSource(mKeyboardView, virtualViewId);
+        info.setEnabled(key.isEnabled());
+        info.setVisibleToUser(true);
+        info.addAction(AccessibilityNodeInfoCompat.ACTION_CLICK);
+        if (key.isLongPressEnabled()) {
+            info.addAction(AccessibilityNodeInfoCompat.ACTION_LONG_CLICK);
+        }
+
+        if (mAccessibilityFocusedView == virtualViewId) {
+            info.addAction(AccessibilityNodeInfoCompat.ACTION_CLEAR_ACCESSIBILITY_FOCUS);
+        } else {
+            info.addAction(AccessibilityNodeInfoCompat.ACTION_ACCESSIBILITY_FOCUS);
+        }
+        return info;
+    }
+
+    @Override
+    public boolean performAction(final int virtualViewId, final int action,
+            final Bundle arguments) {
+        final Key key = getKeyOf(virtualViewId);
+        if (key == null) {
+            return false;
+        }
+        return performActionForKey(key, action);
+    }
+
+    /**
+     * Performs the specified accessibility action for the given key.
+     *
+     * @param key The on which to perform the action.
+     * @param action The action to perform.
+     * @return The result of performing the action, or false if the action is not supported.
+     */
+    boolean performActionForKey(final Key key, final int action) {
+        switch (action) {
+        case AccessibilityNodeInfoCompat.ACTION_ACCESSIBILITY_FOCUS:
+            mAccessibilityFocusedView = getVirtualViewIdOf(key);
+            sendAccessibilityEventForKey(
+                    key, AccessibilityEventCompat.TYPE_VIEW_ACCESSIBILITY_FOCUSED);
+            return true;
+        case AccessibilityNodeInfoCompat.ACTION_CLEAR_ACCESSIBILITY_FOCUS:
+            mAccessibilityFocusedView = UNDEFINED;
+            sendAccessibilityEventForKey(
+                    key, AccessibilityEventCompat.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED);
+            return true;
+        case AccessibilityNodeInfoCompat.ACTION_CLICK:
+            sendAccessibilityEventForKey(key, AccessibilityEvent.TYPE_VIEW_CLICKED);
+            mDelegate.performClickOn(key);
+            return true;
+        case AccessibilityNodeInfoCompat.ACTION_LONG_CLICK:
+            sendAccessibilityEventForKey(key, AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
+            mDelegate.performLongClickOn(key);
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    /**
+     * Sends an accessibility event for the given {@link Key}.
+     *
+     * @param key The key that's sending the event.
+     * @param eventType The type of event to send.
+     */
+    void sendAccessibilityEventForKey(final Key key, final int eventType) {
+        final AccessibilityEvent event = createAccessibilityEvent(key, eventType);
+        mAccessibilityUtils.requestSendAccessibilityEvent(event);
+    }
+
+    /**
+     * Returns the context-specific description for a {@link Key}.
+     *
+     * @param key The key to describe.
+     * @return The context-specific description of the key.
+     */
+    private String getKeyDescription(final Key key) {
+        final EditorInfo editorInfo = mKeyboard.mId.mEditorInfo;
+        final boolean shouldObscure = mAccessibilityUtils.shouldObscureInput(editorInfo);
+        final SettingsValues currentSettings = Settings.getInstance().getCurrent();
+        final String keyCodeDescription = mKeyCodeDescriptionMapper.getDescriptionForKey(
+                mKeyboardView.getContext(), mKeyboard, key, shouldObscure);
+        if (currentSettings.isWordSeparator(key.getCode())) {
+            return mAccessibilityUtils.getAutoCorrectionDescription(
+                    keyCodeDescription, shouldObscure);
+        }
+        return keyCodeDescription;
+    }
+
+    /**
+     * Updates the parent's on-screen location.
+     */
+    private void updateParentLocation() {
+        mKeyboardView.getLocationOnScreen(mParentLocation);
+    }
+}
diff --git a/java/src/org/kelar/inputmethod/accessibility/MainKeyboardAccessibilityDelegate.java b/java/src/org/kelar/inputmethod/accessibility/MainKeyboardAccessibilityDelegate.java
new file mode 100644
index 000000000..0275162b6
--- /dev/null
+++ b/java/src/org/kelar/inputmethod/accessibility/MainKeyboardAccessibilityDelegate.java
@@ -0,0 +1,293 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.kelar.inputmethod.accessibility;
+
+import android.content.Context;
+import android.graphics.Rect;
+import android.os.SystemClock;
+import android.util.Log;
+import android.util.SparseIntArray;
+import android.view.MotionEvent;
+
+import org.kelar.inputmethod.keyboard.Key;
+import org.kelar.inputmethod.keyboard.KeyDetector;
+import org.kelar.inputmethod.keyboard.Keyboard;
+import org.kelar.inputmethod.keyboard.KeyboardId;
+import org.kelar.inputmethod.keyboard.MainKeyboardView;
+import org.kelar.inputmethod.keyboard.PointerTracker;
+import org.kelar.inputmethod.latin.R;
+import org.kelar.inputmethod.latin.utils.SubtypeLocaleUtils;
+
+/**
+ * This class represents a delegate that can be registered in {@link MainKeyboardView} to enhance
+ * accessibility support via composition rather via inheritance.
+ */
+public final class MainKeyboardAccessibilityDelegate
+        extends KeyboardAccessibilityDelegate<MainKeyboardView>
+        implements AccessibilityLongPressTimer.LongPressTimerCallback {
+    private static final String TAG = MainKeyboardAccessibilityDelegate.class.getSimpleName();
+
+    /** Map of keyboard modes to resource IDs. */
+    private static final SparseIntArray KEYBOARD_MODE_RES_IDS = new SparseIntArray();
+
+    static {
+        KEYBOARD_MODE_RES_IDS.put(KeyboardId.MODE_DATE, R.string.keyboard_mode_date);
+        KEYBOARD_MODE_RES_IDS.put(KeyboardId.MODE_DATETIME, R.string.keyboard_mode_date_time);
+        KEYBOARD_MODE_RES_IDS.put(KeyboardId.MODE_EMAIL, R.string.keyboard_mode_email);
+        KEYBOARD_MODE_RES_IDS.put(KeyboardId.MODE_IM, R.string.keyboard_mode_im);
+        KEYBOARD_MODE_RES_IDS.put(KeyboardId.MODE_NUMBER, R.string.keyboard_mode_number);
+        KEYBOARD_MODE_RES_IDS.put(KeyboardId.MODE_PHONE, R.string.keyboard_mode_phone);
+        KEYBOARD_MODE_RES_IDS.put(KeyboardId.MODE_TEXT, R.string.keyboard_mode_text);
+        KEYBOARD_MODE_RES_IDS.put(KeyboardId.MODE_TIME, R.string.keyboard_mode_time);
+        KEYBOARD_MODE_RES_IDS.put(KeyboardId.MODE_URL, R.string.keyboard_mode_url);
+    }
+
+    /** The most recently set keyboard mode. */
+    private int mLastKeyboardMode = KEYBOARD_IS_HIDDEN;
+    private static final int KEYBOARD_IS_HIDDEN = -1;
+    // The rectangle region to ignore hover events.
+    private final Rect mBoundsToIgnoreHoverEvent = new Rect();
+
+
+    public MainKeyboardAccessibilityDelegate(final MainKeyboardView mainKeyboardView,
+            final KeyDetector keyDetector) {
+        super(mainKeyboardView, keyDetector);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void setKeyboard(final Keyboard keyboard) {
+        if (keyboard == null) {
+            return;
+        }
+        final Keyboard lastKeyboard = getKeyboard();
+        super.setKeyboard(keyboard);
+        final int lastKeyboardMode = mLastKeyboardMode;
+        mLastKeyboardMode = keyboard.mId.mMode;
+
+        // Since this method is called even when accessibility is off, make sure
+        // to check the state before announcing anything.
+        if (!AccessibilityUtils.getInstance().isAccessibilityEnabled()) {
+            return;
+        }
+        // Announce the language name only when the language is changed.
+        if (lastKeyboard == null || !keyboard.mId.mSubtype.equals(lastKeyboard.mId.mSubtype)) {
+            announceKeyboardLanguage(keyboard);
+            return;
+        }
+        // Announce the mode only when the mode is changed.
+        if (keyboard.mId.mMode != lastKeyboardMode) {
+            announceKeyboardMode(keyboard);
+            return;
+        }
+        // Announce the keyboard type only when the type is changed.
+        if (keyboard.mId.mElementId != lastKeyboard.mId.mElementId) {
+            announceKeyboardType(keyboard, lastKeyboard);
+            return;
+        }
+    }
+
+    /**
+     * Called when the keyboard is hidden and accessibility is enabled.
+     */
+    public void onHideWindow() {
+        if (mLastKeyboardMode != KEYBOARD_IS_HIDDEN) {
+            announceKeyboardHidden();
+        }
+        mLastKeyboardMode = KEYBOARD_IS_HIDDEN;
+    }
+
+    /**
+     * Announces which language of keyboard is being displayed.
+     *
+     * @param keyboard The new keyboard.
+     */
+    private void announceKeyboardLanguage(final Keyboard keyboard) {
+        final String languageText = SubtypeLocaleUtils.getSubtypeDisplayNameInSystemLocale(
+                keyboard.mId.mSubtype.getRawSubtype());
+        sendWindowStateChanged(languageText);
+    }
+
+    /**
+     * Announces which type of keyboard is being displayed.
+     * If the keyboard type is unknown, no announcement is made.
+     *
+     * @param keyboard The new keyboard.
+     */
+    private void announceKeyboardMode(final Keyboard keyboard) {
+        final Context context = mKeyboardView.getContext();
+        final int modeTextResId = KEYBOARD_MODE_RES_IDS.get(keyboard.mId.mMode);
+        if (modeTextResId == 0) {
+            return;
+        }
+        final String modeText = context.getString(modeTextResId);
+        final String text = context.getString(R.string.announce_keyboard_mode, modeText);
+        sendWindowStateChanged(text);
+    }
+
+    /**
+     * Announces which type of keyboard is being displayed.
+     *
+     * @param keyboard The new keyboard.
+     * @param lastKeyboard The last keyboard.
+     */
+    private void announceKeyboardType(final Keyboard keyboard, final Keyboard lastKeyboard) {
+        final int lastElementId = lastKeyboard.mId.mElementId;
+        final int resId;
+        switch (keyboard.mId.mElementId) {
+        case KeyboardId.ELEMENT_ALPHABET_AUTOMATIC_SHIFTED:
+        case KeyboardId.ELEMENT_ALPHABET:
+            if (lastElementId == KeyboardId.ELEMENT_ALPHABET
+                    || lastElementId == KeyboardId.ELEMENT_ALPHABET_AUTOMATIC_SHIFTED) {
+                // Transition between alphabet mode and automatic shifted mode should be silently
+                // ignored because it can be determined by each key's talk back announce.
+                return;
+            }
+            resId = R.string.spoken_description_mode_alpha;
+            break;
+        case KeyboardId.ELEMENT_ALPHABET_MANUAL_SHIFTED:
+            if (lastElementId == KeyboardId.ELEMENT_ALPHABET_AUTOMATIC_SHIFTED) {
+                // Resetting automatic shifted mode by pressing the shift key causes the transition
+                // from automatic shifted to manual shifted that should be silently ignored.
+                return;
+            }
+            resId = R.string.spoken_description_shiftmode_on;
+            break;
+        case KeyboardId.ELEMENT_ALPHABET_SHIFT_LOCK_SHIFTED:
+            if (lastElementId == KeyboardId.ELEMENT_ALPHABET_SHIFT_LOCKED) {
+                // Resetting caps locked mode by pressing the shift key causes the transition
+                // from shift locked to shift lock shifted that should be silently ignored.
+                return;
+            }
+            resId = R.string.spoken_description_shiftmode_locked;
+            break;
+        case KeyboardId.ELEMENT_ALPHABET_SHIFT_LOCKED:
+            resId = R.string.spoken_description_shiftmode_locked;
+            break;
+        case KeyboardId.ELEMENT_SYMBOLS:
+            resId = R.string.spoken_description_mode_symbol;
+            break;
+        case KeyboardId.ELEMENT_SYMBOLS_SHIFTED:
+            resId = R.string.spoken_description_mode_symbol_shift;
+            break;
+        case KeyboardId.ELEMENT_PHONE:
+            resId = R.string.spoken_description_mode_phone;
+            break;
+        case KeyboardId.ELEMENT_PHONE_SYMBOLS:
+            resId = R.string.spoken_description_mode_phone_shift;
+            break;
+        default:
+            return;
+        }
+        sendWindowStateChanged(resId);
+    }
+
+    /**
+     * Announces that the keyboard has been hidden.
+     */
+    private void announceKeyboardHidden() {
+        sendWindowStateChanged(R.string.announce_keyboard_hidden);
+    }
+
+    @Override
+    public void performClickOn(final Key key) {
+        final int x = key.getHitBox().centerX();
+        final int y = key.getHitBox().centerY();
+        if (DEBUG_HOVER) {
+            Log.d(TAG, "performClickOn: key=" + key
+                    + " inIgnoreBounds=" + mBoundsToIgnoreHoverEvent.contains(x, y));
+        }
+        if (mBoundsToIgnoreHoverEvent.contains(x, y)) {
+            // This hover exit event points to the key that should be ignored.
+            // Clear the ignoring region to handle further hover events.
+            mBoundsToIgnoreHoverEvent.setEmpty();
+            return;
+        }
+        super.performClickOn(key);
+    }
+
+    @Override
+    protected void onHoverEnterTo(final Key key) {
+        final int x = key.getHitBox().centerX();
+        final int y = key.getHitBox().centerY();
+        if (DEBUG_HOVER) {
+            Log.d(TAG, "onHoverEnterTo: key=" + key
+                    + " inIgnoreBounds=" + mBoundsToIgnoreHoverEvent.contains(x, y));
+        }
+        if (mBoundsToIgnoreHoverEvent.contains(x, y)) {
+            return;
+        }
+        // This hover enter event points to the key that isn't in the ignoring region.
+        // Further hover events should be handled.
+        mBoundsToIgnoreHoverEvent.setEmpty();
+        super.onHoverEnterTo(key);
+    }
+
+    @Override
+    protected void onHoverExitFrom(final Key key) {
+        final int x = key.getHitBox().centerX();
+        final int y = key.getHitBox().centerY();
+        if (DEBUG_HOVER) {
+            Log.d(TAG, "onHoverExitFrom: key=" + key
+                    + " inIgnoreBounds=" + mBoundsToIgnoreHoverEvent.contains(x, y));
+        }
+        super.onHoverExitFrom(key);
+    }
+
+    @Override
+    public void performLongClickOn(final Key key) {
+        if (DEBUG_HOVER) {
+            Log.d(TAG, "performLongClickOn: key=" + key);
+        }
+        final PointerTracker tracker = PointerTracker.getPointerTracker(HOVER_EVENT_POINTER_ID);
+        final long eventTime = SystemClock.uptimeMillis();
+        final int x = key.getHitBox().centerX();
+        final int y = key.getHitBox().centerY();
+        final MotionEvent downEvent = MotionEvent.obtain(
+                eventTime, eventTime, MotionEvent.ACTION_DOWN, x, y, 0 /* metaState */);
+        // Inject a fake down event to {@link PointerTracker} to handle a long press correctly.
+        tracker.processMotionEvent(downEvent, mKeyDetector);
+        downEvent.recycle();
+        // Invoke {@link PointerTracker#onLongPressed()} as if a long press timeout has passed.
+        tracker.onLongPressed();
+        // If {@link Key#hasNoPanelAutoMoreKeys()} is true (such as "0 +" key on the phone layout)
+        // or a key invokes IME switcher dialog, we should just ignore the next
+        // {@link #onRegisterHoverKey(Key,MotionEvent)}. It can be determined by whether
+        // {@link PointerTracker} is in operation or not.
+        if (tracker.isInOperation()) {
+            // This long press shows a more keys keyboard and further hover events should be
+            // handled.
+            mBoundsToIgnoreHoverEvent.setEmpty();
+            return;
+        }
+        // This long press has handled at {@link MainKeyboardView#onLongPress(PointerTracker)}.
+        // We should ignore further hover events on this key.
+        mBoundsToIgnoreHoverEvent.set(key.getHitBox());
+        if (key.hasNoPanelAutoMoreKey()) {
+            // This long press has registered a code point without showing a more keys keyboard.
+            // We should talk back the code point if possible.
+            final int codePointOfNoPanelAutoMoreKey = key.getMoreKeys()[0].mCode;
+            final String text = KeyCodeDescriptionMapper.getInstance().getDescriptionForCodePoint(
+                    mKeyboardView.getContext(), codePointOfNoPanelAutoMoreKey);
+            if (text != null) {
+                sendWindowStateChanged(text);
+            }
+        }
+    }
+}
diff --git a/java/src/org/kelar/inputmethod/accessibility/MoreKeysKeyboardAccessibilityDelegate.java b/java/src/org/kelar/inputmethod/accessibility/MoreKeysKeyboardAccessibilityDelegate.java
new file mode 100644
index 000000000..b0a6f8bed
--- /dev/null
+++ b/java/src/org/kelar/inputmethod/accessibility/MoreKeysKeyboardAccessibilityDelegate.java
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.kelar.inputmethod.accessibility;
+
+import android.graphics.Rect;
+import android.util.Log;
+import android.view.MotionEvent;
+
+import org.kelar.inputmethod.keyboard.Key;
+import org.kelar.inputmethod.keyboard.KeyDetector;
+import org.kelar.inputmethod.keyboard.MoreKeysKeyboardView;
+import org.kelar.inputmethod.keyboard.PointerTracker;
+
+/**
+ * This class represents a delegate that can be registered in {@link MoreKeysKeyboardView} to
+ * enhance accessibility support via composition rather via inheritance.
+ */
+public class MoreKeysKeyboardAccessibilityDelegate
+        extends KeyboardAccessibilityDelegate<MoreKeysKeyboardView> {
+    private static final String TAG = MoreKeysKeyboardAccessibilityDelegate.class.getSimpleName();
+
+    private final Rect mMoreKeysKeyboardValidBounds = new Rect();
+    private static final int CLOSING_INSET_IN_PIXEL = 1;
+    private int mOpenAnnounceResId;
+    private int mCloseAnnounceResId;
+
+    public MoreKeysKeyboardAccessibilityDelegate(final MoreKeysKeyboardView moreKeysKeyboardView,
+            final KeyDetector keyDetector) {
+        super(moreKeysKeyboardView, keyDetector);
+    }
+
+    public void setOpenAnnounce(final int resId) {
+        mOpenAnnounceResId = resId;
+    }
+
+    public void setCloseAnnounce(final int resId) {
+        mCloseAnnounceResId = resId;
+    }
+
+    public void onShowMoreKeysKeyboard() {
+        sendWindowStateChanged(mOpenAnnounceResId);
+    }
+
+    public void onDismissMoreKeysKeyboard() {
+        sendWindowStateChanged(mCloseAnnounceResId);
+    }
+
+    @Override
+    protected void onHoverEnter(final MotionEvent event) {
+        if (DEBUG_HOVER) {
+            Log.d(TAG, "onHoverEnter: key=" + getHoverKeyOf(event));
+        }
+        super.onHoverEnter(event);
+        final int actionIndex = event.getActionIndex();
+        final int x = (int)event.getX(actionIndex);
+        final int y = (int)event.getY(actionIndex);
+        final int pointerId = event.getPointerId(actionIndex);
+        final long eventTime = event.getEventTime();
+        mKeyboardView.onDownEvent(x, y, pointerId, eventTime);
+    }
+
+    @Override
+    protected void onHoverMove(final MotionEvent event) {
+        super.onHoverMove(event);
+        final int actionIndex = event.getActionIndex();
+        final int x = (int)event.getX(actionIndex);
+        final int y = (int)event.getY(actionIndex);
+        final int pointerId = event.getPointerId(actionIndex);
+        final long eventTime = event.getEventTime();
+        mKeyboardView.onMoveEvent(x, y, pointerId, eventTime);
+    }
+
+    @Override
+    protected void onHoverExit(final MotionEvent event) {
+        final Key lastKey = getLastHoverKey();
+        if (DEBUG_HOVER) {
+            Log.d(TAG, "onHoverExit: key=" + getHoverKeyOf(event) + " last=" + lastKey);
+        }
+        if (lastKey != null) {
+            super.onHoverExitFrom(lastKey);
+        }
+        setLastHoverKey(null);
+        final int actionIndex = event.getActionIndex();
+        final int x = (int)event.getX(actionIndex);
+        final int y = (int)event.getY(actionIndex);
+        final int pointerId = event.getPointerId(actionIndex);
+        final long eventTime = event.getEventTime();
+        // A hover exit event at one pixel width or height area on the edges of more keys keyboard
+        // are treated as closing.
+        mMoreKeysKeyboardValidBounds.set(0, 0, mKeyboardView.getWidth(), mKeyboardView.getHeight());
+        mMoreKeysKeyboardValidBounds.inset(CLOSING_INSET_IN_PIXEL, CLOSING_INSET_IN_PIXEL);
+        if (mMoreKeysKeyboardValidBounds.contains(x, y)) {
+            // Invoke {@link MoreKeysKeyboardView#onUpEvent(int,int,int,long)} as if this hover
+            // exit event selects a key.
+            mKeyboardView.onUpEvent(x, y, pointerId, eventTime);
+            // TODO: Should fix this reference. This is a hack to clear the state of
+            // {@link PointerTracker}.
+            PointerTracker.dismissAllMoreKeysPanels();
+            return;
+        }
+        // Close the more keys keyboard.
+        // TODO: Should fix this reference. This is a hack to clear the state of
+        // {@link PointerTracker}.
+        PointerTracker.dismissAllMoreKeysPanels();
+    }
+}