Add different ways of reading the dictionary file.

This change adds basic support for an external dictionary provider.
It adds methods for reading the dictionary itself from an asset in
the dictionary provider package directly, obtaining the file name
through the ContentProvider interface; it also adds a way of getting
the data through an InputStream and copying the file locally.

Incidentally this change also adds the code needed to listen for
updating the dictionary provider package and reloading it in time.

This change also goes hand-in-hand with Iab31db6e, which implements
the small closed part of this.

Issue: 3414944

Change-Id: I5e4fff99a59bb99dbdb002102db6c90e6cb41c8a

1 files changed, 33 insertions, 7 deletions

diff --git a/java/src/com/android/inputmethod/latin/LatinIME.java b/java/src/com/android/inputmethod/latin/LatinIME.java
index 3d1b4e031..e5beb2c4e 100644
--- a/java/src/com/android/inputmethod/latin/LatinIME.java
+++ b/java/src/com/android/inputmethod/latin/LatinIME.java
@@ -119,6 +119,12 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
     // Key events coming any faster than this are long-presses.
     private static final int QUICK_PRESS = 200;
 
+    /**
+     * The name of the scheme used by the Package Manager to warn of a new package installation,
+     * replacement or removal.
+     */
+    private static final String SCHEME_PACKAGE = "package";
+
     private int mSuggestionVisibility;
     private static final int SUGGESTION_VISIBILILTY_SHOW_VALUE
             = R.string.prefs_suggestion_visibility_show_value;
@@ -207,6 +213,10 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
     // TODO: Move this flag to VoiceIMEConnector
     private boolean mConfigurationChanging;
 
+    // Object for reacting to adding/removing a dictionary pack.
+    private BroadcastReceiver mDictionaryPackInstallReceiver =
+            new DictionaryPackInstallBroadcastReceiver(this);
+
     // Keeps track of most recently inserted text (multi-character key) for reverting
     private CharSequence mEnteredText;
 
@@ -414,18 +424,26 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
         mOrientation = res.getConfiguration().orientation;
         initSuggestPuncList();
 
-        // register to receive ringer mode change and network state change.
+        // Register to receive ringer mode change and network state change.
+        // Also receive installation and removal of a dictionary pack.
         final IntentFilter filter = new IntentFilter();
         filter.addAction(AudioManager.RINGER_MODE_CHANGED_ACTION);
         filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
         registerReceiver(mReceiver, filter);
         mVoiceConnector = VoiceConnector.init(this, prefs, mHandler);
+
+        final IntentFilter packageFilter = new IntentFilter();
+        packageFilter.addAction(Intent.ACTION_PACKAGE_ADDED);
+        packageFilter.addAction(Intent.ACTION_PACKAGE_REMOVED);
+        packageFilter.addDataScheme(SCHEME_PACKAGE);
+        registerReceiver(mDictionaryPackInstallReceiver, packageFilter);
     }
 
     private void initSuggest() {
-        String locale = mSubtypeSwitcher.getInputLocaleStr();
+        final String localeStr = mSubtypeSwitcher.getInputLocaleStr();
+        final Locale keyboardLocale = new Locale(localeStr);
 
-        Locale savedLocale = mSubtypeSwitcher.changeSystemLocale(new Locale(locale));
+        final Locale savedLocale = mSubtypeSwitcher.changeSystemLocale(keyboardLocale);
         if (mSuggest != null) {
             mSuggest.close();
         }
@@ -434,20 +452,20 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
 
         final Resources res = mResources;
         int mainDicResId = Utils.getMainDictionaryResourceId(res);
-        mSuggest = new Suggest(this, mainDicResId);
+        mSuggest = new Suggest(this, mainDicResId, keyboardLocale);
         loadAndSetAutoCorrectionThreshold(prefs);
         updateAutoTextEnabled();
 
-        mUserDictionary = new UserDictionary(this, locale);
+        mUserDictionary = new UserDictionary(this, localeStr);
         mSuggest.setUserDictionary(mUserDictionary);
 
         mContactsDictionary = new ContactsDictionary(this, Suggest.DIC_CONTACTS);
         mSuggest.setContactsDictionary(mContactsDictionary);
 
-        mAutoDictionary = new AutoDictionary(this, this, locale, Suggest.DIC_AUTO);
+        mAutoDictionary = new AutoDictionary(this, this, localeStr, Suggest.DIC_AUTO);
         mSuggest.setAutoDictionary(mAutoDictionary);
 
-        mUserBigramDictionary = new UserBigramDictionary(this, this, locale, Suggest.DIC_USER);
+        mUserBigramDictionary = new UserBigramDictionary(this, this, localeStr, Suggest.DIC_USER);
         mSuggest.setUserBigramDictionary(mUserBigramDictionary);
 
         updateCorrectionMode();
@@ -457,6 +475,13 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
         mSubtypeSwitcher.changeSystemLocale(savedLocale);
     }
 
+    /* package private */ void resetSuggestMainDict() {
+        final String localeStr = mSubtypeSwitcher.getInputLocaleStr();
+        final Locale keyboardLocale = new Locale(localeStr);
+        int mainDicResId = Utils.getMainDictionaryResourceId(mResources);
+        mSuggest.resetMainDict(this, mainDicResId, keyboardLocale);
+    }
+
     @Override
     public void onDestroy() {
         if (mSuggest != null) {
@@ -464,6 +489,7 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
             mSuggest = null;
         }
         unregisterReceiver(mReceiver);
+        unregisterReceiver(mDictionaryPackInstallReceiver);
         mVoiceConnector.destroy();
         LatinImeLogger.commit();
         LatinImeLogger.onDestroy();