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/*
* 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.latin.settings;
import android.app.backup.BackupManager;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.content.res.Resources;
import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceFragment;
import android.preference.PreferenceScreen;
import android.util.Log;
/**
* A base abstract class for a {@link PreferenceFragment} that implements a nested
* {@link PreferenceScreen} of the main preference screen.
*/
public abstract class SubScreenFragment extends PreferenceFragment
implements OnSharedPreferenceChangeListener {
private OnSharedPreferenceChangeListener mSharedPreferenceChangeListener;
static void setPreferenceEnabled(final String prefKey, final boolean enabled,
final PreferenceScreen screen) {
final Preference preference = screen.findPreference(prefKey);
if (preference != null) {
preference.setEnabled(enabled);
}
}
static void removePreference(final String prefKey, final PreferenceScreen screen) {
final Preference preference = screen.findPreference(prefKey);
if (preference != null) {
screen.removePreference(preference);
}
}
static void updateListPreferenceSummaryToCurrentValue(final String prefKey,
final PreferenceScreen screen) {
// Because the "%s" summary trick of {@link ListPreference} doesn't work properly before
// KitKat, we need to update the summary programmatically.
final ListPreference listPreference = (ListPreference)screen.findPreference(prefKey);
if (listPreference == null) {
return;
}
final CharSequence entries[] = listPreference.getEntries();
final int entryIndex = listPreference.findIndexOfValue(listPreference.getValue());
listPreference.setSummary(entryIndex < 0 ? null : entries[entryIndex]);
}
final void setPreferenceEnabled(final String prefKey, final boolean enabled) {
setPreferenceEnabled(prefKey, enabled, getPreferenceScreen());
}
final void removePreference(final String prefKey) {
removePreference(prefKey, getPreferenceScreen());
}
final void updateListPreferenceSummaryToCurrentValue(final String prefKey) {
updateListPreferenceSummaryToCurrentValue(prefKey, getPreferenceScreen());
}
final SharedPreferences getSharedPreferences() {
return getPreferenceManager().getSharedPreferences();
}
/**
* Gets the application name to display on the UI.
*/
final String getApplicationName() {
final Context context = getActivity();
final Resources res = getResources();
final int applicationLabelRes = context.getApplicationInfo().labelRes;
return res.getString(applicationLabelRes);
}
@Override
public void addPreferencesFromResource(final int preferencesResId) {
super.addPreferencesFromResource(preferencesResId);
TwoStatePreferenceHelper.replaceCheckBoxPreferencesBySwitchPreferences(
getPreferenceScreen());
}
@Override
public void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mSharedPreferenceChangeListener = new OnSharedPreferenceChangeListener() {
@Override
public void onSharedPreferenceChanged(final SharedPreferences prefs, final String key) {
final SubScreenFragment fragment = SubScreenFragment.this;
final Context context = fragment.getActivity();
if (context == null || fragment.getPreferenceScreen() == null) {
final String tag = fragment.getClass().getSimpleName();
// TODO: Introduce a static function to register this class and ensure that
// onCreate must be called before "onSharedPreferenceChanged" is called.
Log.w(tag, "onSharedPreferenceChanged called before activity starts.");
return;
}
new BackupManager(context).dataChanged();
fragment.onSharedPreferenceChanged(prefs, key);
}
};
getSharedPreferences().registerOnSharedPreferenceChangeListener(
mSharedPreferenceChangeListener);
}
@Override
public void onDestroy() {
getSharedPreferences().unregisterOnSharedPreferenceChangeListener(
mSharedPreferenceChangeListener);
super.onDestroy();
}
@Override
public void onSharedPreferenceChanged(final SharedPreferences prefs, final String key) {
// This method may be overridden by an extended class.
}
}
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