| /* |
| * 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 com.android.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. |
| } |
| } |