Settings/src/com/android/tv/settings/system/TtsEngineSettingsFragment.java - platform/packages/apps/TvSettings - Git at Google

 /*
  * Copyright (C) 2015 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.tv.settings.system;

 import static com.android.tv.settings.util.InstrumentationUtils.logEntrySelected;

 import android.app.tvsettings.TvSettingsEnums;
 import android.content.ActivityNotFoundException;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.Bundle;
 import android.speech.tts.TextToSpeech;
 import android.speech.tts.TtsEngines;
 import android.text.TextUtils;
 import android.util.Log;
 import android.util.Pair;

 import androidx.annotation.Keep;
 import androidx.annotation.NonNull;
 import androidx.preference.ListPreference;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceScreen;

 import com.android.tv.settings.R;
 import com.android.tv.settings.SettingsPreferenceFragment;

 import java.util.ArrayList;
 import java.util.Locale;

 /**
  * The text-to-speech engine settings screen in TV Settings.
  */
 @Keep
 public class TtsEngineSettingsFragment extends SettingsPreferenceFragment implements
         Preference.OnPreferenceClickListener, Preference.OnPreferenceChangeListener {
     private static final String TAG = "TtsEngineSettings";
     private static final boolean DBG = false;

     /**
      * Key for the name of the TTS engine passed in to the engine
      * settings fragment {@link TtsEngineSettingsFragment}.
      */
     private static final String ARG_ENGINE_NAME = "engineName";

     /**
      * Key for the label of the TTS engine passed in to the engine
      * settings fragment. This is used as the title of the fragment
      * {@link TtsEngineSettingsFragment}.
      */
     private static final String ARG_ENGINE_LABEL = "engineLabel";

     /**
      * Key for the voice data data passed in to the engine settings
      * fragmetn {@link TtsEngineSettingsFragment}.
      */
     private static final String ARG_VOICES = "voices";


     private static final String KEY_ENGINE_LOCALE = "tts_default_lang";
     private static final String KEY_ENGINE_SETTINGS = "tts_engine_settings";
     private static final String KEY_INSTALL_DATA = "tts_install_data";

     private static final String STATE_KEY_LOCALE_ENTRIES = "locale_entries";
     private static final String STATE_KEY_LOCALE_ENTRY_VALUES= "locale_entry_values";
     private static final String STATE_KEY_LOCALE_VALUE = "locale_value";

     private static final int VOICE_DATA_INTEGRITY_CHECK = 1977;

     private TtsEngines mEnginesHelper;
     private ListPreference mLocalePreference;
     private Preference mEngineSettingsPreference;
     private Preference mInstallVoicesPreference;
     private Intent mVoiceDataDetails;

     private TextToSpeech mTts;

     private int mSelectedLocaleIndex = -1;

     private final TextToSpeech.OnInitListener mTtsInitListener = new TextToSpeech.OnInitListener() {
         @Override
         public void onInit(int status) {
             if (status != TextToSpeech.SUCCESS) {
                 getFragmentManager().popBackStack();
             } else {
                 getActivity().runOnUiThread(new Runnable() {
                     @Override
                     public void run() {
                         mLocalePreference.setEnabled(true);
                     }
                 });
             }
         }
     };

     private final BroadcastReceiver mLanguagesChangedReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
             // Installed or uninstalled some data packs
             if (TextToSpeech.Engine.ACTION_TTS_DATA_INSTALLED.equals(intent.getAction())) {
                 checkTtsData();
             }
         }
     };

     public static void prepareArgs(@NonNull Bundle args, String engineName, String engineLabel,
             Intent voiceCheckData) {
         args.clear();

         args.putString(ARG_ENGINE_NAME, engineName);
         args.putString(ARG_ENGINE_LABEL, engineLabel);
         args.putParcelable(ARG_VOICES, voiceCheckData);
     }

     public TtsEngineSettingsFragment() {}

     @Override
     public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {

         addPreferencesFromResource(R.xml.tts_engine_settings);

         final PreferenceScreen screen = getPreferenceScreen();
         screen.setTitle(getEngineLabel());
         screen.setKey(getEngineName());

         mLocalePreference = (ListPreference) findPreference(KEY_ENGINE_LOCALE);
         mLocalePreference.setOnPreferenceChangeListener(this);
         mEngineSettingsPreference = findPreference(KEY_ENGINE_SETTINGS);
         mEngineSettingsPreference.setOnPreferenceClickListener(this);
         mInstallVoicesPreference = findPreference(KEY_INSTALL_DATA);
         mInstallVoicesPreference.setOnPreferenceClickListener(this);

         mEngineSettingsPreference.setTitle(getResources().getString(
                 R.string.tts_engine_settings_title, getEngineLabel()));
         final Intent settingsIntent = mEnginesHelper.getSettingsIntent(getEngineName());
         mEngineSettingsPreference.setIntent(settingsIntent);
         if (settingsIntent == null) {
             mEngineSettingsPreference.setEnabled(false);
         }
         mInstallVoicesPreference.setEnabled(false);

         if (savedInstanceState == null) {
             mLocalePreference.setEnabled(false);
             mLocalePreference.setEntries(new CharSequence[0]);
             mLocalePreference.setEntryValues(new CharSequence[0]);
         } else {
             // Repopulate mLocalePreference with saved state. Will be updated later with
             // up-to-date values when checkTtsData() calls back with results.
             final CharSequence[] entries =
                     savedInstanceState.getCharSequenceArray(STATE_KEY_LOCALE_ENTRIES);
             final CharSequence[] entryValues =
                     savedInstanceState.getCharSequenceArray(STATE_KEY_LOCALE_ENTRY_VALUES);
             final CharSequence value =
                     savedInstanceState.getCharSequence(STATE_KEY_LOCALE_VALUE);

             mLocalePreference.setEntries(entries);
             mLocalePreference.setEntryValues(entryValues);
             mLocalePreference.setValue(value != null ? value.toString() : null);
             mLocalePreference.setEnabled(entries.length > 0);
         }

     }

     @Override
     public void onCreate(Bundle savedInstanceState) {
         mEnginesHelper = new TtsEngines(getActivity());

         super.onCreate(savedInstanceState);

         mVoiceDataDetails = getArguments().getParcelable(ARG_VOICES);

         mTts = new TextToSpeech(getActivity().getApplicationContext(), mTtsInitListener,
                 getEngineName());

         // Check if data packs changed
         checkTtsData();

         getActivity().registerReceiver(mLanguagesChangedReceiver,
                 new IntentFilter(TextToSpeech.Engine.ACTION_TTS_DATA_INSTALLED),
                 Context.RECEIVER_EXPORTED_UNAUDITED);
     }

     @Override
     public void onDestroy() {
         getActivity().unregisterReceiver(mLanguagesChangedReceiver);
         mTts.shutdown();
         super.onDestroy();
     }

     @Override
     public void onSaveInstanceState(Bundle outState) {
         super.onSaveInstanceState(outState);

         // Save the mLocalePreference values, so we can repopulate it with entries.
         outState.putCharSequenceArray(STATE_KEY_LOCALE_ENTRIES,
                 mLocalePreference.getEntries());
         outState.putCharSequenceArray(STATE_KEY_LOCALE_ENTRY_VALUES,
                 mLocalePreference.getEntryValues());
         outState.putCharSequence(STATE_KEY_LOCALE_VALUE,
                 mLocalePreference.getValue());
     }

     private void checkTtsData() {
         Intent intent = new Intent(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
         intent.setPackage(getEngineName());
         try {
             if (DBG) Log.d(TAG, "Updating engine: Checking voice data: " + intent.toUri(0));
             startActivityForResult(intent, VOICE_DATA_INTEGRITY_CHECK);
         } catch (ActivityNotFoundException ex) {
             Log.e(TAG, "Failed to check TTS data, no activity found for " + intent + ")");
         }
     }

     @Override
     public void onActivityResult(int requestCode, int resultCode, Intent data) {
         if (requestCode == VOICE_DATA_INTEGRITY_CHECK) {
             if (resultCode != TextToSpeech.Engine.CHECK_VOICE_DATA_FAIL) {
                 updateVoiceDetails(data);
             } else {
                 Log.e(TAG, "CheckVoiceData activity failed");
             }
         }
     }

     private void updateVoiceDetails(Intent data) {
         if (data == null){
             Log.e(TAG, "Engine failed voice data integrity check (null return)" +
                     mTts.getCurrentEngine());
             return;
         }
         mVoiceDataDetails = data;

         if (DBG) Log.d(TAG, "Parsing voice data details, data: " + mVoiceDataDetails.toUri(0));

         final ArrayList<String> available = mVoiceDataDetails.getStringArrayListExtra(
                 TextToSpeech.Engine.EXTRA_AVAILABLE_VOICES);
         final ArrayList<String> unavailable = mVoiceDataDetails.getStringArrayListExtra(
                 TextToSpeech.Engine.EXTRA_UNAVAILABLE_VOICES);

         if (unavailable != null && unavailable.size() > 0) {
             mInstallVoicesPreference.setEnabled(true);
         } else {
             mInstallVoicesPreference.setEnabled(false);
         }

         if (available == null){
             Log.e(TAG, "TTS data check failed (available == null).");
             mLocalePreference.setEnabled(false);
         } else {
             updateDefaultLocalePref(available);
         }
     }

     private void updateDefaultLocalePref(ArrayList<String> availableLangs) {
         if (availableLangs == null || availableLangs.size() == 0) {
             mLocalePreference.setEnabled(false);
             return;
         }
         Locale currentLocale = null;
         if (!mEnginesHelper.isLocaleSetToDefaultForEngine(getEngineName())) {
             currentLocale = mEnginesHelper.getLocalePrefForEngine(getEngineName());
         }

         ArrayList<Pair<String, Locale>> entryPairs =
                 new ArrayList<>(availableLangs.size());
         for (int i = 0; i < availableLangs.size(); i++) {
             Locale locale = mEnginesHelper.parseLocaleString(availableLangs.get(i));
             if (locale != null){
                 entryPairs.add(new Pair<>(locale.getDisplayName(), locale));
             }
         }

         // Sort it
         entryPairs.sort((lhs, rhs) -> lhs.first.compareToIgnoreCase(rhs.first));

         // Get two arrays out of one of pairs
         mSelectedLocaleIndex = 0; // Will point to the R.string.tts_lang_use_system value
         CharSequence[] entries = new CharSequence[availableLangs.size()+1];
         CharSequence[] entryValues = new CharSequence[availableLangs.size()+1];

         entries[0] = getString(R.string.tts_lang_use_system);
         entryValues[0] = "";

         int i = 1;
         for (Pair<String, Locale> entry : entryPairs) {
             if (entry.second.equals(currentLocale)) {
                 mSelectedLocaleIndex = i;
             }
             entries[i] = entry.first;
             entryValues[i++] = entry.second.toString();
         }

         mLocalePreference.setEntries(entries);
         mLocalePreference.setEntryValues(entryValues);
         mLocalePreference.setEnabled(true);
         setLocalePreference(mSelectedLocaleIndex);
     }

     /** Set entry from entry table in mLocalePreference */
     private void setLocalePreference(int index) {
         if (index < 0) {
             mLocalePreference.setValue("");
             mLocalePreference.setSummary(R.string.tts_lang_not_selected);
         } else {
             mLocalePreference.setValueIndex(index);
             mLocalePreference.setSummary(mLocalePreference.getEntries()[index]);
         }
     }

     /**
      * Ask the current default engine to launch the matching INSTALL_TTS_DATA activity
      * so the required TTS files are properly installed.
      */
     private void installVoiceData() {
         if (TextUtils.isEmpty(getEngineName())) return;
         Intent intent = new Intent(TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);
         intent.setPackage(getEngineName());
         try {
             startActivity(intent);
         } catch (ActivityNotFoundException ex) {
             Log.e(TAG, "Failed to install TTS data, no activity found for " + intent + ")");
         }
     }

     @Override
     public boolean onPreferenceClick(Preference preference) {
         if (preference == mInstallVoicesPreference) {
             logEntrySelected(TvSettingsEnums.SYSTEM_A11Y_TTS_ENGINE_CONFIG_INSTALL_VOICE_DATA);
             installVoiceData();
             return true;
         } else if (preference == mEngineSettingsPreference) {
             logEntrySelected(TvSettingsEnums.SYSTEM_A11Y_TTS_ENGINE_CONFIG_SETTINGS_GTTS_ENGINE);
             return false;
         }

         return false;
     }

     @Override
     public boolean onPreferenceChange(Preference preference, Object newValue) {
         if (preference == mLocalePreference) {
             logEntrySelected(
                     TvSettingsEnums.SYSTEM_A11Y_TTS_ENGINE_CONFIG_LANGUAGE_CHOOSE_LANGUAGE);
             String localeString = (String) newValue;
             updateLanguageTo((!TextUtils.isEmpty(localeString) ?
                     mEnginesHelper.parseLocaleString(localeString) : null));
             return true;
         }
         return false;
     }

     private void updateLanguageTo(Locale locale) {
         int selectedLocaleIndex = -1;
         String localeString = (locale != null) ? locale.toString() : "";
         for (int i=0; i < mLocalePreference.getEntryValues().length; i++) {
             if (localeString.equalsIgnoreCase(mLocalePreference.getEntryValues()[i].toString())) {
                 selectedLocaleIndex = i;
                 break;
             }
         }

         if (selectedLocaleIndex == -1) {
             Log.w(TAG, "updateLanguageTo called with unknown locale argument");
             return;
         }
         mLocalePreference.setSummary(mLocalePreference.getEntries()[selectedLocaleIndex]);
         mSelectedLocaleIndex = selectedLocaleIndex;

         mEnginesHelper.updateLocalePrefForEngine(getEngineName(), locale);

         if (getEngineName().equals(mTts.getCurrentEngine())) {
             // Null locale means "use system default"
             mTts.setLanguage((locale != null) ? locale : Locale.getDefault());
         }
     }

     private String getEngineName() {
         return getArguments().getString(ARG_ENGINE_NAME, "");
     }

     private String getEngineLabel() {
         return getArguments().getString(ARG_ENGINE_LABEL, "");
     }

     @Override
     protected int getPageId() {
         return TvSettingsEnums.SYSTEM_A11Y_TTS_ENGINE_CONFIG;
     }
 }
	/*
	* Copyright (C) 2015 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.tv.settings.system;

	import static com.android.tv.settings.util.InstrumentationUtils.logEntrySelected;

	import android.app.tvsettings.TvSettingsEnums;
	import android.content.ActivityNotFoundException;
	import android.content.BroadcastReceiver;
	import android.content.Context;
	import android.content.Intent;
	import android.content.IntentFilter;
	import android.os.Bundle;
	import android.speech.tts.TextToSpeech;
	import android.speech.tts.TtsEngines;
	import android.text.TextUtils;
	import android.util.Log;
	import android.util.Pair;

	import androidx.annotation.Keep;
	import androidx.annotation.NonNull;
	import androidx.preference.ListPreference;
	import androidx.preference.Preference;
	import androidx.preference.PreferenceScreen;

	import com.android.tv.settings.R;
	import com.android.tv.settings.SettingsPreferenceFragment;

	import java.util.ArrayList;
	import java.util.Locale;

	/**
	* The text-to-speech engine settings screen in TV Settings.
	*/
	@Keep
	public class TtsEngineSettingsFragment extends SettingsPreferenceFragment implements
	Preference.OnPreferenceClickListener, Preference.OnPreferenceChangeListener {
	private static final String TAG = "TtsEngineSettings";
	private static final boolean DBG = false;

	/**
	* Key for the name of the TTS engine passed in to the engine
	* settings fragment {@link TtsEngineSettingsFragment}.
	*/
	private static final String ARG_ENGINE_NAME = "engineName";

	/**
	* Key for the label of the TTS engine passed in to the engine
	* settings fragment. This is used as the title of the fragment
	* {@link TtsEngineSettingsFragment}.
	*/
	private static final String ARG_ENGINE_LABEL = "engineLabel";

	/**
	* Key for the voice data data passed in to the engine settings
	* fragmetn {@link TtsEngineSettingsFragment}.
	*/
	private static final String ARG_VOICES = "voices";


	private static final String KEY_ENGINE_LOCALE = "tts_default_lang";
	private static final String KEY_ENGINE_SETTINGS = "tts_engine_settings";
	private static final String KEY_INSTALL_DATA = "tts_install_data";

	private static final String STATE_KEY_LOCALE_ENTRIES = "locale_entries";
	private static final String STATE_KEY_LOCALE_ENTRY_VALUES= "locale_entry_values";
	private static final String STATE_KEY_LOCALE_VALUE = "locale_value";

	private static final int VOICE_DATA_INTEGRITY_CHECK = 1977;

	private TtsEngines mEnginesHelper;
	private ListPreference mLocalePreference;
	private Preference mEngineSettingsPreference;
	private Preference mInstallVoicesPreference;
	private Intent mVoiceDataDetails;

	private TextToSpeech mTts;

	private int mSelectedLocaleIndex = -1;

	private final TextToSpeech.OnInitListener mTtsInitListener = new TextToSpeech.OnInitListener() {
	@Override
	public void onInit(int status) {
	if (status != TextToSpeech.SUCCESS) {
	getFragmentManager().popBackStack();
	} else {
	getActivity().runOnUiThread(new Runnable() {
	@Override
	public void run() {
	mLocalePreference.setEnabled(true);
	}
	});
	}
	}
	};

	private final BroadcastReceiver mLanguagesChangedReceiver = new BroadcastReceiver() {
	@Override
	public void onReceive(Context context, Intent intent) {
	// Installed or uninstalled some data packs
	if (TextToSpeech.Engine.ACTION_TTS_DATA_INSTALLED.equals(intent.getAction())) {
	checkTtsData();
	}
	}
	};

	public static void prepareArgs(@NonNull Bundle args, String engineName, String engineLabel,
	Intent voiceCheckData) {
	args.clear();

	args.putString(ARG_ENGINE_NAME, engineName);
	args.putString(ARG_ENGINE_LABEL, engineLabel);
	args.putParcelable(ARG_VOICES, voiceCheckData);
	}

	public TtsEngineSettingsFragment() {}

	@Override
	public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {

	addPreferencesFromResource(R.xml.tts_engine_settings);

	final PreferenceScreen screen = getPreferenceScreen();
	screen.setTitle(getEngineLabel());
	screen.setKey(getEngineName());

	mLocalePreference = (ListPreference) findPreference(KEY_ENGINE_LOCALE);
	mLocalePreference.setOnPreferenceChangeListener(this);
	mEngineSettingsPreference = findPreference(KEY_ENGINE_SETTINGS);
	mEngineSettingsPreference.setOnPreferenceClickListener(this);
	mInstallVoicesPreference = findPreference(KEY_INSTALL_DATA);
	mInstallVoicesPreference.setOnPreferenceClickListener(this);

	mEngineSettingsPreference.setTitle(getResources().getString(
	R.string.tts_engine_settings_title, getEngineLabel()));
	final Intent settingsIntent = mEnginesHelper.getSettingsIntent(getEngineName());
	mEngineSettingsPreference.setIntent(settingsIntent);
	if (settingsIntent == null) {
	mEngineSettingsPreference.setEnabled(false);
	}
	mInstallVoicesPreference.setEnabled(false);

	if (savedInstanceState == null) {
	mLocalePreference.setEnabled(false);
	mLocalePreference.setEntries(new CharSequence[0]);
	mLocalePreference.setEntryValues(new CharSequence[0]);
	} else {
	// Repopulate mLocalePreference with saved state. Will be updated later with
	// up-to-date values when checkTtsData() calls back with results.
	final CharSequence[] entries =
	savedInstanceState.getCharSequenceArray(STATE_KEY_LOCALE_ENTRIES);
	final CharSequence[] entryValues =
	savedInstanceState.getCharSequenceArray(STATE_KEY_LOCALE_ENTRY_VALUES);
	final CharSequence value =
	savedInstanceState.getCharSequence(STATE_KEY_LOCALE_VALUE);

	mLocalePreference.setEntries(entries);
	mLocalePreference.setEntryValues(entryValues);
	mLocalePreference.setValue(value != null ? value.toString() : null);
	mLocalePreference.setEnabled(entries.length > 0);
	}

	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
	mEnginesHelper = new TtsEngines(getActivity());

	super.onCreate(savedInstanceState);

	mVoiceDataDetails = getArguments().getParcelable(ARG_VOICES);

	mTts = new TextToSpeech(getActivity().getApplicationContext(), mTtsInitListener,
	getEngineName());

	// Check if data packs changed
	checkTtsData();

	getActivity().registerReceiver(mLanguagesChangedReceiver,
	new IntentFilter(TextToSpeech.Engine.ACTION_TTS_DATA_INSTALLED),
	Context.RECEIVER_EXPORTED_UNAUDITED);
	}

	@Override
	public void onDestroy() {
	getActivity().unregisterReceiver(mLanguagesChangedReceiver);
	mTts.shutdown();
	super.onDestroy();
	}

	@Override
	public void onSaveInstanceState(Bundle outState) {
	super.onSaveInstanceState(outState);

	// Save the mLocalePreference values, so we can repopulate it with entries.
	outState.putCharSequenceArray(STATE_KEY_LOCALE_ENTRIES,
	mLocalePreference.getEntries());
	outState.putCharSequenceArray(STATE_KEY_LOCALE_ENTRY_VALUES,
	mLocalePreference.getEntryValues());
	outState.putCharSequence(STATE_KEY_LOCALE_VALUE,
	mLocalePreference.getValue());
	}

	private void checkTtsData() {
	Intent intent = new Intent(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
	intent.setPackage(getEngineName());
	try {
	if (DBG) Log.d(TAG, "Updating engine: Checking voice data: " + intent.toUri(0));
	startActivityForResult(intent, VOICE_DATA_INTEGRITY_CHECK);
	} catch (ActivityNotFoundException ex) {
	Log.e(TAG, "Failed to check TTS data, no activity found for " + intent + ")");
	}
	}

	@Override
	public void onActivityResult(int requestCode, int resultCode, Intent data) {
	if (requestCode == VOICE_DATA_INTEGRITY_CHECK) {
	if (resultCode != TextToSpeech.Engine.CHECK_VOICE_DATA_FAIL) {
	updateVoiceDetails(data);
	} else {
	Log.e(TAG, "CheckVoiceData activity failed");
	}
	}
	}

	private void updateVoiceDetails(Intent data) {
	if (data == null){
	Log.e(TAG, "Engine failed voice data integrity check (null return)" +
	mTts.getCurrentEngine());
	return;
	}
	mVoiceDataDetails = data;

	if (DBG) Log.d(TAG, "Parsing voice data details, data: " + mVoiceDataDetails.toUri(0));

	final ArrayList<String> available = mVoiceDataDetails.getStringArrayListExtra(
	TextToSpeech.Engine.EXTRA_AVAILABLE_VOICES);
	final ArrayList<String> unavailable = mVoiceDataDetails.getStringArrayListExtra(
	TextToSpeech.Engine.EXTRA_UNAVAILABLE_VOICES);

	if (unavailable != null && unavailable.size() > 0) {
	mInstallVoicesPreference.setEnabled(true);
	} else {
	mInstallVoicesPreference.setEnabled(false);
	}

	if (available == null){
	Log.e(TAG, "TTS data check failed (available == null).");
	mLocalePreference.setEnabled(false);
	} else {
	updateDefaultLocalePref(available);
	}
	}

	private void updateDefaultLocalePref(ArrayList<String> availableLangs) {
	if (availableLangs == null \|\| availableLangs.size() == 0) {
	mLocalePreference.setEnabled(false);
	return;
	}
	Locale currentLocale = null;
	if (!mEnginesHelper.isLocaleSetToDefaultForEngine(getEngineName())) {
	currentLocale = mEnginesHelper.getLocalePrefForEngine(getEngineName());
	}

	ArrayList<Pair<String, Locale>> entryPairs =
	new ArrayList<>(availableLangs.size());
	for (int i = 0; i < availableLangs.size(); i++) {
	Locale locale = mEnginesHelper.parseLocaleString(availableLangs.get(i));
	if (locale != null){
	entryPairs.add(new Pair<>(locale.getDisplayName(), locale));
	}
	}

	// Sort it
	entryPairs.sort((lhs, rhs) -> lhs.first.compareToIgnoreCase(rhs.first));

	// Get two arrays out of one of pairs
	mSelectedLocaleIndex = 0; // Will point to the R.string.tts_lang_use_system value
	CharSequence[] entries = new CharSequence[availableLangs.size()+1];
	CharSequence[] entryValues = new CharSequence[availableLangs.size()+1];

	entries[0] = getString(R.string.tts_lang_use_system);
	entryValues[0] = "";

	int i = 1;
	for (Pair<String, Locale> entry : entryPairs) {
	if (entry.second.equals(currentLocale)) {
	mSelectedLocaleIndex = i;
	}
	entries[i] = entry.first;
	entryValues[i++] = entry.second.toString();
	}

	mLocalePreference.setEntries(entries);
	mLocalePreference.setEntryValues(entryValues);
	mLocalePreference.setEnabled(true);
	setLocalePreference(mSelectedLocaleIndex);
	}

	/** Set entry from entry table in mLocalePreference */
	private void setLocalePreference(int index) {
	if (index < 0) {
	mLocalePreference.setValue("");
	mLocalePreference.setSummary(R.string.tts_lang_not_selected);
	} else {
	mLocalePreference.setValueIndex(index);
	mLocalePreference.setSummary(mLocalePreference.getEntries()[index]);
	}
	}

	/**
	* Ask the current default engine to launch the matching INSTALL_TTS_DATA activity
	* so the required TTS files are properly installed.
	*/
	private void installVoiceData() {
	if (TextUtils.isEmpty(getEngineName())) return;
	Intent intent = new Intent(TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);
	intent.setPackage(getEngineName());
	try {
	startActivity(intent);
	} catch (ActivityNotFoundException ex) {
	Log.e(TAG, "Failed to install TTS data, no activity found for " + intent + ")");
	}
	}

	@Override
	public boolean onPreferenceClick(Preference preference) {
	if (preference == mInstallVoicesPreference) {
	logEntrySelected(TvSettingsEnums.SYSTEM_A11Y_TTS_ENGINE_CONFIG_INSTALL_VOICE_DATA);
	installVoiceData();
	return true;
	} else if (preference == mEngineSettingsPreference) {
	logEntrySelected(TvSettingsEnums.SYSTEM_A11Y_TTS_ENGINE_CONFIG_SETTINGS_GTTS_ENGINE);
	return false;
	}

	return false;
	}

	@Override
	public boolean onPreferenceChange(Preference preference, Object newValue) {
	if (preference == mLocalePreference) {
	logEntrySelected(
	TvSettingsEnums.SYSTEM_A11Y_TTS_ENGINE_CONFIG_LANGUAGE_CHOOSE_LANGUAGE);
	String localeString = (String) newValue;
	updateLanguageTo((!TextUtils.isEmpty(localeString) ?
	mEnginesHelper.parseLocaleString(localeString) : null));
	return true;
	}
	return false;
	}

	private void updateLanguageTo(Locale locale) {
	int selectedLocaleIndex = -1;
	String localeString = (locale != null) ? locale.toString() : "";
	for (int i=0; i < mLocalePreference.getEntryValues().length; i++) {
	if (localeString.equalsIgnoreCase(mLocalePreference.getEntryValues()[i].toString())) {
	selectedLocaleIndex = i;
	break;
	}
	}

	if (selectedLocaleIndex == -1) {
	Log.w(TAG, "updateLanguageTo called with unknown locale argument");
	return;
	}
	mLocalePreference.setSummary(mLocalePreference.getEntries()[selectedLocaleIndex]);
	mSelectedLocaleIndex = selectedLocaleIndex;

	mEnginesHelper.updateLocalePrefForEngine(getEngineName(), locale);

	if (getEngineName().equals(mTts.getCurrentEngine())) {
	// Null locale means "use system default"
	mTts.setLanguage((locale != null) ? locale : Locale.getDefault());
	}
	}

	private String getEngineName() {
	return getArguments().getString(ARG_ENGINE_NAME, "");
	}

	private String getEngineLabel() {
	return getArguments().getString(ARG_ENGINE_LABEL, "");
	}

	@Override
	protected int getPageId() {
	return TvSettingsEnums.SYSTEM_A11Y_TTS_ENGINE_CONFIG;
	}
	}