TtsService: support changing language to the user locale when they change the system language.

android/src/com/reecedunn/espeak/TtsService.java

@@ -66,6 +66,7 @@ public class TtsService extends TextToSpeechService {
     private Voice mMatchingVoice = null;
 
     private BroadcastReceiver mOnLanguagesDownloaded = null;
+    private BroadcastReceiver mOnSystemLocaleChanged = null;
 
     private String mLanguage = DEFAULT_LANGUAGE;
     private String mCountry = DEFAULT_COUNTRY;
@@ -75,6 +76,18 @@ public class TtsService extends TextToSpeechService {
     public void onCreate() {
         initializeTtsEngine();
         super.onCreate();
+
+        mOnSystemLocaleChanged = new BroadcastReceiver() {
+            @Override
+            public void onReceive(Context context, Intent intent) {
+                Locale locale = Locale.getDefault();
+                int ret = onLoadLanguage(locale.getISO3Language(), locale.getISO3Country(), locale.getVariant());
+                Log.i("LocaleChange", "Locale = " + locale + "; status = " + ret);
+            }
+        };
+
+        final IntentFilter filter = new IntentFilter(Intent.ACTION_LOCALE_CHANGED);
+        registerReceiver(mOnSystemLocaleChanged, filter);
     }
 
     @Override
@@ -83,6 +96,9 @@ public class TtsService extends TextToSpeechService {
         if (mOnLanguagesDownloaded != null) {
             unregisterReceiver(mOnLanguagesDownloaded);
         }
+        if (mOnSystemLocaleChanged != null) {
+            unregisterReceiver(mOnSystemLocaleChanged);
+        }
     }
 
     /**
@@ -203,7 +219,7 @@ public class TtsService extends TextToSpeechService {
     @Override
     protected synchronized void onSynthesizeText(
             SynthesisRequest request, SynthesisCallback callback) {
-        final int result = onLoadLanguage(request.getLanguage(), request.getCountry(), request.getVariant());
+        final int result = onLoadLanguage(mLanguage, mCountry, mVariant);
         switch (result) {
         case TextToSpeech.LANG_MISSING_DATA:
         case TextToSpeech.LANG_NOT_SUPPORTED: