layout_text_to_speech.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="<http://schemas.android.com/apk/res/android>"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter text here!"
android:id="@+id/textToSpeak"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_below="@id/textToSpeak"
android:id="@+id/btnSpeak"/>
</RelativeLayout>
AndroidTextToSpeechActivity.java
public class AndroidTextToSpeechActivity extends Activity implements
TextToSpeech.OnInitListener {
EditText textToSpeak = null;
Button btnSpeak = null;
TextToSpeech tts;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
textToSpeak = findViewById(R.id.textToSpeak);
btnSpeak = findViewById(R.id.btnSpeak);
btnSpeak.setEnabled(false);
tts = new TextToSpeech(this, this);
btnSpeak.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
speakOut();
}
});
}
@Override
public void onDestroy() {
// Don't forget to shutdown tts!
if (tts != null) {
tts.stop();
tts.shutdown();
}
super.onDestroy();
}
@Override
public void onInit(int status) {
if (status == TextToSpeech.SUCCESS) {
int result = tts.setLanguage(Locale.US);
if (result == TextToSpeech.LANG_MISSING_DATA
|| result == TextToSpeech.LANG_NOT_SUPPORTED) {
Log.e("TTS", "This Language is not supported");
} else {
btnSpeak.setEnabled(true);
speakOut();
}
} else {
Log.e("TTS", "Initilization Failed!");
}
}
private void speakOut() {
String text = textToSpeak.getText().toString();
if(text == null || text.isEmpty())
return;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
String utteranceId=this.hashCode() + "";
tts.speak(text, TextToSpeech.QUEUE_FLUSH, null, utteranceId);
} else {
tts.speak(text, TextToSpeech.QUEUE_FLUSH, null);
}
}
}
The language to be spoken can be set by providing a [Locale](<https://developer.android.com/reference/java/util/Locale.htm>)
to the [setLanguage()](<https://developer.android.com/reference/android/speech/tts/TextToSpeech.html#setLanguage(java.util.Locale)>)
method:
tts.setLanguage(Locale.CHINESE); // Chinese language
The number of supported languages varies between Android levels. The method [isLanguageAvailable()](<https://developer.android.com/reference/android/speech/tts/TextToSpeech.html#isLanguageAvailable(java.util.Locale)>)
can be used to check if a certain language is supported:
tts.isLanguageAvailable(Locale.CHINESE);
The speech pitch level can be set by using the [setPitch()](<https://developer.android.com/reference/android/speech/tts/TextToSpeech.html#setPitch(float)>)
method. By default, the pitch value is 1.0. Use values less than 1.0 to decrease the pitch level or values greater than 1.0 to increase the pitch level:
tts.setPitch(0.6);
The speech rate can be set using [setSpeechRate()](<https://developer.android.com/reference/android/speech/tts/TextToSpeech.html#setSpeechRate(float)>)
. The default speech rate is 1.0. The speech rate can be doubled by setting it to 2.0 or made half by setting it to 0.5:
tts.setSpeechRate(2.0);