MainActivity.java

package arithene.tts;

import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.speech.tts.TextToSpeech.OnInitListener;
import android.app.Activity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import java.util.Locale;

public class MainActivity extends Activity implements OnInitListener {
    private TextToSpeech tts;
    private Button speakButton;
    private EditText inputText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        tts = new TextToSpeech(this, this);

        inputText = findViewById(R.id.inputText);
        speakButton = findViewById(R.id.speakButton);

        speakButton.setOnClickListener(new View.OnClickListener() {
				@Override
				public void onClick(View v) {
					speakOut();
				}
			});
    }

    @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 {
                speakButton.setEnabled(true);
            }

        } else {
            Log.e("TTS", "Initialization Failed!");
        }
    }

    private void speakOut() {
        String text = inputText.getText().toString();
        tts.speak(text, TextToSpeech.QUEUE_FLUSH, null, null);
    }

    @Override
    public void onDestroy() {
        // Shutdown TTS when activity is destroyed
        if (tts != null) {
            tts.stop();
            tts.shutdown();
        }
        super.onDestroy();
    }
}