ExternalTextToSpeech.java

Go to the documentation of this file.

// -*- mode: java; c-basic-offset: 2; -*-
// Copyright 2009-2011 Google, All Rights reserved
// Copyright 2011-2012 MIT, All rights reserved
// Released under the Apache License, Version 2.0
// http://www.apache.org/licenses/LICENSE-2.0
 
package com.google.appinventor.components.runtime.util;
 
import com.google.appinventor.components.runtime.ActivityResultListener;
import com.google.appinventor.components.runtime.ComponentContainer;
 
import android.app.Activity;
import android.content.Intent;
import android.speech.tts.TextToSpeech;
 
import java.util.Locale;
 
// Note(Hal): I have not looked at making the changes for retries, similar to the ones in
// InternalTextToSpeech.   The use of ExternalTTS is for pre-1.6 systems only, so is obsolete.
// And I don't have an old external TTS library to use in testing, anyway.
 
public class ExternalTextToSpeech implements ITextToSpeech, ActivityResultListener {
 
  private static final String TTS_INTENT = "com.google.tts.makeBagel";
 
  /* Used to identify the call to startActivityForResult. Will be passed back
     into the resultReturned() callback method. */
  private int requestCode;
 
  private final ComponentContainer container;
 
  private final TextToSpeechCallback callback;
 
  public ExternalTextToSpeech(ComponentContainer container,
                              TextToSpeechCallback callback) {
    this.container = container;
    this.callback = callback;
  }
 
  @Override
  public void speak(String message, Locale loc) {
    Intent intent = new Intent(TTS_INTENT);
    intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
    intent.setFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
    intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
    intent.putExtra("message", message);
    intent.putExtra("language", loc.getISO3Language());
    intent.putExtra("country", loc.getISO3Country());
    if (requestCode == 0) {
      requestCode = container.$form().registerForActivityResult(this);
    }
    container.$context().startActivityForResult(intent, requestCode);
  }
 
  @Override
  public void onDestroy() {
    // nothing to do
  }
 
  @Override
  public void onStop() {
    // nothing to do
  }
 
  @Override
  public void onResume() {
    // nothing to do
  }
 
  @Override
    public void setPitch(float pitch) {
        // nothing to do
    }
 
    @Override
    public void setSpeechRate(float speechRate) {
    // nothing to do
  }
 
  @Override
  public void resultReturned(int requestCode, int resultCode, Intent data) {
    boolean isSuccess = (requestCode == this.requestCode) && (resultCode == Activity.RESULT_OK);
    if (isSuccess) {
      callback.onSuccess();
    } else {
      callback.onFailure();
    }
  }
 
  // External TextToSpeech is obsolete, so we'll just report that no languages are available
  // In reality, we won't call this from TextToSpeech in pre-Gingerbread systems
  public int isLanguageAvailable(Locale loc) {
    return TextToSpeech.LANG_MISSING_DATA;
  }
 
// this is a dummy.  We'll never use this for external TTS engines
  public boolean isInitialized() {
    return true;
  }
}