TextToSpeech: Convierte texto a voz

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/texto"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="4dp"
        android:layout_marginTop="4dp"
        android:ems="10"
        android:inputType="textMultiLine"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/btn1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/str1" />

    <Button
        android:id="@+id/btn2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/str2" />

    <Button
        android:id="@+id/btn3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/str3" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">TTS Example</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="str1">Hablame</string>
    <string name="str2">Habla rápido</string>
    <string name="str3">Habla como gringo</string>

</resources>

01 package com.bolivia.ttsexample;
02 
03 import java.util.Locale;
04 import android.os.Bundle;
05 import android.app.Activity;
06 import android.speech.tts.TextToSpeech;
07 import android.speech.tts.TextToSpeech.OnInitListener;
08 import android.util.Log;
09 import android.view.Menu;
10 import android.view.View;
11 import android.widget.Button;
12 import android.widget.EditText;
13 
14 public class MainActivity extends Activity implements OnInitListener {
15 
16  //Motor de voz
17  private TextToSpeech tts;
18  //
19  private EditText texto;
20  private Button button1;
21  private Button button2;
22  private Button button3;
23  
24  @Override
25  protected void onCreate(Bundle savedInstanceState) {
26   super.onCreate(savedInstanceState);
27   setContentView(R.layout.activity_main);
28   
29   //===================================================== 
30   tts = new TextToSpeech( this, this );
31   texto = (EditText) findViewById(R.id.texto );
32   button1 = (Button) findViewById(R.id.btn1 );
33   button2 = (Button) findViewById(R.id.btn2 );
34   button3 = (Button) findViewById(R.id.btn3 );
35   
36   // Habla normal
37   button1.setOnClickListener(new View.OnClickListener() {
38 
39    @Override
40    public void onClick(View arg0) {
41     dime_algo( texto.getText().toString() );
42    }
43 
44   });
45   //Habla rapido
46   button2.setOnClickListener(new View.OnClickListener() {
47 
48    @Override
49    public void onClick(View arg0) {
50     tts.setPitch(3); //incrementa velocidad
51     dime_algo( texto.getText().toString() );
52     tts.setPitch(1);//restaura velocidad
53    }
54 
55   });
56   //habla en ingles
57   button3.setOnClickListener(new View.OnClickListener() {
58 
59    @Override
60    public void onClick(View arg0) {
61     tts.setLanguage( Locale.ENGLISH );
62     dime_algo( texto.getText().toString() );
63     tts.setLanguage( Locale.getDefault() );
64    }
65 
66   });
67   //=====================================================
68  }
69 
70  @Override
71  public boolean onCreateOptionsMenu(Menu menu) {
72   // Inflate the menu; this adds items to the action bar if it is present.
73   getMenuInflater().inflate(R.menu.main, menu);
74   return true;
75  }
76 
77  //Inicia TTS
78  @Override
79  public void onInit(int status) {
80   
81   if ( status == TextToSpeech.SUCCESS ) {
82 
83    //coloca lenguaje por defecto en el celular, en nuestro caso el lenguaje es aspañol ;)
84    int result = tts.setLanguage( Locale.getDefault() );
85 
86    if (result == TextToSpeech.LANG_MISSING_DATA || result == TextToSpeech.LANG_NOT_SUPPORTED) {
87     button1.setEnabled(false);
88     button2.setEnabled(false);
89     button3.setEnabled(false);
90     Log.e("TTS", "This Language is not supported");
91    } else {
92     button1.setEnabled(true);
93     button2.setEnabled(true);
94     button3.setEnabled(true);
95    }
96 
97   } else {
98    Log.e("TTS", "Initilization Failed!");
99   }
100  }
101 
102  /**
103  * metodo para convertir texto a voz
104  * @param String texto
105  * */
106  private void dime_algo( String texto ) {
107   tts.speak( texto, TextToSpeech.QUEUE_FLUSH, null );
108  }
109  
110  //Cuando se cierra la aplicacion se destruye el TTS
111  @Override
112  public void onDestroy() {
113   if (tts != null) {
114    tts.stop();
115    tts.shutdown();
116   }
117   super.onDestroy();
118  }
119  
120 }//-->fin clase