Tutorial to develop text to speech app on Android

This tutorial will show how to develop simple Text to speech application on
android(tested on htc droid incredible).  It assumes that you have already
managed to develop hello world(or default project ) in Eclipse per http://android-java.blogspot.com/

• Step 1 - Create default android project in Eclipse. Run it to make

sure it works.

• Step 2- Replace below code in your main(activity class). You may need to change package and class name.(This code is tweak of sdk sample - ie its simplified )

  

package com.test;//change this
import android.app.Activity;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import com.test.R; //change this
import java.util.Locale;
import java.util.Random;
public class TestAct extends Activity implements
TextToSpeech.OnInitListener {
    private static final String TAG = "TextToSpeechDemo";
    private TextToSpeech mTts;
    private Button mAgainButton;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        // Initialize text-to-speech. This is an asynchronous operation.
        // The OnInitListener (second argument) is called after initialization completes.
        mTts = new TextToSpeech(this,
            this  //TextToSpeech.OnInitListener
            );
        mAgainButton = (Button) findViewById(R.id.again_button);
        mAgainButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v)
            {
                sayHello();
            }
        });
    }
    @Override
    public void onDestroy() {
        // Don't forget to shutdown!
        if (mTts != null) {
            mTts.stop();
            mTts.shutdown();
        }
        super.onDestroy();
    }
    // Implements TextToSpeech.OnInitListener.
    public void onInit(int status) {
        // status can be either TextToSpeech.SUCCESS or TextToSpeech.ERROR.
        if (status == TextToSpeech.SUCCESS) {
                       int result = mTts.setLanguage(Locale.US);
           
            if (result == TextToSpeech.LANG_MISSING_DATA ||
                result == TextToSpeech.LANG_NOT_SUPPORTED) {
               // Lanuage data is missing or the language is not supported.
                Log.e(TAG, "Language is not available.");
            } else {
                // Check the documentation for other possible result codes.
                // For example, the language may be available for the locale,
                // but not for the specified country and variant.
                // The TTS engine has been successfully initialized.
                // Allow the user to press the button for the app to speak again.
                mAgainButton.setEnabled(true);
                // Greet the user.
                sayHello();
            }
        } else {
            // Initialization failed.
            Log.e(TAG, "Could not initialize TextToSpeech.");
        }
    }
    private static final Random RANDOM = new Random();
    private static final String[] HELLOS = {
      "Hello World",
      "This is Text to speech demo by Zahid Shaikh"
      
    };
    int i =0;
    private void sayHello() {
        // Select a random hello.
        int helloLength = HELLOS.length;
        String hello = HELLOS[i];
        i++;
        if(i == helloLength) i =0;
        mTts.speak(hello,
            TextToSpeech.QUEUE_FLUSH,  // Drop allpending entries in the playback queue.
            null);
    }
}

• Step 3 -   Change res/main/layout.xml (or equivalent)

<linearlayout android:background="#ff00ff" android:layout_height="fill_parent" android:layout_width="fill_parent" android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android">
    <button android:enabled="false" android:id="@+id/again_button" android:layout_height="wrap_content" android:layout_width="wrap_content" android:minlines="3" android:text="@string/again" type="submit"> </button>


</linearlayout>

• Step 4 - change res/values/string.xml

<resources>
    <string name="hello">hi world</string>
    <string name="app_name">test</string>
<string name="again">Again</string>
<string name="red">red</string>

<string name="white">#FF00FF</string>
</resources>

• Run your code - and press on the again button!!!