Here is source code of the Program to Demonstrate Text to Speech in Android. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.
Main Activity

package com.example.texttospeech;

import java.util.Locale;

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 android.widget.EditText;

public class MainActivity extends Activity implements
TextToSpeech.OnInitListener {

private TextToSpeech tts;
private Button btn;
private EditText txt;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

tts = new TextToSpeech(this, this);

btn = (Button) findViewById(R.id.button1);

txt = (EditText) findViewById(R.id.editText1);
btn.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
speak();
}

});
}

@Override
public void onDestroy() {
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 {
btn.setEnabled(true);
speak();
}

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

}

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

}