Code Java Android pour déclencher un discours à l'API SMS

Bonjour
Voici le code Java Android pour déclencher un discours à l'API SMS:
public class MainActivity extends Activity {

protected static final int RESULT_SPEECH = 1;

private ImageButton btnSpeak;
private TextView txtText;

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

txtText = (TextView) findViewById(R.id.txtText);

btnSpeak = (ImageButton) findViewById(R.id.btnSpeak);

btnSpeak.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {

Intent intent = new Intent(
RecognizerIntent.ACTION_RECOGNIZE_SPEECH);

intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, "en-US");

try {
startActivityForResult(intent, RESULT_SPEECH);
txtText.setText("");
} catch (ActivityNotFoundException a) {
Toast t = Toast.makeText(getApplicationContext(),
"Opps! Your device doesn't support Speech to Text",
Toast.LENGTH_SHORT);
t.show();
}
}
});

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);

switch (requestCode) {
case RESULT_SPEECH: {
if (resultCode == RESULT_OK && null != data) {

ArrayList<String> text = data
.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);

txtText.setText(text.get(0));
}
break;
}

}
}
}