Déclencher l'image Scanner Intent

Bonjour
Voici le code pour déclencher l'image Scanner Intent sous Android:
public class MediaScannerDemoActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

Button buttonMediaScanner = (Button) findViewById(R.id.buttonMediaScanner);

//Add onClick event on Media scanner button
buttonMediaScanner.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View view) {

//Broadcast the Media Scanner Intent to trigger it
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri
.parse("file://"
+ Environment.getExternalStorageDirectory())));

//Just a message
Toast toast = Toast.makeText(getApplicationContext(),
"Media Scanner Triggered...", Toast.LENGTH_SHORT);
toast.show();
}
});

}
}