[android-developers] I can't show random images in the ImageView

Nice day!

I tried to show random images in my application in an ImageView. I
tried this code:

public class r extends Activity{

ImageView secret;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.r);

TextView txt = (TextView) findViewById(R.id.txt);
secret = (ImageView) findViewById(R.id.secret);

Runnable r1 = new Runnable() {

@Override
public void run() {
// TODO Auto-generated method stub
int imageArr[] = new int[3];
imageArr[0] = R.drawable.r1_mirror;
imageArr[1] = R.drawable.s1_mirror;
imageArr[2] = R.drawable.p2_mirror;
int n = (int) Math.random()*3;
secret.setImageResource(imageArr[n]);

}
};

secret.postDelayed(r1, 5000);
}
}

But it only show the r1_mirror image, everytime, when I start my
application in the emulator. What I made bad? I thought that it will
working, but.

Thanks for any helps

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