Question

I need to change an ImageView when a sound ends , but when I try to use a thread to use it whitout to freeze the screem the application closes;

mp = MediaPlayer.create(this, R.raw.ave_maria);
    mp.start();
    im = (ImageView) findViewById(R.id.imag1);

    Thread thread = new Thread() {
        public void run() {

            while (mp.isPlaying()) {

            }
            im.setImageResource(R.drawable.primeiro_misterio_gozoso07);
        }
    };
    thread.start();

Answer 1

You should to syncronize the code with thread UI.

mp = MediaPlayer.create(this, R.raw.ave_maria);
    mp.start();
    im = (ImageView) findViewById(R.id.imag1);

    Thread thread = new Thread() {
        public void run() {

            while (mp.isPlaying()) {

            }
            //YouActivity 
            YouActivity.this.runOnUiThread(new Runnable() {

            public void run() {
               im.setImageResource(R.drawable.primeiro_misterio_gozoso07);

            }
    });

        }
    };
    thread.start();