Answer doesn't have the animation effect.

private CrystalBall mCrystalBall = new CrystalBall();
private TextView mAnswerLabel;
private Button mGetAnswerButton;
private ImageView mCrystalBallImage;

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

    // Assign the Views from the layout file
    mAnswerLabel = (TextView) findViewById(R.id.textView1);
    mGetAnswerButton = (Button) findViewById(R.id.button1);
    mCrystalBallImage = (ImageView) findViewById(R.id.imageView1);

    mGetAnswerButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            String answer = mCrystalBall.getAnAnswer();

            // Update the label with our dynamic answer
            mAnswerLabel.setText(answer);

            animateCrystalBall();
            animateAnswer();
        }
    });
}

private void animateCrystalBall() {
    mCrystalBallImage.setImageResource(R.drawable.ball_animation);
    AnimationDrawable ballAnimation = (AnimationDrawable) mCrystalBallImage.getDrawable();
    if (ballAnimation.isRunning()) {
        ballAnimation.stop();
    }
    ballAnimation.start();
}

private void animateAnswer() {
    AlphaAnimation fadeInAnimation = new AlphaAnimation(0, 1);
    fadeInAnimation.setDuration(1500);
    fadeInAnimation.setFillAfter(true);

    mAnswerLabel.setAnimation(fadeInAnimation);
}