I have a problem with the animation.

package com.example.crystalball3;

import android.app.Activity;
import android.graphics.drawable.AnimationDrawable;
import android.hardware.Sensor;
import android.hardware.SensorManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.view.Menu;
import android.view.animation.AlphaAnimation;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.crystalball3.ShakeDetector.OnShakeListener;

public class MainActivity extends Activity {
    private CrystalBall3 mCrystalBall3 = new CrystalBall3();
    private TextView mAnwserLabel;
    private ImageView mCrystalBall3Image;
    private SensorManager mSensorManager;
    private Sensor mAccelerometer;
    private ShakeDetector mShakeDetector;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
      mAnwserLabel = (TextView) findViewById(R.id.textView1);
      mCrystalBall3Image = (ImageView) findViewById(R.id.imageView1);

      mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
      mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
      mShakeDetector = new ShakeDetector(new OnShakeListener() {

        @Override
        public void onShake() {
            handleNewAnwser();

        }
    });     
            }
   @ Override
   public void onResume(){
       super.onResume();
       mSensorManager.registerListener(mShakeDetector, mAccelerometer, SensorManager.SENSOR_DELAY_UI);
   }
   @Override
   public void onPause(){
       super.onPause();
       mSensorManager.unregisterListener(mShakeDetector);
   }
            private void animateCrystalBall3() {
                // TODO Auto-generated method stub

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

                mAnwserLabel.setAnimation(fadeInAnimation);
            }
        private void playSound(){
            MediaPlayer player = MediaPlayer.create(MainActivity.this, R.raw.crystal_ball);
            player.start();
            player.setOnCompletionListener(new OnCompletionListener() {

                @Override
                public void onCompletion(MediaPlayer mp) {
                    mp.release();



                }
                 private void animateCrystalBall3(){

                        mCrystalBall3Image.setImageResource(R.drawable.ball_animation);
                        AnimationDrawable ballAnimation = (AnimationDrawable) mCrystalBall3Image.getDrawable();
                        if(ballAnimation.isRunning());{
                            ballAnimation.stop();
                        }
                        ballAnimation.start();
                    }
            });
        }
{;
    }





    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }





    private void handleNewAnwser() {
        String anwser = mCrystalBall3.getAnAnwser();


        mAnwserLabel.setText(anwser);
        animateCrystalBall3();
        animateAnwser();
        playSound();
    }


    }
    ```

Thanks For you'r time. Žiga :D