Android framgemt with imageview animate with resource animation.

MainActivityFragment.java

package br.com.luizgadao.animation;

import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;

/**
 * A placeholder fragment containing a simple view.
 */
public class MainActivityFragment extends Fragment {

    ImageView ball;
    Button btnScale, btnRotate, btnTransform, btnAlpha;
    Animation animApha, animRotate, animTrans, animScale;

    public MainActivityFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_main, container, false);

        ball = (ImageView) v.findViewById(R.id.ball);
        btnAlpha = (Button) v.findViewById(R.id.btnAlpha);
        btnRotate = (Button) v.findViewById(R.id.btnRotate);
        btnTransform = (Button) v.findViewById(R.id.btnTrans);
        btnScale = (Button) v.findViewById(R.id.btnScale);

        btnAlpha.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                animApha = loadAnimation(R.anim.alpha);
                ball.startAnimation(animApha);
            }
        });

        btnRotate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                animRotate = loadAnimation(R.anim.rotate);
                ball.startAnimation(animRotate);
            }
        });

        btnTransform.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                animTrans = loadAnimation(R.anim.translate);
                ball.startAnimation(animTrans);
            }
        });

        btnScale.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                animScale = loadAnimation(R.anim.scale);
                ball.startAnimation(animScale);
            }
        });

        return v;
    }

    private Animation loadAnimation(int resAnim){
        return AnimationUtils.loadAnimation(getContext(), resAnim);
    }
}