组合动画

public class MainActivity extends AppCompatActivity {

    private ImageView img;
    private AnimatorSet set;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        img = (ImageView) findViewById(R.id.img);//添加动画的控件
        ObjectAnimator a1 = ObjectAnimator.ofFloat(img, "translationY", 0f, 500f);
        //屏幕上方移动到中间
        ObjectAnimator a2 = ObjectAnimator.ofFloat(img, "scaleX",  2f, 1f);
        ObjectAnimator a3 = ObjectAnimator.ofFloat(img, "scaleY",  2f, 1f);
        //缩放由一倍到二倍
        ObjectAnimator a4 = ObjectAnimator.ofFloat(img, "alpha", 0.0f, 1f);
        //渐变从透明到不透明
        ObjectAnimator a5 = ObjectAnimator.ofFloat(img, "rotation", 0f, 360f);
        set = new AnimatorSet();
        set.playTogether(a1,a2,a3,a4,a5);//组合动画同时运行
        set.setDuration(2000);//设置动画的时间
        set.start();//开始动画
        set.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animation) {
                 //动画开始时
            }

            @Override
            public void onAnimationEnd(Animator animation) {
                //动画结束时
            }

            @Override
            public void onAnimationCancel(Animator animation) {
               //取消动画时
            }

            @Override
            public void onAnimationRepeat(Animator animation) {
                    //继续动画时
            }
        });
    }
}