工作日记第八篇（闲着无聊撸了一发属性动画ObjectAnimator、AnimatorSet）

还记得以前小时候玩GBA口袋妖怪，神奇宝贝进化的时候就有一个动画。现在就用属性动画来实现他吧~

先上传一张效果图

IMG_2767.mp4_1471923480.gif

public class MainActivity extends AppCompatActivity {

    Button btn_start;
    ImageView imageView;

    float[] moveArray = new float[30];

    final int[] imgSource = new int[]{R.mipmap.little, R.mipmap.middle, R.mipmap.max};

    int repeatCount = 0;

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


        for (int i = 0; i < moveArray.length; i++) {
            if (i % 2 == 0) {
                moveArray[i] = 0f;
                continue;
            }
            moveArray[i] = 20f;
        }
        btn_start = (Button) findViewById(R.id.btn_start);
        imageView = (ImageView) findViewById(R.id.imageView_animation);
        imageView.setImageResource(imgSource[repeatCount]);
        btn_start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                ObjectAnimator ob1 = ObjectAnimator.ofFloat(imageView, "translationX", moveArray);
                ObjectAnimator ob2 = ObjectAnimator.ofFloat(imageView, "scaleX", 1f, 0.7f, 5f);
                ObjectAnimator ob3 = ObjectAnimator.ofFloat(imageView, "scaleY", 1f, 0.7f, 5f);
                ObjectAnimator ob4 = ObjectAnimator.ofFloat(imageView, "alpha", 1f, 0f);

                final AnimatorSet animationSet = new AnimatorSet();
                animationSet.setDuration(1000);

                AnimatorSet animationSet1 = new AnimatorSet();
                animationSet1.playTogether(ob2, ob3, ob4);
                animationSet1.setDuration(500);

                //AnimatorSetq 嵌套使用
                animationSet.playSequentially(ob1, animationSet1);

                animationSet.start();
                animationSet.addListener(new Animator.AnimatorListener() {
                    @Override
                    public void onAnimationStart(Animator animation) {

                    }

                    @Override
                    public void onAnimationEnd(Animator animation) {
                        repeatCount++;
                        //全部复原
                        imageView.setAlpha(1f);
                        imageView.setScaleX(1f);
                        imageView.setScaleY(1f);

                        if (repeatCount == imgSource.length) {
                            repeatCount = -1;
                            return;
                        }
                        imageView.setImageResource(imgSource[repeatCount]);

                        animationSet.start();
                    }

                    @Override
                    public void onAnimationCancel(Animator animation) {

                    }

                    @Override
                    public void onAnimationRepeat(Animator animation) {

                    }
                });
            }
        });
    }
}

/
主要想说的就是AnimatorSet最强大的地方就是play、with、after、before可以解决所有动画播放的顺序问题，再加上嵌套使用以及添加监听器可以组合处多种花样的动画。
另外因为AnimatorSet没有setRepeatMode以及setRepeatCount的方法，所以也可以在
/

 @Override
        public void onAnimationEnd(Animator animation) {
      animationSet.start();
}

再次调用animatorSet的start()方法实现循环的作用，加上自己的判断条件就可以设置循环的次数。