摇晃动画的三种实现方式

是对图标形态的动画，不用实际改变图标的位置。

方式一：ObjectAnimator类

ObjectAnimator animation2 = ObjectAnimator.ofFloat(mImageView,"rotation",0,-24,0,20,-12,0,10,0,-7,0,5,0);
animation2.setInterpolator(new DecelerateInterpolator());
animation2.setDuration(1000);
animation2.setRepeatMode(ValueAnimator.REVERSE);
animation2.start();
mImageView.setPivotX(mImageView.getMeasuredWidth() / 2);
mImageView.setPivotY(mImageView.getMeasuredHeight());

方式二：RotateAnimation类

RotateAnimation animation1 = new RotateAnimation(-20,20,Animation.RELATIVE_TO_SELF,0.5f,Animation.RELATIVE_TO_SELF,1f);
        CycleInterpolator cycleInterpolator = new CycleInterpolator(5);
        animation1.setInterpolator(new CycleInterpolator(5));
//        animation1.setRepeatCount(1);
//        animation1.setRepeatMode(Animation.REVERSE);
        animation1.setDuration(1000);
        mImageView.startAnimation(animation1);

方式三：自定义动画 ShakeAnimation 继承Animaiton 覆写
applyTransformation方法

```java
public class WaveAnimation extends Animation {

    private final int mWaveTimes;//摇摆次数
    private float mWaveRange;//摇摆幅度
    /**
     * 根据view的宽高确定旋转中心
     */
    private final int mWidth;
    private final int mHeight;
    /**
     * 动态改变摇摆的幅度
     */
    private final ValueAnimator mValueAnimator;
    private static final float SHAKERANGE_MIN = 0;

    public WaveAnimation(int width, int height, int waveTimes, float waveRange) {
        this.mWidth = width;
        this.mHeight = height;
        this.mWaveTimes = waveTimes;
        this.mWaveRange = waveRange;
        this.mValueAnimator = ValueAnimator.ofFloat(mWaveRange, SHAKERANGE_MIN);
    }

    public void setShakeRange(float shakeRange) {
        this.mWaveRange = shakeRange;
    }

    @Override
    protected void applyTransformation(float interpolatedTime,
                                       Transformation t) {

        t.getMatrix().setRotate((float) (Math.sin(interpolatedTime * Math.PI * mWaveTimes) * mWaveRange), mWidth, mHeight);
        super.applyTransformation(interpolatedTime, t);

        if (mValueAnimator != null && !mValueAnimator.isRunning()) {
            changeWaveRange();
        }
    }

    public void changeWaveRange() {
        mValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float value = (float) animation.getAnimatedValue();
                setShakeRange(value);
            }
        });
        mValueAnimator.setDuration(1000);
        mValueAnimator.start();
    }
}