android 控件跟随手指移动，类似捕鱼达人效果

public class TestActivity extends AppCompatActivity {    private ImageView imageView;    private ImageView imageView2;    private Context context;    //defalut旋转开始角度    private float dfFromDegrees = -90;    //旋转结束角度    private float dfToDegrees = 90;    private ObjectAnimator animator;    //动画类型    private String propertyName = "rotation";    //持续时间    private long duration = 3000;    //重复模式    int RepeatCount = -1;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_test);        context = TestActivity.this;        initView();        initAnimator();        animatorStart();    }    //初始化动画    private void initAnimator() {        animator = ObjectAnimator.ofFloat(imageView, propertyName, dfFromDegrees, dfToDegrees);        animator.setDuration(duration);        animator.setRepeatCount(RepeatCount);        animator.setRepeatMode(ValueAnimator.REVERSE);    }    private void initView() {        imageView = (ImageView) findViewById(R.id.image);        imageView2 = (ImageView) findViewById(R.id.image2);        imageView2.setVisibility(View.GONE);    }    @Override    public boolean dispatchTouchEvent(MotionEvent ev) {        LogUtil.i("countAngle(ev):" + countAngle(ev));        switch (ev.getAction()) {            case MotionEvent.ACTION_DOWN:                LogUtil.i("ACTION_DOWN");                animatorCancel();                setImageView2TransLation(ev, true);                imageView.setRotation(countAngle(ev));                break;            case MotionEvent.ACTION_MOVE:                LogUtil.i("ACTION_MOVE");                animatorCancel();                imageView2.setVisibility(View.VISIBLE);                setImageView2TransLation(ev, true);                imageView.setRotation(countAngle(ev));                break;            case MotionEvent.ACTION_UP:                LogUtil.i("ACTION_UP");                imageView2.setVisibility(View.GONE);                setAnimatorDegrees(dfFromDegrees, dfToDegrees);                setImageView2TransLation(ev, false);                animatorStart();                break;        }        return super.dispatchTouchEvent(ev);    }    //计算点击角度    private float countAngle(MotionEvent event) {        //点击的坐标X        float clickX = event.getX();        //点击的坐标Y        float clickY = event.getY();        //imageView控件X坐标        float viewX = imageView.getX() + imageView.getPivotX();        float viewY = imageView.getY() + imageView.getPivotY();        return getRotationBetweenLines(viewX, viewY, clickX, clickY);    }    //设置控件2位置是否隐藏    private void setImageView2TransLation(MotionEvent ev, boolean isShow) {        imageView2.setTranslationX(ev.getX() - imageView2.getWidth() / 2);        imageView2.setTranslationY(ev.getY() - imageView2.getHeight());        imageView2.setVisibility(isShow ? View.VISIBLE : View.GONE);    }    //设置动画旋转角度    private void setAnimatorDegrees(float fromDegrees, float toDegrees) {        animator = ObjectAnimator.ofFloat(imageView, propertyName, fromDegrees, toDegrees);        animator.setDuration(3000);        animator.setRepeatCount(-1);        animator.setRepeatMode(ValueAnimator.REVERSE);    }    //开始动画    private void animatorStart() {        if (animator != null)            animator.start();    }    //关闭动画    private void animatorCancel() {        if (animator != null)            animator.cancel();    }    //centerX、centerY为公共点，xInView、yInView为触摸点的坐标    public int getRotationBetweenLines(float centerX, float centerY, float xInView, float yInView) {        double rotation = 0;        double k1 = (double) (centerY - centerY) / (centerX * 2 - centerX);        double k2 = (double) (yInView - centerY) / (xInView - centerX);        double tmpDegree = Math.atan((Math.abs(k1 - k2)) / (1 + k1 * k2)) / Math.PI * 180;        if (xInView > centerX && yInView < centerY) {  //第一象限            rotation = 90 - tmpDegree;        } else if (xInView > centerX && yInView > centerY) //第二象限        {            rotation = 90 + tmpDegree;        } else if (xInView < centerX && yInView > centerY) { //第三象限            rotation = 270 - tmpDegree;        } else if (xInView < centerX && yInView < centerY) { //第四象限            rotation = 270 + tmpDegree;        } else if (xInView == centerX && yInView < centerY) {            rotation = 0;        } else if (xInView == centerX && yInView > centerY) {            rotation = 180;        }        return (int) rotation;    }}
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