android 控件跟随手指移动，类似捕鱼达人效果
16lz
2021-01-23
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; }}