package UICtrl; import android.animation.ObjectAnimator; import android.content.Context; import android.graphics.Canvas; import android.view.animation.Interpolator; import android.graphics.Paint; import android.graphics.PointF; import android.os.Build; import android.util.AttributeSet; import android.view.ViewGroup; import android.view.animation.AccelerateDecelerateInterpolator; import android.view.animation.AccelerateInterpolator; import android.view.animation.DecelerateInterpolator; import android.view.animation.LinearInterpolator; import android.widget.RelativeLayout; /**  * Created by wangchaomac on 2017/10/18.  */ public class AroundCircleBall extends RelativeLayout {
      private  BallView mBall;     //角度     private  float mBallRadius;     //小球的颜色     private  int mBallColor;     private int mCircleRadius;     private int mCircleColor;     private int mDuration;     //笔头描宽     private float mStrokeWidth;     private int mInterpolator;     private final int ACCELERATE_DECELERATE_INTERPOLATOR = 1;     private final int LINEAR_INTERPOLATOR = 2;     private final int ACCELERATE = 3;     private final int DECELERATE = 4;     ObjectAnimator mRotateAnim;     PointF mCircleCenterPoint = new PointF(mCircleRadius + mBallRadius, mCircleRadius + mBallRadius);     Paint mPaint = new Paint();     public AroundCircleBall(Context context, AttributeSet attrs){
          super(context, attrs);         // TODO Auto-generated constructor stub         init(context);     }     private void init(Context context){
          init();     }     private void init() {
          mBall = new BallView(getContext());         mBall.setRadius(mBallRadius);         mBall.setBallColor(mBallColor);         //小球的初始位置在圆环的最底部         LayoutParams params = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);         params.leftMargin = (int) (mCircleRadius);         params.topMargin = (int) (mCircleRadius * 2);         mBall.setLayoutParams(params);         addView(mBall);     }     @Override     protected void onDraw(Canvas canvas) {
          //绘制圆         mPaint.setStyle(Paint.Style.STROKE);         mPaint.setStrokeWidth(mStrokeWidth);         mPaint.setColor(mCircleColor);         canvas.drawCircle(mCircleCenterPoint.x, mCircleCenterPoint.y, mCircleRadius, mPaint);         super.onDraw(canvas);     }     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          super.onMeasure(widthMeasureSpec, heightMeasureSpec);         //测量控件宽高         int width = (int) (getPaddingLeft() + mCircleRadius * 2 + mBallRadius * 2 + getPaddingRight());         int height = (int) (getPaddingTop() + mCircleRadius * 2 + mBallRadius * 2 + getPaddingBottom());         setMeasuredDimension(width, height);     }     private void initRotateAnim(){
          mRotateAnim = ObjectAnimator.ofFloat(mBall, "rotation", 0f, 360f);         //计算小球旋转的中心点(此点的左边是在小球自身的坐标系中)         float pivotX = mBall.getRadius();         float pivotY = mBall.getRadius() - mCircleRadius;         mBall.setPivotX(pivotX);         mBall.setPivotY(pivotY);         mRotateAnim.setDuration(mDuration);         mRotateAnim.setInterpolator(getInterpolator());         mRotateAnim.setRepeatCount(-1);         mRotateAnim.setStartDelay(500);     }     private Interpolator getInterpolator(){
          Interpolator interpolator = null;         switch (mInterpolator){
              case ACCELERATE_DECELERATE_INTERPOLATOR:    //先加上后减速                 interpolator = new AccelerateDecelerateInterpolator();                 break;             case LINEAR_INTERPOLATOR:   //匀速                 interpolator = new LinearInterpolator();                 break;             case ACCELERATE:    //加速                 interpolator = new AccelerateInterpolator();                 break;             case DECELERATE:    //减速                 interpolator = new DecelerateInterpolator();                 break;         }         return interpolator;     }     /**      * 启动旋转动画      */     public void startRotate(){
          if (mRotateAnim != null){
              mRotateAnim.start();         }     }     /**      * 暂停旋转动画      */     @RequiresApi(api = Build.VERSION_CODES.KITKAT)     public void pauseRotate(){
          if (mRotateAnim != null && mRotateAnim.isRunning()){
              mRotateAnim.pause();         }     }     /**      * 取消旋转动画      */     public void cancelRotate(){
          if (mRotateAnim != null){
              mRotateAnim.cancel();         }     } }

package UICtrl; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.PointF; import android.util.AttributeSet; import android.view.View; /**  * Created by wangchaomac on 2017/10/18.  */ public class BallView extends View {
      private int mBallColor = Color.BLACK;     private float mRadius = 10f;     private PointF mCenterPoint;     private Paint mPaint;     public BallView(Context context) {
          this(context, null);     }     public BallView(Context context, AttributeSet attrs) {
          super(context, attrs);         init();     }     private void init(){
          mPaint = new Paint();         mPaint.setAntiAlias(true);         mCenterPoint = new PointF(mRadius, mRadius);     }     @Override     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          super.onMeasure(widthMeasureSpec, heightMeasureSpec);         int width = (int) (getPaddingLeft() + 2*mRadius + getPaddingRight());         int height = (int) (getPaddingTop() + 2*mRadius + getPaddingBottom());         setMeasuredDimension(width, height);     }     @Override     protected void onDraw(Canvas canvas) {
          mPaint.setStyle(Paint.Style.FILL);         mPaint.setColor(mBallColor);         canvas.drawCircle(mCenterPoint.x, mCenterPoint.y, mRadius, mPaint);     }     public void setBallColor(int mBallColor) {
          this.mBallColor = mBallColor;     }     public void setRadius(float radius) {
          this.mRadius = radius;         mCenterPoint.set(radius, radius);     }     public float getRadius() {
          return mRadius;     } }