Android自定义带加载动画效果的环状进度条

public class CircleProgressView extends View{
  private Paint mCirPaint;
  private Paint mArcPaint;
  private Paint mTextPaint;
  private float radius=200;
  private int textsize=60;
  private int progress=68;
  private int stokeWidth=10;
  private int circleColor=Color.GRAY;
  private int arcColor=Color.GREEN;
  private int textColor=Color.BLACK;
  private int speed=0;
  public CircleProgressView(Context context) {
    super(context);
  }

  public CircleProgressView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
  }

  public CircleProgressView(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  public void setRadius(float radius){
    this.radius=radius;
    invalidate();
  }

  public void setTextSize(int textsize){
    this.textsize=textsize;
    invalidate();
  }

  public void setProgress(int progress){
    this.progress=progress;
  }

  public void setStokewidth(int stokeWidth){
    this.stokeWidth=stokeWidth;
    invalidate();
  }

  public void setColor(int circleColor,int arcColor,int textColor){
    this.circleColor=circleColor;
    this.arcColor=arcColor;
    this.textColor=textColor;
    invalidate();
  }

  public void setSpeed(int speed){
    this.speed=speed;
  }

  private void init() {
    mCirPaint=new Paint();
    mCirPaint.setColor(circleColor);
    mCirPaint.setAntiAlias(true);
    mCirPaint.setStyle(Paint.Style.STROKE);
    mCirPaint.setStrokeWidth(stokeWidth);

    mArcPaint=new Paint();
    mArcPaint.setColor(arcColor);
    mArcPaint.setAntiAlias(true);
    mArcPaint.setStyle(Paint.Style.STROKE);
    mArcPaint.setStrokeWidth(stokeWidth);

    mTextPaint=new Paint();
    mTextPaint.setColor(textColor);
    mTextPaint.setTextSize(textsize);
    mTextPaint.setAntiAlias(true);
  }

  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    init();
    float centerX=getWidth()/2;
    float centerY=getHeight()/2;
    canvas.drawCircle(centerX,centerY,radius,mCirPaint);
    canvas.drawArc(centerX-radius,centerY-radius,centerX+radius,centerY+radius,-90,progress*360/100,false,mArcPaint);
    canvas.drawText(progress+"%",centerX-(mTextPaint.measureText(progress+"%"))/2,centerY+textsize/2,mTextPaint);
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    if (speed!=0){
      startProgress();
    }
  }

  public void startProgress(){
    final int preProgress=progress;
    new CountDownTimer(preProgress * speed, speed) {
      @Override
      public void onTick(long l) {
        setProgress(preProgress-(int) (l/speed));
        invalidate();
      }

      @Override
      public void onFinish() {
        setProgress(preProgress);
        invalidate();
        this.cancel();
      }
    }.start();
  }

}

  mCircleProgressView= (CircleProgressView) findViewById(R.id.circle_progress);
    mCircleProgressView.setProgress(progress);
    mCircleProgressView.setRadius(300);
    mCircleProgressView.setStokewidth(60);
    mCircleProgressView.setTextSize(80);
    mCircleProgressView.setColor(Color.GRAY,Color.RED,Color.BLUE);
    mCircleProgressView.setSpeed(20);