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);