自定义view进度条圆形

public class MyVicrClass extends View {

    Timer timer = null;
    int outColor = Color.BLACK;
    float du = 0;

    Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            invalidate();
            if(du>=360){
                timer.cancel();
            }
        }
    };

    public MyVicrClass(Context context) {
        super(context);
    }

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

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

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public MyVicrClass(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Paint pa = new Paint();
        Paint p1=new Paint();
        Paint p2=new Paint();

        float fw=getWidth()/2;
        float fh=getHeight()/2;

        Paint p3 = new Paint();
        p3.setColor(Color.RED);
        RectF rectF = new RectF(getWidth()/2-100,getHeight()/2-100,getWidth()/2+100,getHeight()/2+100);
        canvas.drawArc(rectF,0,du,true,p3);

        pa.setColor(Color.BLACK);
        p1.setColor(outColor);
        p2.setColor(Color.WHITE);

        pa.setTextSize(20);

        p1.setAntiAlias(true);
        p2.setAntiAlias(true);

        canvas.drawCircle(fw,fh,80,p1);
        canvas.drawCircle(fw,fh,60,p2);
        canvas.drawText("100%",fw,fh,pa);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        if(event.getAction() == MotionEvent.ACTION_DOWN){
            if(event.getX()<getWidth()/2&&event.getY()<250){
                timer = new Timer();
                timer.schedule(new TimerTask() {
                    @Override
                    public void run() {
                        du+=12;
                        handler.sendEmptyMessage(1);
                    }
                },1000,1000);
            }if(event.getX()>getWidth()/2&&event.getY()<250){
                du=0;
                handler.sendEmptyMessage(1);
            }if(event.getY()<getHeight()-100){
                outColor=Color.BLUE;
                invalidate();
            }
        }




        return super.onTouchEvent(event);

    }
}