android view的自定义

public class YanghangCreditCircle extends View {

    private static final String TAG = "YanghangCreditCircle";

    private int resid = R.drawable.credit_report_turntable;
    public YanghangCreditCircle(Context context) {
        super(context);
        init();
    }

    public YanghangCreditCircle(Context context, AttributeSet attrs) {
        super(context, attrs);
        TypedArray t = getContext().obtainStyledAttributes(attrs,R.styleable.YanghangCreditCircle);
        resid = t.getResourceId(R.styleable.YanghangCreditCircle_itembackground,R.drawable.credit_report_turntable);
        init();
    }

    private void init() {
        progressPen = new Paint();
        progressPen.setAntiAlias(true);
        progressPen.setStyle(Paint.Style.STROKE);
        progressPen.setColor(Color.WHITE);
        progressPen.setStrokeWidth(margin);//画笔框的宽度margin，画笔从中间画

        circleBmp = BitmapFactory.decodeResource(getResources(), resid);
        bmpPaint.setAntiAlias(true);
    }

//    private float outsidePenSize;
    private Paint progressPen;

    private Bitmap circleBmp;
    private float degress = 0;
    float margin = UIUtil.INSTANCE.DipToPixels(10);
    private Paint bmpPaint = new Paint();

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        float width = circleBmp.getWidth() + (margin) * 2;
        float height = circleBmp.getHeight() + (margin)*2;
        widthMeasureSpec = MeasureSpec.makeMeasureSpec((int) width, MeasureSpec.EXACTLY);
        heightMeasureSpec = MeasureSpec.makeMeasureSpec((int) height, MeasureSpec.EXACTLY);
        setMeasuredDimension(widthMeasureSpec, heightMeasureSpec);
    }

    public void setProgress(float degress){
        this.degress = 5f + 205f*degress;
        postInvalidate();//刷新onDraw
    }

    public void setdegressProgress(float degress) {
        this.degress = degress;
        postInvalidate();
    }
//    (  0,700] E
//            (700,840] D
//             (840,890] C
//             (890,930] B
//             (930,1000] A

    @Override
    public void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Rect rect = new Rect();
        getDrawingRect(rect);

        int bmpWidth = (int) (circleBmp.getWidth() / 2.0f);
        int bmpHeight = (int) (circleBmp.getHeight() / 2.0f);
        Rect dstRect = new Rect();
        dstRect.set(rect.centerX() - bmpWidth, rect.centerY() - bmpHeight,
                rect.centerX() + bmpWidth, rect.centerY() + bmpHeight);//canvas上的目标区域

        RectF outsideCircleRect = new RectF(dstRect.left + margin/2, dstRect.top + margin/2, dstRect.left + dstRect.width() - margin/2,
                dstRect.top + dstRect.width() - margin/2);

        canvas.drawBitmap(circleBmp, null, dstRect, bmpPaint);//显示整个图片在特定的矩形区域内
        progressPen.setAlpha(100);

        canvas.drawArc(outsideCircleRect, 160f, degress, false, progressPen);

        float tmpDegress = degress;
        canvas.save();

    }
}