Android(安卓)半边圆角ImageView

public class RectRoundedImageView extends ImageView {

   public RectRoundedImageView(Context context, AttributeSet attrs,
           int defStyleAttr) {
       super(context, attrs, defStyleAttr);
       // TODO Auto-generated constructor stub
   }

   public RectRoundedImageView(Context context, AttributeSet attrs) {
       super(context, attrs);
       // TODO Auto-generated constructor stub
   }

   public RectRoundedImageView(Context context) {
       super(context);
       // TODO Auto-generated constructor stub
   }

   public int dip2px(Context context, float dpValue) {
       final float scale = context.getResources().getDisplayMetrics().density;
       return (int) (dpValue * scale + 0.5f);
   }

   public Bitmap drawableToBitmap(Drawable drawable) {

       Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
               drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
       Canvas canvas = new Canvas(bitmap);
       drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),
               drawable.getIntrinsicHeight());
       drawable.draw(canvas);
       return bitmap;

   }

   private float xRadius = 30;
   private float yRadius = 30;
   private Paint imgPaint;
   private boolean isRadiusTopLeft = true;
   private boolean isRadiusTopRight = false;
   private boolean isRadiusBottomLeft = true;
   private boolean isRadiusBottomRight = false;

   // @Override
   // protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
   // // TODO Auto-generated method stub
   // super.onMeasure(widthMeasureSpec, heightMeasureSpec);
   // postInvalidate();
   // }

   @Override
   protected void onDraw(Canvas canvas) {
       // super.onDraw(canvas);
       Drawable mDrawable = getDrawable();
       if (mDrawable == null) {
           return;
       }

       if (mDrawable.getIntrinsicWidth() <= 0
               || mDrawable.getIntrinsicHeight() <= 0) {
           return; // nothing to draw (empty bounds)
       }
       int w = getWidth();
       int h = getHeight();

       if (imgPaint == null) {
           initBitPaint(mDrawable);
//           if(eraserPaint==null){
//               initEraserPaint();
//           }
       }

       RectF rectF = new RectF(0, 0, w, h);
       int layerId = canvas.saveLayer(rectF, null, Canvas.ALL_SAVE_FLAG);

       canvas.drawRoundRect(rectF, xRadius, yRadius, imgPaint);

       if (!isRadiusTopLeft) {
           canvas.drawRect(0, 0, xRadius, yRadius, eraserPaint);
//           canvas.drawRect(0, 0, xRadius, yRadius, imgPaint);
       }
       if (!isRadiusTopRight) {
           canvas.drawRect(rectF.right - xRadius, 0, rectF.right, yRadius,
                   eraserPaint);
//           canvas.drawRect(rectF.right - xRadius, 0, rectF.right, yRadius,
//                   imgPaint);
       }
       if (!isRadiusBottomLeft) {
           canvas.drawRect(0, rectF.bottom - yRadius, xRadius, rectF.bottom,
                   eraserPaint);
//           canvas.drawRect(0, rectF.bottom - yRadius, xRadius, rectF.bottom,
//                   imgPaint);
       }
       if (!isRadiusBottomRight) {
           canvas.drawRect(rectF.right - xRadius, rectF.bottom - yRadius,
                   rectF.right, rectF.bottom, eraserPaint);
//           canvas.drawRect(rectF.right - xRadius, rectF.bottom - yRadius,
//                   rectF.right, rectF.bottom, imgPaint);
       }
       canvas.restoreToCount(layerId);
   }

   public void initBitPaint(Drawable mDrawable) {
       Bitmap imgBitmap = drawableToBitmap(mDrawable);
       BitmapShader mShader = new BitmapShader(imgBitmap, TileMode.REPEAT,
               TileMode.REPEAT);
       imgPaint = new Paint();
       imgPaint.setAntiAlias(true);
       imgPaint.setShader(mShader);

       eraserPaint = new Paint();
       eraserPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_ATOP));
       eraserPaint.setAntiAlias(true);
       eraserPaint.setShader(mShader);
//       setLayerType(View.LAYER_TYPE_SOFTWARE, null);
   }

   private Paint eraserPaint;

}

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