Android 圆角ImageView

@Overrideprotected void onDraw(Canvas canvas) {// Round some corners betch!Drawable drawable = getDrawable();if (drawable == null) {return;}if (getWidth() == 0 || getHeight() == 0) {return;}this.measure(0, 0);if (drawable.getClass() == NinePatchDrawable.class)return;Bitmap b;if (drawable instanceof BitmapDrawable) {b = ((BitmapDrawable) drawable).getBitmap();} else {Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),Config.ARGB_8888);Canvas myCanvas = new Canvas(bitmap);drawable.setBounds(0, 0, myCanvas.getWidth(), myCanvas.getHeight());drawable.draw(canvas);b = bitmap;}if (b == null) {return;}Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);int w = getWidth(), h = getHeight();int radius = (w < h ? w : h) / 2 - mBorderThickness;Bitmap roundBitmap = getCroppedBitmap(bitmap, radius);if (mPaint == null) {mPaint = new Paint();mPaint.setAntiAlias(true);mPaint.setFilterBitmap(true);mPaint.setDither(true);mPaint.setColor(mBorderColor);}canvas.drawCircle(w / 2,h / 2, radius + mBorderThickness, mPaint);canvas.drawBitmap(roundBitmap, w / 2 - radius, h / 2 - radius, null);}private Bitmap getCroppedBitmap(Bitmap bmp, int radius) {Bitmap scaledSrcBmp;int diameter = radius * 2;if (bmp.getWidth() != diameter || bmp.getHeight() != diameter)scaledSrcBmp = Bitmap.createScaledBitmap(bmp, diameter, diameter, false);elsescaledSrcBmp = bmp;Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(), scaledSrcBmp.getHeight(),Config.ARGB_8888);Canvas canvas = new Canvas(output);final Paint paint = new Paint();final Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(), scaledSrcBmp.getHeight());paint.setAntiAlias(true);paint.setFilterBitmap(true);paint.setDither(true);canvas.drawARGB(0, 0, 0, 0);paint.setColor(Color.parseColor("#BAB399"));canvas.drawCircle(scaledSrcBmp.getWidth() / 2,scaledSrcBmp.getHeight() / 2, scaledSrcBmp.getWidth() / 2, paint);paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);return output;}

复写ImageView，实现onDraw