Android：如何以编程方式仅舍入位图的顶角？

我目前正在使用此代码：

@Override public Bitmap transform(Bitmap source) { Bitmap result = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Config.ARGB_8888); Canvas canvas = new Canvas(result); final int color = 0xff424242; final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, source.getWidth(),source.getHeight()); final RectF rectF = new RectF(rect); final float scale = context.getResources().getDisplayMetrics().density; final float roundDp = 10 * scale; paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); canvas.drawRoundRect(rectF, roundDp, roundDp, paint); paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); canvas.drawBitmap(source, rect, rect, paint); source.recycle(); return result; } 

但问题是这种方法只允许我一次修改所有4个角。 我如何只围绕图像的底角？

Answer 1

这是你的答案： https ： //stackoverflow.com/a/5252726/1969801

 public static Bitmap getRoundedCornerBitmap(Context context, Bitmap input, int pixels , int w , int h , boolean squareTL, boolean squareTR, boolean squareBL, boolean squareBR ) { Bitmap output = Bitmap.createBitmap(w, h, Config.ARGB_8888); Canvas canvas = new Canvas(output); final float densityMultiplier = context.getResources().getDisplayMetrics().density; final int color = 0xff424242; final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, w, h); final RectF rectF = new RectF(rect); //make sure that our rounded corner is scaled appropriately final float roundPx = pixels*densityMultiplier; paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); canvas.drawRoundRect(rectF, roundPx, roundPx, paint); //draw rectangles over the corners we want to be square if (squareTL ){ canvas.drawRect(0, 0, w/2, h/2, paint); } if (squareTR ){ canvas.drawRect(w/2, 0, w, h/2, paint); } if (squareBL ){ canvas.drawRect(0, h/2, w/2, h, paint); } if (squareBR ){ canvas.drawRect(w/2, h/2, w, h, paint); } paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); canvas.drawBitmap(input, 0,0, paint); return output; } 

和onDrawfunction：

  @Override protected void onDraw(Canvas canvas) { //super.onDraw(canvas); Drawable drawable = getDrawable(); Bitmap b = ((BitmapDrawable)drawable).getBitmap() ; Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true); int w = getWidth(), h = getHeight(); Bitmap roundBitmap = CropImageView.getRoundedCornerBitmap( getContext(), bitmap,10 , w, h , true, false,true, false); canvas.drawBitmap(roundBitmap, 0,0 , null); }