我正在使用这个非常普通的课程来圆角：
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,int pixels) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),bitmap
.getHeight(),Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0,bitmap.getWidth(),bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = pixels;
paint.setAntiAlias(true);
canvas.drawARGB(0,0);
paint.setColor(color);
canvas.drawRoundRect(rectF,roundPx,paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap,rect,paint);
return output;
}
解决方法
这可能不是最有效的方法,但您可以通过在当前面具上绘画来填充圆角.您可以从当前代码开始,然后在适当的区域(角落)上使用canvas.drawRect(在调用canvas.drawRoundRect之后).我想像这样的东西只围绕左上角：
public static Bitmap getRoundedTopLeftCornerBitmap(Bitmap bitmap,int pixels) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),bitmap
.getHeight(),Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0,bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = pixels;
final Rect topRightRect = new Rect(bitmap.getWidth()/2,bitmap.getHeight()/2);
final Rect bottomRect = new Rect(0,bitmap.getHeight()/2,bitmap.getHeight());
paint.setAntiAlias(true);
canvas.drawARGB(0,0);
paint.setColor(color);
canvas.drawRoundRect(rectF,paint);
// Fill in upper right corner
canvas.drawRect(topRightRect,paint);
// Fill in bottom corners
canvas.drawRect(bottomRect,paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap,paint);
return output;
}
如果您愿意,可以在这里进行一些优化,但我认为它应该可行.一般的想法肯定应该.我没有尝试或测试过此代码,如果像素>它看起来不正确bitmap.getWidth()/ 2或像素> bitmap.getHeight()/ 2.然后,这也可能是真的.
