我需要围绕位图的角落。之后,我需要为它添加边框。我已经完成了下面的源代码来圆角,但我不知道如何使用画布在位图中绘制边框。有什么办法可以做到吗?由于如何使用画布在位图中绘制笔画?
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
canvas.drawRoundRect(rectF, 20.0f, 20.0f, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
我已经加入去解决方案:
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
Paint paint = new Paint();
Paint paintStroke = new Paint();
paintStroke.setStrokeWidth(2);
paintStroke.setStyle(Paint.Style.STROKE);
paintStroke.setColor(Color.RED);
paintStroke.setAntiAlias(true);
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
canvas.drawRoundRect(rectF, 20.0f, 20.0f, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
canvas.drawRoundRect(rectF, round, round, paintStroke);
return output;
这行代表canvas.drawRoundRect(rectF,20.0f,20.0f,paint); ? – ingsaurabh 2011-05-31 10:19:30