Android中如何生成带圆角的Bitmap图片

有时候我们在开发Android应用时，会遇到圆角图片的问题，那么，我们如何在Android中用代码来生成圆角Bitmap图片呢？下面这段代码也许能够帮到你。

该方法主要用到了drawRoundRect来画圆角矩形，然后通过drawBitmap来画图片。

//生成圆角图片
public static Bitmap GetRoundedCornerBitmap(Bitmap bitmap) {
    try {
        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(new Rect(0, 0, bitmap.getWidth(),
                bitmap.getHeight()));
        final float roundPx = 14;
        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(Color.BLACK);       
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));            
 
        final Rect src = new Rect(0, 0, bitmap.getWidth(),
                bitmap.getHeight());
         
        canvas.drawBitmap(bitmap, src, rect, paint);   
        return output;
    } catch (Exception e) {        
        return bitmap;
    }
}