android 利用Bitmap获取圆角矩形、圆形图片

1.在很多时候，我们要显示图片资源，需要将他的资源显示为圆角的；示例源码如下：

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPx){    

        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, 0, bitmap.getWidth(), bitmap.getHeight());
        final RectF rectF = new RectF(rect);    

        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint); 

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);    

        return output;
    }    

注意：bitmap为图片资源；roundPx圆角的角度值float;

2.得到圆形资源图片。

public static Bitmap getOvalBitmap(Bitmap bitmap){    

        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, 0, bitmap.getWidth(), bitmap.getHeight()); 

        final RectF rectF = new RectF(rect); 

        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);    

        canvas.drawOval(rectF, paint);

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);
        return output;
    }    

注：以上代码均经测试实用，复制即可使用；如有问题请留言交谈；