圆角图标

public static Bitmap getCircleBitmap( Bitmap sourceBitmap) {

        if(null == sourceBitmap) {

            return null;

        }

        

        Bitmap output = Bitmap.createBitmap(sourceBitmap.getWidth(), sourceBitmap.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, sourceBitmap.getWidth(), sourceBitmap.getHeight());

        paint.setAntiAlias(true);

        canvas.drawARGB(0, 0, 0, 0);

        paint.setColor(color);

        canvas.drawCircle(sourceBitmap.getWidth() / 2, sourceBitmap.getHeight() / 2, sourceBitmap.getWidth() / 2, paint);

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

        canvas.drawBitmap(sourceBitmap, rect, rect, paint);

        return output;

    }

    public static Bitmap getRoundedCornerBitmap(Context context, Bitmap bitmap) {

        if (null == bitmap) {

            return null;

        }

        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);

        // 得到画布

        Canvas canvas = new Canvas(output);

        // 将画布的四角圆化

        final int color = Color.RED;

        final Paint paint = new Paint();

        // 得到与图像相同大小的区域 由构造的四个值决定区域的位置以及大小

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

        final RectF rectF = new RectF(rect);

        // 值越大角度越明显

        float desity = context.getResources().getDisplayMetrics().density;

        final float roundPx = 20 * desity;

        paint.setAntiAlias(true);

        canvas.drawARGB(0, 0, 0, 0);

        paint.setColor(color);

        // drawRoundRect的第2,3个参数一样则画的是正圆的一角，如果数值不同则是椭圆的一角

        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

        canvas.drawBitmap(bitmap, rect, rect, paint);

        return output;

    }