android 圆角图片的实现

图片展示的时候总觉的直角的图片不好看？好办法来了！～～

public class ToRoundCorner extends Activity{

    public Bitmap toRoundCorner(Bitmap bitmap, int pixels) {

        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.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);
        final float roundPx = pixels;
        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);
        return output;
    }

}

把上面的代码放到工具包中需要的时候只要调用下就好了！

ImageView pic = (ImageView) navigationView.getHeaderView(0).findViewById(R.id.tou_pic);
        TextView username = (TextView) navigationView.getHeaderView(0).findViewById(R.id.nav_username);
        TextView phone = (TextView) navigationView.getHeaderView(0).findViewById(R.id.nav_phone);

        //将图片转换成bitmap
        Drawable drawable = getResources().getDrawable(R.mipmap.aboutus);
        BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
        Bitmap bitmap = bitmapDrawable.getBitmap();
        //将图片转成圆角
        ToRoundCorner toround = new ToRoundCorner();
        pic.setImageBitmap(toround.toRoundCorner(bitmap , 50));

用法很简单是不是？ 其中最后一行toround.toRoundCorner(bitmap , 50)中bitmap 是要传入的图片，后一个数字越大图片圆角越明显。

方法摘自：脚本之家（http://www.jb51.net/article/32320.htm）