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我正在尝试为我的 android 应用程序中的图像添加圆角。我用于添加圆角的代码是：

    Uri selectedImage = data.getData();
    String[] filePathColumn = { MediaStore.Images.Media.DATA };

    Cursor cursor = getContentResolver().query(selectedImage,
            filePathColumn, null, null, null);
    cursor.moveToFirst();

    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
    picturePath = cursor.getString(columnIndex);
    cursor.close();

    final ImageView imageView = (ImageView) findViewById(R.id.imageView1);
    final SeekBar cornerRadius = (SeekBar) findViewById(R.id.seekBar1);
    final TextView tip = (TextView) findViewById(R.id.tip);

    bm = getRoundedCornerBitmap(BitmapFactory.decodeFile(picturePath),
            cornerRadius.getProgress());
     imageView.setImageBitmap(bm);

上面的圆角半径是从 seekbar 的值中得到的。

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
    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);
    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(Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint);

    return output;
}

我在单击保存按钮时调用的将图片保存到 sd 卡的代码是：

        OutputStream fOut = null;
        File file = new File(picturePath);
        try {
            fOut = new FileOutputStream(file);
        } catch (FileNotFoundException e) {

            e.printStackTrace();
        }
        bm.compress(Bitmap.CompressFormat.JPEG, 85, fOut);
        sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri
                .parse("file://"
                        + Environment.getExternalStorageDirectory())));

        Toast.makeText(MainActivity.this,
                "Pic save successfuly. Path : " + picturePath,
                Toast.LENGTH_SHORT).show();

我面临的问题是，一旦将图像编辑为圆角。下一次，我打开相同的图像并尝试使用不同的圆角半径值保存不会保存图像。我确实第二次收到上述 Toast 消息，但图像保持不变。

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1 回答 1

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得到它的工作。读写权限被搞砸了。

于 2013-08-21T09:13:18.367 回答