Android将位图保存到SD卡

private void saveBitmapToSDCard(Bitmap bitmap) {
    String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/my_image.jpg";
    try {
        File file = new File(path);
        FileOutputStream out = new FileOutputStream(file);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
        out.flush();
        out.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />