Android：在外部存储设备上保存图像的最佳方法

Question

When i'm trying to save an image at some devices the app crashes. After some research i think the problem is the imageRoot, but i'm kind of lost with so many solutions... I think the problem is about obtaining external storage path. The device i'm using to test my app doesn't have any sd card, the path is /mnt/sdcard/Pictures and the image is being saved successfully. I want it to work whether phone has an sd card or not. Thanks for any help in advance.

imageRoot=new File(Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_PICTURES), "AppName");

private void saveImage() {


        Bitmap bitmap = sqimage.getDrawingCache();
        File image = new File(imageRoot, imageName);



        if (image.exists()) {
            image.delete();

        }

        try {
            FileOutputStream output = new FileOutputStream(image);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, output);
            output.flush();
            output.close();
            new SingleMediaFileConnector(getActivity().getApplicationContext(), image);

        } catch (FileNotFoundException e) {
            e.printStackTrace();
            success = false;
        } catch (IOException e) {
            e.printStackTrace();
            success = false;
        }
  }

Answer 1

Sometimes getExternalStoragePublicDirectory path doesn't exist. You need to check for its existence.

try {
    imageRoot=new File(Environment.getExternalStoragePublicDirectory(
        Environment.DIRECTORY_PICTURES), "AppName");
    File image = new File(imageRoot, imageName);

    // Make sure the Pictures directory exists.
    imageRoot.mkdirs();

    // Other stuffs here

} catch (IOException e) {
    // Unable to create file, likely because external storage is
    // not currently mounted.
    Log.w("ExternalStorage", "Error writing " + file, e);
}

See here for more details.

[Edit]
An alternate way can be use:

getExternalFilesDir(Environment.DIRECTORY_PICTURES);