图片文件于RESULT_CANCELED

Question

I want to be able to track image file names when a picture has been taken with the default Camera Glassware. This is so I can delete them when finished. I have the following code:

        ...
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent, TAKE_PICTURE_REQUEST);
 }

 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (requestCode == TAKE_PICTURE_REQUEST && resultCode == RESULT_OK) {

            String imgPath = data.getStringExtra(Intents.EXTRA_PICTURE_FILE_PATH);
            mService.addToImageQueue(imgPath);
        }

        else if (requestCode == TAKE_PICTURE_REQUEST && resultCode == RESULT_CANCELED) {
            ...
        }
  }

If I tap, the resultCode returns RESULT_OK . When I dismiss (swipe down), I get the resultCode RESULT_CANCELED . This is how I intended it to work, except it still generates the image file even if the resultCode is RESULT_CANCELED ... I honestly feel like this might be a bug since I tried to use data.getStringExtra(Intents.EXTRA_PICTURE_FILE_PATH); and got a NullPointerException . Am I doing something wrong? Is there a way to get this file name even on RESULT_CANCELED ?

Answer 1

You could create a temporary file first (look at the createImageFile() method in this tutorial ). If successfully created, do two things:

1. Save the path of this file to a String.
2. Include this file's URI in the intent extra ( putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile)) ).

If resultCode is RESULT_CANCELED , you can now trace back to the path of the temporary file and call delete() on it.

Here is some sample code:

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_TAKE_PHOTO && resultCode == RESULT_OK) {
        Log.v("MainActivity", "Result successful.");
    } else if (requestCode == REQUEST_TAKE_PHOTO && resultCode == RESULT_CANCELED) {
        Log.v(TAG, "Result canceled. Uri of file is " + mCurrentPhotoPath);
        File file = new File(mCurrentPhotoPath);
        if (file.exists()) {
            Log.v(TAG, "File exists.");
            if(file.delete()) {
                 Log.v(TAG, "File was successfully deleted!");
            } else {
                 Log.v(TAG, "File not successfully deleted.");
            }
        } else {
            Log.v(TAG, "File does not exist!");
        }


    }
}

Note: For new File(mCurrentPhotoPath) to work, remove "file:" from the beginning of mCurrentPhotoPath .