Android Camera OnActivityResult resets photo path to null

问题

I'm having a problem while testing my app on a friends Galaxy S4 (GT i9505, Android 5.1). When giving a file URI to camera intent, OnActivityResult gives result Activity.RESULT_OK and and the path is null. It is working on most of other devices I tested (LG G3, nexus 5...). This is my code:

GetOutputMediaFile

public File getOutputMediaFile(int type){
    File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM), MediaChooserConstants.folderName);
    if (! mediaStorageDir.exists()){
        if (! mediaStorageDir.mkdirs()){
            return null;
        }
    }

    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File mediaFile;
    if (type == MediaChooserConstants.MEDIA_TYPE_IMAGE){
        mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");
    } else if(type == MediaChooserConstants.MEDIA_TYPE_VIDEO) {
        mediaFile = new File(mediaStorageDir.getPath() + File.separator + "VID_" + timeStamp + ".mp4");
    } else {
        return null;
    }
    return mediaFile;
}

OnActivityResult

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == Activity.RESULT_OK) {
        String picturePath = null;
        if (requestCode == MediaChooserConstants.CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
            picturePath = fileUri.getPath(); // <--- fileURI is null
        }
    }
}

DispatchTakePhotoIntent

private void dispatchTakePictureIntent() {
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    File file = Utils.getInstance().getOutputMediaFile(MediaChooserConstants.MEDIA_TYPE_IMAGE);

    fileUri = Uri.fromFile(file); // create a file to save the image
    intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); // set the image file name

    //fileUri is not null here while debugging (../DCIM/.../IMG_XXX.jpg)
    startActivityForResult(intent, MediaChooserConstants.CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);

}

回答1:

you need to save the file path to the bundle in onSaveInstanceState and then get it again in onRestoreInstanceState from the bundle

回答2:

Save path of image like this :

@Override
protected void onSaveInstanceState(Bundle savedInstanceState) {

    if(mImageCaptureUri!=null)
        savedInstanceState.putString("camera_image", mImageCaptureUri.toString());

    super.onSaveInstanceState(savedInstanceState);
}

And Retrieve image path from this :

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {

    if (savedInstanceState != null) {
        if (savedInstanceState.containsKey("camera_image")) {
            mImageCaptureUri = Uri.parse(savedInstanceState.getString("camera_image"));
        }
    }

    super.onRestoreInstanceState(savedInstanceState);
}

This problem happens, Only when user goes to camera intent and by the time he captures the image the activity on which camera intent was hosted gets destroyed or recreated when user comes back from the camera intent.

来源：https://stackoverflow.com/questions/32722402/android-camera-onactivityresult-resets-photo-path-to-null

标签

android

nullpointerexception

android-camera

uri

onactivityresult