Android - Storage activity result returning null

Question

I wrote a code that the user can take a picture or choose from his libary. I used intent to open the gallery/camera, it returns the bitmap or the path of the file from the gallery. The data that i received i try to save it on interface but for some reason it always crash because its get null.

I dont understand how the interface gets null if it actually get the bitmap/file path.

CODE

     public class ChangeProfileImgDialog extends DialogFragment {

private static final String TAG = "ChangePhotoDialog";

public static final int  CAMERA_REQUEST_CODE = 1;//random number
public static final int PICKFILE_REQUEST_CODE = 0;//random number

public ChangeProfileImgDialog() {
    // Required empty public constructor
}

public interface OnPhotoReceivedListener{
    public void getImagePath(Uri imagePath);
    public void getImageBitmap(Bitmap bitmap);
}

OnPhotoReceivedListener mOnPhotoReceived;


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.fragment_change_profile_img_dialog, container, false);

    //Initialize the textview for choosing an image from memory
    TextView selectPhoto = (TextView) v.findViewById(R.id.dialogChoosePhoto);
    selectPhoto.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.d(TAG, "onClick: accessing phones memory.");
            Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
            intent.setType("image/*");
            startActivityForResult(intent, PICKFILE_REQUEST_CODE);
        }
    });


    //Initialize the textview for choosing an image from memory
    TextView takePhoto = (TextView) v.findViewById(R.id.dialogOpenCamera);
    takePhoto.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.d(TAG, "onClick: starting camera");
            Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            startActivityForResult(cameraIntent, CAMERA_REQUEST_CODE);
        }
    });

    return v;

}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    /*
    Results when selecting new image from phone memory
     */
    if(requestCode == PICKFILE_REQUEST_CODE && resultCode == Activity.RESULT_OK){
        Uri selectedImageUri = data.getData();
        Log.d(TAG, "onActivityResult: image: " + selectedImageUri);

        //send the uri and fragment to the interface
        mOnPhotoReceived.getImagePath(selectedImageUri);
        getDialog().dismiss();

    }

    else if(requestCode == CAMERA_REQUEST_CODE && resultCode == Activity.RESULT_OK){
        Log.d(TAG, "onActivityResult: done taking a photo.");

        Bitmap bitmap;
        bitmap = (Bitmap) data.getExtras().get("data");
        //send the bitmap and fragment to the interface
        mOnPhotoReceived.getImageBitmap(bitmap);
        getDialog().dismiss();
    }
}

@Override
public void onAttach(Context context) {
    try{
        mOnPhotoReceived = (OnPhotoReceivedListener) getActivity();
    }catch (ClassCastException e){
        Log.e(TAG, "onAttach: ClassCastException", e.getCause() );
    }
    super.onAttach(context);
   }

 }

The device that i run the app is Xiaomi A1 - i dont know if it is related.

EDIT

I have resolve the problem by implement the interface in "MainActivity" and call the func of the interface and pass the data and it work!

    //transfer the imagepath to MyAccountFragment
@Override
public void getImagePath(Uri imagePath) {
    Log.d(TAG,imagePath.toString());
    MyAccountFragment fragment = new MyAccountFragment();
    fragment.getImagePath(imagePath);
}

//transfer the bitmap to MyAccountFragment
@Override
public void getImageBitmap(Bitmap bitmap) {
    Log.d(TAG,bitmap.toString());
    MyAccountFragment fragment = new MyAccountFragment();
    fragment.getImageBitmap(bitmap);
}

Thats all i needed to do

Answer 1

Your MainActivity(Activity on which all fragments rely) need to implement the interface which you need use in the Fragment

Now the problem is that how you will transfer data from Activity to Fragment for which, you need to use the findFragmentById method of the Fragment, have a look on the example on which i have transferred the data from Activity to Fragment

public class MainActivity extends AppCompatActivity implements OnPhotoReceivedListener {


    @Override
    public void getImagePath(String name) {

        YOUR_FRAGMENT fragment = (YOUR_FRAGMENT) getFragmentManager().findFragmentById(R.id.fragment_container);
        fragment.setDataForInterface(name);  //// THESE METHOD , YOU NEED TO CREATE ON THE FRAGMENT

    }
}

Inside your onCreateView , you need to initialize the OnPhotoReceivedListener interface like below

 OnPhotoReceivedListener mOnPhotoReceived;

 @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
          /**
           * This is the main error which u are doing
           */

        try {
            mOnPhotoReceived = (OnPhotoReceivedListener ) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement MyInterface ");
        }
    }

You need to create the method which will take the data from your parent Activity to Fragment

   public void setDataForInterface(String yourData) {
           /**
            * THIS IS YOUR DATA WHICH IS COME FROM THE PARENT ACTIVITY
            */
    }