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    //Save selected image to FirebaseStorage in following directory: images > UUID
    //On successful upload, save to the realtime FirebaseDatabase in following directory: users > loggedinuser UUID > snaps > UUID > imageURL: value
    
    
    //getPhoto via in-built intent
    public void getPhoto() {
        Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(intent, 1);
    }
    
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        Uri selectedImage = data.getData();
        if (requestCode == 1 && resultCode == RESULT_OK && data != null) {
            try {
                String _imageName = UUID.randomUUID().toString() + ".jpg";
                Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), selectedImage);
                Log.i("image selected", "got image");
                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
                byte[] byteArray = stream.toByteArray();

                UploadTask uploadTask = FirebaseStorage.getInstance().getReference().child("images").child(_imageName).putBytes(byteArray);
                uploadTask.addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception exception) {
                        Toast.makeText(UserListActivity.this, "Upload failed", Toast.LENGTH_SHORT).show();
                    }
                }).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                    @Override
                    //Get a ref to the imageURL so we can retrieve it in UserFeedActivity
                    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                        if (taskSnapshot.getMetadata() != null) {
                            if (taskSnapshot.getMetadata().getReference() != null) {
                                Task<Uri> result = taskSnapshot.getStorage().getDownloadUrl();
                                result.addOnSuccessListener(new OnSuccessListener<Uri>() {
                                    @Override
                                    public void onSuccess(Uri uri) {
                                        Map<String, String> imageMap = new HashMap<>();
                                        imageMap.put("imageURL", uri.toString());
                                        FirebaseDatabase.getInstance().getReference().child("users").child(FirebaseAuth.getInstance().getCurrentUser().getUid()).child("snaps").push().setValue(imageMap);
                                        Toast.makeText(UserListActivity.this, "Image shared!", Toast.LENGTH_SHORT).show();
                                    }
                                });
                            }
                        }
                    }
                });
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }


    //Menu item with options to 
    // 1. Share a photo 
    // 2. Logout
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == R.id.share) {
            if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
            } else {
                getPhoto();
            }
        } else if (item.getItemId() == R.id.logout) {
            _mAuth.signOut();
            finish();
            Intent intent = new Intent(getApplicationContext(), MainActivity.class);
            startActivity(intent);
        }
        return super.onOptionsItemSelected(item);
    }
    
   //Permissions
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        if (requestCode == 1) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                getPhoto();
            }
        }
    }