<activity android:name=".ui.MapCustomActivity"></activity>
     <activity android:name=".ui.LoginActivity">
         <intent-filter>
             <action android:name="android.intent.action.MAIN" />

             <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
     </activity>

public class LoginActivity extends AppCompatActivity implements
    View.OnClickListener
  {
   @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);
    mEmail = findViewById(R.id.email);
    mPassword = findViewById(R.id.password);
    mProgressBar = findViewById(R.id.progressBar);

    setupFirebaseAuth();
    findViewById(R.id.email_sign_in_button).setOnClickListener(this);
    findViewById(R.id.link_register).setOnClickListener(this);

    hideSoftKeyboard();
}




private void showDialog(){
    mProgressBar.setVisibility(View.VISIBLE);

}

private void hideDialog(){
    if(mProgressBar.getVisibility() == View.VISIBLE){
        mProgressBar.setVisibility(View.INVISIBLE);
    }
}




  private void setupFirebaseAuth(){
    Log.d(TAG, "setupFirebaseAuth: started.");

    mAuthListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            FirebaseUser user = firebaseAuth.getCurrentUser();
            //user = null;
            if (user != null) {
                Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
                Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getEmail());
                Toast.makeText(LoginActivity.this, "Authenticated with: " + user.getEmail(), Toast.LENGTH_SHORT).show();

                FirebaseFirestore db = FirebaseFirestore.getInstance();
                FirebaseFirestoreSettings settings = new FirebaseFirestoreSettings.Builder()
                        .setTimestampsInSnapshotsEnabled(true)
                        .build();
                db.setFirestoreSettings(settings);

                DocumentReference userRef = db.collection(getString(R.string.collection_users))
                        .document(user.getUid());

                userRef.get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
                    @Override
                    public void onComplete(@NonNull Task<DocumentSnapshot> task) {
                        if(task.isSuccessful()){
                            Log.d(TAG, "onComplete: successfully set the user client." + task.getResult());
                            User user = task.getResult().toObject(User.class);
                            ((UserClient)(getApplicationContext())).setUser(user);
                        }
                    }
                });

                Intent intent = new Intent(LoginActivity.this, MapCustomActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                startActivity(intent);
                finish();

            } else {
                // User is signed out
                Log.d(TAG, "onAuthStateChanged:signed_out");
            }
            // ...
        }
    };
  }

public class MapCustomActivity extends AppCompatActivity {

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);

    setContentView(R.layout.activity_map_custom);

    photoview2 = (ImageView) findViewById(R.id.limerickMapImageView);
     mAvatarImage = (ImageView) findViewById(R.id.imageChooseAvatar);

    photoview2.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            ImageView view = (ImageView) v;
            view.bringToFront();
            viewTransformation(view, event);
            return true;
        }
    });
    retrieveProfileImage();

}
 private void retrieveProfileImage(){
    RequestOptions requestOptions = new RequestOptions()
            .error(R.drawable.cwm_logo)
            .placeholder(R.drawable.cwm_logo);

    int avatar = 0;

    try{

        avatar = Integer.parseInt(((UserClient)getApplicationContext()).getUser().getAvatar());
    }catch (NumberFormatException e){
        Log.e(TAG, "retrieveProfileImage: no avatar image. Setting default. " + e.getMessage() );
    }

    Glide.with(MapCustomActivity.this)
            .setDefaultRequestOptions(requestOptions)
            .load(avatar)
            .into(mAvatarImage);
}

private User user = null;

public User getUser() {
    return user;
}

public void setUser(User user) {
    this.user = user;
}