FirebaseUser user = firebaseAuth.getCurrentUser();

if (user != null) {

// User is signed in

Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());

} else {

// User is signed out

Log.d(TAG, "onAuthStateChanged:signed_out");

}

// [START_EXCLUDE]

updateUI(user);

// [END_EXCLUDE]

hideProgressDialog();

String Email=user.getEmail();

String Uid= user.getUid();

super.onStop();

if (mAuthListener != null) {

mAuth.removeAuthStateListener(mAuthListener);

}

showProgressDialog();

// [START signin_anonymously]

mAuth.signInAnonymously()

.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {

@Override

public void onComplete(@NonNull Task<AuthResult> task) {

Log.d(TAG, "signInAnonymously:onComplete:" + task.isSuccessful());

// If sign in fails, display a message to the user. If sign in succeeds

// the auth state listener will be notified and logic to handle the

// signed in user can be handled in the listener.

if (!task.isSuccessful()) {

Log.w(TAG, "signInAnonymously", task.getException());

Toast.makeText(MainActivity.this, "Authentication failed.",

Toast.LENGTH_SHORT).show();

}

// [START_EXCLUDE]

hideProgressDialog();

// [END_EXCLUDE]

}

});

// [END signin_anonymously]

// Get email and password from form

String email = "User_Email";

String password ="User_Password";

// Create EmailAuthCredential with email and password

AuthCredential credential = EmailAuthProvider.getCredential(email, password);

// Link the anonymous user to the email credential

showProgressDialog();

// [START link_credential]

mAuth.getCurrentUser().linkWithCredential(credential)

.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {

@Override

public void onComplete(@NonNull Task<AuthResult> task) {

Log.d(TAG, "linkWithCredential:onComplete:" + task.isSuccessful());

// If sign in fails, display a message to the user. If sign in succeeds

// the auth state listener will be notified and logic to handle the

// signed in user can be handled in the listener.

if (!task.isSuccessful()) {

Toast.makeText(MainActivity.this, "Authentication failed.",

Toast.LENGTH_SHORT).show();

}

// [START_EXCLUDE]

hideProgressDialog();

// [END_EXCLUDE]

}

});

// [END link_credential]

if (mProgressDialog == null) {

mProgressDialog = new ProgressDialog(this);

mProgressDialog.setMessage(getString(R.string.loading));

mProgressDialog.setIndeterminate(true);

}

mProgressDialog.show();

if (mProgressDialog != null && mProgressDialog.isShowing()) {

mProgressDialog.dismiss();

}

super.onStop();

hideProgressDialog();

}