AbAppletic AbAppletic - 2 months ago 60
Android Question

How to properly sign out of Facebook on Android with Firebase?

So I figured out how to properly signout with Google. Cool. Now, what about Facebook?

When I get an error signing in to Facebook, such as an error indicating I already have a Firebase account with the same credentials but a different social provider, I get the "Log out of facebook" button. To be more clear:

I try logging into Facebook, then I get an error (this isn't my problem!), but the problem is, Facebook's button is now on "Log out". When it should still be "Sign In With Facebook". I know why this is happening; it's because the error is with Firebase and Facebook thinks I'm signed in.

But the real question is, how do I properly sign out of Facebook?

FirebaseAuth.getInstance().signout()
doesn't seem to logout of Facebook itself.

Here's my current
logout()
method:

static void logOut(final Context context) {
new SweetAlertDialog(context, SweetAlertDialog.WARNING_TYPE)
.showCancelButton(true)
.setTitleText(context.getString(R.string.areYouSure))
.setContentText(context.getString(R.string.logoutMSG))
.setCancelText(context.getString(android.R.string.no))
.setCancelClickListener(new SweetAlertDialog.OnSweetClickListener() {
@Override
public void onClick(SweetAlertDialog sweetAlertDialog) {
sweetAlertDialog.dismiss();
}
})
.setConfirmText(context.getString(R.string.yes))
.setConfirmClickListener(new SweetAlertDialog.OnSweetClickListener() {
@Override
public void onClick(final SweetAlertDialog sweetAlertDialog) {
//region Google
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(context.getString(R.string.default_web_client_id))
.requestEmail()
.build();
final GoogleApiClient mGoogleApiClient = new GoogleApiClient.Builder(context)
.enableAutoManage((FragmentActivity) context, new GoogleApiClient.OnConnectionFailedListener() {
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
FirebaseCrash.log(connectionResult.getErrorMessage());
Toast.makeText(context, context.getString(R.string.error), Toast.LENGTH_SHORT).show();
}
})
.addApi(Auth.GOOGLE_SIGN_IN_API, gso)
.build();
mGoogleApiClient.registerConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks() {@
Override
public void onConnected(@Nullable Bundle bundle) {

FirebaseAuth.getInstance().signOut();
if (mGoogleApiClient.isConnected()) {
Auth.GoogleSignInApi.signOut(mGoogleApiClient).setResultCallback(new ResultCallback < Status > () {@
Override
public void onResult(@NonNull Status status) {
if (status.isSuccess()) {
FirebaseAuth.getInstance().signOut();
sweetAlertDialog.dismiss();
Log.d(TAG, "User Logged out");
Intent intent = new Intent(context, SignUp.class);
context.startActivity(intent);
((FragmentActivity) context).finish();
} else
Toast.makeText(context, context.getString(R.string.error), Toast.LENGTH_SHORT).show();
}
});
}
}

@
Override
public void onConnectionSuspended(int i) {
Log.e(TAG, "Google API Client Connection Suspended");
}
});
//endregion
}
}).show();
}

Answer

I had a similar problem and got it solved using both the firebase Auth instance and the facebook LoginManager instance

FirebaseAuth.getInstance().signOut();
LoginManager.getInstance().logOut();

My Question