Android Studio After Google Sign In

Question

Hi I used firebase login to get Google Sign in to work on my app. My group and I have been having an issue for the past couple weeks. We don't know how to change screens to a new activity after the user signs in.

This is our MainActivity.java code

 package com.plannerangelica.tmr; import android.app.ProgressDialog; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.widget.Button; import com.google.android.gms.auth.api.signin.GoogleSignInOptions; import com.google.android.gms.common.SignInButton; import com.google.android.gms.common.api.GoogleApiClient; import com.google.firebase.auth.FirebaseAuth; import com.google.firebase.auth.FirebaseUser; import static com.plannerangelica.tmr.R.styleable.View; public class MainActivity extends AppCompatActivity { // Firebase instance variables private FirebaseAuth mFirebaseAuth; private FirebaseUser mFirebaseUser; public static final String ANONYMOUS = "anonymous"; private String mUsername; private String mPhotoUrl; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // add these just after setContentView(R.layout.activity_main); // Initialize Firebase Auth mUsername = ANONYMOUS; mFirebaseAuth = FirebaseAuth.getInstance(); mFirebaseUser = mFirebaseAuth.getCurrentUser(); if (mFirebaseUser == null) { // Not signed in, launch the Sign In activity startActivity(new Intent(this, SignInActivity.class)); finish(); return; } else { mUsername = mFirebaseUser.getDisplayName(); if (mFirebaseUser.getPhotoUrl() != null) { mPhotoUrl = mFirebaseUser.getPhotoUrl().toString(); } Log.i("User Name:", mUsername); } } }

and SignInActivity.java

 package com.plannerangelica.tmr; import android.content.Intent; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.widget.Toast; import com.google.android.gms.auth.api.Auth; import com.google.android.gms.auth.api.signin.GoogleSignInAccount; import com.google.android.gms.auth.api.signin.GoogleSignInOptions; import com.google.android.gms.auth.api.signin.GoogleSignInResult; import com.google.android.gms.common.ConnectionResult; import com.google.android.gms.common.SignInButton; import com.google.android.gms.common.api.GoogleApiClient; import com.google.android.gms.tasks.OnCompleteListener; import com.google.android.gms.tasks.Task; import com.google.firebase.auth.AuthCredential; import com.google.firebase.auth.AuthResult; import com.google.firebase.auth.FirebaseAuth; import com.google.firebase.auth.FirebaseUser; import com.google.firebase.auth.GoogleAuthProvider; public class SignInActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener, View.OnClickListener { private static final String TAG = "SignInActivity"; private static final int RC_SIGN_IN = 9001; private SignInButton mSignInButton; private GoogleApiClient mGoogleApiClient; private FirebaseAuth mFirebaseAuth; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_sign_in); // Assign fields mSignInButton = (SignInButton) findViewById(R.id.sign_in_button); // Set click listeners mSignInButton.setOnClickListener(this); GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN) .requestIdToken(getString(R.string.default_web_client_id)) .requestEmail() .build(); mGoogleApiClient = new GoogleApiClient.Builder(this) .enableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */) .addApi(Auth.GOOGLE_SIGN_IN_API, gso) .build(); // Initialize FirebaseAuth mFirebaseAuth = FirebaseAuth.getInstance(); } private void handleFirebaseAuthResult(AuthResult authResult) { if (authResult != null) { // Welcome the user FirebaseUser user = authResult.getUser(); Toast.makeText(this, "Welcome " + user.getEmail(), Toast.LENGTH_SHORT).show(); // Go back to the main activity startActivity(new Intent(this, MainActivity.class)); } } @Override public void onClick(View v) { switch (v.getId()) { case R.id.sign_in_button: signIn(); break; default: return; } } private void signIn() { Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient); startActivityForResult(signInIntent, RC_SIGN_IN); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...); if (requestCode == RC_SIGN_IN) { GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data); if (result.isSuccess()) { // Google Sign In was successful, authenticate with Firebase GoogleSignInAccount account = result.getSignInAccount(); firebaseAuthWithGoogle(account); } else { // Google Sign In failed Log.e(TAG, "Google Sign In failed."); } } } private void firebaseAuthWithGoogle(GoogleSignInAccount acct) { Log.d(TAG, "firebaseAuthWithGoogle:" + acct.getId()); AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null); mFirebaseAuth.signInWithCredential(credential) .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() { @Override public void onComplete(@NonNull Task<AuthResult> task) { Log.d(TAG, "signInWithCredential: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, "signInWithCredential", task.getException()); Toast.makeText(SignInActivity.this, "Authentication failed.", Toast.LENGTH_SHORT).show(); } else { startActivity(new Intent(SignInActivity.this, MainActivity.class)); finish(); } } }); } @Override public void onConnectionFailed(@NonNull ConnectionResult connectionResult) { // An unresolvable error has occurred and Google APIs (including Sign-In) will not // be available. Log.d(TAG, "onConnectionFailed:" + connectionResult); Toast.makeText(this, "Google Play Services error.", Toast.LENGTH_SHORT).show(); } }

and activity_sign_in.xml

 <?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/sign_in_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="30sp" android:layout_gravity="center_horizontal" android:layout_marginTop="40dp" android:text="sign_in"/> <com.google.android.gms.common.SignInButton android:id="@+id/sign_in_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:visibility="visible" android:layout_gravity="center"/> </FrameLayout>

Answer 1

Use this

  startActivity(new Intent(this, activity_sign_in.class));

after the user is signed in ie inside this

else {
            mUsername = mFirebaseUser.getDisplayName();
            if (mFirebaseUser.getPhotoUrl() != null) {
                mPhotoUrl = mFirebaseUser.getPhotoUrl().toString();
            }
            Log.i("User Name:", mUsername);
        }