I have implemented google sign-in with Firebase authentication in my Android app succesfully. 
As you see, I have logged-in with my account and it appears on the Firebase console.
The function firebaseAuthWithGoogle authenticates the user with Firebase after he logs-in with Google Sign-in:
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) { if (task.isSuccessful()) { // Sign in success, update UI with the signed-in user's information Log.d(TAG, "signInWithCredential:success"); final FirebaseUser user = mFirebaseAuth.getCurrentUser(); //This is to connect to the http server and save the user data in my MySql database FirebaseInstanceId.getInstance().getInstanceId().addOnSuccessListener(LoginActivity.this, new OnSuccessListener<InstanceIdResult>() { @Override public void onSuccess(InstanceIdResult instanceIdResult) { String userToken = instanceIdResult.getToken(); String uid = user.getUid(); String name = user.getDisplayName(); String email = user.getEmail(); String profileUrl = user.getPhotoUrl().toString(); String coverUrl = ""; UserInterface userInterface = ApiClient.getApiClient().create(UserInterface.class); Call<Integer> call = userInterface.signin(new LoginActivity.UserInfo(uid,name,email,profileUrl,coverUrl,userToken)); call.enqueue(new Callback<Integer>() { @Override public void onResponse(Call<Integer> call, Response<Integer> response) { progressDialog.dismiss(); Toast.makeText(LoginActivity.this,"Login succesfull AFTER API CALL",Toast.LENGTH_SHORT).show(); startActivity(new Intent(LoginActivity.this,MainActivity.class)); finish(); } @Override public void onFailure(Call<Integer> call, Throwable t) { progressDialog.dismiss(); Toast.makeText(LoginActivity.this,"Login failed AFTER API CALL",Toast.LENGTH_SHORT).show(); } }); } }); } else { // If sign in fails, display a message to the user. Log.w(TAG, "signInWithCredential:failure", task.getException()); } // ... } }); } Another thing the function firebaseAuthWithGoogle does is: Connect to the http Apache server and save the user information in a MySQL users table through this code snippet:
//This is to connect to the http server and save the user data in my MySql database FirebaseInstanceId.getInstance().getInstanceId().addOnSuccessListener(LoginActivity.this, new OnSuccessListener<InstanceIdResult>() { @Override public void onSuccess(InstanceIdResult instanceIdResult) { String userToken = instanceIdResult.getToken(); String uid = user.getUid(); String name = user.getDisplayName(); String email = user.getEmail(); String profileUrl = user.getPhotoUrl().toString(); String coverUrl = ""; UserInterface userInterface = ApiClient.getApiClient().create(UserInterface.class); Call<Integer> call = userInterface.signin(new LoginActivity.UserInfo(uid,name,email,profileUrl,coverUrl,userToken)); call.enqueue(new Callback<Integer>() { @Override public void onResponse(Call<Integer> call, Response<Integer> response) { progressDialog.dismiss(); Toast.makeText(LoginActivity.this,"Login succesfull AFTER API CALL",Toast.LENGTH_SHORT).show(); startActivity(new Intent(LoginActivity.this,MainActivity.class)); finish(); } @Override public void onFailure(Call<Integer> call, Throwable t) { progressDialog.dismiss(); Toast.makeText(LoginActivity.this,"Login failed AFTER API CALL",Toast.LENGTH_SHORT).show(); } }); } }); } So after the user has been succesfully authenticated, the call to the server fails and this line is obviously executed:
Toast.makeText(LoginActivity.this,"Login failed AFTER API CALL",Toast.LENGTH_SHORT).show(); I am using Retrofit as an http client along with okhttp as an http body interceptor to log the http requests as follows:
ApiClient.java
public static Retrofit getApiClient(){ HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY); OkHttpClient httpClient = new OkHttpClient.Builder() .addInterceptor(httpLoggingInterceptor) .build(); if(retrofit==null){ retrofit = new Retrofit.Builder().baseUrl(BASE_URL) .client(httpClient) .addConverterFactory(GsonConverterFactory.create()) .build(); } return retrofit; } } So after the Toast Text "Login failed AFTER API CALL" appears on the emulator, I have this on the log:
D/OkHttp: --> POST http://10.0.2.2/friendster/public/app/login Content-Type: application/json; charset=UTF-8 Content-Length: 413 D/OkHttp: {"CoverUrl":"","email":"[email protected]","name":"Ahmed Ghrib","profileUrl":"https://lh6.googleusercontent.com/-S8l_5gZaXJ8/AAAAAAI/AAAAAAAAAAA/ACHi3rfObo6-Ta-wxrMUvcAZ8Yg/s96-c/photo.jpg","uid":"YACACYYDcGVr26N8OHuTuQlQqvU2","userToken":"ecxdtFaKldI:APA91bHb1PAA5hU6i1oMqnSsDXXkAaXNb6dynyaYmhU_soHTWmLXud6REjCpqTjsGpgdBh1NMYUqAr3SaTUWapN4v73zkvyYD2f3yegUP3H38eeU_JtH7NOSMKbF4U"} D/OkHttp: --> END POST (413-byte body) W/e.myapplicatio: Verification of okhttp3.internal.http.ExchangeCodec okhttp3.internal.connection.RealConnection.newCodec$okhttp(okhttp3.OkHttpClient, okhttp3.Interceptor$Chain) took 134.353ms D/OkHttp: <-- HTTP FAILED: java.net.UnknownServiceException: CLEARTEXT communication to 10.0.2.2 not permitted by network security policy So I found-out that this is causing the error:
CLEARTEXT communication to 10.0.2.2 not permitted by network security policy
After going through StackOverflow, I found-out that I needed to create this file:
src/main/res/xml/network_security_config.xml
<?xml version="1.0" encoding="utf-8"?> <network-security-config> <domain-config cleartextTrafficPermitted="true"> <domain includeSubdomains="true">api.example.com(to be adjusted)</domain> </domain-config> </network-security-config> And adding this to the Manifest:
<application --- android:networkSecurityConfig="@xml/network_security_config"> Having tested my database with Postman, I am sure the problem lies in my Android project.
I thought that this should've solved the issue. But, I still have the exact same issue. I still get this error in the log:
CLEARTEXT communication to 10.0.2.2 not permitted by network security policy
