How can I solve the Android Firebase error "Default FirebaseApp is not initialised in this process"?

Question

I am using FirebaseAuth for user registration with email and password, and I have already added the plugin and dependencies in my project. MainActivity.java ``` public class MainActivity extends AppCompatActivity implements View.OnClickListener { EditText ed_email, ed_pass; Button but_login; ProgressDialog progressDialog; FirebaseAuth firebaseAuth; Context context; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); context=getApplicationContext(); FirebaseApp.initializeApp(context); firebaseAuth=FirebaseAuth.getInstance(); ed_email= (EditText) findViewById(R.id.ed_email); ed_pass= (EditText) findViewById(R.id.ed_pass); but_login= (Button) findViewById(R.id.but_login); but_login.setOnClickListener(this); progressDialog=new ProgressDialog(this); } public void registerUser(){ String email=ed_email.getText().toString().trim(); String pass=ed_pass.getText().toString().trim(); if(TextUtils.isEmpty(email)…

Accepted Answer

Double-check the following as this has worked for me:

Added in your project level gradle file:

```
buildscript {
    // ...
    dependencies {
        // ...
        classpath 'com.google.gms:google-services:3.0.0'
    }
}
```

And on your app-build gradle file:

```
apply plugin: 'com.android.application'

android {
  // ...
}

dependencies {
  // ...
  compile 'com.google.firebase:firebase-core:10.0.1'

// Getting a "Could not find" error? Make sure you have
  // the latest Google Repository in the Android SDK manager
}

// ADD THIS AT THE BOTTOM
apply plugin: 'com.google.gms.google-services' 
```

Link

How can I solve the Android Firebase error "Default FirebaseApp is not initialised in this process"?

Solution

Problem