Firestore getProductID cannot be null error

Question

I am trying to use the new Firestore released by Firebase in my android app. Unfortunately I keep getting this error when trying to write to the database.

public class MainActivity extends AppCompatActivity {  EditText txtName,txtSurname;  @Override protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     Toolbar toolbar =  findViewById(R.id.toolbar);     setSupportActionBar(toolbar);      txtName = findViewById(R.id.Name);     txtSurname = findViewById(R.id.Surname);      FloatingActionButton fab = findViewById(R.id.fab);     fab.setOnClickListener(new View.OnClickListener() {         @Override         public void onClick(View view) {              FirebaseFirestore db = FirebaseFirestore.getInstance();              Map<String, Object> user = new HashMap<>();             user.put("first", "Ada");             user.put("last", "Lovelace");             user.put("born", 1815);              db.collection("users")                     .add(user)                     .addOnSuccessListener(new OnSuccessListener<DocumentReference>() {                         @Override                         public void onSuccess(DocumentReference documentReference) {                             //Log.d(TAG, "DocumentSnapshot added with ID: " + documentReference.getId());                         }                     })                     .addOnFailureListener(new OnFailureListener() {                         @Override                         public void onFailure(@NonNull Exception e) {                             //Log.w(TAG, "Error adding document", e);                         }                     });          }     }); } 

This is the error I keep getting. I have added the project to my android app via the assistant. So there shouldn't be an issue.

Process: damn.testapp, PID: 2622
java.lang.IllegalArgumentException: FirebaseOptions.getProjectId() cannot be null at com.google.firebase.firestore.FirebaseFirestore.zze(Unknown Source) at com.google.firebase.firestore.FirebaseFirestore.getInstance(Unknown Source) at damn.testapp.MainActivity$1.onClick(MainActivity.java:44) at android.view.View.performClick(View.java:5637) at android.view.View$PerformClick.run(View.java:22429) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

Any help would be greatly appreciated.

Here is my security rules for the database

service cloud.firestore {   match /databases/{database}/documents { match /{document=**} {   allow read, write;     }   } } 

And this is the dependency I am using:

    compile 'com.google.firebase:firebase-firestore:11.4.2' 

Answer 1

I had the same problem. Solved with this in gradle : 3.0.0 to 3.1.0

buildscript {     dependencies {         classpath 'com.google.gms:google-services:3.1.0'     } } 

Answer 2

This failure can happen if you have a google-services.json file but it doesn't have a project_id key in the project_info section.

This could happen if you're adding Firestore to an existing app with an older google-services.json file. Project ID is a relatively new field in this file, added to support Firestore.

Sign into the Firebase console, find your app in there, re-download the google-services.json file, replace it in your project, and you should be good to go.