Below is my code that extracts data from firebase and stored to recycler view.
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private ArrayList<DataSetFire> arrayList;
private DatabaseReference databaseReference;
private FirebaseRecyclerOptions<DataSetFire> options;
private FirebaseRecyclerAdapter<DataSetFire, FirebaseViewHolder> adapter;
@Override
protected void onStart() {
super.onStart();
adapter.startListening();
}
@Override
protected void onStop() {
super.onStop();
adapter.stopListening();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FirebaseApp.initializeApp(this);
databaseReference = FirebaseDatabase.getInstance().getReference().child("Post");
databaseReference.keepSynced(true);
recyclerView = findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
arrayList = new ArrayList<DataSetFire>();
options = new FirebaseRecyclerOptions.Builder<DataSetFire>().setQuery(databaseReference, DataSetFire.class).build();
adapter = new FirebaseRecyclerAdapter<DataSetFire, FirebaseViewHolder>(options) {
@Override
protected void onBindViewHolder(@NonNull FirebaseViewHolder holder, int position, @NonNull DataSetFire model) {
holder.Username.setText(model.getUsername());
holder.Phone.setText(model.getPhone());
holder.Query.setText(model.getQuery());
// Below line redirects to new layout which shows detailed queries.
/*holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(MainActivity.this,Main2Activity.class);
intent.putExtra("Query",model.getQuery());
}
});*/
}
@NonNull
@Override
public FirebaseViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {
return new FirebaseViewHolder(LayoutInflater.from(MainActivity.this).inflate(R.layout.row, viewGroup, false));
}
};
recyclerView.setAdapter(adapter);
}
}
While Running the app the followin error shows up
E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.creativebeastadmin, PID: 26348 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.creativebeastadmin/com.example.creativebeastadmin.MainActivity}: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.example.creativebeastadmin. Make sure to call FirebaseApp.initializeApp(Context) first. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2895) at android.app.ActivityThread.-wrap11(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1616) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:176) at android.app.ActivityThread.main(ActivityThread.java:6651) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824) Caused by: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.example.creativebeastadmin. Make sure to call FirebaseApp.initializeApp(Context) first. at com.google.firebase.FirebaseApp.getInstance(com.google.firebase:firebase-common@@16.0.2:240) at com.google.firebase.database.FirebaseDatabase.getInstance(com.google.firebase:firebase-database@@16.0.3:67) at com.example.creativebeastadmin.MainActivity.onCreate(MainActivity.java:50) at android.app.Activity.performCreate(Activity.java:7088) at android.app.Activity.performCreate(Activity.java:7079) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1215) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2895) at android.app.ActivityThread.-wrap11(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1616) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:176) at android.app.ActivityThread.main(ActivityThread.java:6651) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824)
