Unable to fetch data from my database all permissions are public and dependencies included. I am trying to print data to logcat, receiving NullPointerException
MainActivity.java
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef = database.getReference();
myRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
String co2=dataSnapshot.child("co2").getValue().toString();
String humi=dataSnapshot.child("humi").getValue().toString();
String temp=dataSnapshot.child("temp").getValue().toString();
Log.i("kkk","hhh"+ co2 +" "+humi +" "+temp);
// ...
}
@Override
public void onCancelled(DatabaseError databaseError) {
// Getting Post failed, log a message
Log.w("p", "loadPost:onCancelled", databaseError.toException());
// ...
}
});
}
}