Null pointer while looping though firebase

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I may be missing something, can some one help me point it out, i am trying to loop this this node in firebase then get the child 'idno' but when i toast the full snapshot ie (snapshot.getValue().toString()), it returns the complete data set, however trying to get the child from the snapshot as such gives a null pointer snapshot.child("idno").getValue().toString(), please help me figure out what am missing

DatabaseReference thefarmers = FirebaseDatabase.getInstance().getReference().child("Thepath").child("Farmers");
thefarmers.addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
            //Get the child id
            theMethods.makeLongToast(snapshot.child("idno").getValue().toString());

        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
        Toast.makeText(getActivity(), databaseError.getMessage().toString(), Toast.LENGTH_SHORT).show();
    }
});

This theMethods.makeLongToast(); is a simple method that takes a string and makes a Toast

Change This line

theMethods.makeLongToast(snapshot.child("idno").getValue().toString());

to

if (snapshot.hasChild("idno") && snapshot.child("idno") != null)
    theMethods.makeLongToast(snapshot.child("idno").getValue(String.class));

Create a Storage Reference on Web, Test with the Firebase console · Test with the gcloud CLI · Run a Game Loop test By creating a reference to a file, your app gains access to it. A reference can be thought of as a pointer to a file in the cloud. getParent() navigates up one level, while getRoot() navigates all the way to the top. getParent() returns null . Questions: I am working on a chat app using firebase. It was working fine but then I tried something to manage the users account which consist of the display name, its status and a circular image. I coded but when I tried to change its status changing it from the firebase database it crashed. StackTrace:

replace thefarmers.addListenerForSingleValueEvent(new ValueEventListener()

with thefarmers.addValueEventListener(new ValueEventListener()

Create a Storage Reference on Android, I'm having a big problem with my app when trying to use realtime database, follows stacktrace: 2019-12-22 GitHub is home to over 50 million developers working together to host and review code, manage applyOperationToView(​com.google.firebase:firebase-database@@19.2.0:76) Looper.loop(Looper.​java:164) We also got a NPE from FirebaseRemoteConfig.getInstance since the upgrade to 15.0.0, but the stack trace looks different from the one posted above. Caused by java.lang.NullPointerException Attempt to write to field 'long com.google.android.gms.internal.config.r.b' on a null object reference com.google.firebase.remoteconfig.FirebaseRemoteConfig.

From @ Frank van Puffelen's comment, turns out the first sub - child's idno property is 'idno"' instead of 'idno', this fixed it for me.

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Comments
  • Please only use the android-studio tag for questions about the Android Studio IDE itself. For questions about Android programming in general, use the android tag.
  • It looks like one of the child nodes doesn't have an idno property. You might want to print Log.i("TAG", dataSnapshot.getKey()) first inside the loop, to see which child is causing the problem.
  • My bad @ Frank van Puffelen, got it.
  • Thanks @ Frank van Puffelen, turns out the first sub - child's idno property is 'idno"' instead of 'idno'
  • both of them return the same Reference,the only difference is first line get value for one and the second listent everytime it change!