Please help me get the "UserNickName"

[mins7901]

Hi.
Please help me get the "UserNickName"



import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

import com.google.firebase.auth.FirebaseAuth;
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 RealtimeDatabase extends AppCompatActivity {

TextView textView1 , textView2;
FirebaseAuth auth;

FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference databaseRef = database.getReference("Memo");
DatabaseReference databaseNick = database.getReference("Users");



@override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_realtime_database);

textView1 = findViewById(R.id.textView1);
textView2 = findViewById(R.id.textView2);
}

@override
protected void onStart() {
super.onStart();

databaseRef.addValueEventListener(new ValueEventListener() {
@override
public void onDataChange(DataSnapshot dataSnapshot) {
String text = dataSnapshot.getValue(String.class);
textView1.setText(text);
}

@override
public void onCancelled(DatabaseError databaseError) {

}
});

databaseNick.child(auth.getCurrentUser().getDisplayName()).child("UserNickName").addValueEventListener(new ValueEventListener() {
@override
public void onDataChange(DataSnapshot dataSnapshot) {
String text = dataSnapshot.getValue(String.class);
textView2.setText(text);
}

@override
public void onCancelled(DatabaseError databaseError) {

}
});
}
}

 

[Deleted User]

Please explain what the problem is.

 

[mins7901]

Please explain what the problem is.

I want to display "UserNickName" in "textView2"
But the app ends.

Users
Kyungmin Lim
Uid:
UserEmail:
UserNickName: "ABCD"

 

[Deleted User]

Please post the stack trace from the Logcat view.

See here for more information:

https://androidforums.com/threads/please-read-me-before-posting.987318/