CODEWITHSUNDEEP
androidfirebaselistviewfirebase-realtime-database
Janith Warnamana
Janith Warnamana

Reputation: 11

retrieving data from firebase database to listview null in getvalue

I'm very new to android studio and i'm coming across a mistake in my code where im trying to display a listview of a few items in my firebase database. However, its displaying null in my getvalue functions. Please help.

Main Activity

public class MainActivity extends AppCompatActivity {

DatabaseReference database;

List<Users> usersList;

ListView lister;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    lister = (ListView) findViewById(R.id.loglist);

    database = FirebaseDatabase.getInstance().getReference("Activity Log");

    usersList = new ArrayList<>();

}

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

    database.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

            usersList.clear();

            for (DataSnapshot usersnapshot : dataSnapshot.getChildren()) {
                Users users = dataSnapshot.getValue(Users.class);

                usersList.add(users);
            }

            LogDetails adapter = new 
 LogDetails(MainActivity.this,usersList);
            lister.setAdapter(adapter);

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
   }
 }

LogDetails class

public class LogDetails extends ArrayAdapter<Users> {

    private Activity context;

    private List<Users> usersList;

    public LogDetails (Activity context,List<Users> usersList){
        super(context,R.layout.listview,usersList );
        this.context=context;
        this.usersList=usersList;
    }

@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
    LayoutInflater inflater = context.getLayoutInflater();

    View viewer = inflater.inflate(R.layout.listview,null,true);

    TextView text = (TextView) viewer.findViewById(R.id.text);

    Users users = usersList.get(position);

    text.setText(users.getUsername()+" unlocked the door at "+users.getUnlocktime());



    return viewer;
  }
}

Users class

public class Users {

String locktime;
String unlocktime;
String username;

public Users(){

}

public Users(String locktime,String unlocktime,String username){
    this.locktime=locktime;
    this.unlocktime=unlocktime;
    this.username=username;

}

public String getLocktime() {
    return locktime;
}

public String getUnlocktime() {
    return unlocktime;
}

public String getUsername() {
    return username;
  }
}

My data base has a root called ActivityLog with three children nodes and 3 nodes for each of the children nodes. Any help is aprreciated

database layout

Upvotes: 0

Views: 257

Answers (1)

Levi Moreira
Levi Moreira

Reputation: 12005

Firebase need public setters in order to fill your object's properties. Add setters to your POJO:

public class User {
    private String locktime;
    private String unlocktime;
    private String username;

    public String getLocktime() {
        return locktime;
    }

    public void setLocktime(String locktime) {
        this.locktime = locktime;
    }

    public String getUnlocktime() {
        return unlocktime;
    }

    public void setUnlocktime(String unlocktime) {
        this.unlocktime = unlocktime;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }
}

Upvotes: 1

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