Coba

package com.example.rasyidk.coba;

import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

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 coba extends AppCompatActivity {

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


        Button btnOutput = findViewById(R.id.btn_output);

        final TextView textOutput = findViewById(R.id.output);
        final  EditText textMlebu= findViewById(R.id.jarak);

        FirebaseDatabase database = FirebaseDatabase.getInstance();
        final DatabaseReference reference = database.getReference();




        btnOutput.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                reference.addValueEventListener(new ValueEventListener() {
                    @Override
                    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                        String output = dataSnapshot.child("input data").getValue(String.class);
                        textOutput.setText(output);

                        String jarak = dataSnapshot.child("jarak").getValue(String.class);
                        textMlebu.setText(jarak);
                    }

                    @Override
                    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

                    }


                    @Override
                    public void onCancelled(@NonNull DatabaseError databaseError) {

                    }
                });

            }
        });
    }
}