Firebase - 1

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAlignment="center"
        android:textSize="24dp"
        android:text="Firebase A"
         />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Todo"
        android:id="@+id/todotext"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="addData"
        android:text="Add"
        />
</LinearLayout>

MainActivity.java

package com.vokasi.firebase_a;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

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 {
    EditText todotitle;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        todotitle = (EditText) findViewById(R.id.todotext);
        final FirebaseDatabase database = FirebaseDatabase.getInstance();
        DatabaseReference todoRef = database.getReference("connection");
        todoRef.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                String value = dataSnapshot.getValue(String.class);
                Toast.makeText(MainActivity.this, value, Toast.LENGTH_LONG).show();
            }

            @Override
            public void onCancelled(DatabaseError error) {
                Toast.makeText(MainActivity.this, error.toException().toString(), Toast.LENGTH_LONG).show();
            }
        });
    }

    public void addData(View view){
        final FirebaseDatabase database = FirebaseDatabase.getInstance();
        DatabaseReference todoRef = database.getReference("todos");
        String title = todotitle.getText().toString();

        todoRef.push().setValue(new Todo(title,false));
        todotitle.setText("");
        Toast.makeText(this, "Data sudah tersimpan", Toast.LENGTH_SHORT).show();
    }
}

Todo.java

package com.vokasi.firebase_a;

public class Todo {
    String title;
    boolean completed;

    public Todo(String title, boolean completed) {
        this.title = title;
        this.completed = completed;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public boolean isCompleted() {
        return completed;
    }

    public void setCompleted(boolean completed) {
        this.completed = completed;
    }
}