How to use Android Firebase Database callback listener in Android

In this android programming source code example, we are going to use Android Firebase Database callback listener in Android.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to use Android Firebase Database callback listener in Android.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="15dp"
    android:background="#CACACA">

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/titleinput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="90dp">
        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/title"
            android:inputType="textNoSuggestions"
            android:maxLines="1"
            android:singleLine="true" />
    </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/bodyinput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/titleinput">
        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/body"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/body"
            android:inputType="textNoSuggestions"
            android:maxLines="1"
            android:singleLine="true" />
    </com.google.android.material.textfield.TextInputLayout>


    <Button
        android:id="@+id/submit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:layout_below="@id/bodyinput"
        android:textColor="#ffffff"
        android:text="Submit"/>

</RelativeLayout>

MainActivity.java

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

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

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.material.textfield.TextInputEditText;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

public class FirebaseActivity8 extends AppCompatActivity {
    private TextInputEditText title;
    private TextInputEditText body;
    private DatabaseReference mDatabase;
    private Button submit;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_firebase8);
            title = (TextInputEditText)findViewById(R.id.title);
            body = (TextInputEditText)findViewById(R.id.body);
            submit = (Button)findViewById(R.id.submit);
            mDatabase = FirebaseDatabase.getInstance().getReference().child("AndroidView");

            submit.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    String enteredtitle = title.getText().toString();
                    String enteredbody = body.getText().toString();
                    saveData(enteredtitle, enteredbody);
                }
            });


        }
        private void saveData(String strTitle, String strBody){
            DatabaseReference newEntry = mDatabase.push();
            newEntry.child("title").setValue(strTitle);
            newEntry.child("content").setValue(strBody)
                    .addOnSuccessListener(new OnSuccessListener<Void>() {
                        @Override
                        public void onSuccess(Void aVoid) {
                            Toast.makeText(FirebaseActivity8.this,"Data Inserted",Toast.LENGTH_LONG).show();
                        }
                    }).addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    Toast.makeText(FirebaseActivity8.this,e.getMessage(),Toast.LENGTH_LONG).show();
                }
            });
        }
    }

app/build.gradle

implementation 'com.google.firebase:firebase-core:16.0.9'
implementation 'com.google.firebase:firebase-database:17.0.0'

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