How to update data in Android Firebase Database

In this android programming source code example, we are going to update data in Android Firebase Database.

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 update data in Android Firebase Database.

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/edit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:layout_below="@id/bodyinput"
        android:textColor="#ffffff"
        android:text="Edit"/>

</RelativeLayout>

MainActivity.java

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.material.textfield.TextInputEditText;
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.Query;
import com.google.firebase.database.ValueEventListener;

public class FirebaseActivity4 extends AppCompatActivity {
    private TextInputEditText title;
    private TextInputEditText body;
    private DatabaseReference mDatabase;
    private Button edit;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_firebase4);
        title = (TextInputEditText)findViewById(R.id.title);
        body = (TextInputEditText)findViewById(R.id.body);
        edit = (Button)findViewById(R.id.edit);
        mDatabase = FirebaseDatabase.getInstance().getReference().child("AndroidView");

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


    }
    private void editData(String strTitle, final String strBody){
        Query editQuery = mDatabase.orderByChild("title").equalTo(strTitle);
        editQuery.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                for(DataSnapshot edtData: dataSnapshot.getChildren()){
                    edtData.getRef().child("content").setValue(strBody);
                }
                Toast.makeText(FirebaseActivity4.this,"Data Edited",Toast.LENGTH_LONG).show();
            }
            @Override
            public void onCancelled(DatabaseError databaseError) {
                Toast.makeText(FirebaseActivity4.this,databaseError.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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