How to delete mutiple documents in Android Firebase Database

In this android programming source code example, we are going to delete mutiple documents 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 delete mutiple documents 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>


    <Button
        android:id="@+id/delete"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:layout_below="@id/titleinput"
        android:textColor="#ffffff"
        android:text="Delete"/>

</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 FirebaseActivity19 extends AppCompatActivity {
    private TextInputEditText title;
    private DatabaseReference mDatabase;
    private Button delete;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_firebase19);
        title = (TextInputEditText)findViewById(R.id.title);
        delete = (Button)findViewById(R.id.delete);
        
        mDatabase = FirebaseDatabase.getInstance().getReference().child("AndroidView");
        delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String enteredtitle = title.getText().toString();
                deleteData(enteredtitle);
            }
        });
    }

    private void deleteData(String strTitle){
        Query deleteQuery = mDatabase.orderByChild("title").equalTo(strTitle);
        deleteQuery.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                for(DataSnapshot delData: dataSnapshot.getChildren()){
                    delData.getRef().removeValue();
                }
                Toast.makeText(FirebaseActivity19.this,"Data Deleted",Toast.LENGTH_LONG).show();
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {
                Toast.makeText(FirebaseActivity19.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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