Read All Data Use ListView Realtime Firedatabase -1

Read All Data Use ListView Realtime Firedatabase -1

1:- Method List View

<?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"
    tools:context=".MainActivity">

 <ListView
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:id="@+id/list_item"
     android:divider="@color/colorPrimary"/>

</LinearLayout>
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dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.google.firebase:firebase-analytics:17.4.4'
    implementation 'com.google.firebase:firebase-database:19.3.1'
    testImplementation 'junit:junit:4.12'
    implementation 'com.firebase:firebase-client-android:2.3.1'//use Dependencies
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

}
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MainActivity.java

package com.patel.readalldatalistview;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import com.firebase.client.ChildEventListener;
import com.firebase.client.DataSnapshot;
import com.firebase.client.Firebase;
import com.firebase.client.FirebaseError;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
ListView listView;
Firebase uri;
ArrayList<String> arrayList=new ArrayList<>();
ArrayAdapter<String> arrayAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView=findViewById(R.id.list_item);
        Firebase.setAndroidContext(this);
        uri=new Firebase("https://registration-3af80.firebaseio.com/");
        arrayAdapter=new ArrayAdapter<String >(this,android.R.layout.simple_list_item_1,arrayList);
listView.setAdapter(arrayAdapter);
uri.addChildEventListener(new ChildEventListener() {
    @Override
    public void onChildAdded(DataSnapshot dataSnapshot, String s) {
       String value=dataSnapshot.getValue(String.class);
       arrayList.add(value);
       arrayAdapter.notifyDataSetChanged();
    }

    @Override
    public void onChildChanged(DataSnapshot dataSnapshot, String s) {

    }

    @Override
    public void onChildRemoved(DataSnapshot dataSnapshot) {

    }

    @Override
    public void onChildMoved(DataSnapshot dataSnapshot, String s) {

    }

    @Override
    public void onCancelled(FirebaseError firebaseError) {

    }
});

    }
}