How To Implement Ads With Firebase In Android Studio

 Java code

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.RelativeLayout;

import androidx.appcompat.app.AppCompatActivity;

import com.firebase.client.DataSnapshot;

import com.firebase.client.Firebase;

import com.firebase.client.FirebaseError;

import com.firebase.client.ValueEventListener;

import com.google.android.gms.ads.AdRequest;

import com.google.android.gms.ads.AdSize;

import com.google.android.gms.ads.AdView;

import com.google.android.gms.ads.InterstitialAd;

import com.google.android.gms.ads.MobileAds;

import com.google.android.gms.ads.initialization.InitializationStatus;

import com.google.android.gms.ads.initialization.OnInitializationCompleteListener;

public class MainActivity extends AppCompatActivity {

    RelativeLayout banner;

    String data;

    String intVar;

    InterstitialAd interstitialAd;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        MobileAds.initialize(this, new OnInitializationCompleteListener() {

            @Override

            public void onInitializationComplete(InitializationStatus initializationStatus) {

            }

        });

        fireInt("https://testads-.firebaseio.com/inter");

        interstitialAd = new InterstitialAd(this);

        Button button = findViewById(R.id.showAds);

        button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                if (interstitialAd.isLoaded()){

                    interstitialAd.show();

                }

            }

        });

        banner = findViewById(R.id.banner_container);

        fireAds("https://testads-.firebaseio.com/banner");

    }

    public void fireAds(String adsUrl) {

        Firebase.setAndroidContext(this);

        Firebase firebase = new Firebase(adsUrl);

        firebase.addValueEventListener(new ValueEventListener() {

            @Override

            public void onDataChange(DataSnapshot dataSnapshot) {

                data = dataSnapshot.getValue(String.class);

                AdView mAdView = new AdView(MainActivity.this);

                mAdView.setAdUnitId(data);

                banner.addView(mAdView);

                mAdView.setAdSize(AdSize.SMART_BANNER);

                AdRequest adRequest = new AdRequest.Builder().build();

                mAdView.loadAd(adRequest);

            }

            @Override

            public void onCancelled(FirebaseError firebaseError) {

            }

        });

    }

    public void fireInt(String intUrl) {

        Firebase.setAndroidContext(this);

        Firebase firebase = new Firebase(intUrl);

        firebase.addValueEventListener(new ValueEventListener() {

            @Override

            public void onDataChange(DataSnapshot dataSnapshot) {

                intVar = dataSnapshot.getValue(String.class);

                interstitialAd.setAdUnitId(intVar);

                interstitialAd.loadAd(new AdRequest.Builder().build());

            }

            @Override

            public void onCancelled(FirebaseError firebaseError) {

            }

        }); 

}}

XML Code

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity">

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/showAds"

        android:text="Show"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        />

    <RelativeLayout

        android:id="@+id/banner_container"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true" />

</RelativeLayout>

Build.gradle (App)

implementation 'com.google.firebase:firebase-core:18.0.0'

implementation 'com.google.firebase:firebase-database:19.6.0'

implementation 'com.google.firebase:firebase-ads:19.6.0'

implementation 'com.firebase:firebase-client-android:2.5.1'