how to add banner ads in android studio

hello, android developer welcome to your site. In this article, I will tell you how to show banner ads in your android app.

XML (activity_main.xml)

<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    >

    <TextView android:text="Welcome to Tutlane"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
        <com.google.android.gms.ads.AdView
        xmlns:ads="http://schemas.android.com/apk/res-auto"
        android:id="@+id/adView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_alignParentBottom="true"
        ads:adSize="BANNER"
        ads:adUnitId="ca-app-pub-3940256099942544/6300978111">
    </com.google.android.gms.ads.AdView>
</RelativeLayout>

JAVA (MainActivity.java)

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import com.google.android.gms.ads.MobileAds;

public class AdMobBannerAds extends AppCompatActivity {
    private AdView adView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ad_mob_banner_ads);

        MobileAds.initialize(this, "ca-app-pub-3940256099942544~3347511713");
        adView = (AdView)findViewById(R.id.adView);
        AdRequest request = new AdRequest.Builder().build();
        adView.loadAd(request);
    }
}