How to add an AdMob banner in your android App

To add an AdMob banner in your Android App, you must use this Java Code in your Activity file.




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

        // Initialize the Mobile Ads SDK.
        MobileAds.initialize(this, "ca-app-pub-3940256099942544~3347511713");

        // Gets the ad view defined in layout/ad_fragment.xml with ad unit ID set in
        // values/strings.xml.
        mAdView = findViewById(R.id.ad_view);

        // Create an ad request. Check your logcat output for the hashed device ID to
        // get test ads on a physical device. e.g.
        // "Use AdRequest.Builder.addTestDevice("ABCDEF012345") to get test ads on this device."
        AdRequest adRequest = new AdRequest.Builder()
                .addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
                .build();

        // Start loading the ad in the background.
        mAdView.loadAd(adRequest);

    }

Then go to your "activity.xml" and create an google ads in your layout.

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

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

    xmlns:ads="http://schemas.android.com/apk/res-auto"

    android:id="@+id/container"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:layout_marginTop="@dimen/activity_vertical_margin"

    tools:context=".MyActivity"

    tools:ignore="MergeRootFrame">

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginLeft="@dimen/activity_horizontal_margin"

        android:layout_marginStart="@dimen/activity_horizontal_margin"

        android:text="@string/hello_world" />

    <com.google.android.gms.ads.AdView

        android:id="@+id/ad_view"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_alignParentBottom="true"

        ads:adSize="BANNER"

        ads:adUnitId="@string/banner_ad_unit_id" />

</RelativeLayout>