Android Adding Banner Ads into Apps Admob

1) Add Internet Permission

    <uses-permission android:name="android.permission.INTERNET"/>

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

2) Add Dependency In Your Gradle File

   implementation 'com.google.android.gms:play-services-ads:15.0.1' 

3) Create Your App Id On Admob Site

   

  Create your app id on admob site

  

   * Don't Use Your Unit Id For Tesing, Other Wise Your Admob Account Will Suspend By Admob Policy

      Use Dummy Id Which Provided By Admob For Testing

      From: 

      https://developers.google.com/admob/android/test-ads *

4) Layout File File

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

<RelativeLayout 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">

    <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_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="32dp"

        ads:adSize="BANNER"

        ads:adUnitId="ca-app-pub-3940256099942544/6300978111"/>

</RelativeLayout>

5) Java File

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

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 android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.app.Activity;

import android.content.Context;

import android.content.DialogInterface;

import android.support.v4.app.Fragment;

import android.support.v7.app.AlertDialog;

import android.view.Window;

import android.view.WindowManager;

import android.widget.RelativeLayout;

public class MainActivity extends AppCompatActivity {

    private AdView mAdView;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        // Request window feature action bar

        requestWindowFeature(Window.FEATURE_ACTION_BAR);

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        // Add Your App ID From Admob

        MobileAds.initialize(this,

                "ca-app-pub-1824429213524177~7047017369");

        mAdView = findViewById(R.id.adView);

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

        mAdView.loadAd(adRequest);

    }

}