How to implement a simple Ad to activity with a simple design

STEP1:

Create google AdMob Account on  https://www.google.com/intl/de_de/adsense/start/

get your publisher id 

it looks like this:

ca-app-pub-12345678912345667778901123 (SAMPLE)NEVER USE your pub id for test purpopeses!
your account may be banned !!!!For test purposes use a test pub id:
https://developers.google.com/admob/android/test-ads

STEP2: 
Create new Empty Activity and add to strings.xml

<string name = "google_app_id" translatable="false">ca-app-pub-3940256099942544/6300978111</string> (test sample)

 STEP3:

ADD to manifest following parameters:

Dont forget the internet permission.Every ad requires it.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="measure.hq.alertdialog">
    <uses-permission android:name="android.permission.INTERNET" />


    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <meta-data
            android:name="com.google.android.gms.ads.APPLICATION_ID"
            android:value="@string/google_app_id"/>


        <meta-data
            android:name="preloaded_fonts"
            android:resource="@array/preloaded_fonts" />
    </application>

</manifest>

STEP 4:

Create a simple design for activity main layout

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/linearLayout4"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/imageView3"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="237dp"
        android:background="@color/colorYellow"
        app:layout_constraintBottom_toTopOf="@+id/button2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageButton
        android:id="@+id/button"
        android:layout_width="0dp"
        android:layout_height="467px"
        android:background="@drawable/btncomeprof"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/imageView3" />

    <ImageButton
        android:id="@+id/button2"
        android:layout_width="0dp"
        android:layout_height="467px"
        android:background="@drawable/btnleaveprof"
        app:layout_constraintBottom_toTopOf="@+id/imageView5"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/imageView3" />

    <ImageView
        android:id="@+id/imageView5"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="2dp"
        android:background="@color/colorYellow"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button2" />

    <ImageButton
        android:id="@+id/buttonD"
        android:layout_width="54dp"
        android:layout_height="51dp"
        android:layout_marginStart="284dp"
        android:layout_marginTop="24dp"
        android:layout_marginBottom="8dp"
        android:backgroundTint="@color/browser_actions_divider_color"
        android:scaleType="fitXY"
        android:translationY="-30px"
        app:layout_constraintBottom_toBottomOf="@+id/imageView3"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/ic_action_name" />

    <ImageButton
        android:id="@+id/button3"
        android:layout_width="35dp"
        android:layout_height="36dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="24dp"
        android:layout_marginBottom="8dp"
        android:background="@drawable/list"
        android:backgroundTint="@color/browser_actions_divider_color"
        android:scaleType="fitXY"
        android:src="@drawable/listname"
        android:translationY="-30px"
        app:layout_constraintBottom_toBottomOf="@+id/imageView3"
        app:layout_constraintStart_toStartOf="@+id/imageView3"
        app:layout_constraintTop_toTopOf="parent" />

    <com.google.android.gms.ads.AdView
        android:id="@+id/adView"
        android:layout_width="371dp"
        android:layout_height="103dp"
        android:layout_centerHorizontal="true"
        android:translationY="20px"
        app:adSize="SMART_BANNER"

        app:adUnitId="@string/Banner_Ad"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.38"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/imageView5"
        app:layout_constraintVertical_bias="0.89">

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

    <TextView
        android:id="@+id/txstats"
        android:layout_width="225dp"
        android:layout_height="31dp"
        android:layout_marginStart="135dp"
        android:layout_marginTop="28dp"
        android:layout_marginEnd="157dp"
        android:fontFamily="@font/abril_fatface"
        android:gravity="center"
        android:text="@string/online"
        android:textColor="#00FFFFFF"
        android:textSize="18sp"
        android:translationY="-30px"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

STEP 5: Define buttons initialize Views

public class MainActivity extends AppCompatActivity {

    Context context = this;
    private TextView username;
    private TextView password;
    private TextView welcome;

    int duration = Toast.LENGTH_SHORT;
    CharSequence text = "Hello Bob";
    Toast toast ;
    ImageButton btnrd;
    ImageButton btLogfile;
    ImageButton btnx;

    ImageButton btn_come;
    TextView txstats;
    private AdView mAdView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btn_come = findViewById(R.id.button);
        btnrd = findViewById(R.id.button2);
        btLogfile = findViewById(R.id.button3);
        txstats = findViewById(R.id.txstats);

        mAdView = findViewById(R.id.adView);

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

        mAdView.setAdListener(new AdListener() {
            @Override
            public void onAdLoaded() {
                // Code to be executed when an ad finishes loading.
            }

            @Override
            public void onAdFailedToLoad(int errorCode) {
                // Code to be executed when an ad request fails.
            }

            @Override
            public void onAdOpened() {
                // Code to be executed when an ad opens an overlay that
                // covers the screen.
            }

            @Override
            public void onAdLeftApplication() {
                // Code to be executed when the user has left the app.
            }

            @Override
            public void onAdClosed() {
                // Code to be executed when when the user is about to return
                // to the app after tapping on an ad.
            }
        });


            }





    }

ADD some fonts with (create in  fonts folder-> abril_fatface.xml)

<?xml version="1.0" encoding="utf-8"?>
<font-family xmlns:app="http://schemas.android.com/apk/res-auto"
app:fontProviderAuthority="com.google.android.gms.fonts"
app:fontProviderPackage="com.google.android.gms"
app:fontProviderQuery="Abril Fatface"
app:fontProviderCerts="@array/com_google_android_gms_fonts_certs">
</font-family>

ADD font_certs.xml file to values folder

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <array name="com_google_android_gms_fonts_certs">
        <item>@array/com_google_android_gms_fonts_certs_dev</item>
        <item>@array/com_google_android_gms_fonts_certs_prod</item>
    </array>
    <string-array name="com_google_android_gms_fonts_certs_dev">
        <item>
            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
        </item>
    </string-array>
    <string-array name="com_google_android_gms_fonts_certs_prod">
        <item>
            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
        </item>
    </string-array>
</resources>

RESULT:

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