Admob implementation 2020

Test ID  banner: ca-app-pub-1213976995211847/3070735258

build.gradle (app)

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    defaultConfig {
        applicationId "com.xx.xxx"
        minSdkVersion 19
        targetSdkVersion 29
        multiDexEnabled true
        versionCode 4
        versionName "4"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        android.defaultConfig.vectorDrawables.useSupportLibrary = true
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    lintOptions {
        checkReleaseBuilds false
        // Or, if you prefer, you can continue to check for errors in release builds,
        // but continue the build even when errors are found:
        abortOnError false
    }

    buildTypes {
        release {
            minifyEnabled true
            shrinkResources true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'com.google.android.material:material:1.2.1'
    implementation 'androidx.vectordrawable:vectordrawable-animated:1.1.0'
    implementation 'androidx.browser:browser:1.2.0'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.2'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'androidx.cardview:cardview:1.0.0'
    implementation 'com.google.android.gms:play-services-ads:19.4.0'
    implementation 'com.github.midorikocak:currency-picker-android:1.1.9'
    implementation 'com.google.android.gms:play-services-vision:20.1.2'
    testImplementation 'junit:junit:4.12'
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.zakasoft.pricelist">
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <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=".xxxxxxActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait">
            <intent-filter android:label="@string/app_name">
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="com.google.android.gms.ads.AdActivity" />
         <meta-data
         android:name="com.google.android.gms.ads.APPLICATION_ID"
        android:value="ca-app-pub-xxxxx~xxxxxx" />
        
    </application>
</manifest>

        private AdView mAdView;

// for test ads start
        RequestConfiguration configuration =
        new RequestConfiguration.Builder().setTestDeviceIds(Arrays.asList("XXXX72F06F84F223BDEC5BFFE82C3596")).build();
        MobileAds.setRequestConfiguration(configuration);
// for test ads end 

        MobileAds.initialize(this, new OnInitializationCompleteListener() {
            @Override
            public void onInitializationComplete(InitializationStatus initializationStatus) {
            }
        });

        mAdView = findViewById(R.id.adView);
        AdRequest adRequest = new AdRequest.Builder().build();
        mAdView.loadAd(adRequest);

        mAdView.setAdListener(new AdListener() {
            @Override
            public void onAdLoaded() {
                super.onAdLoaded();
                //Toast.makeText(getApplicationContext(), "loaded" ,Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onAdFailedToLoad(LoadAdError loadAdError) {
                super.onAdFailedToLoad(loadAdError);
                //Toast.makeText(getApplicationContext(), "failed" + loadAdError.toString() ,Toast.LENGTH_SHORT).show();
            }
        });

Layout

   <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <com.google.android.gms.ads.AdView
            xmlns:ads="http://schemas.android.com/apk/res-auto"
            android:id="@+id/adView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="8dp"
            android:layout_marginTop="8dp"
            ads:adSize="SMART_BANNER"
            ads:adUnitId="ca-app-pub-121397699521XXXX/307073XXXX">
        </com.google.android.gms.ads.AdView>
    </LinearLayout>