We require the SDK to be initialized only once and as early as possible so for this purpose using Android’s application class is recommended but if your app only has one activity, if using the activity make sure it is never destroyed unless killing the app or placing it in the background, matching then the lifecycle of Application, you can initialize it in onCreate method of that Activity.

class Application: Application()
{
    override fun onCreate()
    {
        super.onCreate()
        
		R89SDK.setDebug() //This is for testing purposes, remove it on prod
		R89SDK.setLogLevel(LogLevels.DEBUG) //This is for testing purposes, remove it on prod
		
		addTestingSingleTagData() /* This is a later step */
		
		R89SDK.initialize(
			appContext = this,
			publisherId = "TestRefinery89ID", /* This is for testing purposes, change it on prod */
			appId = "TestDemoApp", /* This is for testing purposes, change it on prod */
			singleLine = true,
			initializationEvents = null
		)
    }
}

Your publisherId and appId will be provided to you during onboarding process by email, you can also retrieve them from the web interface after login.

This appID is not the same as the Manifest App Id you used in previous steps

Remember that the ".Application" depends on the name of the class. If we named the class MyApplication we would need to put “.MyApplication"

<manifest>
    <application
        android:name=".Application">
    </application>
</manifest>

This is a simplified example, you should have many more lines in the manifest, copy the important bits only.

<manifest>

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="com.google.android.gms.permission.AD_ID"/>
    
    <application
        android:name=".Application">
    
    <!-- This is the Sample App ID-->
    <meta-data
        android:name="com.google.android.gms.ads.APPLICATION_ID"
        android:value="ca-app-pub-3940256099942544~3347511713"/>
        
    </application>
</manifest>

# activity_main.xml
...
<LinearLayout
    android:id="@+id/ad_container"
    android:tag="main_activity_bottom_ad_container"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:layout_centerHorizontal="true"
    android:layout_alignParentBottom="true">
</LinearLayout>
...

With this added to your views we can detect that tag and place an ad inside of it if the single tag data says so.

class MainActivity : AppCompatActivity()
{
	override fun onCreate(savedInstanceState: Bundle?)
	{
		super.onCreate(savedInstanceState)
		setContentView(R.layout.activity_main_auto)
		
		findViewById<Button>(R.id.goToNewsPost).setOnClickListener {
			val intent = Intent(this, NewsPostDetailActivity::class.java).apply {
				putExtra("newsPostData", newPostData)
			}
			startActivity(intent)
		}
	}
}

In this example an interstitial would be triggered when we see the NewsPostDetailActivity comes to live after loading.

# activity_main.xml
...
<Button
    android:id="@+id/play_video_trailer"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:tag="play_video_trailer_tag" />
...

class MainActivity : AppCompatActivity()
{
	override fun onCreate(savedInstanceState: Bundle?)
	{
		super.onCreate(savedInstanceState)
		setContentView(R.layout.activity_main_auto)
		
		findViewById<Button>(R.id.playVideoTrailer).setOnClickListener {
			playVideoTrailer()
		}
	}
}

In this example an interstitial would be triggered when the button is pressed and when the interstitial is closed the playVideoTrailer() method will be executed.

When using the SingleTagConfigBuilder you are not going to be able to select the ad units that are for production, they are by default the testing config id in Android - Ad Formats.

fun addTestingSingleTagData()
{
    //Add a Screen that is an Activity, the screenName you can get it by logging this in you code -> 
    // MainActivity::class.simpleName -> MainActivity
    // NewsPostDetailActivity::class.simpleName -> NewsPostDetailActivity
    
    val screenBuilder = SingleTagConfigBuilder.addAdScreenBuilder(
        isFragment = false, 
        screenName = "MainActivity"
    )
    
    // Add a banner format to the wrapper with the tag main_activity_bottom_ad_container
    screenBuilder.addBanner(
      wrapperTag = "main_activity_bottom_ad_container", 
      getAllWithTag = false, /* Only the first tagged wrapper in "MainActivity" with this tag will be used for this banner*/
      wrapperRelativePositionInside = true /* the ad will be placed inside of the wrapper */
    )
    
    /* trigger interstitial when we transition from "MainActivity" (ScreenBuilder.screenName) TO NewsPostDetailActivity */
    screenBuilder.addInterstitial(
        eventsToTrackTo = "NewsPostDetailActivity", 
        eventsToTrackButton = null
    )
    
    /* trigger an interstitial when a button with this tag is pressed in "MainActivity" (ScreenBuilder.screenName) */
    screenBuilder.addInterstitial(
        eventsToTrackTo = null
        eventsToTrackButton = "play_video_trailer_tag" 
    )
}

This step is for testing purposes and you are only going to see test ads when using this approach, but this is very helpful to us if you provide this peace of code to tell us where you want to place the ads.

Later when in production, this code will be removed and you have hopefully added flexible tagged wrappers and tagged all the button as possible so we can change your ad slots from the server without the need of updating the app.