Android Studio中Google AdMob插页广告：点击按钮1-20随机概率触发

Hey there! I’ve built this exact feature for a few projects, so let me walk you through it step by step. The goal is to show an interstitial ad only 1 out of 20 times when a button is clicked—no annoying every-click popups here.

Step 1: Set Up AdMob Dependencies & Manifest #

First, get the AdMob SDK added to your module-level build.gradle:

dependencies {
    implementation 'com.google.android.gms:play-services-ads:22.6.0' // Use the latest version available
}

Next, add your AdMob App ID to AndroidManifest.xml inside the <application> tag:

<meta-data
    android:name="com.google.android.gms.ads.APPLICATION_ID"
    android:value="ca-app-pub-XXXXXXXXXXXXXXXX~YYYYYYYYYY"/> <!-- Replace with your actual App ID -->

Don’t forget the internet permission (add this outside the <application> tag):

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

Step 2: Initialize & Preload the Interstitial Ad #

In your Activity/Fragment, declare the interstitial ad instance and a random number generator. We’ll preload the ad so it’s ready when needed:

import com.google.android.gms.ads.AdRequest
import com.google.android.gms.ads.interstitial.InterstitialAd
import com.google.android.gms.ads.interstitial.InterstitialAdLoadCallback
import com.google.android.gms.ads.FullScreenContentCallback
import com.google.android.gms.ads.AdError
import kotlin.random.Random

class MainActivity : AppCompatActivity() {
    private var mInterstitialAd: InterstitialAd? = null
    private val random = Random(System.currentTimeMillis()) // Seed with time for better randomness

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Load ad when the activity starts
        loadInterstitialAd()

        // Hook up your button click listener
        findViewById<Button>(R.id.your_button_id).setOnClickListener {
            checkAndTriggerAd()
        }
    }

    private fun loadInterstitialAd() {
        val adRequest = AdRequest.Builder().build()
        InterstitialAd.load(
            this,
            "ca-app-pub-3940256099942544/1033173712", // Use this test ID for development
            adRequest,
            object : InterstitialAdLoadCallback() {
                override fun onAdLoaded(interstitialAd: InterstitialAd) {
                    mInterstitialAd = interstitialAd
                    // Set up callbacks for ad lifecycle
                    mInterstitialAd?.fullScreenContentCallback = object : FullScreenContentCallback() {
                        override fun onAdDismissedFullScreenContent() {
                            // Reload ad after it's closed so it's ready next time
                            mInterstitialAd = null
                            loadInterstitialAd()
                        }

                        override fun onAdFailedToShowFullScreenContent(error: AdError) {
                            mInterstitialAd = null
                            loadInterstitialAd()
                        }
                    }
                }

                override fun onAdFailedToLoad(error: LoadAdError) {
                    mInterstitialAd = null
                    // Optional: Add a retry delay here if you want to try loading again
                }
            }
        )
    }

Step 3: Implement the Random Trigger Logic #

Add the function that checks the 1/20 probability and either shows the ad or runs your normal button action:

private fun checkAndTriggerAd() {
        // Generate a random number between 1 and 20 (inclusive)
        val randomChance = random.nextInt(20) + 1

        // Only show ad if we hit the 1/20 chance
        if (randomChance == 1 && mInterstitialAd != null) {
            mInterstitialAd?.show(this)
        } else {
            // Run your regular button functionality here
            performButtonAction()
        }
    }

    private fun performButtonAction() {
        // Replace this with your actual button logic
        Toast.makeText(this, "Button clicked—no ad this time!", Toast.LENGTH_SHORT).show()
    }
}

Key Best Practices #

• Use Test IDs First: Always use Google’s test ad IDs during development to avoid policy strikes. The test interstitial ID used above is safe for testing.
• Preload Ads: Loading ads upfront ensures they’re ready when the random trigger hits—no waiting for ad loads mid-user interaction.
• Reload After Dismissal: Reloading the ad after it closes keeps a fresh ad ready for the next possible trigger.
• Avoid Overloading Users: The 1/20 strike rate is a good balance between monetization and user experience—stick to it to keep users happy.

内容的提问来源于stack exchange，提问作者codelovers