안드로이드앱에서 광고 및 결제를 관리하기 위한 예제 코드

[개요]

• 안드로이드 프로그래밍 관련 게시물
• 예제의 기능은 두 개의 수를 입력하여 그 곱을 출력
• 앱 화면 하단에 광고를 표시하도록 함.
• 유료 결제 사용자인 경우, 광고가 제거되도록 설정됨.

 

package com.example.multiplyapp

import android.os.Bundle
import android.widget.Button
import android.widget.EditText
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import com.android.billingclient.api.*
import com.google.android.gms.ads.AdRequest
import com.google.android.gms.ads.AdView
import com.google.android.gms.ads.MobileAds

class MainActivity : AppCompatActivity(), PurchasesUpdatedListener {

    private lateinit var adView: AdView
    private lateinit var billingClient: BillingClient
    private val removeAdsProductId = "remove_ads" // Replace with your product ID from Play Console

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

        // Initialize AdMob
        MobileAds.initialize(this)

        adView = findViewById(R.id.adView)

        // Initialize Play Billing Client
        billingClient = BillingClient.newBuilder(this)
            .enablePendingPurchases()
            .setListener(this)
            .build()

        billingClient.startConnection(object : BillingClientStateListener {
            override fun onBillingSetupFinished(billingResult: BillingResult) {
                if (billingResult.responseCode == BillingClient.BillingResponseCode.OK) {
                    checkPurchaseStatus()
                }
            }

            override fun onBillingServiceDisconnected() {
                // Handle billing service disconnection
            }
        })

        // UI Elements
        val num1EditText: EditText = findViewById(R.id.editTextNumber1)
        val num2EditText: EditText = findViewById(R.id.editTextNumber2)
        val resultTextView: TextView = findViewById(R.id.resultTextView)
        val multiplyButton: Button = findViewById(R.id.multiplyButton)
        val removeAdsButton: Button = findViewById(R.id.removeAdsButton)

        // Multiply Button Click Listener
        multiplyButton.setOnClickListener {
            val num1 = num1EditText.text.toString().toDoubleOrNull()
            val num2 = num2EditText.text.toString().toDoubleOrNull()

            if (num1 != null && num2 != null) {
                val result = num1 * num2
                resultTextView.text = "Result: $result"
            } else {
                resultTextView.text = "Please enter valid numbers"
            }
        }

        // Remove Ads Button Click Listener
        removeAdsButton.setOnClickListener {
            startPurchaseFlow()
        }
    }

    private fun startPurchaseFlow() {
        val skuList = listOf(removeAdsProductId)
        val params = SkuDetailsParams.newBuilder()
            .setSkusList(skuList)
            .setType(BillingClient.SkuType.INAPP)
            .build()

        billingClient.querySkuDetailsAsync(params) { billingResult, skuDetailsList ->
            if (billingResult.responseCode == BillingClient.BillingResponseCode.OK && !skuDetailsList.isNullOrEmpty()) {
                val skuDetails = skuDetailsList[0]
                val flowParams = BillingFlowParams.newBuilder()
                    .setSkuDetails(skuDetails)
                    .build()
                billingClient.launchBillingFlow(this, flowParams)
            }
        }
    }

    private fun checkPurchaseStatus() {
        val purchaseResult = billingClient.queryPurchases(BillingClient.SkuType.INAPP)
        val purchasesList = purchaseResult.purchasesList

        if (purchasesList != null) {
            for (purchase in purchasesList) {
                if (purchase.skus.contains(removeAdsProductId)) {
                    handlePurchase(purchase)
                    return
                }
            }
        }
        // Show ads if purchase not found
        loadAds()
    }

    private fun loadAds() {
        val adRequest = AdRequest.Builder().build()
        adView.loadAd(adRequest)
    }

    override fun onPurchasesUpdated(billingResult: BillingResult, purchases: MutableList<Purchase>?) {
        if (billingResult.responseCode == BillingClient.BillingResponseCode.OK && purchases != null) {
            for (purchase in purchases) {
                if (purchase.skus.contains(removeAdsProductId)) {
                    handlePurchase(purchase)
                }
            }
        }
    }

    private fun handlePurchase(purchase: Purchase) {
        // Grant purchase benefits
        savePurchaseStatus(true)
        adView.visibility = AdView.GONE
    }

    private fun savePurchaseStatus(isPurchased: Boolean) {
        val sharedPreferences = getSharedPreferences("app_prefs", MODE_PRIVATE)
        sharedPreferences.edit().putBoolean("ads_removed", isPurchased).apply()
    }

    private fun isPurchaseSaved(): Boolean {
        val sharedPreferences = getSharedPreferences("app_prefs", MODE_PRIVATE)
        return sharedPreferences.getBoolean("ads_removed", false)
    }
}

 

[build.gradle]

implementation 'com.google.android.gms:play-services-ads:22.2.0'
implementation 'com.android.billingclient:billing:6.0.1'

 

[AndroidManifest.xml]

<uses-permission android:name="android.permission.INTERNET" />
<application>
    <meta-data
        android:name="com.google.android.gms.ads.APPLICATION_ID"
        android:value="YOUR_ADMOB_APP_ID" /> <!-- Replace with your AdMob App ID -->
</application>

 

[activity_main.xml]

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

    <EditText
        android:id="@+id/editTextNumber1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter first number"
        android:inputType="numberDecimal" />

    <EditText
        android:id="@+id/editTextNumber2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter second number"
        android:inputType="numberDecimal" />

    <Button
        android:id="@+id/multiplyButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Multiply" />

    <TextView
        android:id="@+id/resultTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Result will appear here"
        android:textSize="18sp"
        android:layout_marginTop="16dp"/>

    <com.google.android.gms.ads.AdView
        android:id="@+id/adView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        ads:adSize="BANNER"
        ads:adUnitId="ca-app-pub-3940256099942544/6300978111" /> <!-- Test Ad Unit ID -->
</LinearLayout>

 

Play Console에서 인앱 상품 설정