2019 인앱결제(IAP, In app purchase)

Build.gradle(Project)

buildscript {
    ext.kotlin_version = '1.3.11'
    repositories {
        google()
        jcenter()
        mavenCentral()
    }

Build.gradle(Module)

implementation 'com.anjlab.android.iab.v3:library:1.0.44'

AndroidMenifest.xml

<uses-permission android:name="com.android.vending.BILLING" />

PlayConsole

1. App을 하나 등록

2. 출시관리 > 서비스 및 API 가서 키를 저장해놓음

3. 앱정보 > 인앱상품에서 상품등록

KeyInfo.kt

//인앱결제 라이센스 키
const val INAPP_PURCHAGE_KET = "API키"

키들은 따로 모아서 관리

IapTestActivity.kt

package com.empo.android.skct

import android.app.AlertDialog
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import com.anjlab.android.iab.v3.BillingProcessor
import com.anjlab.android.iab.v3.TransactionDetails
import com.empo.android.skct.util.INAPP_PURCHAGE_KET
import kotlinx.android.synthetic.main.activity_iap_test.*

class IapTestActivity : AppCompatActivity(), BillingProcessor.IBillingHandler {

    //IAP
    private val productIds = arrayOf("skct_play_package")
    private lateinit var bp: BillingProcessor //인앱결제


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

        initIap()
        initLayout()
    }


    private fun initLayout(){
        button.setOnClickListener {
            purchaseItem( productIds[0] )
        }
    }


    private fun initIap() {
        bp = BillingProcessor(this, INAPP_PURCHAGE_KET, this).apply {
            initialize()
        }
    }


    private fun showBasicDialog(msg: Int){
        val builder = AlertDialog.Builder(this)

        builder.run {
            setMessage( getText(msg) )
            setPositiveButton( "확인" ) { dialog, which -> }
            setCancelable(false)
        }
        builder.create().show()
    }


    private fun purchaseItem(productId: String){

        //인앱결제 초기화 실패
        if( !bp.isInitialized){
            showBasicDialog( R.string.iap_init_error )
            return
        }

        if( !bp.isPurchased(productId)){ //구매
            bp.purchase( this, productId )
        }else{
            //구매했으나 소비처리가 되지 않음
        }
    }




    override fun onBillingInitialized() {
    }

    override fun onPurchaseHistoryRestored() {
    }

    override fun onProductPurchased(productId: String, details: TransactionDetails?) {
    }

    override fun onBillingError(errorCode: Int, error: Throwable?) {
    }

}