BillingHelper

Wrapper around Google Play Billing Library, simplifying its use. Handles client connection, querying sku details, owned purchase, different purchase types, acknowledging purchases etc.

How does it work?

Make sure your Activity/Fragment implements BillingListener and initializes BillingHelper

class MainActivity: AppCompatActivity(), BillingListener {

    lateinit var billing: BillingHelper

    override fun onCreate(savedInstanceState: Bundle?, persistentState: PersistableBundle?) {
        super.onCreate(savedInstanceState, persistentState)

        // construct helper, throw in context, supported skus (for query puproses)
        // and a callback listener
        billing = BillingHelper(
                context = this, 
                skuNames = listOf("inAppPurchaseSkuName1", "inAppPurchaseSkuName2", "subscriptionSkuName")
                billingListener = this)
    }

    override fun onDestroy() {
        super.onDestroy()
        // make sure to clean it up when you're done
        billing.endBillingClientConnection()
    }

    override fun onBillingEvent(event: BillingEvent, message: String?) {
        // receive an event based on calls to billing
    }
}

Use any of its public methods, BillingHelper will do all the heavy lifting and always report changes via BillingListener

fun consumePurchase(purchase: Purchase)

fun endBillingClientConnection()

fun getSkuDetails(skuName: String): SkuDetails?

fun isBillingReady(): Boolean

fun isPurchased(skuName: String): Boolean

fun launchPurchaseFlow(activity: Activity, skuName: String)

fun launchPriceChangeConfirmationFlow(activity: Activity, skuDetails: SkuDetails)

fun getPurchaseForSkuName(skuName: String): Purchase?

fun initQueryOwnedPurchases() // by default handled automatically 

fun initQuerySkuDetails() // by default handled automatically 

fun addBillingListener(@UiThread listener: BillingListener)

fun removeBillingListener(listener: BillingListener)

BillingEvent includes all of the things you might be interested in, served via BillingListener

enum class BillingEvent {
    BILLING_CONNECTED,
    BILLING_CONNECTION_FAILED,
    BILLING_DISCONNECTED,
    QUERY_SKU_DETAILS_COMPLETE,
    QUERY_SKU_DETAILS_FAILED,
    QUERY_OWNED_PURCHASES_COMPLETE,
    QUERY_OWNED_PURCHASES_FAILED,
    PURCHASE_COMPLETE,
    PURCHASE_FAILED,
    PURCHASE_CANCELLED,
    PURCHASE_ACKNOWLEDGED,
    PURCHASE_ACKNOWLEDGE_FAILED,
    CONSUME_PURCHASE_SUCCESS,
    CONSUME_PURCHASE_FAILED,
    PRICE_CHANGE_CONFIRMATION_SUCCESS,
    PRICE_CHANGE_CONFIRMATION_CANCELLED,
}

Great! How do I get started?

Make sure root build.gradle repositories include JitPack

allprojects {
    repositories {
        maven { url 'https://jitpack.io' }
    }
}

And BillingHelper dependency is added to app build.gradle

dependencies {
    implementation "com.github.mvojtkovszky:BillingHelper:$latest_version"
}