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Trivial Drive Kotlin

  1. Checkout the following repo: https://github.com/android/play-billing-samples
  2. Open the project "TrivialDriveKotlin" in Android Studio
  3. Replace the billing library reference in TrivialDriveKotlin/app/build.gradle for our library that you can get here:....
implementation "com.android.billingclient:billing-ktx:$version_billing"

for:

releaseImplementation "com.android.billingclient:billing:$version_billing"

debugImplementation "dev.iap.android.billingclient-ktx:billing_5_1:1.0.0"
  1. Add the following: android.jetifier.blacklist=bcprov. Souce: https://github.com/robolectric/robolectric/issues/6521

This method has been deprecated since v4.0.0 In that same file, add the following in line 752:

case 0: // Pull request submitted: https://github.com/android/play-billing-samples/issues/465
                                    br = billingClient.launchBillingFlow(activity,
                                            billingFlowParamsBuilder.build());
                                    if (br.getResponseCode() == BillingClient.BillingResponseCode.OK) {
                                        billingFlowInProcess.postValue(true);
                                    } else {
                                        Log.e(TAG, "Billing failed: + " + br.getDebugMessage());
                                    }

Replace jcenter() for mavenCentral() In the AndroidManifest.xml file, 

<activity
            android:name="com.sample.android.trivialdrivesample.ui.MainActivity"
            android:label="@string/title_game_fragment"
            android:exported="true"> <!-- Add this attribute if compiling with newer version of Android -->

Change the key : base64EncodedPublicKey="null" in local.properties to the value you can download from the console under: /organizations/{your org}/projects/{your project}/android make sure you use the Public key. Use the Copy to clipboard icon which will give you the value with no line breaks and no header and footer which is the expected way

Initialize the Iap SDK in the BillingDataSource's constructor just before the BillingClient is being constructed.