Add kotlin snippets for User Billing

[sidd607]

Add Kotlin code snippets for Play Billing Choice integration

Description

This PR adds the Kotlin code snippets for the Billing Choice integration guidance to the playbilling module.

The snippets have been implemented in a new file: playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt.

To support the new Billing Choice APIs, the Play Billing Library dependency has been upgraded to 9.1.0.

Changes in addition to the snippet

• Fix Double-Resume Crash: suspendCancellableCoroutine could attempt to resume a continuation multiple times if the billing service disconnected after a successful connection. Added continuation.isActive checks to safeguard this.
• Idiomatic Kotlin (SAM Conversions): Refactored createBillingProgramReportingDetailsAsync to use a lambda instead of an anonymous BillingProgramReportingDetailsListener object.

[snippet-bot]

Here is the summary of changes.

You are about to add 15 region tags.

• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:59, tag android_playbilling_billingchoice_connect_google_rendered_in_app
• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:109, tag android_playbilling_billingchoice_verify_google_rendered_in_app
• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:130, tag android_playbilling_billingchoice_launch_google_rendered_in_app
• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:146, tag android_playbilling_billingchoice_connect_developer_rendered_in_app
• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:194, tag android_playbilling_billingchoice_verify_developer_rendered_in_app
• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:222, tag android_playbilling_billingchoice_info_developer_rendered_in_app
• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:249, tag android_playbilling_billingchoice_create_token_developer_rendered_in_app
• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:276, tag android_playbilling_billingchoice_verify_google_rendered_external_link
• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:303, tag android_playbilling_billingchoice_create_token_google_rendered_external_link
• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:332, tag android_playbilling_billingchoice_launch_google_rendered_external_link
• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:349, tag android_playbilling_billingchoice_verify_developer_rendered_external_link
• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:378, tag android_playbilling_billingchoice_launch_external_developer_rendered_external_link
• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:412, tag android_playbilling_billingchoice_subs_replace_google_rendered_in_app
• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:453, tag android_playbilling_billingchoice_subs_replace_google_rendered_external_link_sample1
• playbilling/src/main/java/com/example/pbl/kotlin/billingchoice/Integration.kt:484, tag android_playbilling_billingchoice_subs_replace_google_rendered_external_link_sample2

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[gemini-code-assist]

Code Review

This pull request updates the playbilling dependency to version 9.1.0 and introduces a new Integration class to handle various Google Play Billing Choice integration scenarios. The review feedback highlights a critical issue where the class-level billingClient property is shadowed locally within connection methods instead of being reassigned, which requires changing the property to a var. Additionally, several redundant self-assignments and an unused import should be cleaned up to improve code quality.

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[gemini-code-assist]

The billingClient property is declared as a read-only val. However, inside startConnectionGoogleRenderedInApp and startConnectionDeveloperRenderedInApp, a new BillingClient instance is built locally and shadows this property. This local instance is discarded after the connection method finishes, meaning other methods in this class will continue to use the original, unconfigured billingClient passed to the constructor.\n\nTo fix this, change private val billingClient to private var billingClient so that the newly configured instance can be reassigned to the class property.

Suggested change

	private val purchasesUpdatedListener: PurchasesUpdatedListener
	private var billingClient: BillingClient,

[gemini-code-assist]

Remove the val keyword to reassign the newly built and configured BillingClient to the class-level billingClient property instead of shadowing it.

Suggested change

	.enablePendingPurchases(pendingPurchasesParams)
	billingClient = BillingClient.newBuilder(context)

[gemini-code-assist]

Remove the val keyword to reassign the newly built and configured BillingClient to the class-level billingClient property instead of shadowing it.

Suggested change

	.enableBillingProgram(params)
	billingClient = BillingClient.newBuilder(context)

[gemini-code-assist]

The import com.android.billingclient.api.BillingProgramReportingDetailsListener is unused and can be safely removed.

[gemini-code-assist]

This self-assignment is redundant and triggers a compiler warning because activity is already available as a class property. You can safely remove this line.

[gemini-code-assist]

This self-assignment is redundant and triggers a compiler warning because externalTransactionId is already available as a parameter of the function. You can safely remove this line.

[gemini-code-assist]

This self-assignment is redundant and triggers a compiler warning because externalTransactionId is already available as a parameter of the function. You can safely remove this line.