[andiwand]

Problem

A user bought the ad removal in Lite, but the app shows ads. Commit bf8e410 removed the Play Billing library in 2023. Since then, Lite knows about a purchase only from the local preference purchaseAcknowledged. If a buyer reinstalls the app, clears its data, or changes device, the preference is gone and the ads come back.

Change

• Lite links com.android.billingclient:billing:9.1.0 again. Pro and Foss do not link it, and only the Lite manifest has the BILLING permission.
• OwnedPurchases (src/ads) asks Play for owned INAPP and SUBS purchases. The app sold remove_ads_subscription until 2022, so the query includes subscriptions. src/noAds has a no-op version.
• BillingManager runs the query at each start without the preference. If Play reports a purchase in the state PURCHASED, it saves the preference, removes the ads, updates the consent info, and refreshes the landing screen.

Notes

• On the first start after a reinstall, ads show until Play answers.
• The app never revokes a purchase, as before. An ended subscription still keeps the ads off.
• The Data safety form in Play Console may need a check, because Lite links the billing library again.

Tests

• assembleLiteDebug, assembleProDebug, assembleFossDebug, lintLiteDebug, spotlessCheck, and testProDebugUnitTest pass.
• Not tested with a real purchase: that needs an account that owns the old product.

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