在部分手机上，例如小米
集成google的in app billing时，点击购买（或者说调起launchBillingFlow方法）无响应，会打印如下日志：
BillingHelper: Got null intent!
BillingClient: Unexpected null bundle received!
2019-10-08 16:27:59.237 19767-19767/com.isaidamier.kotlin.trivialdrive D/MakePurchaseFragment: starting purchase flow for SkuDetail:
AugmentedSkuDetails(canPurchase=true, sku=gold_monthly, type=subs, price=IDR 14,000.00, title=Gold Status Monthly Subscription (Trivial Drive Kotlin Real), description=Bathe in the golden sunset, originalJson={"skuDetailsToken":"AEuhp4Kv45RXLI-vdHdT3TYRZrEK4BHUdnRC0gJHRGtxXBBvhShKATTR6bkeSk_8SaVI","productId":"gold_monthly","type":"subs","price":"IDR 14,000.00","price_amount_micros":14000000000,"price_currency_code":"IDR","subscriptionPeriod":"P1M","title":"Gold Status Monthly Subscription (Trivial Drive Kotlin Real)","description":"Bathe in the golden sunset"})
2019-10-08 16:27:59.257 19767-19820/com.isaidamier.kotlin.trivialdrive D/ViewContentFactory: initViewContentFetcherClass
2019-10-08 16:27:59.257 19767-19820/com.isaidamier.kotlin.trivialdrive I/ContentCatcher: ViewContentFetcher : ViewContentFetcher
2019-10-08 16:27:59.258 19767-19820/com.isaidamier.kotlin.trivialdrive D/ViewContentFactory: createInterceptor took 1ms
2019-10-08 16:27:59.281 19767-19767/com.isaidamier.kotlin.trivialdrive W/BillingHelper: Got null intent!
2019-10-08 16:27:59.282 19767-19767/com.isaidamier.kotlin.trivialdrive W/ProxyBillingActivity: Activity finished with resultCode 0 and billing's responseCode: 6
2019-10-08 16:27:59.307 19767-19767/com.isaidamier.kotlin.trivialdrive W/BillingClient: Unexpected null bundle received!
这是因为GooglePlay商店的 【后台弹出界面】的权限关闭了，打开即可
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