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@maxmp https://developer.huawei.com/consumer/en/doc/ https://devicepartner.huawei.com/cn/solutions/product/service-pack These websites may be helpful for your development.

Huawei officials said this function needs to be adapted by developers themselves. And HarmonyOS can recognize that Poweramp is a player. https://consumer.huawei.com/cn/support/content/zh-cn15940389/ https://consumer.huawei.com/cn/support/content/zh-cn15942423/