Трамп высказался о непростом решении по Ирану09:14
In the coming weeks, Google will officially debut Android developer verification, which will require app makers outside the Play Store to register with their real names and pay a fee to Google. Failure to do so will block their apps from installation (sometimes called sideloading) on virtually all Android devices. Google says this is a necessary evolution of the platform's security model, but upending the status quo could push developers away from Android and risk the privacy of those that remain.
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Here’s how I finally got motivated.
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// if a register doesn't exist or its value is null, the map doesn't contain the key，详情可参考PDF资料
User warnings for applications that are directly installed (or “sideloaded”)