为了确保Android应用在多用户环境中正确运行，开发者可以将应用指定为单例。通过在AndroidManifest中设置android:singleUser属性为true，可以使得服务或提供者组件仅在用户0的进程中实例化。所有对该服务或提供者的请求都将被路由到用户0的进程。如果这是应用中唯一的组件，则整个应用将只运行一个实例。
Android multiple user support
To identify an app as a singleton, Add android:singleUser=”true” to your service or provider in the Android manifest.
The system will instantiate that component in the process running as user 0 only. Any requests to connect to that provider or service from any user will be routed to the process in user 0. If this is the only component in your app, only one instance of your app will run.
Activities in your package will still be launched in a separate process for each user, with the UID being in the UID range for that user (such as 1010034).1
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