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How to limit the use time of eternal software source code?
You need to use make to compile the source code in the Android system environment:

1. Add the attribute "Android: Shared Userid =" Android.uid.system "to the manifest node in AndroidManifest.xml of the application.

2. Modify the Android.mk file and add the line LOCAL_CERTIFICATE := platform.

3. Compiled by mm command, the generated apk has the right to modify the system time.