How to invoke a system-hidden API, or use a class that is not open to the system

First, reflection

System-hidden APIs can be invoked through reflection, but it does not seem to work well for classes that have already been hidden by the system.

Second, the use of the system source code compiled Classes.jar

Path: out/target/common/obj/java_libraries/framework_intermediates

When you add this jar package to your project, you will not have a red dot hint for the error ID when using system-related classes or hidden APIs.

It is important to note that:

1, identified in manifest: android:shareduserid= "Android.uid.system"

2, if using the system to hide the API or the class is not much, generally put into the source code to compile the APK;

How to invoke a system-hidden API, or use a class that is not open to the system