This app uses accessibility services.
+ Activity: An activity represents a single screen with a user interface.
+ Service: A service is a component that runs in the background to perform long running operations or perform jobs for remote processes.
+ Content providers: A content provider manages a shared set of application data.Through the content provider, other applications may query or even modify the data (if the content provider allows).
+ broadcast receivers: Broadcast receiver is a component that responds to system-wide broadcast messages.
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