AMS (Activity Manager Service)

Why AMS?

It performs date process and memory management of activities, services, content providers and broadcast receivers.

AMS RESPONSIBILITIES

• Manages and Schedules the activity life cycle of all applications.
• Start or Kill the process of the application.
• Start or Schedule the service life .
• Register BroadcastReceiver, and receive and distribute Broadcast.
• Start and publish ContentProvider.
• Scheduling tasks.
• Crash handling of Applications.
• Query the current operationg status of the android.

AMS Data Structure

Activity Record

AMS users mainly do data structures to handle these folders.

• Activity record and Tasks

Activity record is the base data structure, which records the characterisitcs of Single Activity.

Tasks is basically a collection of multiple activity records.

ActivityRecord.java

Tasks

Task has a one domain relationship with activity records. Task has many properties related to the management of multiple activity records and the task stack itself

Task.java

ProcessRecord

ProcessRecord.java

DUMPSYS Tool

• Get Status about System Services
• Extract Diagnostic information about services like AMS, WMS, PMS, bluetoot etc.
• Debugging System Services

DUMPSYS command

> adb shell dumpsys -l

• it will show you all the services which are currently running in the emulator.

> adb shell dumpsys

• if you want to know the latest of the current state of all the system services