Common user most of time doesn't care about RAM of his android device, about processes that running on background etc.
User who know what is RAM install apps to clear it. But we are not common users and wont install apps to kill. We gonna kill them ourselves.

You must be root, have busybox and terminal emu installed.

You can use am force-stop <package name>.
or am kill <package name>.

am kill only kills "processes that are safe to kill": i.e. a process with no running services or activities.

We can use adb shell kill to kill the process. but first you need to find the process id.

adb shell kill $(adb shell ps | grep YOUR.PACKAGE.NAME | awk '{ print $2 }')

pc $ adb -d shell
android $ su
android # ps
android # kill <process id from ps output>

adb shell am force-stop

adb stop

adb -d install -r MyApp.apk ; adb -d shell am start -a android.intent.action.MAIN -n com.MyCompany.MyApp/.MyActivity

That way, you can issue this adb command to stop your activity:

adb shell am broadcast -a com.example.TestActivity.STOP

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