Launch activity in Android using adb shell

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To launch an activity in android using the adb shell, you can use the following:

adb shell am start -n com.example.package/com.example.package.ActivityClass

To avoid having to write the main package, you can do this

adb shell am start -n com.example.package/.ActivityClass

If you are already within an adb shell session, you can just do 

am start -n com.example.package/com.example.package.ActivityClass
# or
am start -n com.example.package/.ActivityClass