Launch App via adb without knowing Activity name [duplicate]

Answer 1

Using latest versions (at least API 25) you can start the default Activity, without knowing its name, and not using monkey:

PKG=com.android.calculator2
adb shell am start $PKG/$(adb shell cmd package resolve-activity -c android.intent.category.LAUNCHER $PKG | sed -n '/name=/s/^.*name=//p')