To measure average Activity startup time

launcTime.sh

# To measure lauch time
fun launchTime(){
	
	# Config
	LAUNCH_COUNT=10
	REGEX='TotalTime: (\d+)'
	
	# The two params are configurable via argument
	DEFAULT_PACKAGE_NAME='com.your.packagename'
	DEFAULT_ACTIVITY_NAME='com.my.packagename.MainActivity'
	PACKAGE_NAME="${1:-$DEFAULT_PACKAGE_NAME}"
	ACTIVITY_NAME="${2:-$DEFAULT_ACTIVITY_NAME}"

	echo "Initiating launch time measurement for $PACKAGE_NAME/$ACTIVITY_NAME (launhCount=$LAUNCH_COUNT)"

	# Launching 
	TIME_SUM=0
	for ((i = 0 ; i < LAUNCH_COUNT ; i++)); do
		TIME=$(
			adb shell am force-stop $PACKAGE_NAME &&  
			adb shell am start-activity -W -n $PACKAGE_NAME/$ACTIVITY_NAME | pcregrep -o1 "$REGEX"
			)
		TIME_SUM=$(($TIME_SUM + $TIME))
		echo "launch $(($i+1)) -> launch time is $TIME ms"
	done

	# Measuring
	AVG=$(($TIME_SUM / $LAUNCH_COUNT))
	echo "Average is $AVG ms"
}