current_activity.sh

oldActvity=""
displayName=""
currentActivity=`adb shell dumpsys window windows | grep -E 'mCurrentFocus'`
while true
do
	if [[ $oldActvity != $currentActivity && $currentActivity != *"=null"* ]]; then
		displayName=${currentActivity##* }     // 删除最后一个空格，及其左面的字符串
		displayName=${displayName%%\}*}        // 删掉第一个\ } 及其右面字符串
		echo $displayName
		oldActvity=$currentActivity
	fi
	currentActivity=`adb shell dumpsys window windows | grep -E 'mCurrentFocus'`
done