Android：如何获取已安装活动的列表，因为它们出现在启动器中，没有重复项

I am writing an app that allows user to view the list of installed apps, select one of them and then start it on schedule. Using tutorials from stackoverflow i managed to figure out how to get a list of installed activities, their package names and icons(i.e. I am writing an app that allows user to view th