Ever wish you could access the alarms screen of Android's clock, instead of going to the main screen first? Or that you could access the Tethering page of Settings without having to make three taps? Most third-party launchers have this ability built-in. Huh989 over at Hackerspace shows us how:
Everyone may already have known this, but it was new to me, so I thought I'd pass it on.
While many apps have enabled certain screens (aka "Activities") to be easily made into shortcuts via the Android "Add Shortcut" ability (e.g. Settings>Tethering Setup), I had no idea that you can add pretty much any and all application screens. For example, the stock Clock app does not allow for shortcuts directly to the Alarms page by default, however using this method, you can add that as a shortcut to your homescreen without a problem.
This seems to be a feature available based on the launcher. Nova and Apex Launchers support it, but not the default launcher. There's a workaround with an app if you're using the default launcher. It's pretty simple and most people probably already know this, but it was a revelation to me.
To get started, long-press Nova Launcher’s home screen and select Shortcuts. The process should be similar on other popular third-party launchers.
Select the Activities option to create an activity shortcut.
So if you have a commonly used screen that you use all the time, see if you can add it as a shortcut.
It seems you can use Tasker to launch activities too as long as you have the Tasker Plugin AutoShortcut installed and you are using a launcher that allows you to access the "Activities" list from it's shortcut screen (like Nova or Apex). To do so, install AutoShortcut and when picking your action choose: Plugin>AutoShortcut ; Edit>Activities (from the list of shortcuts); then just pick your activity! If you're using the default launcher, you'll still have to use the suggested shortcut creation app listed above, as well as these steps.
Source: How-To Geek