You want to launch favorite app on your smart phone without touch, You should install "Wake up your app"

Just shake your smart phone, then your app will be waked up.

You can select favorite app on Left & Right gesture, and second favorite app on Up & Down gesture, and you shake your smart phone.

Anywhere, Anytime, Just shake, then your favorite app will be waked up.
You can use "Wake up your app" when you are in danger.