(Source code introduction
This effect is not easy for me to explain. After thinking for a long time, I described it in this way, which is convenient for everyone to search. In fact, the implementation is very simple, but I personally think it is very easy to use, mainly for the use of the slidedraw class. To see the effect, you can place various layouts and components. In this example, only one textview is placed, so you can use it to make your own menu settings.)