Setting a Variable Once... I don't Know How to Explain (Android Projgramming)

This is kind of hard to explain, so i'll try the best I can to inform you on 开发者_如何学运维my problem. I have a variable that changes every now and then. In the main app activity i have

int count = 0;

(count is the variable) I would like to only set that at the very beginning. The first time a viewer opens it up I want to set it to 0. After that, I want to save it every time the viewer leaves, and load it when the viewer opens the app back up.

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you write that before any of your function begins.

like

private int count=0;

public static void FunctionBegins() { ... }