[android help] Timer to schedule a task

Timer to schedule a task

I need to check continously a variable's value. This is a value that I receive from the bluetooth's input stream, this is the reasson why I need to this be continuosly checking it.

What I need to do too, is that when i call the function, it returns to me the value saved in the variable in that moment.

For that, I'm doing this:

private final Handler refresh_handler = new Handler();

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    Runnable refresh_input = new Runnable() {
        @Override
        public void run() {
            bt_read_input = GlobalVar.bt_input;  //Save received value in a local variable
            refresh_handler.postDelayed(refresh_input, 500);
        }
    };
}

refresh_handler.post(refresh_input);  //Call to the function

This seems to be refreshing the variable every 0,5sec. But I still need that when I call it, it returns to me the actual variable's value, this is, bt_read_input's value in that moment.

How could I implement a function to do this as a timer, but also to return the variable's value to get it when I want?

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