how to stop a function from running code until a condition is met

Question

Here is a simplified version of my code. function1() has to check something on the internet. It has to do it in the background of the app(I cannot change that), which allows the rest of the code to run while it checks the internet. This function can take several seconds to complete. I cannot put the log at the end of function 1 because it needs to run whether function1 is successful or not, but only after it is done trying. How can I achieve this without using a timer?

if (condition) {

    if (condition2) {
        function1();
    }

    Log.i("Info", "This should not appear until function1 completes or fails");
}

Answer 1

Don't constantly check; this is called busy waiting and is inefficient, especially on mobile (since the device can't go into low-power mode). Instead, use an AsyncCallback to run your function1 and put the log message in the callback.