How to wait for a task to finish, just like calling a function and accepting its result until it's done?

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Android

Android4x

Dear all,

I have been working on a android project, the problem I faced is that I need to wait for asyncTask/service/thread/runnable to finish its job and accept it's result when its done so that the operation continues synchronously, however, the code after the callings of asyncTask/service..continues to execute which I don't need it....I think I really have missed something basic concept..

The code below is what I have tried and I did not incorporated what the asyncTask does...within doInBackground it makes ussd call and automatically enters into while loop to get intercepted message...that there is a ussd interceptor which puts the message on a global shared preference..the while loop searches for this specific message and breaks automatically after matches...so my wish is to get this message and continue onto the next statement...

If my problem is clear enough, please help me.
Please feel free if my problem is not clear.

Thanks

What I have tried:

BackgroundMessageFinder asyncTask =
(BackgroundMessageFinder) new BackgroundMessageFinder(Global.context, this,
new BackgroundMessageFinder.AsyncResponse() {

@Override
public void processFinish(String output) {
// isAccountValid = Boolean.parseBoolean((output));
}
}).execute(Constants.PreferenceKey.UssdSmsMsg, "999", "457", "", "1234");

// try {
try {
String test = asyncTask.get(); // get some result

asyncTask.wait(10000);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}


// continue after fetching the required message