Unsubscribing from an RxJava subscription to handle orientation changes

OC-RxUnsubscribeActivity.java

private Subscription mDoSomethingSubscription;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    
    setContentView(...);
    
    // Setup views
    ...
    
    // Start a background task
    mDoSomethingSubscription = getSomething()
        .subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe(
            something -> {
                // Display something
            });
}

private Observable<...> getSomething() {
    return ...;
}

@Override
public void onDestroy() {
    super.onDestroy();
    
    if (mDoSomethingSubscription != null && !mDoSomethingSubscription.isUnsubscribed()) {
        mDoSomethingSubscription.unsubscribe();
    }
}