Update TextView every second in Android [duplicate]

Answer 1

You should use RxJava library to do so:

Subscription s =
                Observable.interval(1, TimeUnit.SECONDS)
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(v -> {
                    // update your ui here
                }, e -> {

                });

        // call when you no longer need an update:
        if (s != null && !s.isUnsubscribed()){
            s.unsubscribe();
            s = null;
        }

That's it. Do NOT use .postDelay(), Timer because it is error prone.