Meassure 1000 miliseconds most accurately (update every 10 ms)

Question

I am trying to create an app which sends sms. As confirmation I requires user to hold down a "Send" button for one second. I am showing a progress bar which acts like countdown timer for them. I wanted to update progress of progress bar every 10 miliseconds and increment it by 1. By this approach I would get 100% progress in exactly 1 second. But I was not able to be that accurate. I have tried, runnables and countdown timers but everything failed.

Right now I am using this "hack" which uses time difference in milis to calculate progress add:

progressBar = (ProgressBar) findViewById(R.id.progressBarSend);
handler = new Handler();
final Runnable runnable = new Runnable() {
    @Override
    public void run() {
        if(progressStatus <= 100) {
            progressStatus += (int)((System.currentTimeMillis() - currentTime)/10f);
            currentTime = System.currentTimeMillis();
            progressBar.setProgress(progressStatus);
            handler.postDelayed(this, 10);
        }else{
            handler.removeCallbacks(this);

        }
    }
};

By this approach I have got +- 200ms accuracy on emulator. Is there any better way to be even more accurate?

Thanks in forward

.... or update the progress bar every 100 miliseconds and increment it by 10. — Phantômaxx, Jul 04 '15 at 17:39
it wouldnt be as smooth as I wanted. I am targetting API level 10+ so I cant use smoth transitions which are available (if I am correct) from API level 11 — horin, Jul 04 '15 at 17:45
I am running it on core i7 4700MQ CPU so I dont think CPU is problem. Anyway my solution dont work on real device it is stucked at 5% progress or so — horin, Jul 04 '15 at 18:13
Use SystemClock http://developer.android.com/reference/android/os/SystemClock.html — ecle, Jul 05 '15 at 05:33

score 1 · Answer 1 · answered Jul 04 '15 at 18:02

1

The smoothest progress that I could achieve was by using ObjectAnimator. I also tried with an AsyncTask but the transition wasn't smooth enough in the first 100-200 milliseconds. You can try with this and have a look.

ObjectAnimator animation = ObjectAnimator.ofInt(progressBar, "progress", 100);
animation.setDuration(1000);
animation.start();

answered Jul 04 '15 at 18:02

Antrromet

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unfortunately I cant use this because I am targeting devices from API level 10 and ObjectAnimator was only introduced in API Level 11 – horin Jul 04 '15 at 18:16
If you're satisfied with the above code in higher APIs then you can use [NineOldAndroids](http://nineoldandroids.com/). It supports ObjectAnimator that works from API 1 onwards. – Antrromet Jul 04 '15 at 18:18

score 0 · Answer 2 · answered Jul 04 '15 at 17:52

Use CountDownTimer, it takes 2 parameters: 1. HowLong till onFinish is called and end the timer.Eg: 1000ms 2. OnTick to be called at what time.Eg: 10 ms

In OnTick just add code to update the progressbar. Below is an example code which is using a simple ProgressDialog which updates time every 10ms and shows progress from 1 to 100%.

final ProgressDialog progressdialog = ProgressDialog.show(getActivity(), "Will Send SMS", "Please hold on");
final CountDownTimer timer = new CountDownTimer(1000, 10) {
    @Override
    public void onTick(long millisUntilFinished) {
        Log.v("ranjapp", "Ticking " + millisUntilFinished / 10);
        progressdialog.setMessage("Will send SMS in " + millisUntilFinished / 10+" %");
    }

    @Override
    public void onFinish() {
        Log.v("ranjapp", "Countdowntimer onfinish called");
        progressdialog.dismiss();
    }
}.start();

You can change the above from ProgressDialog to any other progress dialogs.

I said that I have tried countdowntimer. I have got a lot worse accuracy with it than with runnables and handler — horin, Jul 04 '15 at 18:14
Frankly 1000ms is too little to be viewed in a progressbar. Rather than programming it you can create a gif image which finishes its cycle in 1 sec, that would be smoother. — Psypher, Jul 04 '15 at 18:17
unfortunately this also isnt the way because I want the progress bar to go back if it isnt fully loaded and user releases button... I will probably need to think about other way of confirmation — horin, Jul 04 '15 at 18:20

Meassure 1000 miliseconds most accurately (update every 10 ms)

2 Answers2