Android TextView - Display Numbers Frame by Frame Showing Last Number

Question

I need to display a numbers(1-8) on single TextView like one by one and with sleeptime 1sec. here is my code

    for(int i=0;i<9;i++){
        TextView txt=(TextView)findViewById(R.id.txt);
        txt.setText(String.valueOf(i));
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

Do not use `sleep(1000)` on the ui thread. – Raghunandan Jun 13 '14 at 10:06 — Raghunandan, Jun 13 '14 at 10:06
@Raghunandan how to i implement this can u suggest me – sunil Jun 13 '14 at 10:07 — sunil, Jun 13 '14 at 10:07

score 3 · Accepted Answer · edited May 23 '17 at 12:27

3

Use a Handler or a CountDownTimer. Do not call sleep(param) on the ui thread. This blocks the ui thread. never block the ui thread.

Handler, it is bound to the thread / message queue of the thread that is creating it -- from that point on, it will deliver messages and runnables to that message queue and execute them as they come out of the message queue.

http://developer.android.com/reference/android/os/Handler.html

Regarding CountDownTimer

http://developer.android.com/reference/android/os/CountDownTimer.html

You can find example of both @

Android Thread for a timer

edited May 23 '17 at 12:27

Community

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answered Jun 13 '14 at 10:09

Raghunandan

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is there any problem using this code. handler will run every minute, when we open the app. new Handler().postDelayed(new Runnable() { @Override public void run() { if(i<9){ TextView txt=(TextView)findViewById(R.id.txt); txt.setText(String.valueOf(i)); ++i; } handler(); } }, 100); – sunil Jun 13 '14 at 10:24
You can stop the `Handler` when you want to. – Raghunandan Jun 13 '14 at 10:25
@sunil there i have mentioned in the last link. Check that – Raghunandan Jun 13 '14 at 10:27

score 0 · Answer 2 · answered Jun 13 '14 at 10:11

You can try using handler.

TextView txt=(TextView)findViewById(R.id.txt);
int i = 0;

Handler handler=new Handler();  

handler.post(runnable);  
Runnable runnable=new Runnable(){  
    @Override  
    public void run() {  
        txt.setText(String.valueOf(i));
        handler.postDelayed(runnable, 1000);  
        i++;
        if (i == 10)
        {
            handler.removeCallbacks(runnable);
        }
    }  
};

Hope it helps.

Android TextView - Display Numbers Frame by Frame Showing Last Number

2 Answers2