Question

I want to wait inside my while loop for like 1 second each time it is inside the loop.

I tryed with Runnable:

new Handler().postDelayed(new Runnable() 
{
    @Override
    public void run() 
    {
        int i=0;

        while(i<10){
            if(i%2 ==0){

                myTextView.setText("true");
            }
            else{

                myTextView.setText("false");
            }

            i++;
        }
    }
}, 1000);

If i ran this code i got a blank display for minutes and then a crash.

Logcat:

 ActivityManager      Reason: keyDispacthingTimeot

What is the problem?
I would like to make this as simple as it can be…

Please help!

Answer 1

If you want to make sthg very simple, then just use

Thread.currentThread();
Thread.sleep(1000);

Note: as Adeel said, do not sleep in a UI thread =)

EDIT: you should implement sthg like this:

I think you want to use a asyncTask, and publishprogress each one sec. So make your own asyncTask<Void, Integer, Void>, and on the doInbackground method:

protected Void doInBackground(Void... params) {
    int i=0;

    while(i<10){
        Thread.currentThread();
        try{
            Thread.sleep(1000);
        }catch(Exception e){
            return null;
        }

        publishProgress(new Integer(i));

        i++;
    }
}

Then implement the onProgressUpdate method which runs on UI thread, and:

protected void onProgressUpdate(Integer... progress) {
     int i = progress[0].intValue();
     if(i%2 ==0){
            myTextView.setText("true");
        }
        else{

            myTextView.setText("false");
        }
 }

Here is the doc about asynctasks