How to make TextWatcher wait for some time before doing some action

Question

I have an EditText to filter the items in the ListView below it, which may contain more than 1000 items usually. The TextWatcher is:

Answer 1

How can I make the textWatcher wait for 1-2 secs and if no more input happens after 2 secs, then filter the list.

As I already said in the comment you should look into using the getFilter() method of the adapter. As that may not be suitable(as you say) try to implement the same mechanism the adapter's filter uses to cancel in between filter inputs.

private Handler mHandler = new Handler();

public void afterTextChanged(Editable s) {
      mHandler.removeCallbacks(mFilterTask); 
      mHandler.postDelayed(mFilterTask, 2000);
}

where filterTask is:

Runnable mFilterTask = new Runnable() {

     @Override
     public void run() {
          fillItemList();
     }       
}

Answer 2

Using RxBinding :

RxTextView.textChanges(edittext)
            .skipInitialValue()
            .debounce(TIME_TO_WAIT, TimeUnit.MILLISECONDS)
            .subscribe({
               //do the thing
            })
}