Why can't I remove an item?

问题:

I am really frustrated because I have been trying this for 4 hours today, and I can't find a solution. For some reason, my on long click listener doesn't get detected sometimes!

 listview.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
                                       int pos, long id) {

            Toast.makeText(MainActivity.this, "Long click", Toast.LENGTH_SHORT).show();

            contactArrayList.remove(pos);
            arrayAdapter.notifyDataSetChanged();


            return true;
        }
    }); 

This simple code just removes an item from my list and my array list using an adapter. But, sometimes, the onItemLongClickListener doesn't even get called, and the toast doesn't even display!! I know that android is detecting it, because I get this message whenever I long click in my log cat:

/ViewRootImpl: ViewRoot's Touch Event : ACTION_UP

So why does it only work sometimes? Is there something wrong with my code, or is this a problem with android itself? If it is a problem with android, how can I fix it?

It works the first time, but after exiting my app, rotating the screen, etc. , Long press stops getting detected. I have been stuck on this for almost 8 hours now, and I really, really, really need your help.

回答1:

May be try using View.OnItemLongClickListener() instead of AdapterView and change the parameter in OnItemLongClick() to View.

Hope this helps...