Android - ListView - performItemClick

Question

I\'m facing some difficults when I try to use the performItemClick funcion of the ListView.

All I want to do is to perform a click programatically i

Answer 1

This worked for me.

listView.performItemClick(
    listView.getAdapter().getView(position, null, null), position, position);

use the adapter to get the view for the position of the item. The other 2 parameters I didn't want so I left them null. Leaving convertView null causes the adapter to render a new view. It's a performance issue but since this is only happening once in a while it wont have much effect. I don't need to specify the parent for anything because I'm not using it.

position is just the spot where your item is located. Additionally these 2 lines of code before your performItemClick create the illusion of having the list item selected. They also ensure the appropriate item is on the screen.

listView.requestFocusFromTouch();
listView.setSelection(position);

Answer 2

When using Listview (simple array adapter or custom adapter) define listview and other finally make perform click.

For example:

 //At onCreate function:

lv = (ListView) findViewById(R.id.listView);
        lv.setAdapter(new CustomAdapter(List_item.this, list, images));


lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id)    {
// on click function works
    }
}


int position = 0;
lv.performItemClick(lv.getAdapter().getView(position, null, null), position, lv.getAdapter().getItemId(position));

Note: After creating the setOnItemClickListener only you should call perform click. Otherwise, it will not correctly.

Answer 3

This works for me:

listview.getSelectedView().performClick();

Answer 4

myListView.getChildAt(0) returns null because used this very soon.

use a delay for it.

or use below code:

private class MyAdapter extends BaseAdapter
{
private final Context context;
private HashMap<Integer, View> views;

public MyAdapter(Context context)
{
    this.context = context;
    views = new HashMap<>();
}

@Override
public View getView(int position, View convertView, ViewGroup parent)
{
    if(convertView == null)
    {
        if(views.get(position) == null)
        {
            final LayoutInflater layoutInflater = LayoutInflater.from(context);
            convertView = layoutInflater.inflate(R.layout.my_grid, null, false);

            views.put(position, convertView);
        }
        else
            convertView = views.get(position);
    }

    TextView tv = convertView.findViewById(R.id.langView);
    tv.setText(languageList.get(position));

    return convertView;
}
}

and

adapter = new MyAdapter(getActivity());
myListView.setAdapter(adapter);

Runnable r = new Runnable()
{
    @Override
    public void run()
    {
        myListView.performItemClick(adapter.getView(position, null, myListView), position, 0);
    }
};

myListView.postDelayed(r, 100);

Answer 5

Try this one:

public static boolean performClicKOnLisViewFromIndex(ListView listView, int index){
        if(listView != null){
            if(listView.getAdapter()!= null && listView.getAdapter().getCount() >0 && listView.getAdapter().getCount() > index ){
                listView.performItemClick(
                        listView.getAdapter().getView(index, null, null),
                        index, listView.getItemIdAtPosition(index));
                return true;
            }
        }
        return  false;
    }

Answer 6

If you would get weird result when using getView, this is because the list item you want does not exist within visible parts. Use below:

private View getViewFromAdapterByPosition(int position, ListView listView) 
{
        View view;
        int firstVisiblePos = listView.getFirstVisiblePosition();
        int lastVisiblePos = listView.getLastVisiblePosition();

        if (position < firstVisiblePos || position > lastVisiblePos) {
            view = listView.getAdapter().getView(position, null, listView);
        } else {
            view = listView.getChildAt(position - firstVisiblePos);
        }
        return view;
    }

And then,

listView.performItemClick(getViewFromAdapterByPosition(index, listView), index, 0);