NullpointerException when setting adapter for listview in dialog

Question

I want to display a custom dialog that have a listview inside it. First take a look on my code below.

Dialog:

protected void onPostExecute(String file_ur         


        

Answer 1

Inflate your view and use the object returned by the inflater to look for the ListView inside the layout

View view = inflater.inflate(R.layout.dialog_add, null)
ListView lv = (ListView) view.findViewById(R.id.lvAddDialog); 
ListviewContactAdapter adapter = new ListviewContactAdapter(getActivity(), listContact);
lv.setAdapter(adapter);             
builder.setView(view);

Answer 2

Change this:

ListviewContactAdapter adapter = new ListviewContactAdapter(getActivity(), listContact);

to this:

ListviewContactAdapter adapter = new ListviewContactAdapter(YourCLassName.this, listContact);

OR, may be you didn't initialize listContact

Answer 3

When you get the ListView yet not set te layout in the Dialog. You need build first your dialog and after get the ListView

Check this:

protected void onPostExecute(String file_url) {
    btnInvite.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {

            LayoutInflater inflater = getActivity().getLayoutInflater();

            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());


            builder.setView(inflater.inflate(R.layout.dialog_add, null))
            .setTitle("Invite people")                  
            .setNegativeButton("Cancel", new OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // TODO Auto-generated method stub
                    dialog.cancel();
                }
            });                                 
            Dialog dialog = builder.create();

            ListView lv = (ListView) dialog.findViewById(R.id.lvAddDialog); 
            ListviewContactAdapter adapter = new ListviewContactAdapter(getActivity(), listContact);
            lv.setAdapter(adapter);     
            dialog.show();                  
            }
    });
 }

}