Null pointer in customelist ListView in fragment

Question

getting NullPointerException while setting custom adapter to listview. my ListView is in Fragment. ............................................................................................................................................

Class 1:

public class Fragment_chats extends Fragment {
ListView lv;
    String[] namem={"Gauri","Jayesh","Nitya","Rupali","Lalit","Poonam"};
    Integer[] imgm=    {R.mipmap.a,R.mipmap.b,R.mipmap.c,R.mipmap.d,R.mipmap.e,R.mipmap.f};

public Fragment_chats() {
    // Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    }


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
super.onCreate(savedInstanceState);
   View v= inflater.inflate(R.layout.fragment_fragment_chats, container, false);
    lv=(ListView)getActivity().findViewById(R.id.lv);
    customList cl=new customList(getActivity(),imgm,namem);
    lv.setAdapter(cl);
    return v;
}

}

Class 2:

class customList extends ArrayAdapter
{
    Activity act;
    String[] na;
    Integer[] img;
public customList(Activity context, Integer[] resource, String[] objects) {
    super(context, R.layout.chats, objects);
    act=context;
    na=objects;
    img=resource;

}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView == null)
    {
        convertView = View.inflate (act,R.layout.chats, null);
    }
    ImageView iv= (ImageView) convertView.findViewById(R.id.imageView);
    TextView name=(TextView)convertView.findViewById(R.id.textView1);
    TextView chat=(TextView)convertView.findViewById(R.id.textView2);
    iv.setImageResource(img[position]);
    name.setText(na[position]);
    chat.setText("chat");

    return convertView;
}
}

Custom layout is R.layout.chats and fragment layout is R.layout.fragment_fragment_chats

score 3 · Accepted Answer · answered Nov 04 '16 at 12:25

3

You have an error in onCreateView method

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
super.onCreate(savedInstanceState);
   View v= inflater.inflate(R.layout.fragment_fragment_chats, container, false);
    lv=(ListView)getActivity().findViewById(R.id.lv); //<-this line has error
    customList cl=new customList(getActivity(),imgm,namem);
    lv.setAdapter(cl);
    return v;
}

replace this line

lv=(ListView)getActivity().findViewById(R.id.lv);

with this

lv=(ListView)v.findViewById(R.id.lv);

answered Nov 04 '16 at 12:25

siddhesh

1,365
1
10
16

Thanks....!!! it works – Bipin Gawand Nov 04 '16 at 12:29
@BipinGawand Accept this answer – IntelliJ Amiya Nov 04 '16 at 12:30
mark it as accpeted answer – siddhesh Nov 04 '16 at 12:30

score 2 · Answer 2 · answered Nov 04 '16 at 12:27

2

NullPointerException is thrown when an application attempts to use an object reference that has the null value.

You should call View object instead of getActivity().

Don't

lv=(ListView)getActivity().

Do

lv=(ListView)v.

answered Nov 04 '16 at 12:27

IntelliJ Amiya

73,189
14
161
193

Null pointer in customelist ListView in fragment

2 Answers2