The ListView shows null pointer exception about material HOT 3 CLOSED

<com.rey.material.widget.ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/list"
        android:layout_gravity="center_horizontal"
        android:layout_weight="1"
        android:dividerHeight="0dp"/>

                ListView lv = (ListView) convertView.findViewById(R.id.list);
                final LocationAdapter adapter = new LocationAdapter(getActivity(), Arrays.asList(locations));
                lv.setAdapter(adapter);
                lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                        adapter.setSelected(position);
                    }
                });