我有一个可由用户更新的列表,但notifyDataSetChanged()
不适用于与listView
. 我在片段中使用它。数据库得到更新,但 adpater 没有。以下是我的实现:
我的主要片段:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
myArrayList = new ArrayList<myList>();
myArrayList = Database.getSharedObject(getActivity()).getMyList();
if (myArrayList != null && myArrayList.size() > 0) {
adapter = new myListAdapter(getActivity(), 0, myArrayList);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.mainfragment, container, false);
myListView = (ListView) v.findViewById(R.id.my_list_view);
myListView.setOnItemClickListener(this);
if (adapter != null) {
myListView.setAdapter(adapter);
}
return v;
}
在一些导航过程列表被更新并且在我的onResume()
方法中我从数据库中获取更新的列表并调用notifyDatasetChanged()
不更新我的视图的方法之后,但是来自数据库的相应数组被更新了一个。
@Override
public void onResume() {
super.onResume();
myArrayList = Database.getSharedObject(getActivity()).getMyList();
adapter.setItems (myArrayList);
adapter.notifyDataSetChanged();
}
我的列表适配器
public class MyListAdapter extends ArrayAdapter<Message> {
private ArrayList<Message> myList;
/* Context */
private Context context;
public void setItems (ArrayList<Message> myList) {
this.myList = myList;
}
public MyListAdapter (Context context, int textViewResourceId, ArrayList<Message> myList) {
super(context, textViewResourceId, myList);
this.context = context;
this.myList = myList;
}
@Override
public View getView (int position, View v, ViewGroup parent) {
// Keeps reference to avoid future findViewById()
MyViewHolder viewHolder;
if (v == null) {
LayoutInflater li = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = li.inflate(R.layout.list_row, parent, false);
viewHolder = new MyViewHolder();
viewHolder.txtImage = (ImageView) v.findViewById(R.id.message_icon);
viewHolder.txtMessage = (TextView) v.findViewById(R.id.message);
viewHolder.txtDate = (TextView) v.findViewById(R.id.date);
v.setTag(viewHolder);
} else {
viewHolder = (MyViewHolder) v.getTag();
}
Message myMessage = new Message();
myMessage = myList.get(position);
if (myMessage != null) {
viewHolder.txtMessage.setText(myMessage.getText());
viewHolder.txtDate.setText(myMessage.getDate());
}
return v;
}
static class MyViewHolder {
ImageView txtImage;
TextView txtMessage;
TextView txtDate;
}
}
对出了什么问题有任何想法吗?为什么列表视图没有更新?任何帮助表示赞赏。