notifyDataSetChanged的Andr​​oid的ListView [英] notifyDataSetChanged Android ListView

问题描述

我有一个项目清单在我的应用程序类：

I have a list of items in my Application class:

public class MyApp extends Application {
   private static ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();
   //GET AND SET
}

我会在ListView中使用它。
我有一个按钮，在MyApp的列表中添加一个元素：

I would to use it in ListView. I have a button to add one element in MyApp list:

public void addBase(View view){
   MyApp.add2List(....); //add to MyApp.list
   adapter.notifyDataSetChanged();
}

和在同一个活动我设置的ListView：

And in the same activity I set ListView:

list=(ListView)findViewById(R.id.list_view);         
adapter=new MyListAdapter(this, R.layout.list_item, Session.getList());
list.setAdapter(adapter);

这是我的适配器：

And this is my adapter:

public class MyListAdapter extends ArrayAdapter<HashMap<String, String>> {

  private Context _context;
  private Activity activity;
  private ArrayList<HashMap<String, String>> data;
  private static LayoutInflater inflater=null;

  public MyListAdapter(Context context, int resourceId, ArrayList<HashMap<String, String>> items) {
    super(context, resourceId, items);
    this.data = items;
    _context = context;
    activity = ((Activity)context);
    inflater = activity.getLayoutInflater();    
  }


   public View getView(final int position, View convertView, ViewGroup parent) {
      View vi=convertView;
      final ArrayList<HashMap<String, String>> list = Session.getList();
      if(convertView==null){
         vi = inflater.inflate(R.layout.list_item, null);

         ImageButton delete = (ImageButton)vi.findViewById(R.id.delete_item);
         delete.setOnClickListener(new Button.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        list.remove(position);
                        notifyDataSetChanged();
                    }
                });

      }
      return vi;
  }

我用的 notifyDataSetChanged（）方式，但它不工作！没有更新列表视图。结果
如果再次尝试创建适配器时，添加按钮的工作。

I used notifyDataSetChanged() method, but it doesn't work !! No update to listview.
If try to create adapter again, the add button work.

adapter=new MyListAdapter(this, R.layout.list_item, Session.getList());
list.setAdapter(adapter);

如何为删除键做到这一点？结果
为什么notifyDataSetChanged（）方法不起作用？

How can i do this for delete button ?
Why notifyDataSetChanged() method doesn't work ?

推荐答案

我解决它重新每次适配器。结果
不好的解决方案，但它是唯一我找到了。

I solve it to recreate everytime the adapter.
Not good solution but it's the only I've found.

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