Question

我有两个要素：

我的活动设置的动作栏（HoloEverywhere（support.v7））中的旋转器onItemSelectedListener()。
我的Activity中的Listview，其中填充了ArrayAdapter

当我从Spinner中选择一个Item时，应该更新ListView。但不知怎的，我想我的Spinner有问题。在选择SpinnerItem后，当我在Activity的TextField中单击时，ListView首先更新。

我的代码：

// Get a databaseConnection and fills the history variable with the data of 
// the selected spinnerItem "history" is right filled with all Strings for 
// the chosen Spinner from the database -> works correct

public void updateHistory() {
    sqlLightDatabase database = new sqlLightDatabase(this);
    ArrayList<String> history = database.getArrayList(
                                    mySpinner.getSelectedItem().toString());


    // set the adapter to the ListView
    ArrayAdapter<String> listenAdapter = new ArrayAdapter<String>(this,
                                                  R.layout.list_item, history);
    myListView.setAdapter(listenAdapter);

    // the code works through, but the ListView is not shown the update 
    // instantly. But now, when I click a TextField in my Activity, myListView 
    // shows the new data
}

// Is instantly called when an Item is selected in mySpinner (in my ActionBar)

@Override
public void onItemSelected(AdapterView<?> parent, View view, int position,
                           long id) 
{
    // the updateHistory function is called but myLitstView doesn't get
    // updated with new Data

    updateHistory();

    //Just for testing. The following is working instantly fine.
    drivenDistance_TF.setText("History changed");
}

我尝试了最近两天修复此问题，但我完全不知道我还能尝试立即更新ListView。

没有ErrorLog，因为没有错误。

Answer 1

您必须调用notifyDataSetChanged方法来更新列表视图中的数据

所以写下这一行

listenAdapter.notifyDataSetChanged();

myListView.setAdapter(listenAdapter);后的

在updateHistory（）;

中

ActionBar中的微调器没有更新ListView

1 个答案: