java - 从 OnActivityCreate() 获取适配器

Question

我正在尝试调用notifyDataSetChanged()从 MainActivity 中的 Fragment 中的适配器上，以便在更改数据后刷新 View /列表。我在 OnActivityCreate() 内创建适配器，所以我无法找到如何获取适配器，以便我可以创建一个调用方法，该方法将具有 adapter.notifyDataSetChanged()

fragment

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    String[] names = new String[] { "name1", "name1", "name1" };
    String[] values = new String[] { "value1", "value2", "value3" };
    MyArrayAdapter adapter = new MyArrayAdapter(getActivity(), names, values);
    setListAdapter(adapter);
}

我尝试在 Fragment 中创建一个方法并传递 adapter但我无法从主要 Activity 中调用它。另外getListAdapter()不让我打电话notifyDataSetChanged() 。这里很困惑，谢谢!

Answer 1

只需使其对整个 Activity 可见即可。

... MyClass {

    private MyArrayAdapter adapter;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        String[] names = new String[] { "name1", "name1", "name1" };
        String[] values = new String[] { "value1", "value2", "value3" };
        adapter = new MyArrayAdapter(getActivity(), names, values);
       setListAdapter(adapter);
    }

    // Another method
    private void myMethod() {
          adapter.notifyDataSetChanged();
    }
}