Question

我试图从MainActivity中调用片段中的适配器上的notifyDataSetChanged()，以便在更改数据后刷新视图/列表。我在OnActivityCreate()内创建了适配器，因此我无法找到如何获取适配器，因此我可以创建一个调用方法adapter.notifyDataSetChanged()

片段

@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中创建一个方法并将adapter传递给它，但我无法从主活动中调用它。另外getListAdapter()也不允许我致电notifyDataSetChanged()。这里很困惑，谢谢！

Answer 1

让它对整个活动都可见。

... 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();
    }
}

从OnActivityCreate（）获取适配器

1 个答案: