Question

如何从ListFragment中的Activity添加项目？

public class LoadObjects extends ListFragment 
{

    String data[] = new String[] { "one", "two", "three", "four" };

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                getActivity(),
                android.R.layout.simple_list_item_1,
                data);
        setListAdapter(adapter);
    }
}

如何在此FragmentList中上传Activity的菜单项？请举例或链接。

Answer 1

将适配器保存为实例变量，以便可以从任何位置引用它。然后，您可以从活动中为其添加项目。

public class LoadObjects extends ListFragment 
{

    String data[] = new String[] { "one", "two", "three", "four" };
    public ArrayAdapter<String> mAdapter;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mAdapter = new ArrayAdapter<String>(
                getActivity(),
                android.R.layout.simple_list_item_1,
                data);
        setListAdapter(mAdapter);
    }
}

然后从您的活动更新ListFragment的ListView：

FragmentManager fManager = getFragmentManager();
LoadObjects frag = (LoadObjects) fManager.findFragmentByTag("listFragment");
if (frag != null) {
    frag.mAdapter.addAll(youNewData);
}

当然请注意，在创建LoadObjects片段时，您需要为它设置一个标记：

LoadObjects frag = new LoadObjects();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.add(R.id.fragment_container, frag, "listFragment");
transaction.commit();

如何从ListFragment中的Activity添加项？

1 个答案: