单击菜单更新 ListFragment 中的内容

Question

我有一个包含一些数据的 ListFragment。我正在尝试根据我从菜单中选择 select 的项目对列表的内容进行排序。当我从菜单中 select 一个选项时，如何更新列表的内容？我不想创建另一个片段，我只想按名称或日期对列表中的信息进行排序，因此当我单击菜单中的一个项目时，列表会立即更新，具体取决于我是否单击按名称排序或按日期排序。

public class MainActivity extends AppCompatActivity{

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main_menu, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_sort_by_name) {
        Fragment currentFragment =        this.getFragmentManager().findFragmentById(R.id.fragment1);
        ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.array.Months, android.R.layout.simple_list_item_1);
        setListAdapter(adapter);
    }
    return super.onOptionsItemSelected(item);
}

然后我有 java class 片段：

public class EventsListFragment extends ListFragment implements     OnItemClickListener {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.list_fragment, container, false);
    return view;
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    ArrayAdapter adapter = ArrayAdapter.createFromResource(getActivity(), R.array.Planets, android.R.layout.simple_list_item_1);
    setListAdapter(adapter);
    getListView().setOnItemClickListener(this);
}

@Override
public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
    Toast.makeText(getActivity(), "Item: " + position, Toast.LENGTH_SHORT).show();
}

Answer 1

对数组或自定义适配器使用排序（按比较器）或过滤器 - 取决于适配器对象的复杂性

一些示例和参考资料：

Sort listview with array adapter
sorting and filtering ListView with custom array adapter with two TextView?
Android filter and sort ListView with adapter set during Async task
How to sort adapter (BaseAdapter) based on current its field
Filtering ListView with custom (object) adapter
Custom Listview Adapter with filter Android
How could i filter the listview using baseadapter

数组适配器的基本示例：

Adapter.sort(new Comparator<Item>() {
    @Override
    public int compare(Item lhs, Item rhs) {
        return lhs.compareTo(rhs);   //Your sorting algorithm
    }
});

*项目 - class 适配器项目的定义

数组适配器文档参考：

https://developer.android.com/reference/android/widget/ArrayAdapter.html

您案例的完整解决方案：

http://www.worldbestlearningcenter.com/tips/Android-sort-ListView.htm

单击菜单更新 ListFragment 中的内容

Update content in ListFragment on menu click

android

android-listfragment