单击菜单时更新 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的项目对列表的内容进行排序。当我从菜单中选择一个选项时，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，具体取决于我单击按名称排序还是按日期排序。

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);
}

然后我有了片段的 java 类：

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

使用排序（通过比较器）或通过数组或自定义适配器上的过滤器 - 取决于适配器对象的复杂性

一些例子和参考：

• 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
    }
});

*Item - 适配器项的类定义

阵列适配器文档参考：

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

为您的案例提供完整的解决方案：

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