在菜單上點擊ListFragment更新內容

Question

我有一個帶有一些數據的ListFragment。我試圖根據我從菜單中選擇的項目對列表中的內容進行排序。當我從菜單中選擇一個選項時，如何更新列表的內容？我不想創建另一個片段，我只是想按名稱或日期對列表中的信息進行排序，所以當我單擊菜單中的一個項目時，列表會立即更新，具體取決於我是單擊按名稱排序還是單擊按日期排序。

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); 
} 

然後我對片段的Java類：

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（通過比較器）或通過過濾器上的陣列或定製適配器 - 取決於適配器對象的複雜性

一些實例和參考：

• 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

爲陣列適配器

基本例如：

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

*項目 - 類定義適配器項目

陣列適配器參考文件：

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

您的情況下完整的解決方案：

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