搜索在操作栏中的片段

Question

我正在创建一个android应用程序。在应用程序中，我有一个登录页面。登录后显示用户列表。用户列表活动是HomeActivity.java，其中包含两个片段，分别命名为UserListFragment.java和ChatFragment.java用户列表正在从firebase获取。

UserListFragment.java包含一个具有搜索菜单和注销菜单的操作栏。注销菜单工作正常，但搜索不起作用。搜索图标会显示，但是当我搜索某些内容时，它不会显示任何内容，即没有过滤器。我正在使用firebase来显示用户列表。

我不想显示在ChatFragment.java

的搜索查看我尝试了各种不同的各种解决方案。但没有人为我工作。

这是代码。

UserListFragment.java

public class UsersListFragment extends Fragment { 
// TODO: Rename parameter arguments, choose names that match 
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER 
private static final String ARG_PARAM1 = "param1"; 
private static final String ARG_PARAM2 = "param2"; 
Activity activity; 
// TODO: Rename and change types of parameters 
private String mParam1; 
private String mParam2; 
private static final String TAG = "UsersListFragment"; 
private OnFragmentInteractionListener mListener; 
private ListView listView; 
private List<UserData> users; 
private CustomAdapter adapter; 
SharedPreferences.Editor preferenceEditor; 
Timer myTimer; 
View view; 
ActionBar actionBar; 
private static final String PREFRENCES_NAME = "setPreferences"; 
private ProgressDialog progressBar; 
String partnerKeyValue; 

// TODO: Rename and change types and number of parameters 
public static UsersListFragment newInstance(String param1, String param2) { 
    UsersListFragment fragment = new UsersListFragment(); 
    Bundle args = new Bundle(); 
    args.putString(ARG_PARAM1, param1); 
    args.putString(ARG_PARAM2, param2); 
    fragment.setArguments(args); 
    return fragment; 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    Global.getInstance().unreadMessageUsers.clear(); 
    progressBar = new ProgressDialog(getActivity()); 
    progressBar.setCancelable(false); 
    progressBar.setMessage("Loading..."); 
    progressBar.setProgressStyle(ProgressDialog.STYLE_SPINNER); 
    progressBar.setProgress(0); 
    } 

@Override 
public void onCreateOptionsMenu(Menu menu,MenuInflater inflater) { 

    inflater.inflate(R.menu.menu_userlist,menu); 
    MenuItem item = menu.findItem(R.id.menuSearch); 

    SearchView searchView = (SearchView)item.getActionView(); 

    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() { 
     @Override 
     public boolean onQueryTextSubmit(String query) { 
      return false; 
     } 

     @Override 
     public boolean onQueryTextChange(String newText) { 
      Log.i(TAG,newText); 
      adapter.getFilter().filter(newText); 
      return true; 
     } 
    }); 

    super.onCreateOptionsMenu(menu,inflater); 
} 


private void logoutUser(){ 
    Intent I = new Intent(getActivity(), LoginActivity.class); 
    startActivity(I); 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 

    switch (item.getItemId()) { 
     case R.id.menuSearch : 
      return true; 

     case R.id.menuLogout : 
      logoutUser(); 
      return true; 

     default: 
      return super.onOptionsItemSelected(item); 
    } 

} 

menu_userlist.xml

<?xml version="1.0" encoding="utf-8"?> 
<menu xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto"> 

<item android:id="@+id/menuSearch" 
    android:title="@string/search" 
    android:icon="@drawable/ic_search" 
    app:actionViewClass="android.widget.SearchView" 
    app:showAsAction="always"> 
</item> 

<item android:id="@+id/menuLogout" 
    android:title="@string/logout" 
    android:icon="@drawable/ic_logout" 
    app:showAsAction="always"> 
</item> 

CustomAdapter.java

@Override 
public Filter getFilter() { 
    Filter filter = new Filter() { 

     @SuppressWarnings("unchecked") 
     @Override 
     protected void publishResults(CharSequence constraint,FilterResults results) { 

      users = (List<UserData>) results.values; // has the filtered values 
      notifyDataSetChanged(); // notifies the data with new filtered values 
     } 

     @Override 
     protected FilterResults performFiltering(CharSequence constraint) { 
      FilterResults results = new Filter.FilterResults();  

      List<String> FilteredArrList = new ArrayList<String>(); 

       if (mOriginalValues != null) { 

       if (constraint == null || constraint.length() == 0) { 

        // set the Original result to return 
        results.count = mOriginalValues.size(); 
        results.values = mOriginalValues; 
       } else { 
        constraint = constraint.toString().toLowerCase(); 
        for (int i = 0; i < mOriginalValues.size(); i++) { 
         String data = mOriginalValues.get(i).toString(); 
         if (data.toLowerCase().contains(constraint.toString())) { 
          FilteredArrList.add(data); 
         } 
        } 
        // set the Filtered result to return 
        results.count = FilteredArrList.size(); 
        results.values = FilteredArrList; 
       } 
      } 

      return results; 
     } 
    }; 
    return filter; 
} 
} 

Answer 1

我自己解决了我的问题。它可能会帮助别人。 :)

CustomAdapter.java

@Override 
public Filter getFilter() { 
    Filter filter = new Filter() { 

     @SuppressWarnings("unchecked") 
     @Override 
     protected void publishResults(CharSequence constraint, 
             FilterResults results) { 
      clear(); 
      addAll((List<UserData>) results.values); 
      arrayList = (List<UserData>)results.values; 
      notifyDataSetChanged(); 
     } 


     @Override 
     protected FilterResults performFiltering(CharSequence constraint) { 
      FilterResults results = new FilterResults();  // Holds the results of a filtering operation in values 
      List<UserData> FilteredArrList = new ArrayList<UserData>(); 

      if (mOriginalValues == null) { 
       mOriginalValues = new ArrayList<UserData>(arrayList); 
      } 


      if (constraint == null || constraint.length() == 0) { 
       results.count = mOriginalValues.size(); 
       results.values = mOriginalValues; 
      } else { 
       constraint = constraint.toString().toLowerCase(); 


       for (int i = 0; i < mOriginalValues.size(); i++) { 
        String data = mOriginalValues.get(i).getName(); 

        if (data.toLowerCase().contains(constraint.toString())) { 
         FilteredArrList.add(mOriginalValues.get(i)); 
        } 
       } 
       // set the Filtered result to return 
       results.count = FilteredArrList.size(); 
       results.values = FilteredArrList; 
      } 

      return results; 
     } 

    }; 
    return filter; 
} 

Answer 2

更改下面的代码段 -

@SuppressWarnings("unchecked") 
    @Override 
    protected void publishResults(CharSequence constraint,FilterResults results) { 
     clear(); 
     addAll((List<UserData>) results.values) 
     users = (List<UserData>) results.values; // has the filtered values 

     notifyDataSetChanged(); // notifies the data with new filtered values 
    } 

这主要可以解决这个问题。但源代码中存在很多不一致之处。您正在扩展ArrayAdpater，它已经实现了Filterable接口。

此外，还查看为什么你需要下面的状态变量 -

private List<UserData> messages; 
private List<UserData> users; 
private List<UserData> mOriginalValues; 

请注意，您正在扩展ArrayAdapter和要传递的初始数据在构造函数中设置。之后在数据集中发生任何变化，您需要将其重置为父母ArrayAdapter。只是改变你的子类中的状态变量，是不会有帮助的。