ListView 中的搜索过滤器未按预期工作

Question

我们有一个列表视图片段，其中包含一个列表视图、编辑文本（用于搜索）和复选框（全选）。如前所述，我们使用编辑文本从列表视图中搜索值。

问题：

1. 我们有显示 10 个项目的列表视图（列表视图按字母顺序排序）。
2. 当我们在编辑文本中键入“W”时，我们会显示两个值，即 WF 和 WH。
3. 选择的是 WF（显示的第一个项目）。
4. 清除编辑文本中的字符后，我们现在会显示列表视图的完整列表。
5. 但现在选择的是 AHMD 列表中的第一项。 （我们打算选择WF）

基本上，我们执行搜索后，列表视图中的数据位置不会被刷新。

代码：

 public static class ListViewFragment extends Fragment {

    private ListView myListView;
    private EditText editsearch;
    private CheckBox selectAll;
    private String SELECTED_FILTER;
    private ArrayList<String> SelectedFilter1;
    private ArrayList<String> checkekprev=new ArrayList<String>();
    private ArrayList<String> CheckedFitlers=new ArrayList<String>();

    ArrayAdapter<String> adapter_list;

    OnCheckedItemsLister onCheckedItemsLister;     

    public ListViewFragment() {
        // Empty constructor required for fragment subclasses
    }

    @Override
    public void onAttach(Activity activity) {
      super.onAttach(activity);
          try {
              onCheckedItemsLister = (OnCheckedItemsLister) activity;
          } catch (ClassCastException e) {
              throw new ClassCastException(activity.toString() + " must implement onSomeEventListener");
          }
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);  
        setRetainInstance(true);
        SelectedFilter1=getArguments().getStringArrayList("ArrayList");
        SELECTED_FILTER=getArguments().getString("SELECTED_FILTER");
        checkekprev=getArguments().getStringArrayList("checkedprevlist");




        if(checkekprev.size()==SelectedFilter1.size())
            selectAll.setChecked(true);
            else
            selectAll.setChecked(false);

        adapter_list = new ArrayAdapter<String>(this.getActivity(),
                android.R.layout.simple_list_item_multiple_choice,SelectedFilter1);

        adapter_list.notifyDataSetChanged();

        myListView.setAdapter(adapter_list);

        myListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

        myListView.setTextFilterEnabled(true);

        try{
            if(checkekprev.isEmpty()==false){
                Log.i("Adapter set", "Yes");
                for(int j=0;j<checkekprev.size();j++){
                    Log.i("Adapter set", "Yes:"+j);
                int pos=adapter_list.getPosition(checkekprev.get(j));
                Log.i("Adapter set", "Pos:"+pos);
                myListView.setItemChecked(pos,true);
                }

            }           
        }catch(NullPointerException  e){
            Log.i("Null set", "Yes");
        }

        editsearch.addTextChangedListener(new TextWatcher() {

            @Override
            public void afterTextChanged(Editable arg0) {
                // TODO Auto-generated method stub
                String text = editsearch.getText().toString().toLowerCase(Locale.getDefault());
                adapter_list.getFilter().filter(text);
            }

            @Override
            public void beforeTextChanged(CharSequence arg0, int arg1,
                    int arg2, int arg3) {
                // TODO Auto-generated method stub
            }

            @Override
            public void onTextChanged(CharSequence arg0, int arg1, int arg2,
                    int arg3) {
                // TODO Auto-generated method stub
            }
        });

        selectAll.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {

                Log.i("CheckBOX","Is Checked:"+isChecked);
                if(isChecked)
                {
                    for ( int i=0; i< myListView.getCount(); i++ ) 
                        myListView.setItemChecked(i, true);

                }else
                {
                    for ( int i=0; i< myListView.getCount(); i++ ) 
                        myListView.setItemChecked(i, false);
                }
                SparseBooleanArray checked = myListView.getCheckedItemPositions();
                CheckedFitlers.clear();
                for(int i=0;i<=checked.size();i++){
                    if (checked.get(i)){
                        CheckedFitlers.add(SelectedFilter1.get(i));
                    }
                }
                onCheckedItemsLister.someEvent(CheckedFitlers,SELECTED_FILTER);
            }
        }
     );

        myListView.setOnItemClickListener(new OnItemClickListener() { 

            public void onItemClick(AdapterView<?> parent, View view,int position, long id){
                setItemChecked(position);
                onCheckedItemsLister.someEvent(CheckedFitlers,SELECTED_FILTER); 

            }               
        });

    }

    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);

        if(savedInstanceState!=null){
            checkekprev=savedInstanceState.getStringArrayList("Checked_Values");
        }
    }

    public void setItemChecked(int position){

        //if(SelectedFilter1.get(position).)

            //int len = myListView.getCount();
            SparseBooleanArray checked = myListView.getCheckedItemPositions();

            for(int i=0;i<=checked.size();i++){
                Log.i("Check Sparse Array","Check Sparse Array: "+checked.get(i));
            }

            //for (int i = 0; i < len; i++){
                Log.i("SelectedFilter1.get(position)","SelectedFilter1.get(position):::"+SelectedFilter1.get(position));

                Log.i("checked.get(position))","checked.get(position)):::"+checked.get(position));

                for (int i=0; i<CheckedFitlers.size();i++){
                    Log.i("CheckedFitlers","CheckedFitlers:::" + CheckedFitlers.get(i));
                }
                for (int i=0; i<checkekprev.size();i++){
                    Log.i("checkekprev","checkekprev:::" + checkekprev.get(i));
                }
                Log.i("CheckedFitlers","CheckedFitlers:::" + CheckedFitlers.size());
                Log.i("checkekprev","checkekprev:::" + checkekprev.size());

                if(CheckedFitlers.size() == 0 && checkekprev.size() != 0){
                    CheckedFitlers = checkekprev;
                }

                Log.i("CheckedFitlers","CheckedFitlers:::" + CheckedFitlers.size());

                if (checked.get(position)) {
                    Log.i("Adding","Adding::"+checked.get(position));

                    CheckedFitlers.add(SelectedFilter1.get(position));
                 for(int i=0;i<checkekprev.size();i++){
                        //Log.i("Checked Filters FOr loop","Checked Filters:"+CheckedFitlers.get(i));
                    }
               }    else
               {
                Log.i("Removing","Removing::"+checked.get(position)+":"+SelectedFilter1.get(position));
                CheckedFitlers.remove(SelectedFilter1.get(position));
                    for(int i=0;i<checkekprev.size();i++){
                        //Log.i("Checked Filters for loop","Checked Filters:"+CheckedFitlers.get(i));
                    }
               }
                Log.i("CheckedFitlers","CheckedFitlers:::" + CheckedFitlers.size());

    }

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {        

        View rootView = inflater.inflate(R.layout.fragment_list_view, container, false);

        myListView=(ListView) rootView.findViewById(R.id.listView_brand);

        editsearch = (EditText) rootView.findViewById(R.id.search);

        selectAll=(CheckBox) rootView.findViewById(R.id.checkBox1);

        selectAll.setFocusable(false);

        return rootView;
    }

    public void onSaveInstanceState(Bundle savedInstanceState){
        super.onSaveInstanceState(savedInstanceState);

        Log.i("savedInstanceState in listfragment","savedInstanceState in listfragment");
        //onCheckedItemsLister.someEvent(CheckedFitlers,SELECTED_FILTER);
        onCheckedItemsLister.getSelectedFilter(SELECTED_FILTER);

    }

}

Answer 1

当您在编辑文本中键入“W”时，我们会显示两个值，即 WF 和 WH。选择是针对 WF（显示的第一个项目）。

但是您已经对列表视图的第一行执行了操作，现在列表视图的复选框已选中，并且在清除编辑文本中的字符时，您会看到列表视图的完整列表，其中第一个框已选中。这是正确的。

如果您想避免此问题，请创建自定义适配器并覆盖 getfilter 方法。

否则，创建您自己的逻辑并调用 listView.setItemChecked(stored position, true/false);在 ontextchanged 中。

Answer 2

在此示例中，假设活动标签和列表视图项具有相同的值。从WF到WZ有10个项目。 （我采样了 4 个项目） 当在编辑文本中键入“WZ”时，“WZ”项目显示在列表视图的第一行。单击第一行时，最好调用“WZ”活动，而不是“WF”活动。我为它创建了以下小代码，它运行良好。

@Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

        String v1 = getString(R.string.title_activity_wf).toString();
        String v2 = getString(R.string.title_activity_wh).toString();
        String v3 = getString(R.string.title_activity_wm).toString();
        String v4 = getString(R.string.title_activity_wt).toString();
        .
        .
        .
        .
        .
        .

        String selectedFromList = (String) (listView.getItemAtPosition(position));

        if (selectedFromList.equalsIgnoreCase(v1)) {
            startActivity(new Intent(getApplicationContext(), Wf.class));
        } else if (selectedFromList.equalsIgnoreCase(v2)) {
            startActivity(new Intent(getApplicationContext(), Wh.class));
        } else if (selectedFromList.equalsIgnoreCase(v3)) {
            startActivity(new Intent(getApplicationContext(), Wm.class));
        } else if (selectedFromList.equalsIgnoreCase(v4)) {
            startActivity(new Intent(getApplicationContext(), Wt.class));

    }
});