BaseAdapter Listview过滤Android

Posted 2023-04-18

【中文标题】BaseAdapter Listview过滤Android

【英文标题】：BaseAdapter Listview Filtering Android

【发布时间】：2011-10-17 14:22:34

【问题描述】：

在我的Listview 中，我有文本和图像，它们存储在ArrayList。

我正在使用BaseAdapter 来显示列表。

我想根据在EditText 中键入的文本在列表中使用filter，但不起作用。

我的代码是：adv is EditText

  adv.addTextChangedListener(new TextWatcher() 

            @Override
            public void onTextChanged(CharSequence s, int arg1, int arg2, int arg3) 
                // TODO Auto-generated method stub
                viewadapter.getFilter().filter(s);

            

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

            

            @Override
            public void afterTextChanged(Editable arg0) 
                // TODO Auto-generated method stub

            
        );

而我的BaseAdapter 实现了Filterable 所以getFilter 方法是：

@Override
        public Filter getFilter() 
            // TODO Auto-generated method stub
             if (mFilter == null) 
                    mFilter = new ArrayFilter();
                
                return mFilter;
        

而我的ArrayFilter 是：

 private class ArrayFilter extends Filter 
        @Override
        protected FilterResults performFiltering(CharSequence prefix) 
            FilterResults results = new FilterResults();

            if (mNames == null) 
                synchronized (mLock) 
                    mNames = new ArrayList<String>(mObjects);
                
            

            if (prefix == null || prefix.length() == 0) 
                synchronized (mLock) 
                    ArrayList<String> list = new ArrayList<String>(mNames);
                    results.values = list;
                    results.count = list.size();
                
             else 
                String prefixString = prefix.toString().toLowerCase();

                final ArrayList<String> values = mNames;
                final int count = values.size();

                final ArrayList<String> newValues = new ArrayList<String>(count);

                for (int i = 0; i < count; i++) 
                    final String value = values.get(i);
                    final String valueText = value.toString().toLowerCase();

                    // First match against the whole, non-splitted value
                    if (valueText.startsWith(prefixString)) 
                        newValues.add(value);
                     else 
                        final String[] words = valueText.split(" ");
                        final int wordCount = words.length;

                        for (int k = 0; k < wordCount; k++) 
                            if (words[k].startsWith(prefixString)) 
                                newValues.add(value);
                                break;
                            
                        
                    
                

                results.values = newValues;
                results.count = newValues.size();
            

            return results;
        

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) 
            //noinspection unchecked
            mObjects = (List<String>) results.values;
            if (results.count > 0) 
                viewadapter.notifyDataSetChanged();
             else 
                viewadapter.notifyDataSetInvalidated();
            

    

因为mNames 是ArrayList，我想用它过滤ListView。

还启用了setTextFilterEnabled(true).，但过滤不起作用。

这是正确的方法吗？有什么问题？如果没有，该怎么做？

【问题讨论】：

您解决了这个问题吗？您能给我们反馈吗？

不，我没有得到解决，那就是我保持打开状态！如果你有，请在这里发帖谢谢

如何在 ArrayList???

中保存文本和图像

我希望这个例子可以帮助到你 [如何使用 getfilter 和 baseadapter 的例子][1] [1]: ***.com/questions/12456525/…

【参考方案1】：

这是 API 演示示例

public class SearchViewFilterMode extends Activity implements SearchView.OnQueryTextListener 

    private static final String TAG = "SearchViewFilterMode";

    private SearchView mSearchView;
    private ListView mListView;
    private ArrayAdapter<String> mAdapter;

    private final String[] mStrings = Cheeses.sCheeseStrings;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        getWindow().requestFeature(Window.FEATURE_ACTION_BAR);

        setContentView(R.layout.searchview_filter);

        mSearchView = (SearchView) findViewById(R.id.search_view);
        mListView = (ListView) findViewById(R.id.list_view);
        mListView.setAdapter(mAdapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1,
                mStrings));
        mListView.setTextFilterEnabled(true);
        setupSearchView();
    

    private void setupSearchView() 
        mSearchView.setIconifiedByDefault(false);
        mSearchView.setOnQueryTextListener(this);
        mSearchView.setSubmitButtonEnabled(false);
        mSearchView.setQueryHint(getString(R.string.cheese_hunt_hint));
    

    public boolean onQueryTextChange(String newText) 
        if (TextUtils.isEmpty(newText)) 
            mListView.clearTextFilter();
         else 
            mListView.setFilterText(newText.toString());
        
        return true;
    

    public boolean onQueryTextSubmit(String query) 
        return false;