Question

我想添加一个过滤ListView的搜索功能并仅显示结果，因此我添加了EditText并添加了TextWatcher并编写了此代码{{1但它不起作用它说“无法解析getFilter方法”我确实得到了这样的事实：我的BaseAdapter中没有MainActivity.this.adapter.getFilter().filter(cs);方法，但我不知道该怎么做或我是什么应该写，我看了几个教程，但我不能使用我的代码。 P.S：getFilter项目是从互联网收集的，它们未保存在应用程序代码中

这是MainActivity：

ListView

这是我的适配器：

public class MainActivity extends Activity {

private static final String TAG = MainActivity.class.getSimpleName();
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private InterstitialAd interstitial;

// Navigation drawer title
private CharSequence mDrawerTitle;
private CharSequence mTitle;
private List<Category> albumsList;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
private LinearLayout DrawerLinear;

@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Log.d("Test", "OnCreate Called");

    mTitle = mDrawerTitle = getTitle();

    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
    DrawerLinear = (LinearLayout) findViewById(R.id.DrawerLinear);

    navDrawerItems = new ArrayList<NavDrawerItem>();

    // Getting the albums from shared preferences
    albumsList = AppController.getInstance().getPrefManger().getCategories();

    // Insert "Recently Added" in navigation drawer first position
    Category recentAlbum = new Category(null,
            getString(R.string.nav_drawer_recently_added));

    albumsList.add(0, recentAlbum);

    // Loop through albums in add them to navigation drawer adapter
    for (Category a : albumsList) {
        navDrawerItems.add(new NavDrawerItem(a.getId(), a.getTitle()));
    }

    mDrawerList.setOnItemClickListener(new SlideMenuClickListener());

    // Setting the nav drawer list adapter
    adapter = new NavDrawerListAdapter(getApplicationContext(),
            navDrawerItems);
    mDrawerList.setAdapter(adapter);

    // Enabling action bar app icon and behaving it as toggle button
    getActionBar().setDisplayHomeAsUpEnabled(true);
    getActionBar().setHomeButtonEnabled(true);
    getActionBar().setIcon(
            new ColorDrawable(getResources().getColor(
                    android.R.color.transparent)));

    mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
            R.drawable.ic_drawer, R.string.app_name, R.string.app_name) {
        public void onDrawerClosed(View view) {
            getActionBar().setTitle(mTitle);
            // calling onPrepareOptionsMenu() to show action bar icons
            invalidateOptionsMenu();
        }

        public void onDrawerOpened(View drawerView) {
            getActionBar().setTitle(mDrawerTitle);
            // calling onPrepareOptionsMenu() to hide action bar icons
            invalidateOptionsMenu();
        }
    };
    mDrawerLayout.setDrawerListener(mDrawerToggle);

    if (savedInstanceState == null) {
        // on first time display view for first nav item
        displayView(0);
    }

    final EditText inputSearch = (EditText) findViewById(R.id.inputSearch);

    inputSearch.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
            // TODO Auto-generated method stub
            //You should use the adapter in NavigationDrawerFragment
            MainActivity.this.adapter.getFilter().filter(cs); // Doesn't work, gives an error "Cannot resolve getFilter method"

        }

        @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

        }
    });

}

Answer 1

您应该在自定义适配器中实现Filterable接口。它不是由BaseAdapter实现的。

编辑：这是一个更完整的例子：

public class FiltarableAdapter extends BaseAdapter implements Filterable {

    // keep the full data here. This is needed to not loose it while filtering
    private List<SomeObject> originalData;
    // keep the data you want to show to the user here
    private List<SomeObject> data;

    // skip adapter methods 

    // we will use an instance of this to perform the filtering
    private class AdapterFilter implements Filter {

        FilterResults performFiltering(CharSequence constraint) {
            // use the constraint to filter your data in this method and create a list containing the result
            List<SomeObject> filteredData = ...
            FilterResults result = new FilterResults();
            result.count = filteredData.size();
            result.object = filteredData;
        }

        void publishResults(CharSequence constraint, Filter.FilterResults results) {
            // here you get the search results and you should use them to update your UI
            // for brevity of the example, we just replace the current adapter data with the result object
            FilterableAdapter.this.data = results.object;
            FilterableAdapter.this.notifyDataSetChanged();
        }
    }

    public Filter getFilter() {
        return new AdapterFilter();
    }
}

基本上，您在适配器内部定义过滤器，并将新实例返回到调用getFilter()的客户端。在过滤器本身中，您需要在数据中进行搜索，并在获得结果时将结果数据集与当前数据集交换。您还需要保留原始的未过滤数据集，这样您就可以在清除过滤器后快速恢复列表。

希望这有帮助。

如何为列表视图添加搜索栏？

1 个答案: