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我有一个自定义 ListView，它通过传递 xml 数据 ArrayList 来获取 baseadapter。

我想使用 ActionbarSherlock 4.2 Searchview 执行搜索，因此在用户输入文本并按下按钮后，它将用结果填充新布局。

最好的指导方针是什么？

  • 我应该在 BaseAdapter 上实现 Filterable 吗？如果是，我如何处理从 Sherlock Searchview 获取 tostring() 而不是 filterText.addTextChangedListener(filterTextWatcher);？
  • 我应该创建一个新的 BaseAdapter 以仅通过搜索下载列表视图提示吗？如果是，您是否有任何示例或教程要链接？
  • 还是其他方式？

自定义列表视图：

public class CustomizedListView extends ListFragment {
    // All static variables
    static final String URL = "http://api.androidhive.info/music/music.xml";
    // XML node keys
    static final String KEY_SONG = "song"; // parent node
    static final String KEY_ID = "id";
    static final String KEY_TITLE = "title";
    static final String KEY_ARTIST = "artist";
    static final String KEY_DURATION = "duration";
    static final String KEY_THUMB_URL = "thumb_url";

    ListView list;
    LazyAdapter adapter;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onActivityCreated(savedInstanceState);


        ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();

        XMLParser parser = new XMLParser();
        String xml = parser.getXmlFromUrl(URL); // getting XML from URL
        Document doc = parser.getDomElement(xml); // getting DOM element

        NodeList nl = doc.getElementsByTagName(KEY_SONG);
        // looping through all song nodes <song>
        for (int i = 0; i < nl.getLength(); i++) {
            // creating new HashMap
            HashMap<String, String> map = new HashMap<String, String>();
            Element e = (Element) nl.item(i);
            // adding each child node to HashMap key => value
            map.put(KEY_ID, parser.getValue(e, KEY_ID));
            map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE));
            map.put(KEY_ARTIST, parser.getValue(e, KEY_ARTIST));
            map.put(KEY_DURATION, parser.getValue(e, KEY_DURATION));
            map.put(KEY_THUMB_URL, parser.getValue(e, KEY_THUMB_URL));

            // adding HashList to ArrayList
            songsList.add(map);
        }



        // Getting adapter by passing xml data ArrayList
        adapter = new LazyAdapter(getActivity(), songsList);        
        setListAdapter(adapter);



    }   
}

基础适配器：

public class LazyAdapter extends BaseAdapter {

    private FragmentActivity activity;
    private ArrayList<HashMap<String, String>> data;
    private static LayoutInflater inflater=null;
    public ImageLoader imageLoader; 


    public LazyAdapter(FragmentActivity fragmentActivity, ArrayList<HashMap<String, String>> d) {
        activity = fragmentActivity;
        data=d;
        inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        imageLoader=new ImageLoader(activity.getApplicationContext());
    }

    public int getCount() {
        return data.size();
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        View vi=convertView;
        if(convertView==null)

            vi = inflater.inflate(R.layout.list_row, null);

        TextView title = (TextView)vi.findViewById(R.id.title); // title
        TextView artist = (TextView)vi.findViewById(R.id.artist); // artist name
        TextView duration = (TextView)vi.findViewById(R.id.duration); // duration
        ImageView thumb_image=(ImageView)vi.findViewById(R.id.list_image); // thumb image

        HashMap<String, String> song = new HashMap<String, String>();
        song = data.get(position);

        // Setting all values in listview
        title.setText(song.get(CustomizedListView.KEY_TITLE));
        artist.setText(song.get(CustomizedListView.KEY_ARTIST));
        duration.setText(song.get(CustomizedListView.KEY_DURATION));
        imageLoader.DisplayImage(song.get(CustomizedListView.KEY_THUMB_URL), thumb_image);
        return vi;
    }
}

Sherlock ActionBar 搜索视图：

public abstract class BaseSampleActivity extends SherlockFragmentActivity {
    private static final Random RANDOM = new Random();

    TestFragmentAdapter mAdapter;
    ViewPager mPager;
    PageIndicator mIndicator;

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
         SearchView searchView = new SearchView(getSupportActionBar().getThemedContext());
        searchView.setQueryHint("Procure pelo nome");
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {

        @Override
        public boolean onQueryTextSubmit(String query) {
            // TODO Auto-generated method stub
            Intent search = new Intent(getApplicationContext(), SearchableActivity.class);
            search.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            search.putExtra(query, query);
            startActivityForResult(search, 0);
            return true;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            // TODO Auto-generated method stub
            return false;
        }
    });

        menu.add("Search")
            .setIcon(R.drawable.ic_search_inverse)
            .setActionView(searchView)
            .setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW);
        return true;
    }

新活动：

public class SearchableActivity extends SherlockListActivity{

    // All static variables
        static final String URL = "http://api.androidhive.info/music/music.xml";
        // XML node keys
        static final String KEY_SONG = "song"; // parent node
        static final String KEY_ID = "id";
        static final String KEY_TITLE = "title";
        static final String KEY_ARTIST = "artist";
        static final String KEY_DURATION = "duration";
        static final String KEY_THUMB_URL = "thumb_url";

    private String message;
    private ListView list;
    private LazyAdapterS adapter;

    protected void onCreate(Bundle savedInstanceState, String query) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        message = getIntent().getExtras().getString(query);
        setContentView(R.layout.main_list_row);


        ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();

        XMLParser parser = new XMLParser();
        String xml = parser.getXmlFromUrl(URL); // getting XML from URL
        Document doc = parser.getDomElement(xml); // getting DOM element

        NodeList nl = doc.getElementsByTagName(KEY_SONG);
        // looping through all song nodes <song>
        for (int i = 0; i < nl.getLength(); i++) {
            // creating new HashMap
            HashMap<String, String> map = new HashMap<String, String>();
            Element e = (Element) nl.item(i);
            // adding each child node to HashMap key => value
            map.put(KEY_ID, parser.getValue(e, KEY_ID));
            map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE));
            map.put(KEY_ARTIST, parser.getValue(e, KEY_ARTIST));
            map.put(KEY_DURATION, parser.getValue(e, KEY_DURATION));
            map.put(KEY_THUMB_URL, parser.getValue(e, KEY_THUMB_URL));

            // adding HashList to ArrayList
            songsList.add(map);
        }


        list=(ListView)findViewById(R.id.list);

        // Getting adapter by passing xml data ArrayList
        adapter = new LazyAdapterS(this, songsList);        
        list.setAdapter(adapter);
        ((Filterable) list.getAdapter()).Filter(message);// Error The method Filter(String) is undefined for the type Filterable
    }

}

更新：我按照@Luksprog 的建议放置了 setOnQueryTextListener。更新：我创建了一个新活动来显示搜索结果，但过滤器仍然出错，我不知道如何处理。

谢谢，

4

1 回答 1

0

我应该在 BaseAdapter 上实现 Filterable 吗？

如果您想对适配器使用标准过滤机制（任何 Android SDK 适配器都会这样做），是的，您需要实现Filterable接口并为其两种方法提供适当的实现。

如果是，我如何处理从 Sherlock Searchview 获取 tostring() 而不是 filterText.addTextChangedListener(filterTextWatcher);？

看看OnQueryTextListener：

public boolean onQueryTextSubmit(String query) {
      ((Filterable) listview.getAdapter()).filter(query);
      return true;
}

我应该创建一个新的 BaseAdapter 以仅通过搜索下载列表视图提示吗？如果是，您是否有任何示例或教程要链接？

如果您的意思是，再次解析 xml（仅使用与查询字符串匹配的内容）并创建一个新适配器以显示结果，不，因为您将做很多不必要的工作（尤其是您应该真正尝试的所有网络调用在后台线程上移动）。

如果您想在新活动中显示结果，则将查询String放入Intent启动结果活动并在那里执行/重做过滤。

还是其他方式？

见第一点。

于 2012-12-28T14:55:39.023 回答