android - 带有搜索 View 的操作栏。反向兼容问题

Question

我正在构建一个示例应用程序来演示带有过滤器和其他操作栏项目的 SearchView。我能够在 4.2(Nexus 7) 上成功运行这个应用程序。但它没有在 2.3 上运行。我用谷歌搜索了这个问题。开始知道我应该使用 SherLock Action 栏。我刚刚去了http://actionbarsherlock.com/download.html ，下载 zip 文件并按照视频中的说明添加库:http://www.youtube.com/watch?v=4GJ6yY1lNNY&feature=player_embedde由 WiseManDesigns 设计。但我仍然无法弄清楚问题所在。

这是我的代码:

SearchViewActionBar.java

public class SearchViewActionBar extends Activity implements SearchView.OnQueryTextListener 
{
    private SearchView mSearchView;
    private TextView mStatusView;
    int mSortMode = -1;
    private ListView mListView;
    private ArrayAdapter<String> mAdapter;

    protected CharSequence[] _options = { "Wild Life", "River", "Hill Station", "Temple", "Bird Sanctuary", "Hill", "Amusement Park"};
    protected boolean[] _selections =  new boolean[ _options.length ];


    private final String[] mStrings = Cheeses.sCheeseStrings;

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

        setContentView(R.layout.activity_main);

       // mStatusView = (TextView) findViewById(R.id.status_text);
       // 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(true);
        mSearchView.setOnQueryTextListener(this);
        mSearchView.setSubmitButtonEnabled(false);
        //mSearchView.setQueryHint(getString(R.string.cheese_hunt_hint));
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);

        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.searchview_in_menu, menu);
        MenuItem searchItem = menu.findItem(R.id.action_search);
        mSearchView = (SearchView) searchItem.getActionView();
       //setupSearchView(searchItem);
       setupSearchView();

        return true;
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) 
    {
        if (mSortMode != -1) 
        {
            Drawable icon = menu.findItem(mSortMode).getIcon();
            menu.findItem(R.id.action_sort).setIcon(icon);
        }
        return super.onPrepareOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        String c="Category";
        String s=(String) item.getTitle();
        if(s.equals(c))
        {
            System.out.println("same");
            showDialog( 0 );
        }
        //System.out.println(s);
        Toast.makeText(this, "Selected Item: " + item.getTitle(), Toast.LENGTH_SHORT).show();
        return true;
    }

    protected Dialog onCreateDialog( int id ) 
    {
        return 
        new AlertDialog.Builder( this )
            .setTitle( "Category" )
            .setMultiChoiceItems( _options, _selections, new DialogSelectionClickHandler() )
            .setPositiveButton( "SAVE", new DialogButtonClickHandler() )
            .create();
    }


    public class DialogSelectionClickHandler implements DialogInterface.OnMultiChoiceClickListener
    {
        public void onClick( DialogInterface dialog, int clicked, boolean selected )
        {
            Log.i( "ME", _options[ clicked ] + " selected: " + selected );
        }
    }


    public class DialogButtonClickHandler implements DialogInterface.OnClickListener
    {
        public void onClick( DialogInterface dialog, int clicked )
        {
            switch( clicked )
            {
                case DialogInterface.BUTTON_POSITIVE:
                    printSelectedPlanets();
                    break;
            }
        }
    }

    protected void printSelectedPlanets()
    {
        for( int i = 0; i < _options.length; i++ ){
            Log.i( "ME", _options[ i ] + " selected: " + _selections[i] );
        }
    }

    public void onSort(MenuItem item) 
    {
        mSortMode = item.getItemId();
        invalidateOptionsMenu();
    }


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

    public boolean onQueryTextSubmit(String query) 
    {
        mStatusView.setText("Query = " + query + " : submitted");
        return false;
    }

    public boolean onClose() 
    {
        mStatusView.setText("Closed!");
        return false;
    }

    protected boolean isAlwaysExpanded() 
    {
        return false;
    }
}

Answer 1

您需要使用 ActionBarSherlock。为此，您的 Activity 需要扩展 ActionBarSherlock 组件。更像这样:

MySearchActivity 扩展 SherlockActivity {}

或者如果您想使用内置列表 API，您可以这样做:

MySearchActivity 扩展 SherlockListActivity {}

然后在 res/menu 文件夹中创建 activity_mysearch.xml 文件，其中包含如下内容:

<menu xmlns:android="http://schemas.android.com/apk/res/android" >    
    <item 
        android:id="@+id/menu_search"
        android:icon="@drawable/ic_menu_search"
        android:title="@string/menu_search"
        android:showAsAction="ifRoom|collapseActionView"
        android:actionViewClass="com.actionbarsherlock.widget.SearchView"
</menu>

现在让您的 Activity 实现 OnQueryTextListener。在 onCreateOptionsMenu 中执行:

inflater.inflate(R.menu.activity_mysearch, menu);
MenuItem searchViewMenuItem = menu.findItem(R.id.menu_search);
SearchView searchView = (SearchView) searchViewMenuItem.getActionView();
searchView.setOnQueryTextListener(this);

您现在可以使用

onQueryTextSubmit(String query)
onQueryTextChange(String newText)

查询列表和更新 ListView 项的方法。您还可以向适配器添加过滤器，并创建一个接口(interface)，在适配器的数据集发生更改后通知 Activity 使 ListView 无效。