Acho que consegui: você pode realmente usar fragmentos e adicionar um ícone de pesquisa a uma barra de ação, para que seja possível uma pesquisa dentro dos fragmentos. O truque é usar uma barra de ação, uma exibição de ação, um ouvinte, um carregador e um adaptador, é claro.
Isso funciona muito bem, embora ignore completamente o mecanismo de pesquisa da plataforma Android (mas pode ser concluído com algum trabalho para encontrar o que @Alex Lockwood descreve e passar a pesquisa para fragmentos). Não reagiria a uma intenção conforme o esperado no caso de uma atividade, mas funciona: os usuários podem pesquisar dentro de fragmentos.
Aqui está o código:
SearchInFragmentActivity
package com.sof.test.searchfragment;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.ActionBar.Tab;
import com.actionbarsherlock.app.ActionBar.TabListener;
import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.sof.test.searchfragment.SearchFragment;
import com.sof.test.R;
public class SearchInFragmentActivity extends SherlockFragmentActivity implements TabListener {
private SearchFragment tab1 = new SearchFragment();
private SearchFragment tab2 = new SearchFragment();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView( R.layout.search_in_fragments );
getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
createTab( R.string.tab1, R.drawable.ic_menu_search );
createTab( R.string.tab2, R.drawable.ic_menu_search );
getSupportActionBar().setSelectedNavigationItem( 0 );
invalidateOptionsMenu();
}
private void createTab(int tabNameResId, int tabIconResId) {
ActionBar.Tab tab = getSupportActionBar().newTab();
tab.setText( tabNameResId );
tab.setTabListener(this);
getSupportActionBar().addTab(tab);
}// met
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
if( ft == null ) {
return;
}//if
View fragmentSlot = findViewById( R.id.fragment );
Fragment newFragment = null;
if( fragmentSlot != null ) {
newFragment = (tab.getPosition() == 0) ? tab1 : tab2;
ft.replace(R.id.fragment, newFragment );
ft.setTransition( FragmentTransaction.TRANSIT_FRAGMENT_FADE);
}//if
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
}//class
A classe de fragmento SearchFragment (eu uso 2 instâncias dentro da atividade acima).
package com.sof.test.searchfragment;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.AsyncTaskLoader;
import android.support.v4.content.Loader;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.SearchView;
import android.widget.TextView;
import com.sof.test.R;
import com.actionbarsherlock.app.SherlockListFragment;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuInflater;
public class SearchFragment extends SherlockListFragment {
private StringLoader loader = null;
private StringAdapter adapter = null;
private List<String> listData = new ArrayList<String>();
private String query;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = super.onCreateView(inflater, container, savedInstanceState);
createListData();
loader = new StringLoader( getActivity(), this );
adapter = new StringAdapter(listData);
setListAdapter(adapter);
getLoaderManager().initLoader(0, null, new LoaderCallBacks() );
loader.forceLoad();
setHasOptionsMenu( true );
return view;
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater ) {
super.onCreateOptionsMenu(menu, inflater);
inflater.inflate( R.menu.menu_search, menu);
System.out.println( "inflating menu");
final SearchView searchView = (SearchView) menu.findItem(R.id.menu_search).getActionView();
final SearchView.OnQueryTextListener queryTextListener = new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextChange(String newText) {
showFilteredItems( newText );
return true;
}
@Override
public boolean onQueryTextSubmit(String query) {
return true;
}
};
searchView.setOnQueryTextListener(queryTextListener);
return;
}//met
private void showFilteredItems( String query ) {
this.query = query;
loader.onContentChanged();
}
private void createListData() {
for( int i = 0; i < 100 ; i ++ ) {
listData.add( "String "+ i );
}
}
public List<String> getData() {
List<String> listFilteredData = new ArrayList<String>();
for( String string : listData ) {
if( query == null || string.contains( query ) ) {
listFilteredData.add( string );
}
}
return listFilteredData;
}//met
private class LoaderCallBacks implements LoaderCallbacks< List<String>> {
@Override
public void onLoadFinished(Loader<List<String>> loader,
List<String> listData) {
adapter.setListData( listData );
}// met
@Override
public void onLoaderReset(Loader<List<String>> listData) {
adapter.setListData( new ArrayList<String>() );
}// met
@Override
public Loader<List<String>> onCreateLoader(int arg0,
Bundle arg1) {
return loader;
}// met
}//class
private class StringAdapter extends ArrayAdapter< String > {
private List<String> listDataToDisplay = new ArrayList<String>();
private LayoutInflater mInflater;
public StringAdapter( List<String> listData ) {
super( getActivity(), android.R.layout.simple_list_item_1, android.R.id.text1, listData );
listDataToDisplay = listData;
mInflater = (LayoutInflater)getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}//cons
private void setListData( List<String> newListData ) {
this.listDataToDisplay.clear();
this.listDataToDisplay.addAll( newListData );
notifyDataSetChanged();
}//met
/**
* Populate new items in the list.
*/
@Override public View getView(int position, View convertView, ViewGroup parent) {
View view;
if (convertView == null) {
view = mInflater.inflate(android.R.layout.simple_list_item_1, parent, false);
} else {
view = convertView;
}
((TextView)view.findViewById( android.R.id.text1)).setText( listDataToDisplay.get( position ) );
return view;
}
}//inner class
}//class
class StringLoader extends AsyncTaskLoader<List<String>> {
SearchFragment fragment = null;
public StringLoader(Context context, SearchFragment fragment) {
super(context);
this.fragment = fragment;
}// cons
@Override
public List<String> loadInBackground() {
return fragment.getData();
}// met
}// class
O arquivo xml para o menu dos fragmentos de pesquisa res / menu / menu_search.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:baselineAligned="false"
android:orientation="horizontal" >
<FrameLayout
android:id="@+id/fragment"
android:layout_width="0px"
android:layout_height="match_parent"
android:layout_weight="1" />
</LinearLayout>
E o arquivo de layout xml res / layout / search_in_fragments.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:baselineAligned="false"
android:orientation="horizontal" >
<FrameLayout
android:id="@+id/fragment"
android:layout_width="0px"
android:layout_height="match_parent"
android:layout_weight="1" />
</LinearLayout>