/**
* Initialize the action menu on action bar
*/
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.action_bar, menu);
//set up the search
MenuItem searchItem = menu.findItem(R.id.action_search);
SearchView mSearchView = (SearchView) searchItem.getActionView();
searchItem.setShowAsActionFlags(MenuItem.SHOW_AS_ACTION_IF_ROOM
| MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW);
//set up the query listener
mSearchView.setOnQueryTextListener(new OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
//start the search intent
Intent searchIntent = new Intent(MainActivity.this, SearchResultsActivity.class);
searchIntent.putExtra(SEARCH_MESSAGE, query);
startActivity(searchIntent);
return false;
}
@Override
public boolean onQueryTextChange(String query) {
//do nothing in our case
return true;
}
});
return super.onCreateOptionsMenu(menu);
}
代码示例 3: 操作栏初始化代码
以及 SearchResultsActivity 类:
public class SearchResultsActivity extends Activity{
TextView mQueryText;
GridView searchListResults;
SearchAdapter adapter;
Vector<com.example.restaurant.MenuFactory.MenuItem> searchList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search_query_grid_results);
mQueryText = (TextView) findViewById(R.id.txt_query);
//setup the grid view
searchListResults = (GridView)findViewById(R.id.search_results);
searchList= new Vector<com.example.restaurant.MenuFactory.MenuItem>();
//get and process search query here
final Intent queryIntent = getIntent();
doSearchQuery(queryIntent);
adapter= new SearchAdapter(this,searchList);
searchListResults.setAdapter(adapter);
//Listener for grid view
searchListResults.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id){
FragmentTransaction ft = getFragmentManager().beginTransaction();
Fragment prev = getFragmentManager().findFragmentByTag("dialog");
if (prev != null) {
ft.remove(prev);
}
ft.addToBackStack(null);
DialogFragment newFragment = SearchResultsDialogFragment.newInstance(searchList.elementAt(position));
newFragment.show(ft, "dialog");
}
});
}
代码示例 4: 主要的搜索结果类 (下面还会有)
当我们构建这个列表是，我们也将会处理没有查询到任何匹配项的情况下应该怎么做. 如果没有匹配，我们会查搜索的人显示一个消息对话框，让他们知晓，并且关闭搜索的activity，他们就不会看到一个空白的界面了.
/**
* Builds the found item list.
*/
private void doSearchQuery(final Intent queryIntent) {
//Get the query text
String message= queryIntent.getStringExtra(MainActivity.SEARCH_MESSAGE);
//Set the UI field
mQueryText.setText(message);
RestaurantDatabase dB= new RestaurantDatabase(this);
MenuFactory mMF= MenuFactory.getInstance();
Cursor c= dB.searchMenuItems(message);
Set<String> categories = new HashSet<String>();
while (c.moveToNext()) {
String category = c.getString(c.getColumnIndexOrThrow(RestaurantDatabase.MenuColumns.CATEGORY));
categories.add(category);
//build a new menu item and add it to the list
MenuItem item= mMF.new MenuItem();
item.setCategory(category);
item.setName(c.getString(c.getColumnIndexOrThrow(RestaurantDatabase.MenuColumns.NAME)));
item.setDescription(c.getString(c.getColumnIndexOrThrow(RestaurantDatabase.MenuColumns.DESCRIPTION)));
item.setNutrition(c.getString(c.getColumnIndexOrThrow(RestaurantDatabase.MenuColumns.NUTRITION)));
item.setPrice(c.getString(c.getColumnIndexOrThrow(RestaurantDatabase.MenuColumns.PRICE)));
item.setImageName(c.getString(c.getColumnIndexOrThrow(RestaurantDatabase.MenuColumns.IMAGENAME)));
searchList.add(item);
}
c.close();
//Handle the case of not finding anything
if(searchList.size()==0){
Intent intent = new Intent(SearchResultsActivity.this, OrderViewDialogue.class);
intent.putExtra(OrderViewActivity.DIALOGUE_MESSAGE, "Sorry, no matching items found.");
startActivity(intent);
SearchResultsActivity.this.finish();
}
}
代码示例 4 续