我有一个Activity来调用onSearchRequested()并打开YelpResultsActivity。一旦进入YelpResultsActivity，如果用户希望重新搜索而不回到之前的Activity，我希望能够打开搜索小部件并使用新查询重新搜索。我在清单中有singleTop并覆盖onSearchRequested()。即使使用测试“黄金”，它也会显示之前的搜索。它确实只在我YelpResultsActivity内部时调用，我通过日志消息测试它。我错过了什么？如何让用户在YelpResultsActivity内重新搜索？！
编辑：我注意到在第二次搜索后将视图更改为横向时，此功能正常。因此，如果我可以刷新视图而不会崩溃，我可以让它工作。
的AndroidManifest.xml
<activity
android:label="@string/app_name"
android:launchMode="singleTop"
android:name=".YelpResultsActivity" >
<!-- Setup the search configuration -->
<meta-data
android:name="android.app.searchable"
android:resource="@xml/searchable" />
<!-- Declare the intent for popup upon callback -->
<intent-filter >
<action android:name="android.intent.action.SEARCH" />
</intent-filter>
<intent-filter >
<action android:name="android.intent.action.VIEW" />
</intent-filter>
</activity>
<activity android:name="groupo.travellight.app.TripActivity"
android:label="Trips"
android:icon="@drawable/ic_action_trip">
<!-- enable the search widget to send searches to YelpResultsActivity -->
<meta-data android:name="android.app.default_searchable"
android:value=".YelpResultsActivity" />
</activity>
TripActivity.java在菜单项
中调用搜索小部件@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.menu_yelpsearch:
onSearchRequested(); //call search dialog
return true;
default:
return super.onOptionsItemSelected(item);
}
}
YelpResultsActivity.java只使用自定义适配器获取结果并将其发布到自定义列表视图。
// Callback on creation of results activity
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setTitle("Results"); //set the actionbar title
handleIntent(getIntent());
}
// Callback detected from activity thread
public void onNewIntent(Intent intent)
{
setIntent(intent);
handleIntent(intent);
}
// Callback detected from the search dialog
// call the search logic
private void handleIntent(Intent intent)
{
// If it was the action search intent search yelp
if (Intent.ACTION_SEARCH.equals(intent.getAction()))
{
String query = intent.getStringExtra(SearchManager.QUERY);
new SearchYelp().execute(query); //execute new thread and call the query
}
}
@Override
public boolean onSearchRequested()
{
new SearchYelp().execute("golf"); //execute new thread and call the query
return true;
}
/**
* Post the results of the SearchYelp thread
*/
private void postResults()
{
ArrayList<HashMap<String, String>> sList = new ArrayList<HashMap<String, String>>();
// For every item in the JSON bundle
// add details from JSON string to a hashmap
for (int i = 0; i < jsonResponse.getBundleSize(); i++)
{
HashMap<String, String> map = new HashMap<String, String>();
// Yelp result strings, post parsed
map.put(KEY_NAME, jsonResponse.getBusinessName(i));
map.put(KEY_DESCRIPTION, jsonResponse.getSnippet(i));
map.put(KEY_RATINGURL, jsonResponse.getRatingURL(i));
map.put(KEY_THUMBURL, jsonResponse.getThumbURL(i));
map.put(KEY_RATINGINT, jsonResponse.getRating(i));
sList.add(map); //add the hashmap to the list
}
adapter = new CustomAdapter(this, sList); //send the details to the data adapter
setListAdapter(adapter); //set the adapter for this activity as the custom adapter
}
/**
* Thread that accesses yelp API via JSON
*
* @author Brant Unger
* @version 0.1
*/
class SearchYelp extends AsyncTask<String, Void, String>
{
String stringJSON;
/**
* Functionality called in a seperate thread
* @param query
* @return String JSON formatted response
*/
protected String doInBackground(String... query)
{
try
{
stringJSON = new Yelp().search(query[0], "Mesa, AZ");
jsonResponse.setResponse(stringJSON);
jsonResponse.parseBusiness(); //parse JSON data
}
catch (Exception e)
{
System.out.println(e.getMessage());
}
return stringJSON;
}
/**
* Post the results of the query
* @param query Search parameter called from above
*/
protected void onPostExecute(String query)
{
postResults();
}
}
}
CustomAdapter.java
/**
* Custom data adapter that places yelp data into the proper layout fields
* @author Brant Unger
* @version 0.2
*/
public class CustomAdapter extends BaseAdapter
{
private ArrayList<HashMap<String, String>> data;
private static LayoutInflater inflater;
private Activity activity;
/**
* Constructor for a custom data adapter to handle
* posting yelp results to a custom user interface
* @param activityCaller Activity The activity where the data is called from
* @param dataCaller ArrayList The list containing a hashmap of yelp results
*/
public CustomAdapter(Activity activityCaller, ArrayList<HashMap<String, String>> dataCaller)
{
activity = activityCaller;
data = dataCaller;
inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
/**
* Inherited method from BaseAdapter that returns the size of
* the data in the adapter
* @return int The number of yelp results
*/
public int getCount()
{
return data.size();
}
/**
* Get the object
* @param position The index of where the data is being held
* @return The item's position
*/
public Object getItem(int position)
{
return position;
}
/**
* Get the item's numerical ID
* @param position The index of where the data is being held
* @return The item's position
*/
public long getItemId(int position)
{
return position;
}
/**
* Inherited method from BaseAdapter that returns an inflated
* view generated via data held in the adapter
* @param position The index of where the data is being held
* @param convertView The view to grab and convert
* @param parent The parent where the view can be found
* @return View The view populated with data
*/
public View getView(int position, View convertView, ViewGroup parent)
{
View viewInflater = convertView;
if (convertView == null)
{
viewInflater = inflater.inflate(R.layout.custom_list_row, null);
}
// Define activity objects for use in posting the data into the UI
TextView businessName = (TextView) viewInflater.findViewById(R.id.businessName);
TextView description = (TextView) viewInflater.findViewById(R.id.description);
TextView ratingInt = (TextView) viewInflater.findViewById(R.id.ratingInt);
ImageView thumbImg = (ImageView) viewInflater.findViewById(R.id.list_image);
ImageView ratingStars = (ImageView) viewInflater.findViewById(R.id.ratingImg);
// Define a new result and set it at the current adapter index
HashMap<String, String> result = new HashMap<String, String>();
result = data.get(position);
// Set all the UI details into the view
businessName.setText(result.get(YelpResultsActivity.KEY_NAME));
description.setText(result.get(YelpResultsActivity.KEY_DESCRIPTION));
ratingInt.setText(result.get(YelpResultsActivity.KEY_RATINGINT));
// Download and set the rating star and thumbnail images
new DownloadImageTask(ratingStars)
.execute(result.get(YelpResultsActivity.KEY_RATINGURL));
new DownloadImageTask(thumbImg)
.execute(result.get(YelpResultsActivity.KEY_THUMBURL));
return viewInflater;
}
/**
* Download thumbnail image and set it into the UI
* via a separate thread
*/
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap>
{
ImageView bmImage;
public DownloadImageTask(ImageView bmImage)
{
this.bmImage = bmImage;
}
/**
* Download and set the image into the UI in the background.
* @param urls String URL of the image location
* @return Bitmap Returns the image to post
*/
protected Bitmap doInBackground(String... urls)
{
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try
{
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e)
{
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}
/**
* Call cleanup and set the image to the UI
* @param result Image result
*/
protected void onPostExecute(Bitmap result)
{
bmImage.setImageBitmap(result);
}
}
}
答案 0 :(得分：0)
改变这些做了我想做的事情：
//make this a class variable
ArrayList<HashMap<String, String>> sList = new ArrayList<HashMap<String, String>>();
// Callback detected from the search dialog
// call the search logic
private void handleIntent(Intent intent)
{
// If the adapter is not null it means it has items in it
// this means we are re-searching and need to reset the list
// and adapter
if (adapter != null)
{
sList.clear();
finish();
startActivity(intent);
}
// If it was the action search intent search yelp
if (Intent.ACTION_SEARCH.equals(intent.getAction()))
{
String query = intent.getStringExtra(SearchManager.QUERY);
new SearchYelp().execute(query); //execute new thread and call the query
}
}
/**
* Post the results of the SearchYelp thread
*/
private void postResults()
{
// For every item in the JSON bundle
// add details from JSON string to a hashmap
for (int i = 0; i < jsonResponse.getBundleSize(); i++)
{
HashMap<String, String> map = new HashMap<String, String>();
// Yelp result strings, post parsed
map.put(KEY_NAME, jsonResponse.getBusinessName(i));
map.put(KEY_DESCRIPTION, jsonResponse.getSnippet(i));
map.put(KEY_RATINGURL, jsonResponse.getRatingURL(i));
map.put(KEY_THUMBURL, jsonResponse.getThumbURL(i));
map.put(KEY_RATINGINT, jsonResponse.getRating(i));
sList.add(map); //add the hashmap to the list
}
adapter = new CustomAdapter(this, sList); //send the details to the data adapter
setListAdapter(adapter); //set the adapter for this activity as the custom adapter
}