我应该把 ArrayAdapter 放在哪里？我是新手。我收到一条错误消息：构造函数 ArrayAdapter(new Runnable(){}, int, int, ArrayList>)。必须编写与带有 SimpleArray 的注释部分等效的代码。
public class SearchEventsActivity extends ListActivity {
// Progress Dialog
private ProgressDialog pDialog;
EditText inputSearch;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> eventsList;
ListView lv;
// url to get all events list
private static String url_all_events = "http://10.0.2.2/indiJam/search_all_events.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_EVENTS = "events";
private static final String TAG_NAME = "event_name";
private static final String TAG_DATE = "date";
private static final String TAG_LOCATION = "location";
private static final String TAG_CATEGORY = "category";
// products JSONArray
JSONArray events = null;
ArrayAdapter<String> adapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search);
// Hashmap for ListView
ArrayList<HashMap<String, String>> eventsList;
// Loading products in Background Thread
new LoadAllEvents().execute();
}
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllEvents extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(SearchEventsActivity.this);
pDialog.setMessage("Loading events...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All events from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_events, "GET", params);
// Check your log cat for JSON reponse
Log.d("All Events: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// events found
// Getting Array of Events
events = json.getJSONArray(TAG_EVENTS);
// looping through All Products
for (int i = 0; i < events.length(); i++) {
JSONObject c = events.getJSONObject(i);
// Storing each json item in variable
String name = c.getString(TAG_NAME);
String date = c.getString(TAG_DATE);
String location = c.getString(TAG_LOCATION);
String category = c.getString(TAG_CATEGORY);
// URL decoding
name = name.replace("+", " ");
name = name.replace("%27", "\'");
category = category.replace("+", " ");
category = category.replace("%27", "\'");
location = location.replace("+", " ");
location = location.replace("%27", "\'");
// Adding headers
date = "On: " + date;
location = "At: " + location;
category = "Under: " + category;
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_NAME, name);
map.put(TAG_DATE, date);
map.put(TAG_LOCATION, location);
map.put(TAG_CATEGORY, category);
// adding HashList to ArrayList
eventsList.add(map);
}
}
else
{
// no products found
// Launch Add New product Activity
Intent i = new Intent(getApplicationContext(),
CreateEventActivity.class);
// Closing all previous activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
/*
ListAdapter adapter = new SimpleAdapter(
SearchEventsActivity.this, eventsList,
R.layout.list_item, new String[] {
TAG_NAME,TAG_DATE,TAG_LOCATION,TAG_CATEGORY},
new int[] {R.id.name,R.id.date,R.id.location,R.id.category });
// updating listview
setListAdapter(adapter);
*/
//adapter = new ArrayAdapter<String>(SearchEventsActivity.this, R.layout.list_item, R.id.name, eventsList);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
R.layout.list_item, R.id.name, eventsList);
inputSearch = (EditText) findViewById(R.id.inputSearch);
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
((ArrayAdapter<?>)SearchEventsActivity.this.adapter).getFilter().filter(cs);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
});
}
});
}
}
}