我对此代码有疑问。代码在Main Activity中,ArtGeneralButton是一个填充特定列表视图的按钮。因此,有一个负责更新的类(UpdateAnsList)。我使用一个名为StartUpdateAnsList的方法。但是
有问题 listView = (ListView) findViewById(R.id.listView11);
我需要为名为SelectAtivity的Activity充气,因为listview11位于此Activity(布局)中。我不想使用所有代码来膨胀。可以使用不同的东西吗?
MainActivity
...
public void ArtGeneralButton(View view){
selsub = view.getId();
UpdateAnsList myUpdate = new UpdateAnsList();
myUpdate.StartUpdateAnsList(this, selsub);
}
...
UpdateAnsList
...
public class UpdateAnsList {
/**
* @param args
*/
final static String ARG_POSITION_ANSWER = "position";
private String jsonResult;
private ListView listView;
private Context context;
public int selsub;
public UpdateAnsList(){
}
public void StartUpdateAnsList(Context c, int v){
listView = (ListView) findViewById(R.id.listView11);
context = c;
selsub = v;
selectItemAns(selsub);
accessWebService();
}
private void selectItemAns(int position) {
switch(position){
case R.id.button001:
\\action
break;
case 0:
\\action
break;
case 2:
\\action
break;
case 3:
break;
case 4:
break;
case 5:
break;
case 6:
break;
}
}
// Async Task to access the web
private class JsonReadTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(params[0]);
try {
HttpResponse response = httpclient.execute(httppost);
jsonResult = inputStreamToString(
response.getEntity().getContent()).toString();
}
catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private StringBuilder inputStreamToString(InputStream is) {
String rLine = "";
StringBuilder answer = new StringBuilder();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
try {
while ((rLine = rd.readLine()) != null) {
answer.append(rLine);
}
}
catch (IOException e) {
// e.printStackTrace();
//Toast.makeText(getApplicationContext(),
// "Error..." + e.toString(), Toast.LENGTH_LONG).show();
}
return answer;
}
@Override
protected void onPostExecute(String result) {
ListDrwaer();
}
}// end async task
public void accessWebService() {
JsonReadTask task = new JsonReadTask();
// passes values for the urls string array
task.execute(new String[] { url });
}
// build hash set for list view
public void ListDrwaer() {
List<Map<String, String>> employeeList = new ArrayList<Map<String, String>>();
try {
JSONObject jsonResponse = new JSONObject(jsonResult);
JSONArray jsonMainNode = jsonResponse.optJSONArray("emp_info");
for (int i = 0; i < jsonMainNode.length(); i++) {
JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);
String name = jsonChildNode.optString("employee name");
String number = jsonChildNode.optString("employee no");
String outPut = name + "-" + number;
employeeList.add(createEmployee("employees", outPut));
}
} catch (JSONException e) {
//Toast.makeText(getApplicationContext(), "Error" + e.toString(),
// Toast.LENGTH_SHORT).show();
}
SimpleAdapter simpleAdapter = new SimpleAdapter(context, employeeList,
android.R.layout.simple_list_item_1,
new String[] { "employees" }, new int[] { android.R.id.text1 });
listView.setAdapter(simpleAdapter);
//Toast.makeText(getApplication(), "c", Toast.LENGTH_SHORT).show();
}
private HashMap<String, String> createEmployee(String name, String number) {
HashMap<String, String> employeeNameNo = new HashMap<String, String>();
employeeNameNo.put(name, number);
return employeeNameNo;
}
}
答案 0 :(得分:0)
I solve the problem just to use :
listView = (ListView) this.activity.findViewById(R.id.listView11);
to use this in line to solve the problem, until now i do not have problem.
:)