我正在调用AsyncTask中的条件。但是当运行应用程序时它只执行if内的第一个else条件应用程序崩溃。
我在这做错了什么？
class LoadingModuleLayout extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
Log.d("Loading", "Menu Modules Loading");
}
@Override
protected String doInBackground(String... args) {
Log.d("module_name", module_name);
String response = null;
Map<String, Object> data = new LinkedHashMap<String, Object>();
data.put(SESSION, sessionId);
data.put(MODULE_NAME, module_name);
data.put(QUERY, query != null ? query.toLowerCase() : "");
data.put(ORDER_BY, orderBy != null ? orderBy : "");
data.put(OFFSET, offset != null ? offset : "");
data.put(
SELECT_FIELDS,
(selectFields != null && selectFields.length != 0) ? new JSONArray(
Arrays.asList(selectFields)) : "");
try {
JSONArray nameValueArray = new JSONArray();
if (linkNameToFieldsArray != null
&& linkNameToFieldsArray.size() != 0) {
for (Entry<String, List<String>> entry : linkNameToFieldsArray
.entrySet()) {
JSONObject nameValue = new JSONObject();
nameValue.put("name", entry.getKey());
nameValue.put("value", new JSONArray(entry.getValue()));
nameValueArray.put(nameValue);
}
}
data.put(LINK_NAME_TO_FIELDS_ARRAY, nameValueArray);
data.put(MAX_RESULTS, maxResults != null ? maxResults : "");
data.put(DELETED, deleted != null ? deleted : 0);
String restData = org.json.simple.JSONValue.toJSONString(data);
HttpClient httpClient = new DefaultHttpClient();
HttpPost req = new HttpPost(restURL);
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair(METHOD,
GET_ENTRY_LIST));
nameValuePairs.add(new BasicNameValuePair(INPUT_TYPE, JSON));
nameValuePairs.add(new BasicNameValuePair(RESPONSE_TYPE, JSON));
nameValuePairs.add(new BasicNameValuePair(REST_DATA, restData));
req.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Send POST request
httpClient.getParams().setBooleanParameter(
CoreProtocolPNames.USE_EXPECT_CONTINUE, false);
HttpResponse res = httpClient.execute(req);
response = EntityUtils.toString(res.getEntity());
if (response == null) {
Log.e("LOG_TAG", "FAILED TO CONNECT!");
}
// Log.e("LOG_TAG", "response is : " + response);
JSONObject responseJObj = new JSONObject(response);
// Log.d("responseJObj", responseJObj.toString());
JSONArray jArray = responseJObj.getJSONArray(ENTRY_LIST);
for (int i = 0; i < jArray.length(); i++) {
JSONObject obj = jArray.getJSONObject(i);
//Log.d("obj", obj.toString());
//JSONObject objName = new JSONObject("name");
id = obj.getString("id");
JSONObject name_value_list = obj
.getJSONObject("name_value_list");
if(module_name.equals("Accounts")){
JSONObject name = name_value_list.getJSONObject("name");
acc_name = name.getString("value");
entry_names.add(acc_name);
}
else if(module_name.equals("Contacts")){
JSONObject first_name = name_value_list.getJSONObject("first_name");
cnt_f_name = first_name.getString("value");
JSONObject last_name = name_value_list.getJSONObject("last_name");
cnt_l_name = last_name.getString("value");
cnt_name = cnt_f_name+" "+cnt_l_name;
entry_names.add(cnt_name);
}
entry_ids.add(id);
}
Log.d("value ", acc_name);
} catch (JSONException jo) {
// Log.e("LOG_TAG", "response is : " + response);
} catch (IOException ioe) {
}
return null;
}
protected void onPostExecute(String file_url) {
Log.d(TAG,entry_names.toString());
EntriesListAdapter draweradapter= new EntriesListAdapter(getActivity()
.getApplicationContext(), entry_names);
mEntryList.setAdapter(draweradapter);
}
}
----- ---- logcat中
12-10 09:52:36.637: E/AndroidRuntime(1621): FATAL EXCEPTION: AsyncTask #2
12-10 09:52:36.637: E/AndroidRuntime(1621): Process: com.wakensys.sugercrm_wakensys, PID: 1621
12-10 09:52:36.637: E/AndroidRuntime(1621): java.lang.RuntimeException: An error occured while executing doInBackground()
12-10 09:52:36.637: E/AndroidRuntime(1621): at android.os.AsyncTask$3.done(AsyncTask.java:300)
12-10 09:52:36.637: E/AndroidRuntime(1621): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
12-10 09:52:36.637: E/AndroidRuntime(1621): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
12-10 09:52:36.637: E/AndroidRuntime(1621): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
12-10 09:52:36.637: E/AndroidRuntime(1621): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
12-10 09:52:36.637: E/AndroidRuntime(1621): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
12-10 09:52:36.637: E/AndroidRuntime(1621): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
12-10 09:52:36.637: E/AndroidRuntime(1621): at java.lang.Thread.run(Thread.java:841)
12-10 09:52:36.637: E/AndroidRuntime(1621): Caused by: java.lang.NullPointerException: println needs a message
12-10 09:52:36.637: E/AndroidRuntime(1621): at android.util.Log.println_native(Native Method)
12-10 09:52:36.637: E/AndroidRuntime(1621): at android.util.Log.d(Log.java:139)
12-10 09:52:36.637: E/AndroidRuntime(1621): at com.wakensys.sugercrm_wakensys.fragments.Fragment_Entries$LoadingModuleLayout.doInBackground(Fragment_Entries.java:240)
12-10 09:52:36.637: E/AndroidRuntime(1621): at com.wakensys.sugercrm_wakensys.fragments.Fragment_Entries$LoadingModuleLayout.doInBackground(Fragment_Entries.java:1)
12-10 09:52:36.637: E/AndroidRuntime(1621): at android.os.AsyncTask$2.call(AsyncTask.java:288)
12-10 09:52:36.637: E/AndroidRuntime(1621): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
答案 0 :(得分：2)
始终尝试记录，就像这样
Log.d("module_name", ""+module_name);
而不是
Log.d("module_name", module_name);
通过使用此方法，您可以避免使用NullPointerExceptions。
答案 1 :(得分：1)
您正在将null传递给日志语句。我想，看看240行。