我有一个异常，我无法通过调试器日志解决。 我是eclipse的新手，所以我希望你能帮忙，这将是完美的。
所以我得到了2个webservices，它们在一个片段中调用，以填充listview和该片段中的微调器。
第一个webservice 被称为oncreateview（），并填充微调器成功。
第二个webservice 由按钮点击事件调用，并将获得另一个响应（此响应有两个帖子变量）。
Json响应是正确的，但它在行（ ScheduleList.add（Sche）; ）中得到异常，但奇怪的是在其他类（不是这个）上。
我有两个模型类，“Schedule”和“Teacher”，可以与每个Web服务进行交互。
你认为这与同一片段上的两个异步函数有关吗？
private class GetTeachersInfo extends AsyncTask<String, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("A processar horários..");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(String... arg) {
String professor = arg[0];
String dia_Semana = arg[1];
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("professor", professor));
params.add(new BasicNameValuePair("Dia_Semana", dia_Semana));
ServiceHandler jsonParser = new ServiceHandler();
String json = jsonParser.makeServiceCall(URL_TEACHERSINFO, ServiceHandler.POST, params);
Log.e("Response: ", "> " + json);
if (json != null) {
try {
JSONObject jsonObj = new JSONObject(json);
if (jsonObj != null) {
JSONArray schedules = jsonObj
.getJSONArray("horarios");
for (int i = 0; i < schedules.length(); i++) {
JSONObject ScheObj = (JSONObject) schedules.get(i);
Schedule Sche = new Schedule(ScheObj.getInt("Cod_Horario"),ScheObj.getString("T_Entrada"),
ScheObj.getString("T_Saida"),ScheObj.getString("Dia_Semana"),ScheObj.getString("Professor"),ScheObj.getString("Disciplina"),ScheObj.getString("Sala"),ScheObj.getString("Turma"));
ScheduleList.add(Sche);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("JSON Data", "Didn't receive any data from server!");
}
return null;
}
编辑：
错误日志：
06-07 08:53:59.009: E/Response:(1816): > {"horarios":[{"Cod_Horario":5,"T_Entrada":"08:20","T_Saida":"09:05","Dia_Semana":"4\u00aa Feira","Professor":"Ligia Sofia da Costa Nunes","Disciplina":"Ed.Fisic","Sala":"GIN","Turma":"10-F"},{"Cod_Horario":6,"T_Entrada":"09:05","T_Saida":"09:50","Dia_Semana":"4\u00aa Feira","Professor":"Ligia Sofia da Costa Nunes","Disciplina":"Ed.Fisic","Sala":"GIN","Turma":"10-F"},{"Cod_Horario":9,"T_Entrada":"11:45","T_Saida":"12:30","Dia_Semana":"4\u00aa Feira","Professor":"Ligia Sofia da Costa Nunes","Disciplina":"Ed.Fisic","Sala":"GIN","Turma":"11-G"},{"Cod_Horario":10,"T_Entrada":"12:30","T_Saida":"13:15","Dia_Semana":"4\u00aa Feira","Professor":"Ligia Sofia da Costa Nunes","Disciplina":"Ed.Fisic","Sala":"GIN","Turma":"11-G"}],"success":1}
06-07 08:57:05.002: W/dalvikvm(1816): threadid=11: thread exiting with uncaught exception (group=0xb2caab20)
06-07 08:57:10.922: E/AndroidRuntime(1816): FATAL EXCEPTION: AsyncTask #1
06-07 08:57:10.922: E/AndroidRuntime(1816): Process: info.androidhive.tabsswipe, PID: 1816
06-07 08:57:10.922: E/AndroidRuntime(1816): java.lang.RuntimeException: An error occured while executing doInBackground()
06-07 08:57:10.922: E/AndroidRuntime(1816): at android.os.AsyncTask$3.done(AsyncTask.java:300)
06-07 08:57:10.922: E/AndroidRuntime(1816): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
06-07 08:57:10.922: E/AndroidRuntime(1816): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
06-07 08:57:10.922: E/AndroidRuntime(1816): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
06-07 08:57:10.922: E/AndroidRuntime(1816): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
06-07 08:57:10.922: E/AndroidRuntime(1816): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
06-07 08:57:10.922: E/AndroidRuntime(1816): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
06-07 08:57:10.922: E/AndroidRuntime(1816): at java.lang.Thread.run(Thread.java:841)
06-07 08:57:10.922: E/AndroidRuntime(1816): Caused by: java.lang.NullPointerException
06-07 08:57:10.922: E/AndroidRuntime(1816): at info.androidhive.tabsswipe.ProfessoresFragment$GetTeachersInfo.doInBackground(ProfessoresFragment.java:210)
06-07 08:57:10.922: E/AndroidRuntime(1816): at info.androidhive.tabsswipe.ProfessoresFragment$GetTeachersInfo.doInBackground(ProfessoresFragment.java:1)
06-07 08:57:10.922: E/AndroidRuntime(1816): at android.os.AsyncTask$2.call(AsyncTask.java:288)
06-07 08:57:10.922: E/AndroidRuntime(1816): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
06-07 08:57:10.922: E/AndroidRuntime(1816): ... 4 more
06-07 08:57:11.642: E/WindowManager(1816): android.view.WindowLeaked: Activity info.androidhive.tabsswipe.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{b3126950 V.E..... R......D 0,0-456,144} that was originally added here
06-07 08:57:11.642: E/WindowManager(1816): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:346)
06-07 08:57:11.642: E/WindowManager(1816): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248)
06-07 08:57:11.642: E/WindowManager(1816): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
06-07 08:57:11.642: E/WindowManager(1816): at android.app.Dialog.show(Dialog.java:286)
06-07 08:57:11.642: E/WindowManager(1816): at info.androidhive.tabsswipe.ProfessoresFragment$GetTeachersInfo.onPreExecute(ProfessoresFragment.java:181)
06-07 08:57:11.642: E/WindowManager(1816): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
06-07 08:57:11.642: E/WindowManager(1816): at android.os.AsyncTask.execute(AsyncTask.java:535)
06-07 08:57:11.642: E/WindowManager(1816): at info.androidhive.tabsswipe.ProfessoresFragment$1.onClick(ProfessoresFragment.java:74)
06-07 08:57:11.642: E/WindowManager(1816): at android.view.View.performClick(View.java:4438)
06-07 08:57:11.642: E/WindowManager(1816): at android.view.View$PerformClick.run(View.java:18422)
06-07 08:57:11.642: E/WindowManager(1816): at android.os.Handler.handleCallback(Handler.java:733)
06-07 08:57:11.642: E/WindowManager(1816): at android.os.Handler.dispatchMessage(Handler.java:95)
06-07 08:57:11.642: E/WindowManager(1816): at android.os.Looper.loop(Looper.java:136)
06-07 08:57:11.642: E/WindowManager(1816): at android.app.ActivityThread.main(ActivityThread.java:5001)
06-07 08:57:11.642: E/WindowManager(1816): at java.lang.reflect.Method.invokeNative(Native Method)
06-07 08:57:11.642: E/WindowManager(1816): at java.lang.reflect.Method.invoke(Method.java:515)
06-07 08:57:11.642: E/WindowManager(1816): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
06-07 08:57:11.642: E/WindowManager(1816): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
06-07 08:57:11.642: E/WindowManager(1816): at dalvik.system.NativeStart.main(Native Method)
全班代码：
public class TurmasFragment extends Fragment {
private ListView listviewHorarios;
private Spinner spinnerTurmas;
private Spinner spinnerDia_Semana;
private Button buttonSearch;
// array list for spinner adapter
private ArrayList<Class> ClassList;
private ArrayList<Schedule> ScheduleList;
ProgressDialog pDialog;
// API urls
// Url to get all teachers
private String URL_CLASSES = "http://10.0.2.2/android/GetAllClassesJson.php";
private String URL_CLASSESINFO = "http://10.0.2.2/android/GetClassJson.php";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_turmas, container, false);
listviewHorarios = (ListView) rootView.findViewById(R.id.list);
spinnerTurmas = (Spinner) rootView.findViewById(R.id.spinner);
spinnerDia_Semana = (Spinner) rootView.findViewById(R.id.spinner2);
buttonSearch = (Button) rootView.findViewById(R.id.button);
buttonSearch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// new category name
String turma = spinnerTurmas.getSelectedItem().toString();
String dia_Semana = spinnerDia_Semana.getSelectedItem().toString();
//String newCategory = txtCategory.getText().toString();
// Call a sync task to create new category
new GetClassesInfo().execute(turma, dia_Semana);
}
});
ClassList = new ArrayList<Class>();
//spinnerProfessores.setOnItemSelectedListener(this);
new GetClasses().execute();
return rootView;
}
private void populateSpinner() {
List<String> lables = new ArrayList<String>();
for (int i = 0; i < ClassList.size(); i++) {
lables.add(ClassList.get(i).getTurma());
}
// Creating adapter for spinner
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_spinner_item, lables);
// Drop down layout style - list view with radio button
spinnerAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
spinnerTurmas.setAdapter(spinnerAdapter);
}
private void populateListView() {
ListScheduleAdapter adapter = new ListScheduleAdapter(getActivity(), ScheduleList);
listviewHorarios.setAdapter(adapter);
}
private class GetClasses extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("A processar turmas..");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
ServiceHandler jsonParser = new ServiceHandler();
String json = jsonParser.makeServiceCall(URL_CLASSES, ServiceHandler.GET);
Log.e("Response: ", "> " + json);
if (json != null) {
try {
JSONObject jsonObj = new JSONObject(json);
if (jsonObj != null) {
JSONArray classes = jsonObj
.getJSONArray("turmas");
for (int i = 0; i < classes.length(); i++) {
JSONObject ClaObj = (JSONObject) classes.get(i);
Class cla = new Class(ClaObj.getInt("Cod_Turma"),
ClaObj.getString("Turma"));
ClassList.add(cla);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("JSON Data", "Didn't receive any data from server!");
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
populateSpinner();
}
}
private class GetClassesInfo extends AsyncTask<String, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("A processar horários..");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(String... arg) {
String turma = arg[0];
String dia_Semana = arg[1];
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("Turma", turma));
params.add(new BasicNameValuePair("Dia_Semana", dia_Semana));
ServiceHandler jsonParser = new ServiceHandler();
String json = jsonParser.makeServiceCall(URL_CLASSESINFO, ServiceHandler.POST, params);
Log.e("Response: ", "> " + json);
if (json != null) {
try {
JSONObject jsonObj = new JSONObject(json);
if (jsonObj != null) {
JSONArray schedules = jsonObj
.getJSONArray("horarios");
for (int i = 0; i < schedules.length(); i++) {
JSONObject ScheObj = (JSONObject) schedules.get(i);
Schedule Sche = new Schedule(ScheObj.getInt("Cod_Horario"),ScheObj.getString("T_Entrada"),
ScheObj.getString("T_Saida"),ScheObj.getString("Dia_Semana"),ScheObj.getString("Professor"),ScheObj.getString("Disciplina"),ScheObj.getString("Sala"),ScheObj.getString("Turma"));
ScheduleList.add(Sche);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("JSON Data", "Didn't receive any data from server!");
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
populateListView();
}
}
}