Android 获取接口上的空指针异常
我想把Arraylist从一个类传递给扩展ListFragments的类,但无论何时调用它,我都会得到null指针异常 异步类Android 获取接口上的空指针异常,android,interface,android-asynctask,Android,Interface,Android Asynctask,我想把Arraylist从一个类传递给扩展ListFragments的类,但无论何时调用它,我都会得到null指针异常 异步类 public class SearchJobAsync extends AsyncTask<String, String, String> { private String response; Context c; SearchModel data; ArrayList<SearchModel> values;
public class SearchJobAsync extends AsyncTask<String, String, String> {
private String response;
Context c;
SearchModel data;
ArrayList<SearchModel> values;
getArrayList list;
public interface getArrayList {
public void getList(ArrayList<SearchModel> data);
}
public SearchJobAsync(Context c, ArrayList<SearchModel> values, getArrayList list) {
this.c = c;
this.values = values;
this.list = list;
}
public SearchJobAsync(Context c) {
this.c = c;
}
@Override
protected void onPreExecute() {
super.onPreExecute ();
CommonFunctions.showProgress (c, "Please Wait...", true);
}
@Override
protected void onPostExecute(String s) {
values = new ArrayList<SearchModel> ();
super.onPostExecute (s);
if (!s.trim ().contains ("Table")) {
Crouton.makeText ((android.app.Activity) c, "Nothing found", Style.INFO).show ();
} else {
try {
JSONObject jsonObject = new JSONObject (s);
JSONObject NewDataSet = jsonObject.getJSONObject ("NewDataSet");
if (NewDataSet.get ("Table") instanceof JSONObject) {
JSONObject table = NewDataSet.getJSONObject ("Table");
data = new SearchModel (table.getString ("Job_Category"), table.getString ("Min_Exp"), table.getString ("Max_Exp"), table.getString ("Posted_On"), table.getString ("Candidate_Counts"), table.getString ("Applications"), table.getString ("No_Of_Pos"), table.getString ("Job_Desc"), table.getString ("Job_Type"), table.getString ("Job_Hours"), table.getString ("Job_Status"), table.getString ("Job_Exp_Date"), table.getString ("Address"), table.getString ("Gender_Name"), table.getString ("Religion_Name"), table.getString ("Exp_Summary"), table.getString ("IJob_Request_ID"), table.getString ("Requestor_Name"));
values.add (data);
} else if (NewDataSet.get ("Table") instanceof JSONArray) {
JSONArray tableArray = NewDataSet.getJSONArray ("Table");
for (int i = 0; i < tableArray.length (); i++) {
JSONObject table = tableArray.getJSONObject (i);
data = new SearchModel (table.getString ("Job_Category"), table.getString ("Min_Exp"), table.getString ("Max_Exp"), table.getString ("Posted_On"), table.getString ("Candidate_Counts"), table.getString ("Applications"), table.getString ("No_Of_Pos"), table.getString ("Job_Desc"), table.getString ("Job_Type"), table.getString ("Job_Hours"), table.getString ("Job_Status"), table.getString ("Job_Exp_Date"), table.getString ("Address"), table.getString ("Gender_Name"), table.getString ("Religion_Name"), table.getString ("Exp_Summary"), table.getString ("IJob_Request_ID"), table.getString ("Requestor_Name"));
values.add (data);
}
}
if (values.size () > 0) {
list.getList (values);
}
} catch (JSONException e) {
e.printStackTrace ();
}
}
CommonFunctions.showProgress (c, "", false);
Intent i = new Intent (c, SearchJobListActivity.class);
c.startActivity (i);
}
@Override
protected String doInBackground(String... s) {
response = HttpRequest.post ("https://beta135.hamarisuraksha.com/web/WebService/HsJobService.asmx/FindJobForVendor").send ("Vendor_IEntity_Code=" + "34588A34-E969-4723-84FE-E5409B66A5B7" + "&Job_Code=" + "&Job_Category=1" + "&Exp_Years_From=0" + "&Exp_Months_From=0" + "&Exp_Years_To=0" + "&Exp_Months_To=0").body ();
response = response.replaceAll ("<[^>]*>", "").replaceAll ("\n", "");
Log.e ("Search Jobs", "" + response);
return response;
}
}
及
使用此异步的其他活动
public class SearchJobsFragment extends Fragment implements View.OnClickListener {
private View view;
private Spinner spCategory;
private Button btSearch;
private Spinner spToYrs;
private Spinner spFromMonths;
private Spinner spFromYrs;
private Spinner spToMonths;
private EditText etJobCode;
private String[] yrsArray, monthArray, professionArray;
private ArrayAdapter<String> toYrs, toMonths, profession;
private Context c;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate (R.layout.search_jobs_frag, container, false);
return view;
}
private void initialize() {
c = getActivity ();
spCategory = (Spinner) getActivity ().findViewById (R.id.sp_category);
btSearch = (Button) getActivity ().findViewById (R.id.bt_search);
spToYrs = (Spinner) getActivity ().findViewById (R.id.sp_to_yrs);
spFromMonths = (Spinner) getActivity ().findViewById (R.id.sp_from_months);
spFromYrs = (Spinner) getActivity ().findViewById (R.id.sp_from_yrs);
spToMonths = (Spinner) getActivity ().findViewById (R.id.sp_to_months);
etJobCode = (EditText) getActivity ().findViewById (R.id.et_job_code);
btSearch.setOnClickListener (this);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated (savedInstanceState);
initialize ();
spinnerSetup ();
}
private void spinnerSetup() {
//for to/from yrs
yrsArray = getResources ().getStringArray (R.array.Experience_yrss);
toYrs = new ArrayAdapter<String> (c, R.layout.spinner_textview, yrsArray);
toYrs.setDropDownViewResource (android.R.layout.simple_list_item_single_choice);
spToYrs.setAdapter (toYrs);
spFromYrs.setAdapter (toYrs);
// for to/from months
monthArray = getResources ().getStringArray (R.array.Experience_months);
toMonths = new ArrayAdapter<String> (c, R.layout.spinner_textview, monthArray);
toMonths.setDropDownViewResource (android.R.layout.simple_list_item_single_choice);
spToMonths.setAdapter (toMonths);
spFromMonths.setAdapter (toMonths);
//for category
professionArray = getResources ().getStringArray (R.array.Profession);
Arrays.sort (professionArray, 1, professionArray.length);
profession = new ArrayAdapter<String> (c, R.layout.spinner_textview, professionArray);
profession.setDropDownViewResource (android.R.layout.simple_list_item_single_choice);
spCategory.setAdapter (profession);
}
@Override
public void onClick(View view) {
SearchJobAsync searchJobAsync = new SearchJobAsync (c);
searchJobAsync.execute ();
}
}
公共类SearchJobsFragment扩展片段实现View.OnClickListener{
私人视野;
私人纺纱机类别;
私人按钮搜索;
私人纺纱机;
私人纺纱机,每月;
私人纺纱机;
私人纺纱机;
私有编辑文本和工作代码;
私有字符串[]yrsArray,monthArray,professionArray;
私人阵列适用于toYrs、toMonths、profession;
私有上下文c;
@凌驾
CreateView上的公共视图(布局、充气机、视图组容器、捆绑包保存状态){
视图=充气机。充气(R.layout.search\u jobs\u frag,container,false);
返回视图;
}
私有void初始化(){
c=getActivity();
spCategory=(微调器)getActivity().findViewById(R.id.sp_category);
btSearch=(按钮)getActivity().findViewById(R.id.bt_search);
spToYrs=(微调器)getActivity().findViewById(R.id.sp_至_yrs);
spFromMonths=(微调器)getActivity().findViewById(R.id.sp\u from\u months);
spFromYrs=(微调器)getActivity().findViewById(R.id.sp_from_yrs);
spToMonths=(微调器)getActivity().findViewById(R.id.sp_到_个月);
etJobCode=(EditText)getActivity().findViewById(R.id.et_作业代码);
btSearch.setOnClickListener(此);
}
@凌驾
已创建ActivityState上的公共无效(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
初始化();
喷丝头装置();
}
专用void喷丝头设置(){
//往返年
yrsArray=getResources().getStringArray(R.array.Experience\u yrss);
toYrs=新阵列适配器(c,R.layout.spinner_textview,yrsArray);
toYrs.setDropDownViewResource(android.R.layout.simple\u list\u item\u single\u choice);
spToYrs.setAdapter(toYrs);
spFromYrs.setAdapter(toYrs);
//往返月份
monthArray=getResources().getStringArray(R.array.Experience\u个月);
toMonths=新的阵列适配器(蒙塔雷的c、R.layout.spinner_textview);
toMonths.setDropDownViewResource(android.R.layout.simple\u list\u item\u single\u choice);
spToMonths.setAdapter(toMonths);
spFromMonths.setAdapter(明天);
//类别
professionArray=getResources().getStringArray(R.array.Profession);
Arrays.sort(professionArray,1,professionArray.length);
profession=新阵列适配器(c,R.layout.spinner\U textview,professionArray);
profession.setDropDownViewResource(android.R.layout.simple\u list\u item\u single\u choice);
spCategory.setAdapter(专业);
}
@凌驾
公共void onClick(视图){
SearchJobAsync SearchJobAsync=新的SearchJobAsync(c);
searchJobAsync.execute();
}
}
尝试交换此行
searchJobAsync.execute ();
searchJobAsync = new SearchJobAsync (c, data, this);
更新后的问题:
我确信SearchJobsFragment会导致错误。
原因有二:
你不能跑
searchJobAsync.execute ();
searchJobAsync = new SearchJobAsync (c, data, this);
按此顺序,它会导致execute方法中出现空指针异常。所以,我认为SearchJobList类从未在您的项目中使用过
2我使用具有类似行为的SearchJobAsync和ListFragment类构建了一个小型测试项目,并且工作正常。所以,SearchJobsFragment中的问题
您需要从onClick方法调用SearchJobAsync(上下文、ArrayList、getArrayList)构造函数。否则,SearchJobAsync中的列表变量将保持null并导致异常。问题:
implements SearchJobAsync.getArrayList
if (values.size () > 0) {
if(list != null)
list.getList (values);
}
您正试图调用另一个非静态类上的接口,因此编译器在找到它时遇到了一些问题
解决方案:
implements SearchJobAsync.getArrayList
if (values.size () > 0) {
if(list != null)
list.getList (values);
}
使您的getArrayList
成为静态界面
static interface getArrayList {
public void getList(ArrayList<SearchModel> data);
}
主席先生,错误与我刚才所说的相同above@Anuj是的,你提到了,但我们需要日志,所以我们知道什么是problem@Anuj您是在某些类中有多个SearchJobAsync,还是仅在ListFragment中有多个?我在其他类中调用了SearchJobAsync.executeActivity@Anuj我建议把你的界面作为一个单独的类,请发布代码其他名为SearchJobAsync的活动
static interface getArrayList {
public void getList(ArrayList<SearchModel> data);
}
if (values.size () > 0) {
if(list != null)
list.getList (values);
}