我创建了一个执行所有后台任务的异步任务。在异步任务类中，我已经创建了一个方法完成的接口。它用于让我知道后台任务已经结束。但是当我使用时那个界面我得到它
异步类
public static class SearchJobsAsync extends AsyncTask<String, String, String> {
String response;
boolean value;
Context c;
finished finished;
public SearchJobsAsync(Context c, SearchJobsAsync.finished finished,boolean value) {
this.c = c;
this.finished = finished;
this.value=value;
}
public static interface finished {
void Finish(boolean finish);
}
SearchJobsAsync(Context c, boolean value) {
this.value = value;
this.c = c;
}
@Override
protected String doInBackground(String... strings) {
if (spYears.getSelectedItemPosition () == 0 && spMonths.getSelectedItemPosition () == 0 && spToYears.getSelectedItemPosition () == 0 && spToMonths.getSelectedItemPosition () == 0) {
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=" + strCategory + "&Exp_Years_From=0" + "&Exp_Months_From=0" + "&Exp_Years_To=99" + "&Exp_Months_To=99").body ();
} else if (spYears.getSelectedItemPosition () == 0) {
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=" + strCategory + "&Exp_Years_From=0" + "&Exp_Months_From=" + strMnths + "&Exp_Years_To=" + strToYrs + "&Exp_Months_To=" + strToMnths).body ();
} else if (spMonths.getSelectedItemPosition () == 0) {
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=" + strCategory + "&Exp_Years_From=" + strYrs + "&Exp_Months_From=0" + "&Exp_Years_To=" + strToYrs + "&Exp_Months_To=" + strToMnths).body ();
} else if (spYears.getSelectedItemPosition () == 0 && spMonths.getSelectedItemPosition () == 0) {
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=" + strCategory + "&Exp_Years_From=0" + "&Exp_Months_From=0" + "&Exp_Years_To=" + strToYrs + "&Exp_Months_To=" + strToMnths).body ();
} else if (spToYears.getSelectedItemPosition () == 0) {
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=" + strCategory + "&Exp_Years_From=" + strYrs + "&Exp_Months_From=" + strMnths + "&Exp_Years_To=25" + "&Exp_Months_To=" + strToMnths).body ();
} else if (spToMonths.getSelectedItemPosition () == 0) {
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=" + strCategory + "&Exp_Years_From=" + strYrs + "&Exp_Months_From=" + strMnths + "&Exp_Years_To=" + strToYrs + "&Exp_Months_To=25").body ();
} else if (spToYears.getSelectedItemPosition () == 0 && spToMonths.getSelectedItemPosition () == 0) {
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=" + strCategory + "&Exp_Years_From=" + strYrs + "&Exp_Months_From=" + strMnths + "&Exp_Years_To=25" + "&Exp_Months_To=25").body ();
} else if (spYears.getSelectedItemPosition () == 0 && spMonths.getSelectedItemPosition () == 0 && spToYears.getSelectedItemPosition () == 0 && spToMonths.getSelectedItemPosition () == 0) {
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=" + strCategory + "&Exp_Years_From=0" + "&Exp_Months_From=0" + "&Exp_Years_To=25" + "&Exp_Months_To=25").body ();
} else {
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=" + strCategory + "&Exp_Years_From=" + strYrs + "&Exp_Months_From=" + strMnths + "&Exp_Years_To=" + strToYrs + "&Exp_Months_To=" + strToMnths).body ();
}
//Vendor_IEntity_Code=string&Job_Code=string&Job_Category=string&Exp_Years_From=string&Exp_Months_From=string&Exp_Years_To=string&Exp_Months_To=string
response = response.replaceAll ("<[^>]*>", "").replaceAll ("\n", "");
Log.e (" Search Job Response", "" + response);
return response;
}
@Override
protected void onPreExecute() {
super.onPreExecute ();
// CommonFunctions cs = new CommonFunctions ();
// cs.showProgressBar (c, true);
pDialog = new ProgressDialog (c);
pDialog.setMessage ("Please wait...");
pDialog.setCancelable (false);
pDialog.show ();
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute (s);
arraylist = new ArrayList<HashMap<String, String>> ();
try {
jsonObject = new JSONObject (s);
NewDataSet = jsonObject.getJSONObject ("NewDataSet");
if (NewDataSet == null) {
Toast.makeText (c, "error", Toast.LENGTH_SHORT).show ();
} else if (NewDataSet.get ("Table") instanceof JSONObject) {
HashMap<String, String> map = new HashMap<String, String> ();
JSONObject table = NewDataSet.getJSONObject ("Table");
map.put ("category", table.getString ("Job_Category"));
map.put ("minExp", table.getString ("Min_Exp"));
map.put ("maxExp", table.getString ("Max_Exp"));
map.put ("postedOn", table.getString ("Posted_On"));
map.put ("counts", table.getString ("Candidate_Counts"));
map.put ("applied", table.getString ("Applications"));
map.put ("position", table.getString ("No_Of_Pos"));
map.put ("desc", table.getString ("Job_Desc"));
map.put ("type", table.getString ("Job_Type"));
map.put ("hours", table.getString ("Job_Hours"));
map.put ("status", table.getString ("Job_Status"));
map.put ("expiryDate", table.getString ("Job_Exp_Date"));
map.put ("address", table.getString ("Address"));
map.put ("state", table.getString ("Job_State"));
map.put ("country", table.getString ("Job_Country"));
map.put ("city", table.getString ("Job_City"));
map.put ("gender", table.getString ("Gender_Name"));
map.put ("religion", table.getString ("Religion_Name"));
map.put ("summary", table.getString ("Exp_Summary"));
map.put ("requestId", table.getString ("IJob_Request_ID"));
map.put ("requestorName", table.getString ("Requestor_Name"));
// map.put ("requestId",table.getString ("IJob_Request_ID"));
arraylist.add (map);
} else if (NewDataSet.get ("Table") instanceof JSONArray) {
JSONArray tablearray = NewDataSet.getJSONArray ("Table");
for (int i = 0; i < tablearray.length (); i++) {
HashMap<String, String> map = new HashMap<String, String> ();
JSONObject table = tablearray.getJSONObject (i);
map.put ("code", table.getString ("Job_Code"));
map.put ("category", table.getString ("Job_Category"));
map.put ("minExp", table.getString ("Min_Exp"));
map.put ("maxExp", table.getString ("Max_Exp"));
map.put ("postedOn", table.getString ("Posted_On"));
map.put ("counts", table.getString ("Candidate_Counts"));
map.put ("applied", table.getString ("Applications"));
map.put ("position", table.getString ("No_Of_Pos"));
map.put ("desc", table.getString ("Job_Desc"));
map.put ("type", table.getString ("Job_Type"));
map.put ("hours", table.getString ("Job_Hours"));
map.put ("status", table.getString ("Job_Status"));
map.put ("expiryDate", table.getString ("Job_Exp_Date"));
map.put ("address", table.getString ("Address"));
map.put ("state", table.getString ("Job_State"));
map.put ("country", table.getString ("Job_Country"));
map.put ("city", table.getString ("Job_City"));
map.put ("gender", table.getString ("Gender_Name"));
map.put ("religion", table.getString ("Religion_Name"));
map.put ("summary", table.getString ("Exp_Summary"));
map.put ("requestId", table.getString ("IJob_Request_ID"));
map.put ("requestorName", table.getString ("Requestor_Name"));
arraylist.add (map);
// add.add (values);
}
}
} catch (JSONException e) {
e.printStackTrace ();
}
if (value) {
finished.Finish (true);
Intent i = new Intent (c, SearchJobsList.class);
c.startActivity (i);
}
if (pDialog.isShowing ()) {
pDialog.dismiss ();
}
}
}
@Override
public void onBackPressed() {
super.onBackPressed ();
Intent i = new Intent (c, Home.class);
startActivity (i);
}
}
logcat的
06-27 17:14:30.406 11554-11554/com.example.jobs_on_call.app E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.example.jobs_on_call_search_jobs.SearchJobs$SearchJobsAsync.onPostExecute(SearchJobs.java:334)
at com.example.jobs_on_call_search_jobs.SearchJobs$SearchJobsAsync.onPostExecute(SearchJobs.java:160)
at android.os.AsyncTask.finish(AsyncTask.java:631)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:213)
at android.app.ActivityThread.main(ActivityThread.java:4787)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
//尝试以下代码。只做一个构造函数。
//接口代码是：
public interface WebServiceListener {
// what ever you want to use arraylist or map.
public void onActionComplete (ArrayList<String> _arraList);
public void onActionCompletes (HashMap<String, String> _map);
}
//你的异步类
public class SearchJobsAsync extends AsyncTask<String, String, String> {
WebServiceListener _object = null;
Context _CTX;
public SearchJobsAsync(Context _ctx,WebServiceListener object) {
this._CTX = _ctx;
this._object = object;
}
@Override
protected String doInBackground(String... params) {
String _data = null;
try {
// do your stuff
} catch (Exception e) {
e.printStackTrace();
}
return _data;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
HashMap<String, String> map = new HashMap<String,String>();
map.put("KEY", result);
object.onActionCompletes(map);
_arraylist.add(result);
object.onActionComplete(_arraylist);
}
}
//现在在你想要数据的yiour主活动中，只需创建Async类的对象并传递如下参数：
SearchJobsAsync _parse = new SearchJobsAsync(_ctx,this);
//现在补充接口的方法并获取如下数据：
@Override
public void onActionComplete(ArrayList<String> _array) {
String _mydata = _array.get(0);
System.out.println("hhhh" + _mydata);
}
@Override
public void onActionCompletes(HashMap<String, String> _map) {
String _mydatas = _map.get("pankaj");
System.out.println("thakur shab" + _mydatas);
}