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POfatal exception : asynctask #1 doInBackground
 

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  1. POfatal exception : asynctask #1 doInBackground
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    <p>Im new to android programming and i cant pinpoint which triggers the error. i am having this errors:</p> <pre><code>10-29 02:34:17.989: E/AndroidRuntime(853): FATAL EXCEPTION: AsyncTask #1 10-29 02:34:17.989: E/AndroidRuntime(853): java.lang.RuntimeException: An error occured while executing doInBackground() 10-29 02:34:17.989: E/AndroidRuntime(853): at android.os.AsyncTask$3.done(AsyncTask.java:299) 10-29 02:34:17.989: E/AndroidRuntime(853): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352) 10-29 02:34:17.989: E/AndroidRuntime(853): at java.util.concurrent.FutureTask.setException(FutureTask.java:219) 10-29 02:34:17.989: E/AndroidRuntime(853): at java.util.concurrent.FutureTask.run(FutureTask.java:239) 10-29 02:34:17.989: E/AndroidRuntime(853): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 10-29 02:34:17.989: E/AndroidRuntime(853): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) 10-29 02:34:17.989: E/AndroidRuntime(853): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573) 10-29 02:34:17.989: E/AndroidRuntime(853): at java.lang.Thread.run(Thread.java:841) 10-29 02:34:17.989: E/AndroidRuntime(853): Caused by: java.lang.NullPointerException 10-29 02:34:17.989: E/AndroidRuntime(853): at com.agf.tripassigner.CreateTripActivity$CreateTrip.doInBackground(CreateTripActivity.java:104) 10-29 02:34:17.989: E/AndroidRuntime(853): at com.agf.tripassigner.CreateTripActivity$CreateTrip.doInBackground(CreateTripActivity.java:1) 10-29 02:34:17.989: E/AndroidRuntime(853): at android.os.AsyncTask$2.call(AsyncTask.java:287) 10-29 02:34:17.989: E/AndroidRuntime(853): at java.util.concurrent.FutureTask.run(FutureTask.java:234) 10-29 02:34:17.989: E/AndroidRuntime(853): ... 4 more 10-29 02:34:18.848: W/EGL_emulation(853): eglSurfaceAttrib not implemented 10-29 02:34:19.909: E/WindowManager(853): Activity com.agf.tripassigner.CreateTripActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{41844d20 V.E..... R......D 0,0-456,144} that was originally added here 10-29 02:34:19.909: E/WindowManager(853): android.view.WindowLeaked: Activity com.agf.tripassigner.CreateTripActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{41844d20 V.E..... R......D 0,0-456,144} that was originally added here 10-29 02:34:19.909: E/WindowManager(853): at android.view.ViewRootImpl.&lt;init&gt;(ViewRootImpl.java:345) 10-29 02:34:19.909: E/WindowManager(853): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:239) 10-29 02:34:19.909: E/WindowManager(853): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) 10-29 02:34:19.909: E/WindowManager(853): at android.app.Dialog.show(Dialog.java:281) 10-29 02:34:19.909: E/WindowManager(853): at com.agf.tripassigner.CreateTripActivity$CreateTrip.onPreExecute(CreateTripActivity.java:80) 10-29 02:34:19.909: E/WindowManager(853): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586) 10-29 02:34:19.909: E/WindowManager(853): at android.os.AsyncTask.execute(AsyncTask.java:534) 10-29 02:34:19.909: E/WindowManager(853): at com.agf.tripassigner.CreateTripActivity$1.onClick(CreateTripActivity.java:58) 10-29 02:34:19.909: E/WindowManager(853): at android.view.View.performClick(View.java:4240) 10-29 02:34:19.909: E/WindowManager(853): at android.view.View$PerformClick.run(View.java:17721) 10-29 02:34:19.909: E/WindowManager(853): at android.os.Handler.handleCallback(Handler.java:730) 10-29 02:34:19.909: E/WindowManager(853): at android.os.Handler.dispatchMessage(Handler.java:92) 10-29 02:34:19.909: E/WindowManager(853): at android.os.Looper.loop(Looper.java:137) 10-29 02:34:19.909: E/WindowManager(853): at android.app.ActivityThread.main(ActivityThread.java:5103) 10-29 02:34:19.909: E/WindowManager(853): at java.lang.reflect.Method.invokeNative(Native Method) 10-29 02:34:19.909: E/WindowManager(853): at java.lang.reflect.Method.invoke(Method.java:525) 10-29 02:34:19.909: E/WindowManager(853): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 10-29 02:34:19.909: E/WindowManager(853): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 10-29 02:34:19.909: E/WindowManager(853): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>and these are my codes in the class asynctask:</p> <pre><code>class CreateTrip extends AsyncTask&lt;String, String, String&gt; { /** * Before Sttarting Background thread Show Progress Dialog */ @Override protected void onPreExecute() { super.onPreExecute(); pDialog = new ProgressDialog(CreateTripActivity.this); pDialog.setMessage("Creating Trip..."); pDialog.setIndeterminate(false); pDialog.setCancelable(true); pDialog.show(); } /** * Creating Trip */ protected String doInBackground(String... args) { String plate = inputPlate.getText().toString(); String customer = inputCustomer.getText().toString(); String area = inputArea.getText().toString(); String driver = inputDriver.getText().toString(); //Building parameters List&lt;NameValuePair&gt; params = new ArrayList&lt;NameValuePair&gt;(); params.add(new BasicNameValuePair("plate", plate)); params.add(new BasicNameValuePair("customer", customer)); params.add(new BasicNameValuePair("area", area)); params.add(new BasicNameValuePair("driver", driver)); //getting JSON Object // Note that create trip url accepts post method JSONObject json = jsonParser.makeHttpRequest(url_create_trip, "POST", params); // check log cat for response Log.d("Create Response", json.toString()); // check for success tag try{ int success = json.getInt(TAG_SUCCESS); if (success == 1){ //successfully created trip Intent i = new Intent(getApplicationContext(), CreateTripActivity.class); startActivity(i); //closing this screen finish(); }else { // failed to create trip } } catch (JSONException e){ e.printStackTrace(); } return null; } /** * After Completing background task Dismiss the progress Dialog */ protected void onPostExecute(String file_url) { // dismiss the dialog once done pDialog.dismiss(); } } } </code></pre> <p>please help :((</p>
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    1. COwhat is line 104 `CreateTripActivity.java`?
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    2. COYou got NullPointerException here: Caused by: `java.lang.NullPointerException 10-29 02:34:17.989: E/AndroidRuntime(853): at com.agf.tripassigner.CreateTripActivity$CreateTrip.doInBackground(CreateTripActivity.java:104)`, Check you file at line 104, maybe some variables havent been initialised before using.
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    3. COYou are getting that WINDOW LEAKED error because you have to use .cancel() on dialog and not .dismiss()
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