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POhas stopped , window leaked , zygoteInit
 

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    <p>I'm working on android to create a list to add tasks , there are many error when I run it and the emulator started. I tried hard to solve them but I couldn't and I think the problem in one class which is the main it supposed to display all tasks </p> <p>here is the log cat</p> <pre><code>04-08 08:53:43.334: E/Trace(637): error opening trace file: No such file or directory (2) 04-08 08:53:45.043: I/Choreographer(637): Skipped 54 frames! The application may be doing too much work on its main thread. 04-08 08:53:45.144: D/gralloc_goldfish(637): Emulator without GPU emulation detected. 04-08 08:53:45.479: I/Choreographer(637): Skipped 35 frames! The application may be doing too much work on its main thread. 04-08 08:53:46.067: I/Choreographer(637): Skipped 56 frames! The application may be doing too much work on its main thread. 04-08 08:53:46.713: D/dalvikvm(637): GC_CONCURRENT freed 132K, 2% free 9089K/9268K, paused 9ms+3ms, total 102ms 04-08 08:53:46.803: E/JSON Parser(637): Error parsing data org.json.JSONException: Value &lt;br of type java.lang.String cannot be converted to JSONObject 04-08 08:53:46.843: W/dalvikvm(637): threadid=11: thread exiting with uncaught exception (group=0x2bd39930) 04-08 08:53:46.903: E/AndroidRuntime(637): FATAL EXCEPTION: AsyncTask #1 04-08 08:53:46.903: E/AndroidRuntime(637): java.lang.RuntimeException: An error occured while executing doInBackground() 04-08 08:53:46.903: E/AndroidRuntime(637): at android.os.AsyncTask$3.done(AsyncTask.java:299) 04-08 08:53:46.903: E/AndroidRuntime(637): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352) 04-08 08:53:46.903: E/AndroidRuntime(637): at java.util.concurrent.FutureTask.setException(FutureTask.java:219) 04-08 08:53:46.903: E/AndroidRuntime(637): at java.util.concurrent.FutureTask.run(FutureTask.java:239) 04-08 08:53:46.903: E/AndroidRuntime(637): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) 04-08 08:53:46.903: E/AndroidRuntime(637): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573) 04-08 08:53:46.903: E/AndroidRuntime(637): at java.lang.Thread.run(Thread.java:856) 04-08 08:53:46.903: E/AndroidRuntime(637): Caused by: java.lang.NullPointerException 04-08 08:53:46.903: E/AndroidRuntime(637): at com.example.checklist.MainTask$LoadAllTasks.doInBackground(MainTask.java:172) 04-08 08:53:46.903: E/AndroidRuntime(637): at com.example.checklist.MainTask$LoadAllTasks.doInBackground(MainTask.java:1) 04-08 08:53:46.903: E/AndroidRuntime(637): at android.os.AsyncTask$2.call(AsyncTask.java:287) 04-08 08:53:46.903: E/AndroidRuntime(637): at java.util.concurrent.FutureTask.run(FutureTask.java:234) 04-08 08:53:46.903: E/AndroidRuntime(637): ... 3 more 04-08 08:53:51.744: E/WindowManager(637): Activity com.example.checklist.MainTask has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{2c607c90 V.E..... R.....ID 0,0-684,192} that was originally added here 04-08 08:53:51.744: E/WindowManager(637): android.view.WindowLeaked: Activity com.example.checklist.MainTask has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{2c607c90 V.E..... R.....ID 0,0-684,192} that was originally added here 04-08 08:53:51.744: E/WindowManager(637): at android.view.ViewRootImpl.&lt;init&gt;(ViewRootImpl.java:354) 04-08 08:53:51.744: E/WindowManager(637): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216) 04-08 08:53:51.744: E/WindowManager(637): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) 04-08 08:53:51.744: E/WindowManager(637): at android.app.Dialog.show(Dialog.java:281) 04-08 08:53:51.744: E/WindowManager(637): at com.example.checklist.MainTask$LoadAllTasks.onPreExecute(MainTask.java:155) 04-08 08:53:51.744: E/WindowManager(637): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586) 04-08 08:53:51.744: E/WindowManager(637): at android.os.AsyncTask.execute(AsyncTask.java:534) 04-08 08:53:51.744: E/WindowManager(637): at com.example.checklist.MainTask.onCreate(MainTask.java:79) 04-08 08:53:51.744: E/WindowManager(637): at android.app.Activity.performCreate(Activity.java:5104) 04-08 08:53:51.744: E/WindowManager(637): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 04-08 08:53:51.744: E/WindowManager(637): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 04-08 08:53:51.744: E/WindowManager(637): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 04-08 08:53:51.744: E/WindowManager(637): at android.app.ActivityThread.access$600(ActivityThread.java:141) 04-08 08:53:51.744: E/WindowManager(637): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 04-08 08:53:51.744: E/WindowManager(637): at android.os.Handler.dispatchMessage(Handler.java:99) 04-08 08:53:51.744: E/WindowManager(637): at android.os.Looper.loop(Looper.java:137) 04-08 08:53:51.744: E/WindowManager(637): at android.app.ActivityThread.main(ActivityThread.java:5039) 04-08 08:53:51.744: E/WindowManager(637): at java.lang.reflect.Method.invokeNative(Native Method) 04-08 08:53:51.744: E/WindowManager(637): at java.lang.reflect.Method.invoke(Method.java:511) 04-08 08:53:51.744: E/WindowManager(637): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 04-08 08:53:51.744: E/WindowManager(637): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 04-08 08:53:51.744: E/WindowManager(637): at dalvik.system.NativeStart.main(Native Method) 04-08 08:53:51.744: I/Choreographer(637): Skipped 49 frames! The application may be doing too much work on its main thread. 04-08 08:53:57.493: I/Process(637): Sending signal. PID: 637 SIG: 9 </code></pre>
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    1. COThe code in this is very similar to http://stackoverflow.com/questions/13295875/start-activity-in-doinbackground-method Consider adding a comment to that
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    2. COCaused by: java.lang.NullPointerException at line number 172. What is that line?
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    3. COGood way to avoid NullPointer exception would be Check that object is null or not. then do getter or setter operation. some this like this if (object!= null) { //do something with that object }. this way you can avoid crashing due to null pointer exception.
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