已經停止，窗口泄漏，zygoteInit

Question

我正在android上創建一個列表來添加任務，當我運行它並且模擬器啓動時有很多錯誤。我努力解決這些問題，但我做不到，我認爲這是主要的它應該顯示所有任務

在這裏一類問題是日誌貓

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 <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$DecorView{2c607c90 V.E..... R.....ID 0,0-684,192} that was originally added here 
04-08 08:53:51.744: E/WindowManager(637): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354) 
04-08 08:53:51.744: E/WindowManager(637): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216) 
04-08 08:53:51.744: E/WindowManager(637): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) 
04-08 08:53:51.744: E/WindowManager(637): at android.app.Dialog.show(Dialog.java:281) 
04-08 08:53:51.744: E/WindowManager(637): at com.example.checklist.MainTask$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 

Answer 1

考慮到你的日誌顯示JSON解析錯誤後跟一個NPE，我的猜測是，這個問題在這裏發生：

// getting JSON string from URL 
JSONObject json = jParser.makeHttpRequest(url_all_tasks, "GET", params); 

// Check your log cat for JSON reponse 
Log.d("All Tasks: ", json.toString()); 

貌似解析器失敗，只是返回null爲json，然後調用json.toString()失敗的NPE。

此外，您應該更改您的AsyncTask代碼作爲由Sunil Havnur給出的評論。