JSON解析问题未解决

Question

我的LogCat错误是:

    12-31 14:45:14.920: E/WindowManager(3420): Activity com.example.visit.record.My_Task has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4054ed00 that was originally added here
    12-31 14:45:14.920: E/WindowManager(3420): android.view.WindowLeaked: Activity com.example.visit.record.My_Task has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4054ed00 that was originally added here
    12-31 14:45:14.920: E/WindowManager(3420):  at android.view.ViewRoot.<init>(ViewRoot.java:277)
    12-31 14:45:14.920: E/WindowManager(3420):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
    12-31 14:45:14.920: E/WindowManager(3420):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
    12-31 14:45:14.920: E/WindowManager(3420):  at android.view.Window$LocalWindowManager.addView(Window.java:433)
    12-31 14:45:14.920: E/WindowManager(3420):  at android.app.Dialog.show(Dialog.java:288)
    12-31 14:45:14.920: E/WindowManager(3420):  at com.example.visit.record.My_Task$GetTaskDetails.onPreExecute(My_Task.java:137)
    12-31 14:45:14.920: E/WindowManager(3420):  at android.os.AsyncTask.execute(AsyncTask.java:391)
    12-31 14:45:14.920: E/WindowManager(3420):  at com.example.visit.record.My_Task.onCreate(My_Task.java:105)
    12-31 14:45:14.920: E/WindowManager(3420):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
    12-31 14:45:14.920: E/WindowManager(3420):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1785)
    12-31 14:45:14.920: E/WindowManager(3420):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1842)
    12-31 14:45:14.920: E/WindowManager(3420):  at android.app.ActivityThread.access$1500(ActivityThread.java:132)
    12-31 14:45:14.920: E/WindowManager(3420):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1038)
    12-31 14:45:14.920: E/WindowManager(3420):  at android.os.Handler.dispatchMessage(Handler.java:99)
    12-31 14:45:14.920: E/WindowManager(3420):  at android.os.Looper.loop(Looper.java:143)
    12-31 14:45:14.920: E/WindowManager(3420):  at android.app.ActivityThread.main(ActivityThread.java:4268)
    12-31 14:45:14.920: E/WindowManager(3420):  at java.lang.reflect.Method.invokeNative(Native Method)
    12-31 14:45:14.920: E/WindowManager(3420):  at java.lang.reflect.Method.invoke(Method.java:507)
    12-31 14:45:14.920: E/WindowManager(3420):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
    12-31 14:45:14.920: E/WindowManager(3420):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
    12-31 14:45:14.920: E/WindowManager(3420):  at dalvik.system.NativeStart.main(Native Method)
12-31 14:54:22.360: E/AndroidRuntime(4423):     at com.example.visit.record.My_Task$GetTaskDetails.doInBackground(My_Task.java:163)
12-31 15:10:51.470: W/System.err(6457):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
12-31 15:10:51.470: W/System.err(6457):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
12-31 15:10:51.470: W/System.err(6457):     at java.lang.Thread.run(Thread.java:1027)
12-31 15:10:51.480: E/Buffer Error(6457): Error converting result java.lang.NullPointerException
12-31 15:10:51.480: E/JSON Parser(6457): Error parsing data org.json.JSONException: End of input at character 0 of 
12-31 15:10:51.480: W/dalvikvm(6457): threadid=9: thread exiting with uncaught exception (group=0x400205a0)
12-31 15:10:51.490: E/AndroidRuntime(6457): FATAL EXCEPTION: AsyncTask #1
12-31 15:10:51.490: E/AndroidRuntime(6457): java.lang.RuntimeException: An error occured while executing doInBackground()
12-31 15:10:51.490: E/AndroidRuntime(6457):     at android.os.AsyncTask$3.done(AsyncTask.java:200)
12-31 15:10:51.490: E/AndroidRuntime(6457):     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
12-31 15:10:51.490: E/AndroidRuntime(6457):     at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
12-31 15:10:51.490: E/AndroidRuntime(6457):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
12-31 15:10:51.490: E/AndroidRuntime(6457):     at java.util.concurrent.FutureTask.run(FutureTask.java:138)
12-31 15:10:51.490: E/AndroidRuntime(6457):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)

我在dialog.show()上遇到错误; 在getTaskDetail类的Preexecute对话框中.并在Log.d上显示错误 ("Single Task Details",json.toString()); 并且在新的GetTaskDetails()上遇到错误 .execute();

请指导为什么它不从我的php应用程序数据库中获取值.并通过生成"强制关闭"错误意外停止.请指导哪里出错了.我想使用JSONParsing从MySql获取数据到android

Answer 1

它没有 json 的问题，它表明您尝试从后台线程与 ui 线程交互。看一下： Activity hasleaked window com.android.internal.policy.impl.PhoneWindow$DecorView@46368a28 最初是在此处添加的