JSON解析问题未解决[关闭]

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 getTaskDetail 类的 Preexecute 对话框中的 dialog.show(); 上遇到错误。并在 Log.d("Single Task Details", json.toString()); 上显示错误，并在 new GetTaskDetails().execute(); 上显示错误

请指导为什么它没有从我的 php 应用程序数据库中获取值。它通过生成“强制关闭”错误意外停止。请指导我哪里出错了。我想使用 JSONParsing 从 MySql 获取数据到 android

Answer 1

我认为是您的 JSON 有问题导致窗口泄漏：

Error parsing data org.json.JSONException: End of input at character 0 of

您能否发布 JSON（通过在浏览器或 CURL 中打开 url 并复制内容）。 JSON 似乎无效。

Answer 2

我认为您在模拟器中运行时出现的 url 问题将 url 更改为

这个

private static final String url_read_mytask = "http://10.0.2.2/evisiting_records/read_mytask.php";

和

private static final String url_update_mytask = "http://10.0.2.2/evisiting_records/update_mytask.php"

Answer 3

你尝试从后台线程与 ui 线程交互时，它接缝的 json 没有问题。 看一下： Activity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@46368a28 that was originally added here