android Cannot execute task: the task has already been executed (a task can be executed only once)

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遇到如下异常是因为AsyncTask线程只能运行一次，而你当前却在多次运行某个AsyncTask线程

E AndroidRuntime: FATAL EXCEPTION: main

E AndroidRuntime: Process: com.android.settings, PID: 7311
E AndroidRuntime: java.lang.RuntimeException: Unable to resume activity {com.android.settings/com.android.settings.applications.InstalledAppDetails}: java.lang.IllegalStateException: Cannot execute task: the task has already been executed (a task can be executed only once)
E AndroidRuntime: at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3121)
E AndroidRuntime: at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3152)
E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1391)
E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)
E AndroidRuntime: at android.os.Looper.loop(Looper.java:148)
E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5451)
E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
E AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
E AndroidRuntime: Caused by: java.lang.IllegalStateException: Cannot execute task: the task has already been executed (a task can be executed only once)
E AndroidRuntime: at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:596)
E AndroidRuntime: at android.os.AsyncTask.execute(AsyncTask.java:551)
E AndroidRuntime: at com.android.settings.applications.InstalledAppDetails.onResume(InstalledAppDetails.java:326)
E AndroidRuntime: at android.app.Fragment.performResume(Fragment.java:2263)
E AndroidRuntime: at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1008)
E AndroidRuntime: at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1148)
E AndroidRuntime: at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1130)
E AndroidRuntime: at android.app.FragmentManagerImpl.dispatchResume(FragmentManager.java:1963)
E AndroidRuntime: at android.app.FragmentController.dispatchResume(FragmentController.java:174)
E AndroidRuntime: at android.app.Activity.performResume(Activity.java:6420)
E AndroidRuntime: at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3110)
E AndroidRuntime: ... 8 more
E JavaBinder: !!! FAILED BINDER TRANSACTION !!! (parcel size = 208)

E IzatSvc_OSObserver: I/LocTech-Label :: OSOBSERVER :: Data Items In

解决该问题AsyncTask的正确执行方法是：

new ToggleProtectedAppComponents().execute();

不能：

ToggleProtectedAppComponents xxxx;

if( xxxx == null){

xxxx = new ToggleProtectedAppComponents();

}

xxxx.execute();

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