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我有一个 AsyncTask
,我想在其中每 3 秒测试一次条件。
当我调用其中的Thread.sleep(int)
方法时,我得到Can't create handler inside thread that has not called Looper.prepare()
错误。
下面是我的代码:
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
new AsyncTask<Void, Void, Void>()
{
ProgressDialog progressDialog;
@Override
protected void onPreExecute()
{
progressDialog = ProgressDialog.show(getActivity(), null, "Loading Categories...");
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... voids)
{
// TODO Auto-generated method stub
while(mOnlinCouponCategoriesManager.isDownloading())
{
try
{
Thread.sleep(3000);
}
catch(Exception e)
{
Log.e("Categories Section:", e.getMessage());
}
}
if(categoryAdapter == null)
{
categoryAdapter = new CategoryAdapter(getActivity(), R.layout.fragment_categorylist, mOnlineCategoriesCursor, new String[] {}, new int[] {});
setListAdapter(categoryAdapter);
}
else
{
setListAdapter(categoryAdapter);
}
return null;
}
}.execute();
View view = inflater.inflate(R.layout.custom_list, null);
return view;
}
这是我的堆栈跟踪
01-15 16:23:38.233: E/AndroidRuntime(31508): FATAL EXCEPTION: AsyncTask #1
01-15 16:23:38.233: E/AndroidRuntime(31508): Process: in.coupondunia.androidapp, PID: 31508
01-15 16:23:38.233: E/AndroidRuntime(31508): java.lang.RuntimeException: An error occured while executing doInBackground()
01-15 16:23:38.233: E/AndroidRuntime(31508): at android.os.AsyncTask$3.done(AsyncTask.java:300)
01-15 16:23:38.233: E/AndroidRuntime(31508): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
01-15 16:23:38.233: E/AndroidRuntime(31508): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
01-15 16:23:38.233: E/AndroidRuntime(31508): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
01-15 16:23:38.233: E/AndroidRuntime(31508): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
01-15 16:23:38.233: E/AndroidRuntime(31508): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
01-15 16:23:38.233: E/AndroidRuntime(31508): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
01-15 16:23:38.233: E/AndroidRuntime(31508): at java.lang.Thread.run(Thread.java:841)
01-15 16:23:38.233: E/AndroidRuntime(31508): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
01-15 16:23:38.233: E/AndroidRuntime(31508): at android.os.Handler.<init>(Handler.java:200)
01-15 16:23:38.233: E/AndroidRuntime(31508): at android.os.Handler.<init>(Handler.java:114)
01-15 16:23:38.233: E/AndroidRuntime(31508): at android.support.v4.widget.CursorAdapter$ChangeObserver.<init>(CursorAdapter.java:455)
01-15 16:23:38.233: E/AndroidRuntime(31508): at android.support.v4.widget.CursorAdapter.init(CursorAdapter.java:176)
01-15 16:23:38.233: E/AndroidRuntime(31508): at android.support.v4.widget.CursorAdapter.<init>(CursorAdapter.java:122)
01-15 16:23:38.233: E/AndroidRuntime(31508): at android.support.v4.widget.ResourceCursorAdapter.<init>(ResourceCursorAdapter.java:54)
01-15 16:23:38.233: E/AndroidRuntime(31508): at android.support.v4.widget.SimpleCursorAdapter.<init>(SimpleCursorAdapter.java:63)
01-15 16:23:38.233: E/AndroidRuntime(31508): at in.coupondunia.androidapp.adapters.CategoryAdapter.<init>(CategoryAdapter.java:27)
01-15 16:23:38.233: E/AndroidRuntime(31508): at in.coupondunia.androidapp.fragments.online.OnlineCategoriesFragment$1.doInBackground(OnlineCategoriesFragment.java:80)
01-15 16:23:38.233: E/AndroidRuntime(31508): at in.coupondunia.androidapp.fragments.online.OnlineCategoriesFragment$1.doInBackground(OnlineCategoriesFragment.java:1)
01-15 16:23:38.233: E/AndroidRuntime(31508): at android.os.AsyncTask$2.call(AsyncTask.java:288)
01-15 16:23:38.233: E/AndroidRuntime(31508): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
01-15 16:23:38.233: E/AndroidRuntime(31508): ... 4 more
01-15 16:23:39.434: E/WindowManager(31508): android.view.WindowLeaked: Activity in.coupondunia.androidapp.HomeActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{42843b18 V.E..... R......D 0,0-729,192} that was originally added here
01-15 16:23:39.434: E/WindowManager(31508): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:348)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
01-15 16:23:39.434: E/WindowManager(31508): at android.app.Dialog.show(Dialog.java:286)
01-15 16:23:39.434: E/WindowManager(31508): at android.app.ProgressDialog.show(ProgressDialog.java:116)
01-15 16:23:39.434: E/WindowManager(31508): at android.app.ProgressDialog.show(ProgressDialog.java:99)
01-15 16:23:39.434: E/WindowManager(31508): at android.app.ProgressDialog.show(ProgressDialog.java:94)
01-15 16:23:39.434: E/WindowManager(31508): at in.coupondunia.androidapp.fragments.online.OnlineCategoriesFragment$1.onPreExecute(OnlineCategoriesFragment.java:59)
01-15 16:23:39.434: E/WindowManager(31508): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
01-15 16:23:39.434: E/WindowManager(31508): at android.os.AsyncTask.execute(AsyncTask.java:535)
01-15 16:23:39.434: E/WindowManager(31508): at in.coupondunia.androidapp.fragments.online.OnlineCategoriesFragment.onCreateView(OnlineCategoriesFragment.java:90)
01-15 16:23:39.434: E/WindowManager(31508): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
01-15 16:23:39.434: E/WindowManager(31508): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
01-15 16:23:39.434: E/WindowManager(31508): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
01-15 16:23:39.434: E/WindowManager(31508): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
01-15 16:23:39.434: E/WindowManager(31508): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
01-15 16:23:39.434: E/WindowManager(31508): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:472)
01-15 16:23:39.434: E/WindowManager(31508): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
01-15 16:23:39.434: E/WindowManager(31508): at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
01-15 16:23:39.434: E/WindowManager(31508): at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
01-15 16:23:39.434: E/WindowManager(31508): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.View.measure(View.java:16497)
01-15 16:23:39.434: E/WindowManager(31508): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:719)
01-15 16:23:39.434: E/WindowManager(31508): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:455)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.View.measure(View.java:16497)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
01-15 16:23:39.434: E/WindowManager(31508): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.View.measure(View.java:16497)
01-15 16:23:39.434: E/WindowManager(31508): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:719)
01-15 16:23:39.434: E/WindowManager(31508): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:455)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.View.measure(View.java:16497)
01-15 16:23:39.434: E/WindowManager(31508): at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:651)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.View.measure(View.java:16497)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
01-15 16:23:39.434: E/WindowManager(31508): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.View.measure(View.java:16497)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
01-15 16:23:39.434: E/WindowManager(31508): at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.View.measure(View.java:16497)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
01-15 16:23:39.434: E/WindowManager(31508): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-15 16:23:39.434: E/WindowManager(31508): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2291)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.View.measure(View.java:16497)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1916)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1113)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1295)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5670)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.Choreographer.doCallbacks(Choreographer.java:574)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.Choreographer.doFrame(Choreographer.java:544)
01-15 16:23:39.434: E/WindowManager(31508): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
01-15 16:23:39.434: E/WindowManager(31508): at android.os.Handler.handleCallback(Handler.java:733)
01-15 16:23:39.434: E/WindowManager(31508): at android.os.Handler.dispatchMessage(Handler.java:95)
01-15 16:23:39.434: E/WindowManager(31508): at android.os.Looper.loop(Looper.java:136)
01-15 16:23:39.434: E/WindowManager(31508): at android.app.ActivityTh
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