AsyncTask中的Android NetworkOnMainThreadException(Android NetworkOnMainThreadException inside of Async

AsyncTask中的Android NetworkOnMainThreadException(Android NetworkOnMainThreadException inside of AsyncTask)

当我尝试使用谷歌日历api时，我在ICS上遇到了问题。要获取事件列表，我有一个AsyncTask，并在doInBackground（）内部进行服务调用但仍然收到NetworkOnMainThreadException错误。

这是我的代码：

我这样称我的AsyncTask：

new GoogleCalendarEvents().execute(new Object());

我的AsyncTask看起来像这样：

private class GoogleCalendarEvents extends AsyncTask<Object, Object, Object> { @Override protected Object doInBackground(Object... objects) { OAuthManager manager = OAuthManager.getInstance(); /* login to google api and get the auth token */ manager.doLogin("", true, mActivity, new OAuthManager.AuthHandler() { @Override public void handleAuth(Account account, String authToken) { if (account != null) { /* create a google Calendar service if the returned account is not null */ com.google.api.services.calendar.Calendar service = CalendarServiceBuilder.build(OAuthManager.getInstance().getAuthToken()); try { /* get the list of events for the primary calendar */ /* ---------HERE THE APP IS CRUSHING --------- */ mEvents = service.events().list(mCalendarId).execute(); while (true) { /* get the next page token if any */ String pageToken = mEvents.getNextPageToken(); if (pageToken != null && !pageToken.equals("")) { /* if there are other pages, get the next page */ Events newPageEvents = service.events().list(mCalendarId) .setPageToken(pageToken).execute(); for (Event event : newPageEvents.getItems()) { /* loop through all the events and add them into the mEvents */ mEvents.put(event.getId(), event); } } else { break; } } /* make sure we wont have memory leaks */ mActivity = null; /* notify the caller that the calendar events are ready */ mEventsReceiverCallback.calendarEventsReceived(true); mEventsReceiverCallback = null; } catch (IOException e) { /* let the user know that the event could not be created */ Utility.showInformationDialog(mActivity, mActivity.getString(R.string.error), mActivity.getString(R.string.error_message_bad_request_get_events)); /* make sure we wont have memory leaks */ mActivity = null; /* print the error into the log */ e.printStackTrace(); /* notify the caller that the manager could not get the calendar events */ mEventsReceiverCallback.calendarEventsReceived(false); mEventsReceiverCallback = null; } } else { /* le the user know that the event could not be created */ Utility.showInformationDialog(mActivity, mActivity.getString(R.string.error), mActivity.getString(R.string.error_message_connection)); /* make sure we wont have memory leaks */ mActivity = null; /* notify the caller that the manager could not get the calendar events */ mEventsReceiverCallback.calendarEventsReceived(false); mEventsReceiverCallback = null; } } }); return null; } }

和日志：

02-22 10:32:08.597: ERROR/AndroidRuntime(13924): FATAL EXCEPTION: main android.os.NetworkOnMainThreadException at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099) at java.net.InetAddress.lookupHostByName(InetAddress.java:391) at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242) at java.net.InetAddress.getAllByName(InetAddress.java:220) at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) at com.google.api.client.http.apache.ApacheHttpRequest.execute(ApacheHttpRequest.java:58) at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:639) at com.google.api.client.http.json.JsonHttpClient.execute(JsonHttpClient.java:257) at com.google.api.client.googleapis.services.GoogleClient.execute(GoogleClient.java:121) at com.google.api.client.http.json.JsonHttpRequest.executeUnparsed(JsonHttpRequest.java:67) at com.google.api.services.calendar.Calendar$Events$List.execute(Calendar.java:2643) at /* here is the error, I think */com.google.calendar.manager.business.CalendarEventProvider$GoogleCalendarEvents$1.handleAuth(CalendarEventProvider.java:118) at com.google.calendar.manager.utils.OAuthManager$1.run(OAuthManager.java:194) at android.accounts.AccountManager$10.run(AccountManager.java:1264) at android.os.Handler.handleCallback(Handler.java:605) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4424) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) at dalvik.system.NativeStart.main(Native Method)

这里说我必须使用AndroidHttp.newCompatibleTransport（）作为传输类，我在CalendarServiceBuilder中使用它。

什么可能导致此错误以及如何解决问题？

谢谢！

I have a problem on ICS when I try to use google calendar api. To get a list of events, I have a AsyncTask and inside doInBackground() I make the service calls but still I receive the NetworkOnMainThreadException error.

Here is my code:

I call my AsyncTask like this:

new GoogleCalendarEvents().execute(new Object());

And my AsyncTask looks like this:

private class GoogleCalendarEvents extends AsyncTask<Object, Object, Object> { @Override protected Object doInBackground(Object... objects) { OAuthManager manager = OAuthManager.getInstance(); /* login to google api and get the auth token */ manager.doLogin("", true, mActivity, new OAuthManager.AuthHandler() { @Override public void handleAuth(Account account, String authToken) { if (account != null) { /* create a google Calendar service if the returned account is not null */ com.google.api.services.calendar.Calendar service = CalendarServiceBuilder.build(OAuthManager.getInstance().getAuthToken()); try { /* get the list of events for the primary calendar */ /* ---------HERE THE APP IS CRUSHING --------- */ mEvents = service.events().list(mCalendarId).execute(); while (true) { /* get the next page token if any */ String pageToken = mEvents.getNextPageToken(); if (pageToken != null && !pageToken.equals("")) { /* if there are other pages, get the next page */ Events newPageEvents = service.events().list(mCalendarId) .setPageToken(pageToken).execute(); for (Event event : newPageEvents.getItems()) { /* loop through all the events and add them into the mEvents */ mEvents.put(event.getId(), event); } } else { break; } } /* make sure we wont have memory leaks */ mActivity = null; /* notify the caller that the calendar events are ready */ mEventsReceiverCallback.calendarEventsReceived(true); mEventsReceiverCallback = null; } catch (IOException e) { /* let the user know that the event could not be created */ Utility.showInformationDialog(mActivity, mActivity.getString(R.string.error), mActivity.getString(R.string.error_message_bad_request_get_events)); /* make sure we wont have memory leaks */ mActivity = null; /* print the error into the log */ e.printStackTrace(); /* notify the caller that the manager could not get the calendar events */ mEventsReceiverCallback.calendarEventsReceived(false); mEventsReceiverCallback = null; } } else { /* le the user know that the event could not be created */ Utility.showInformationDialog(mActivity, mActivity.getString(R.string.error), mActivity.getString(R.string.error_message_connection)); /* make sure we wont have memory leaks */ mActivity = null; /* notify the caller that the manager could not get the calendar events */ mEventsReceiverCallback.calendarEventsReceived(false); mEventsReceiverCallback = null; } } }); return null; } }

And the log:

02-22 10:32:08.597: ERROR/AndroidRuntime(13924): FATAL EXCEPTION: main android.os.NetworkOnMainThreadException at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099) at java.net.InetAddress.lookupHostByName(InetAddress.java:391) at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242) at java.net.InetAddress.getAllByName(InetAddress.java:220) at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) at com.google.api.client.http.apache.ApacheHttpRequest.execute(ApacheHttpRequest.java:58) at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:639) at com.google.api.client.http.json.JsonHttpClient.execute(JsonHttpClient.java:257) at com.google.api.client.googleapis.services.GoogleClient.execute(GoogleClient.java:121) at com.google.api.client.http.json.JsonHttpRequest.executeUnparsed(JsonHttpRequest.java:67) at com.google.api.services.calendar.Calendar$Events$List.execute(Calendar.java:2643) at /* here is the error, I think */com.google.calendar.manager.business.CalendarEventProvider$GoogleCalendarEvents$1.handleAuth(CalendarEventProvider.java:118) at com.google.calendar.manager.utils.OAuthManager$1.run(OAuthManager.java:194) at android.accounts.AccountManager$10.run(AccountManager.java:1264) at android.os.Handler.handleCallback(Handler.java:605) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4424) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) at dalvik.system.NativeStart.main(Native Method)

Here says that I have to use AndroidHttp.newCompatibleTransport() as the transport class, and I do use it in my CalendarServiceBuilder.

What could cause this error and how I can solve the problem?

Thank you!