我正在开发一个后台服务,在一段时间内对服务器进行轮询.关键是:我有一个调用另一个服务的IntentService(称为NotificationsService),但是这个请求的响应没有回来.并在logcat中出现:
06-19 05:12:00.151: W/MessageQueue(6436): Handler (android.os.Handler) {416659f0} sending message to a Handler on a dead thread
06-19 05:12:00.151: W/MessageQueue(6436): java.lang.RuntimeException: Handler (android.os.Handler) {416659f0} sending message to a Handler on a dead thread
06-19 05:12:00.151: W/MessageQueue(6436): at android.os.MessageQueue.enqueueMessage(MessageQueue.java:196)
06-19 05:12:00.151: W/MessageQueue(6436): at android.os.Handler.sendMessageAtTime(Handler.java:473)
06-19 05:12:00.151: W/MessageQueue(6436): at android.os.Handler.sendMessageDelayed(Handler.java:446)
06-19 05:12:00.151: W/MessageQueue(6436): at android.os.Handler.post(Handler.java:263)
06-19 05:12:00.151: W/MessageQueue(6436): at android.os.ResultReceiver$MyResultReceiver.send(ResultReceiver.java:50)
我在这里看到类似的问题,但我感到困惑(我没有使用任何AsyncTask,我已经找了CommonsWare代码wakefullIntent但我不理解它).
这是NotificationsService.java的代码
public class NotificationsService extends IntentService {
private static int TIME_INTERVAL_MILIS=90000;
private static final int REFRESH=10;
private NotificationManager noteManager;
private static List<FlightStatusNote> …我试图创建一个启动服务的活动(在新线程中).它包含一个带有两个editText和一个名为Send的按钮的布局.关键是当我执行MainActivity时,它会抛出:
06-15 22:32:13.312: E/AndroidRuntime(643): FATAL EXCEPTION: main
06-15 22:32:13.312: E/AndroidRuntime(643): java.lang.RuntimeException: Unable to instantiate service hikoki.services.NotificationsService: java.lang.NullPointerException
06-15 22:32:13.312: E/AndroidRuntime(643): at android.app.ActivityThread.handleCreateService(ActivityThread.java:2237)
06-15 22:32:13.312: E/AndroidRuntime(643): at android.app.ActivityThread.access$1600(ActivityThread.java:123)
06-15 22:32:13.312: E/AndroidRuntime(643): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1201)
06-15 22:32:13.312: E/AndroidRuntime(643): at android.os.Handler.dispatchMessage(Handler.java:99)
06-15 22:32:13.312: E/AndroidRuntime(643): at android.os.Looper.loop(Looper.java:137)
06-15 22:32:13.312: E/AndroidRuntime(643): at android.app.ActivityThread.main(ActivityThread.java:4424)
06-15 22:32:13.312: E/AndroidRuntime(643): at java.lang.reflect.Method.invokeNative(Native Method)
06-15 22:32:13.312: E/AndroidRuntime(643): at java.lang.reflect.Method.invoke(Method.java:511)
06-15 22:32:13.312: E/AndroidRuntime(643): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-15 22:32:13.312: E/AndroidRuntime(643): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-15 22:32:13.312: E/AndroidRuntime(643): at dalvik.system.NativeStart.main(Native Method)
06-15 22:32:13.312: E/AndroidRuntime(643): Caused by: java.lang.NullPointerException …