START_STICKY,前台 Android 服务会在没有通知的情况下消失
问题说明
我在我的新应用程序中启动了一项服务.该服务是前台的,带有一个通知.当它在 AVD 2.1 API Level 7 中运行时,一切正常.但是当它在运行 Gingerbread 的三星 Galaxy Tab 上运行时,该服务将启动(图标和应用程序名称出现在通知区域的顶部),但几秒钟后,该服务消失.我可以看到的日志中的最后一个条目与我的应用程序相关联,是我的 Log.d("Taglines","Returning with " START_STICKY) 的结果,它紧跟在 "return START_STICKY ;" 之前在我的服务的 onStartCommand 覆盖中,如下所示:
I have started a service in my new application. The service is foregrounded, with a Notification. When this is run in the AVD 2.1 API Level 7, all works fine. But when it's run on a Samsung Galaxy Tab running Gingerbread, the service will start (the icon and app name appear at the top of the notification area), but after a few seconds, the service disappears. The last entry in the Log that I can see is associated with my App, is the result of my Log.d("Taglines","Returning with " START_STICKY), which immediately precedes "return START_STICKY ;" in my Service's onStartCommand override, as follows:
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
int rc ;
Log.d("Taglines","onStartCommand()");
Toast.makeText(this, "Starting service TagsManager", Toast.LENGTH_SHORT).show();
Log.d("Taglines","Calling super.onStartCommand()");
rc = super.onStartCommand(intent,flags,startId);
Log.d("Taglines","super.onStartCommand return code was " rc);
createNotification(INITIAL_NOTIFICATION_TEXT);
Log.d("Taglines","Returning with " START_STICKY);
return START_STICKY ;
}
通知设置如下:
void createNotification(String text) {
Log.d("Taglines","createNotification called");
if (mNotificationManager == null) {
// Get a reference to the Notification Manager
String ns = Context.NOTIFICATION_SERVICE;
mNotificationManager = (NotificationManager) getSystemService(ns);
Log.d("Taglines","Obtained reference to Notification Manager");
}
// Instantiate the Notification
int icon = R.drawable.ic_notification;
CharSequence tickerText = "Taglines";
long when = System.currentTimeMillis();
notification = new Notification(icon, tickerText, when);
// Define Notification's expanded message and intent
Log.d("Taglines","createNotificacion() .. getApplicationContext");
context = getApplicationContext();
contentText = text;
// notificationIntent = new Intent(this, TagsOverview.class);
notificationIntent = new Intent(this, TagsServiceMenu.class);
contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
// Pass the Notification to the NotificationManager:
Log.d("Taglines","createNotificacion() ... passing notification");
mNotificationManager.notify(NOTIFICATION_ID, notification);
Log.d("Taglines","Starting foreground");
startForeground(NOTIFICATION_ID, notification);
Log.d("Taglines","Started");
}
这是服务启动时adb logcat"的结果:
This is the result from "adb logcat" when the service is started:
D/Taglines(21863): Starting service
D/Taglines(21863): TagsManager(nullary) completed
D/Taglines(21863): onStartCommand()
D/Taglines(21863): Calling super.onStartCommand()
D/Taglines(21863): super.onStartCommand eturn code was 2
D/Taglines(21863): createNotification called
D/Taglines(21863): Obtained reference to Notification Manager
D/Taglines(21863): createNotificacion() .. getApplicationContext
D/Taglines(21863): createNotificacion() ... passing notification
D/Taglines(21863): Starting foreground
D/Taglines(21863): Started
D/Taglines(21863): Returning with 1
在那之后,没有什么特别的(PID 21863 没有任何东西).只是一堆:
After that, nothing special (nothing at all from PID 21863). Just a bunch of:
D/KeyguardViewMediator( 302): setHidden false
D/KeyguardViewMediator( 302): setHidden false
D/KeyguardViewMediator( 302): setHidden false
D/KeyguardViewMediator( 302): setHidden false
D/KeyguardViewMediator( 302): setHidden false
W/InputManagerService( 302): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@40bc06e8
D/KeyguardViewMediator( 302): setHidden false
D/KeyguardViewMediator( 302): setHidden false
D/KeyguardViewMediator( 302): setHidden false
D/KeyguardViewMediator( 302): setHidden false
D/KeyguardViewMediator( 302): setHidden false
D/KeyguardViewMediator( 302): setHidden false
D/KeyguardViewMediator( 302): setHidden false
D/KeyguardViewMediator( 302): setHidden false
D/KeyguardViewMediator( 302): setHidden false
我认为在这种情况下不需要它,但这是 AndroidManifest.xml 的相关部分:
I don't think it's needed in this case, but here's the relevant portion of the AndroidManifest.xml:
<service android:name=".TagsManager"
android:exported="false">
</service>
我可能哪里出错了?我还可以提供哪些其他信息?
Where might I have gone wrong? What other information can I provide?
正确答案
一些事情:
-
去掉
mNotificationManager.notify(NOTIFICATION_ID, notification);
.startForeground()
为您显示通知图标.
-
Get rid of the
mNotificationManager.notify(NOTIFICATION_ID, notification);
.startForeground()
displays the notification icon for you.
前台 Service
仍然可以被杀死,只是不太可能.
Foreground Service
s can still be killed, they're just less likely to be.
在 2.3 中有一个错误(不确定它是否已修复),当 Service
被杀死并重新启动时,它的 onStartCommand()
将不会又叫.相反,您将不得不在 onCreate()
中进行任何设置.
There's a bug in 2.3 (not sure if it was fixed yet) where when a Service
is killed and restarted, its onStartCommand()
will NOT be called again. Instead you're going to have to do any setting up in onCreate()
.
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