从一个服务通知 [英] Notification from a service
问题描述
我想收到C2DM消息时显示一个简单的通知。服务提供的用户界面，但仍是主线程上运行。我见过的人声称可以创建和服务显示通知。
I'm trying to display a simple notification when a C2DM message is received. Services provide to UI but still run on the main thread. I've seen people claim you can create and display Notifications from a service.
@Override
public void onMessage(Context context, Intent intent) {
Log.w("Messsage","Message Received");
Bundle extras = intent.getExtras();
if (extras != null) {
String payload = (String) extras.get("test");
createNotification(context,payload);
}
}
private void createNotification(Context context, String message){
NotificationManager notificationmanager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = new Notification(R.drawable.default1,message,System.currentTimeMillis());
notificationmanager.notify(0,notification);
}
}
06-15 15:39:13.580: E/AndroidRuntime(11603): FATAL EXCEPTION: IntentService [stp.chrome@gmail.com]
06-15 15:39:13.580: E/AndroidRuntime(11603): java.lang.IllegalArgumentException: contentView required: pkg=com.upmc id=0 notification=Notification(contentView=null vibrate=null,sound=null,defaults=0x0,flags=0x0)
06-15 15:39:13.580: E/AndroidRuntime(11603): at android.os.Parcel.readException(Parcel.java:1331)
06-15 15:39:13.580: E/AndroidRuntime(11603): at android.os.Parcel.readException(Parcel.java:1281)
06-15 15:39:13.580: E/AndroidRuntime(11603): at android.app.INotificationManager$Stub$Proxy.enqueueNotificationWithTag(INotificationManager.java:299)
06-15 15:39:13.580: E/AndroidRuntime(11603): at android.app.NotificationManager.notify(NotificationManager.java:124)
06-15 15:39:13.580: E/AndroidRuntime(11603): at android.app.NotificationManager.notify(NotificationManager.java:103)
06-15 15:39:13.580: E/AndroidRuntime(11603): at com.upmc.C2DMReceiver.createNotification(C2DMReceiver.java:80)
06-15 15:39:13.580: E/AndroidRuntime(11603): at com.upmc.C2DMReceiver.onMessage(C2DMReceiver.java:66)
06-15 15:39:13.580: E/AndroidRuntime(11603): at com.google.android.c2dm.C2DMBaseReceiver.onHandleIntent(C2DMBaseReceiver.java:108)
06-15 15:39:13.580: E/AndroidRuntime(11603): at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
06-15 15:39:13.580: E/AndroidRuntime(11603): at android.os.Handler.dispatchMessage(Handler.java:99)
06-15 15:39:13.580: E/AndroidRuntime(11603): at android.os.Looper.loop(Looper.java:137)
06-15 15:39:13.580: E/AndroidRuntime(11603): at android.os.HandlerThread.run(HandlerThread.java:60)
我不知道为什么这个异常被抛出。
I have no idea why this exception is being thrown.
推荐答案
首先，异常被抛出，因为你创建一个通知有引用它（内容查看属性设置为null）没有视图对象。你要叫<一href="http://developer.android.com/reference/android/app/Notification.html#setLatestEventInfo%28android.content.Context,%20java.lang.CharSequence,%20java.lang.CharSequence,%20android.app.PendingIntent%29">setLatestEventInfo前显示通知。
First, the exception is thrown because you create a notification which has no view object referenced to it (contentView attribute is set to null) . You have to call setLatestEventInfo before showing the notification.
二，您使用的构造函数是<一个href="http://developer.android.com/reference/android/app/Notification.html#Notification%28int,%20java.lang.CharSequence,%20long%29">de$p$pcated.请使用类<一href="http://developer.android.com/reference/android/app/Notification.Builder.html">Notification.Builder创建通知。如果你支持Android＆LT; API级别11，您可以使用类<一href="http://developer.android.com/reference/android/support/v4/app/NotificationCompat.Builder.html">NotificationCompat.Builder从支持库。
Second, the constructor you're using is deprecated. Please use the class Notification.Builder for creating notifications. If you support Android < API level 11, you can use the class NotificationCompat.Builder from the support library.
三，是的，它可以从一个正在运行的服务创建的通知。
Third, yes it is possible to create notifications from a running service.
这篇关于从一个服务通知的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
