blocks|key|1275402|text|Activity和Service实际上都是extend+Context，因此您可以简单地使用this作为Service中的Context。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1275403|NotificationManager+notificationManager+=
++++(NotificationManager)+getSystemService(Service.NOTIFICATION_SERVICE);
Notification+notification+=+new+Notification(/*+your+notification+*/);
PendingIntent+pendingIntent+=+/*+your+intent+*/;
notification.setLatestEventInfo(this,+/*+your+content+*/,+pendingIntent);
notificationManager.notify(/*+id+*/,+notification);|code-block|syntax|javascript|1275404|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/content/Context.html^0|0|8|9|7|L|6|S|7|1A|4|1G|7|1P|7|S|7|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]]|E|$]]|$1|F|3|G|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

Both <code>Activity</code> and <code>Service</code> actually <code>extend</code> <a href="http://developer.android.com/reference/android/content/Context.html" rel="noreferrer"><code>Context</code></a> so you can simply use <code>this</code> as your <code>Context</code> within your <code>Service</code>.

<pre><code>NotificationManager notificationManager =
 (NotificationManager) getSystemService(Service.NOTIFICATION_SERVICE);
Notification notification = new Notification(/* your notification */);
PendingIntent pendingIntent = /* your intent */;
notification.setLatestEventInfo(this, /* your content */, pendingIntent);
notificationManager.notify(/* id */, notification);
</code></pre>

blocks|key|1490309|text|好吧，我不确定我的解决方案是否是最佳实践。使用NotificationBuilder时，我的代码如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1490310|private+void+showNotification()+{
++++Intent+notificationIntent+=+new+Intent(this,+MainActivity.class);

++++PendingIntent+contentIntent+=+PendingIntent.getActivity(
++++++++++++++++this,+0,+notificationIntent,+PendingIntent.FLAG_UPDATE_CURRENT);
++++builder.setContentIntent(contentIntent);
++++NotificationManager+notificationManager+=
++++++++++++(NotificationManager)+getSystemService(Context.NOTIFICATION_SERVICE);
++++notificationManager.notify(NOTIFICATION_ID,+builder.build());
++++}|code-block|syntax|javascript|1490311|清单：|1490312|++++<activity
++++++++android:name=".MainActivity"
++++++++android:launchMode="singleInstance"
++++</activity>|1490313|这里是服务：|1490314|++++<service
++++++++android:name=".services.ProtectionService"
++++++++android:launchMode="singleTask">
++++</service>|1490315|我不知道Service上是否真的有singleTask，但这在我的应用程序中工作正常……|1490316|entityMap^0|N|J|0|0|0|0|0|0|4|7|H|A|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|12|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@]|E|$]]|$1|U|3|-4|5|6|7|19|8|@]|D|@]|E|$]]]|V|$]]

Well, I'm not sure if my solution is best practice. Using the <code>NotificationBuilder</code> my code looks like that:

<pre><code>private void showNotification() {
 Intent notificationIntent = new Intent(this, MainActivity.class);

 PendingIntent contentIntent = PendingIntent.getActivity(
 this, 0, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
 builder.setContentIntent(contentIntent);
 NotificationManager notificationManager =
 (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 notificationManager.notify(NOTIFICATION_ID, builder.build());
 }
</code></pre>

Manifest: 

<pre><code> &lt;activity
 android:name=".MainActivity"
 android:launchMode="singleInstance"
 &lt;/activity&gt;
</code></pre>

and here the Service:

<pre><code> &lt;service
 android:name=".services.ProtectionService"
 android:launchMode="singleTask"&gt;
 &lt;/service&gt;
</code></pre>

I don't know if there really is a <code>singleTask</code> at <code>Service</code> but this works properly at my application...

blocks|key|1490339|text|@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public+void+PushNotification()
{
++++NotificationManager+nm+=+(NotificationManager)context.getSystemService(NOTIFICATION_SERVICE);
++++Notification.Builder+builder+=+new+Notification.Builder(context);
++++Intent+notificationIntent+=+new+Intent(context,+MainActivity.class);
++++PendingIntent+contentIntent+=+PendingIntent.getActivity(context,0,notificationIntent,0);

++++//set
++++builder.setContentIntent(contentIntent);
++++builder.setSmallIcon(R.drawable.cal_icon);
++++builder.setContentText("Contents");
++++builder.setContentTitle("title");
++++builder.setAutoCancel(true);
++++builder.setDefaults(Notification.DEFAULT_ALL);

++++Notification+notification+=+builder.build();
++++nm.notify((int)System.currentTimeMillis(),notification);
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1490340|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public void PushNotification()
{
 NotificationManager nm = (NotificationManager)context.getSystemService(NOTIFICATION_SERVICE);
 Notification.Builder builder = new Notification.Builder(context);
 Intent notificationIntent = new Intent(context, MainActivity.class);
 PendingIntent contentIntent = PendingIntent.getActivity(context,0,notificationIntent,0);

 //set
 builder.setContentIntent(contentIntent);
 builder.setSmallIcon(R.drawable.cal_icon);
 builder.setContentText("Contents");
 builder.setContentTitle("title");
 builder.setAutoCancel(true);
 builder.setDefaults(Notification.DEFAULT_ALL);

 Notification notification = builder.build();
 nm.notify((int)System.currentTimeMillis(),notification);
}
</code></pre>

blocks|key|1275518|text|如果这些都不起作用，请尝试使用getBaseContext()，而不是context或this。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1275519|entityMap^0|F|G|Z|7|17|4|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

If none of these work, try <code>getBaseContext()</code>, instead of <code>context</code> or <code>this</code>.

I have a service running, and would like to send a notification. Too bad, the notification object requires a <code>Context</code>, like an <code>Activity</code>, and not a <code>Service</code>.

Do you know any way to by pass that ? I tried to create an <code>Activity</code> for each notification but it seems ugly, and I can't find a way to launch an <code>Activity</code> without any <code>View</code>.

Sending a notification from a service in Android

我有一个服务正在运行，我想发送一个通知。太糟糕了，通知对象需要像Activity这样的Context，而不是Service。你知道有什么方法可以绕过它吗？我试图为每个通知创建一个Activity，但它看起来很难看，而且我找不到一种没有任何View的方法来启动Activity。

问从Android中的服务发送通知
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