从 Android 中的服务发送通知

Sending a notification from a service in Android

提问by e-satis

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

我有一项服务正在运行，并想发送通知。太糟糕了，通知对象需要一个Context，就像一个Activity，而不是一个Service。

Do you know any way to by pass that ? I tried to create an Activityfor each notification but it seems ugly, and I can't find a way to launch an Activitywithout any View.

你知道有什么方法可以绕过吗？我试图Activity为每个通知创建一个，但它看起来很难看，而且我找不到一种方法来启动一个Activity没有任何View.

回答by Josef Pfleger

Both Activityand Serviceactually extendContextso you can simply use thisas your Contextwithin your Service.

无论Activity和Service实际extendContext，所以你可以简单地使用this作为您Context在您Service。

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);

回答by trante

This type of Notification is deprecated as seen from documents:

从文档中可以看出，这种类型的通知已被弃用：

@java.lang.Deprecated
public Notification(int icon, java.lang.CharSequence tickerText, long when) { /* compiled code */ }

public Notification(android.os.Parcel parcel) { /* compiled code */ }

@java.lang.Deprecated
public void setLatestEventInfo(android.content.Context context, java.lang.CharSequence contentTitle, java.lang.CharSequence contentText, android.app.PendingIntent contentIntent) { /* compiled code */ }

Better way
You can send a notification like this:

更好的方法
您可以发送这样的通知：

// prepare intent which is triggered if the
// notification is selected

Intent intent = new Intent(this, NotificationReceiver.class);
PendingIntent pIntent = PendingIntent.getActivity(this, 0, intent, 0);

// build notification
// the addAction re-use the same intent to keep the example short
Notification n  = new Notification.Builder(this)
        .setContentTitle("New mail from " + "[email protected]")
        .setContentText("Subject")
        .setSmallIcon(R.drawable.icon)
        .setContentIntent(pIntent)
        .setAutoCancel(true)
        .addAction(R.drawable.icon, "Call", pIntent)
        .addAction(R.drawable.icon, "More", pIntent)
        .addAction(R.drawable.icon, "And more", pIntent).build();


NotificationManager notificationManager = 
  (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

notificationManager.notify(0, n); 

Best way
Code above needs minimum API level 11 (Android 3.0).
If your minimum API level is lower than 11, you should you use support library's NotificationCompat class like this.

最佳方式
上面的代码需要最低 API 级别 11（Android 3.0）。
如果您的最低 API 级别低于 11，您应该像这样使用支持库的 NotificationCompat 类。

So if your minimum target API level is 4+ (Android 1.6+) use this:

因此，如果您的最低目标 API 级别为 4+（Android 1.6+），请使用以下命令：

    import android.support.v4.app.NotificationCompat;
    -------------
    NotificationCompat.Builder builder =
            new NotificationCompat.Builder(this)
                    .setSmallIcon(R.drawable.mylogo)
                    .setContentTitle("My Notification Title")
                    .setContentText("Something interesting happened");
    int NOTIFICATION_ID = 12345;

    Intent targetIntent = new Intent(this, MyFavoriteActivity.class);
    PendingIntent contentIntent = PendingIntent.getActivity(this, 0, targetIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    builder.setContentIntent(contentIntent);
    NotificationManager nManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    nManager.notify(NOTIFICATION_ID, builder.build());

回答by u4416697

@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);
}

回答by Martin Pfeffer

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

好吧，我不确定我的解决方案是否是最佳实践。使用NotificationBuilder我的代码看起来像这样：

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());
    }

Manifest:

显现：

    <activity
        android:name=".MainActivity"
        android:launchMode="singleInstance"
    </activity>

and here the Service:

这里的服务：

    <service
        android:name=".services.ProtectionService"
        android:launchMode="singleTask">
    </service>

I don't know if there really is a singleTaskat Servicebut this works properly at my application...

我不知道是否真的有singleTaskatService但这在我的应用程序中正常工作......

回答by kurdist android

If none of these work, try getBaseContext(), instead of contextor this.

如果这些都不起作用，请尝试getBaseContext(), 而不是context或this。