Question

即使应用程序在后台，如何发送推送通知？我有一个Android应用程序，它从服务器接收推送通知，并且当应用程序在后台时它不会发送。仅在应用程序处于后台时发送。

Answer 1

您需要在清单文件中添加它：

    <service
        android:name=".name_of_your_firebase_instace_service"
        android:exported="false">
        <intent-filter>
            <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
        </intent-filter>
    </service>
    <service
        android:name=".nname_of_your_firebase_messaging_service
        android:exported="false">
        <intent-filter>
            <action android:name="com.google.firebase.MESSAGING_EVENT" />
        </intent-filter>
    </service>

这是刷新令牌（实例服务）的类

public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {
private static final String TAG = MyFirebaseInstanceIDService.class.getSimpleName();

@Override
public void onTokenRefresh() {
    super.onTokenRefresh();
    String refreshedToken = FirebaseInstanceId.getInstance().getToken();




    // sending reg id to your server
    sendRegistrationToServer(refreshedToken);

    Log.d("NewToken",refreshedToken);

}

private void sendRegistrationToServer(final String token) {
    // sending gcm token to server
    Log.e(TAG, "sendRegistrationToServer: " + token);
}

 }

消息服务，您将在其中接收消息/通知

public class MyFirebaseMessagingService extends FirebaseMessagingService {

private static final String TAG = MyFirebaseMessagingService.class.getSimpleName();

private NotificationUtils notificationUtils;

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    Log.e(TAG, "From: " + remoteMessage.getFrom());

    if (remoteMessage == null)
        return;

    // Check if message contains a notification payload.


    // Check if message contains a data payload.
    if (remoteMessage.getData().size() > 0) {
        Log.e(TAG, "Data Payload: " + remoteMessage.getData().toString());
        //you can send your own custom notification here if you are sending notification in data tag or if you are sending notification with "notification tag" it will handle it automatically


    }
}
}

注意：不要忘记将google-service.json文件添加到项目的应用文件夹中

当应用程序处于前台时发送推送通知

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