Android 在MyFirebaseMessagingService中获取应用程序上下文

我需要从MyFirebaseMessagingService类调用一个worker方法，该类接受上下文作为参数。但我无法访问MyFirebaseMessagingService中的应用程序上下文。如何做到这一点

public class MyFirebaseMessagingService extends FirebaseMessagingService {

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

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

        if (remoteMessage.getData().size() > 0) {
            Log.d(TAG, "Message data payload: " + remoteMessage.getData());


            MessageSender messageSender = new MessageSender();
            messageSender.sendMessage(CONTEXT HERE);

            if (/* Check if data needs to be processed by long running job */ true) {
                // For long-running tasks (10 seconds or more) use Firebase Job Dispatcher.
                //scheduleJob();
            } else {
                // Handle message within 10 seconds
                //handleNow();
            }

        }

        // Check if message contains a notification payload.
        if (remoteMessage.getNotification() != null) {
            Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
        }

        // Also if you intend on generating your own notifications as a result of a received FCM
        // message, here is where that should be initiated. See sendNotification method below.
    }
}

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FirebaseMessagingService

扩展

服务

和

Service

扩展

ContextWrapper

和

ContextWrapper

扩展

Context

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所以这也是一个背景，因此，请使用MyFirebaseMessagingService。此或简单的

此

在firebase Messaging17.3上不再有效。3@RandySugianto来自的“Yuku”仍然有效，实现步骤仍然相同。@Pavneet_Singh我读过，但它不工作，我得到了

android.content.Context android.content.Context.getApplicationContext（）'在空对象引用上