Web视图消息通知

在Android应用程序中，可以使用Firebase Cloud Messaging（FCM）服务实现消息通知。以下是基本步骤：

1. 在Firebase控制台中，创建新的项目并启用FCM服务。
2. 在应用程序的build.gradle文件中添加以下依赖项：

implementation 'com.google.firebase:firebase-messaging:<version>'

3. 创建一个扩展FirebaseMessagingService的Java类，并覆盖onMessageReceived方法：

public class MyFirebaseMessagingService extends FirebaseMessagingService {

    private static final String TAG = "MyFirebaseMessagingService";

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);
        //处理收到的消息
        if (remoteMessage.getData().size() > 0) {
            //从获取的数据中处理信息进行通知等操作
        }
    }

}

4. 在AndroidManifest.xml文件中声明MyFirebaseMessagingService：

<service
    android:name=".MyFirebaseMessagingService">
    <intent-filter>
        <action android:name="com.google.firebase.MESSAGING_EVENT" />
    </intent-filter>
</service>

5. 在应用程序的Activity中实现一个方法，用于生成并显示通知：

private void showNotification(String title, String body) {
    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

    // 创建NotificationChannel(适用于Android O及以上版本)
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel channel = new NotificationChannel("CHANNEL_ID", "CHANNEL_NAME", NotificationManager.IMPORTANCE_DEFAULT);
        notificationManager.createNotificationChannel(channel);
    }

    NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "CHANNEL_ID")
            .setContentTitle(title)
            .setContentText(body)
            .setSmallIcon(R.drawable.notification_icon)
            .setAutoCancel(true);

    Notification notification = builder.build();
    notificationManager.notify(0, notification);
}

6. 在onMessageReceived方法中调用showNotification方法以显示通知：

public class MyFirebaseMessagingService extends FirebaseMessagingService {

    private static final String TAG = "