如何自定义通过FCM接收到的显示通知？

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

public class MyFirebaseMessagingService extends FirebaseMessagingService {
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        // 获取通知的标题、内容等信息
        String title = remoteMessage.getNotification().getTitle();
        String body = remoteMessage.getNotification().getBody();

        // 自定义通知的显示方式
        // ...

        // 显示通知
        showNotification(title, body);
    }

    private void showNotification(String title, String body) {
        // 创建通知的Builder
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "channel_id")
                .setSmallIcon(R.drawable.notification_icon)
                .setContentTitle(title)
                .setContentText(body)
                .setPriority(NotificationCompat.PRIORITY_DEFAULT);

        // 显示通知
        NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
        notificationManager.notify(0, builder.build());
    }
}

<application>
    ...
    <meta-data
        android:name="com.google.firebase.messaging.default_notification_channel_id"
        android:value="@string/default_notification_channel_id" />
    ...
</application>

<resources>
    ...
    <string name="default_notification_channel_id">channel_id</string>
    <string name="default_notification_channel_name">Channel Name</string>
    ...
</resources>