如何在Firebase中保存位置信息 [英] how to save Location Info in Firebase

问题描述

我试图保存位置（如latitide和longitude）作为Firebase中的一个键/字段。在他们的示例

我可以保存其他类型的字符串Firebase虽然。我只是使用下面的代码。
问题是 位置字段是什么数据类型？

  Firebase ref = new Firebase（https://myfirebaselink.firebaseio.com/）; 
 $ b $ //用户
 alan =新用户（Alan Turing，1912）; 
 
 
 alanRef.setValue（obj）; 
  

我试过 location c $ c> List< String> ，但没有奏效 - 位置字段如下所示：

编辑：在更多的研究中，发现这个由Google发布的博文，但它们也保存为 latitude1和经度。这可能是在 GeoFire`被引入之前写的。 GeoFire for Java项目有一个很棒的自述文件，涵盖（除其他外）设置位置数据：

在GeoFire您可以通过字符串键设置和查询位置。要为某个键设置位置，只需调用 setLocation（）方法即可。该方法将一个键作为字符串传递，并将位置作为包含位置经纬度的 GeoLocation 对象：

  geoFire.setLocation（firebase-hq，new GeoLocation（37.7853889，-122.4056973））; 
  

要检查写入是否成功保存在服务器上，可以向 setLocation（）调用中添加 GeoFire.CompletionListener ：

geoFire.setLocation（firebase-hq，new GeoLocation（37.7853889，-122.4056973），new GeoFire.CompletionListener（）{
，

  @Override 
 public void onComplete（String key，FirebaseError error）{
 if（error！= null）{
 System.err.println（将位置保存到GeoFire： + error; 
} else {
 System.out.println（成功保存在服务器上的位置！）; 
} 
} 
}）; 
  

要删除某个位置并将其从数据库中删除，只需传递位置key to removeLocation：

  geoFire.removeLocation（firebase-hq）; 
  

I am trying to save location (so latitide and longitude) as one of the keys/fields in Firebase. In their example SFVehicles, they do show how to query once the information is stored but my problem is how do i save in the first place.

In their blog post, GeoFire goes Mobile, they are showing how the data would look like - but how do I get that location field populated?

I am able to save other types of strings to the Firebase though. I just use the code below. Question is What data type should the location field be?

        Firebase ref = new Firebase("https://myfirebaselink.firebaseio.com/");

       //User 
       alan = new User("Alan Turing", 1912);


        alanRef.setValue(obj);

I tried location to be a List<String>, but that did not work -- the location field looked like below:

Edit: On more research, found this blog post by Google but they are also saving as keys latitude1 andlongitude. This probably was written beforeGeoFire` was introduced.

解决方案

The GeoFire for Java project has a great README, that covers (amongst other) setting location data:

In GeoFire you can set and query locations by string keys. To set a location for a key simply call the setLocation() method. The method is passed a key as a string and the location as a GeoLocation object containing the location's latitude and longitude:

geoFire.setLocation("firebase-hq", new GeoLocation(37.7853889, -122.4056973));

To check if a write was successfully saved on the server, you can add a GeoFire.CompletionListener to the setLocation() call:

geoFire.setLocation("firebase-hq", new GeoLocation(37.7853889, -122.4056973), new GeoFire.CompletionListener() {
    @Override
    public void onComplete(String key, FirebaseError error) {
        if (error != null) {
            System.err.println("There was an error saving the location to GeoFire: " + error);
        } else {
            System.out.println("Location saved on server successfully!");
        }
    }
});

To remove a location and delete it from the database simply pass the location's key to removeLocation:

geoFire.removeLocation("firebase-hq");

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