Geoquery to populate a ListView/RecyclerView

Question

I'm developing an Android App with Firebase as a backend. So far it worked very smoothly and I loved it, but now I encountered a major roadblock. The app has to search for deals around a certain location and then populate a ListView (or a RecyclerView) accordingly. I've already included Geofire in my Firebase structure, having a main deals node and a geofire node with the same keys, and the Geoquery is returning them fine.

My problem is that the FirebaseListAdapter that I've grabbed from the Firebase examples doesn't have a single item add method, that it's what I'll need as the Geoquery will return only one key at time. After a long search, I've haven't been able to find an example of code that was dealing with the same issue, so I would like to ask for some advice on how, and which is the most efficient way to implement this.

Thanks

P.S.: my firebase structure:

{
  "deals" : {
    "-JikH6yjJ9TblE8_4fX4" : {
      "category" : "Food",
      "description" : "example description",
      "location" : "George St, Brisbane",
      "title" : "some title",
    }
  },
  "geofire" : {
    "-JikH6yjJ9TblE8_4fX4" : {
      ".priority" : "r7hgf2d639",
      "g" : "r7hgf2d639",
      "l" : [ -27.46268003, 153.03172851 ]
    }
  }
}

possible duplicate of [How to populate Android ListView with information from Firebase query](http://stackoverflow.com/questions/27414344/how-to-populate-android-listview-with-information-from-firebase-query) — Kato, Mar 02 '15 at 17:54

score 2 · Accepted Answer · answered Mar 03 '15 at 01:45

2

FirebaseListAdapter will only work for the simple case where you want to add all children from a Firebase location into a list. It is intended as a simple helper class. With more complicated examples like this, you will need to write your own ListAdapter.

After receiving a key entered event for your GeoQuery you can add a value listener for the actual values in the deals node. You can then use those value events to populate and update your list view.

Make sure to remove the value listener(s) on a key exit event or when you dispose of the list view.

answered Mar 03 '15 at 01:45

jonnydee

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I solved momentarily, fetching the .json key element and parsing it in the list as a object at it works, even if it's quite slow. – Emanuele Tonello Mar 03 '15 at 12:35
I actually tried to use the `addListenerForSingleValueEvent` and it's way faster and more efficient. Thanks @jonnydee – Emanuele Tonello Mar 03 '15 at 13:06
@ymerdrengene I wasn't checking out that code in a while, but I've been able to extract it in a gist for you (actually 2). [ExampleFragment](https://gist.github.com/emanuelet/b8c0049fc29702bc2fdbd493b385e7b2) and [ListAdapter](https://gist.github.com/emanuelet/38f490bdbb4b7b91f183) – Emanuele Tonello Apr 11 '16 at 04:44
@EmanueleTonello Thank you, it looks awesome :) In ExampleFragment.java what kind of Adapter are you using? The one that says ItemListAdapter. – ymerdrengene Apr 11 '16 at 12:13
@ymerdrengene I rename it to make it generic, but is in second gist that I attached to message with the Adapter and the abstract class – Emanuele Tonello Apr 12 '16 at 14:06
@EmanueleTonello I tried your newly added ExampleAdapter (https://gist.github.com/emanuelet/38f490bdbb4b7b91f183#file-exampleadapter-java) and it worked :) I can now display a ListView with a GeoFire query. Thank you! – ymerdrengene Apr 13 '16 at 19:32

Geoquery to populate a ListView/RecyclerView

1 Answers1