如何通过API调用存储JSON数据

Question

I'm a novice programmer so feel free to comment on things that make no sense so that I can learn.

I'm working on a coffee shop finder android app that makes calls to the SimpleGeo API to get each place of interest. I'm having trouble thinking up a way to store the returned JSON data in a way that I can use for my purposes. I need to do 2 things with the data: first, I need a map overlay class to access it so I can draw markers for each coffee shop (which I'm okay with); second, I need to display the data in a list view.

The API call:

    /** Queries SimpleGeo with current location **/
    private void getJSONData() {
    SimpleGeoPlacesClient client = SimpleGeoPlacesClient.getInstance();
    client.getHttpClient().setToken(oauth_key, oauth_secret);
    double radius = 25;
    try {
        client.search(lat, lng, "coffee", null, radius,
                new FeatureCollectionCallback() {
                    public void onSuccess(FeatureCollection collection) {
                        try {
                            features = collection.toJSON();
                        } catch (JSONException e) {
                            System.out.println(e.getMessage());
                        }
                    }

                    public void onError(String errorMessage) {
                        System.out.println(errorMessage);
                    }
                });
    } catch (IOException e) {
        System.out.println(e.getMessage());
    }
}

Parsing the data:

    private void parseJSONData() throws JSONException {
    for (int i = 0; i < features.length(); i++) {
        JSONObject feature = features.getJSONObject(i).getJSONObject(
                "feature");
    }
}

I'm currently trying to create java objects out of the data using GSON outlined in this tutorial. Would SQLite be appropriate for this? Any pro-tips would be greatly appreciated.

Thanks.

Answer 1

Assuming you are working with android, you can use google map view

view,com.google.android.maps.MapView http://developer.android.com/resources/tutorials/views/hello-mapview.html

and ListView http://developer.android.com/reference/android/widget/ListView.html

I dont see how SQLite fits in here , unless you plan to store the places across app restarts. All you need to do is extract place information from JSON and do whatever you want with that data.

Answer 2

I realize that an answer was already accepted, but I'm tossing my 2 bits in, anyhow...

It may not be that the response JSON needs be persisted (in SQLite or a text file), in order to "avoid unnecessary API calls." More information about the app would be needed to determine this.

Copying from a blog post my friend asked me to proofread:

In some situations, GSON makes it fantastically simple to create Java objects from JSON, though many of the examples (especially those in blog posts) are lamely trivial or unnecessarily complex, often being little more than copy-paste examples (with names changed) from the GSON documentation, which is the heart of the problem - the docs aren't very thorough in their examples, and they quickly make it seem like complex objects are complicated to map.

But I digress...

If the problem is that one doesn't know how to use JSON and/or GSON, this does not imply that the solution involves SQLite or text file persistence or any kind of persistence.

Regarding the code in the original question, it looks like it assumes that objects in the response JSON will appear in some particular order. It's my experience that this is often not a safe assumption to make. Sometimes itemX comes first, sometimes it comes third. (This of course depends on the system generating the response.) So, parse the result allowing for the order of JSON objects to vary.

Regarding whether to persist the JSON data, again, more would need to be known about the app than what was explained, so far.