如何从Android设备调用ASP.NET Web API

Question

I have a web api controller:

// POST: api/CountriesAPI
[ResponseType(typeof(Country))]
public async Task<IHttpActionResult> PostCountry(Country country)
{
    if (!ModelState.IsValid)
    {
        return BadRequest(ModelState);
    }

    db.Countries.Add(country);
    await db.SaveChangesAsync();

    return CreatedAtRoute("DefaultApi", new { id = country.CountryID }, country);
}

I don't know how how to consume this from android. please help.

Answer 1

You can try Libraries like Volley (Requires you to write boilerplate code) or RetroFit

You can make get and post requests using them, do read about Pojos and model creation before you start. And also how do Callbacks work.

Answer 2

I've used the Android HTTP Client available here and found it very simple and easy to use.

You can then do a POST with code something like below:

public class HTTPClient 
{
    private static AsyncHttpClient client = new AsyncHttpClient();

    public static void get(String url, RequestParams params, AsyncHttpResponseHandler responseHandler)
    {
        client.get(url, params, responseHandler);
    }

    public static void get(String url, FileAsyncHttpResponseHandler responseHandler)
    {
        client.get(url, responseHandler);
    }

    public static void post(Context context, String url, StringEntity entity, String contentType, AsyncHttpResponseHandler responseHandler)
    {
        client.post(context, url, entity, contentType, responseHandler);
    }
}


HTTPClient.post(this, <server_url>, entity, "application/json", new AsyncHttpResponseHandler() {
    @Override
    public void onSuccess(String response)
    {
        // Do Something
    }

    @Override
    public void onFailure(Throwable error, String content)
    {
        // Do Something else
    }
});