Retrofit: multiple query parameters in @GET command?

You should be using this syntax:

@GET("/my/API/call")Response getMyThing(    @Query("param1") String param1,    @Query("param2") String param2);

Specifying query parameters in the URL is only for when you know both the key and value and they are fixed.

If you have a bunch of GET params, another way to pass them into your url is a HashMap.

class YourActivity extends Activity {    private static final String BASEPATH = "http://www.example.com";    private interface API {        @GET("/thing")        void getMyThing(@QueryMap Map<String, String>, new Callback<String> callback);    }    public void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.your_layout);       RestAdapter rest = new RestAdapter.Builder().setEndpoint(BASEPATH).build();       API service      = rest.create(API.class);       Map<String, String> params = new HashMap<String, String>();       params.put("foo", "bar");       params.put("baz", "qux");       // ... as much as you need.       service.getMyThing(params, new Callback<String>() {           // ... do some stuff here.       });    }}

The URL called will be http://www.example.com/thing/?foo=bar&baz=qux

You can create a Map of params and send it like below:

Map<String, String> paramsMap = new HashMap<String, String>();paramsMap.put("p1", param1);paramsMap.put("p2", param2);// Inside call@GET("/my/api/call")Response getMyThing(@QueryMap Map<String, String> paramsMap);