We're moving from Apache's http client to Retrofit and we've found some edge cases where param values can be null.
Apache used to intercept these and turn them into empty strings, but Retrofit throws an IllegalArgumentException.
We want to replicate the old behavior so that it doesn't cause any unexpected issues out in production. Is there a way for me to swap these null values with empty strings before ParameterHandler throws an exception?
You can try the following:
My web service (Asp.Net WebAPI):
[Route("api/values/getoptional")]
public IHttpActionResult GetOptional(string id = null)
{
var response = new
{
Code = 200,
Message = id != null ? id : "Response Message"
};
return Ok(response);
}
Android client:
public interface WebAPIService {
...
#GET("/api/values/getoptional")
Call<JsonObject> getOptional(#Query("id") String id);
}
MainActivity.java:
...
Call<JsonObject> jsonObjectCall1 = service.getOptional("240780"); // or service.getOptional(null);
jsonObjectCall1.enqueue(new Callback<JsonObject>() {
#Override
public void onResponse(Call<JsonObject> call, Response<JsonObject> response) {
Log.i(LOG_TAG, response.body().toString());
}
#Override
public void onFailure(Call<JsonObject> call, Throwable t) {
Log.e(LOG_TAG, t.toString());
}
});
...
Logcat output:
If using service.getOptional(null);
04-15 13:56:56.173 13484-13484/com.example.asyncretrofit I/AsyncRetrofit: {"Code":200,"Message":"Response Message"}
If using service.getOptional("240780");
04-15 13:57:56.378 13484-13484/com.example.asyncretrofit I/AsyncRetrofit: {"Code":200,"Message":"240780"}
Related
I'm using MVVM Design Pattern to build this app, but when I load data user using the searching method I get issue like this:
2020-05-04 11:34:55.839 11187-11187/com.planetmars23.im.movie_catalogue D/imam_log: null
2020-05-04 11:34:55.839 11187-11187/com.planetmars23.im.movie_catalogue I/imam_log: setSearchUserGithub - Response success
public void setSearchUserGithub(String accessToken, String user) {
Call<UserDataObject> githubSearchObjectCall = service.userSearchResult(user);
githubSearchObjectCall.enqueue(new Callback<UserDataObject>() {
#Override
public void onResponse(Call<UserDataObject> call, Response<UserDataObject> response) {
assert response.body() != null;
listGithub.setValue(response.body().getResults());
Log.d(Base.LOG, String.valueOf(response.body().getResults()));
Log.i(Base.LOG, "setSearchUserGithub - Response success");
}
#Override
public void onFailure(Call<UserDataObject> call, Throwable t) {
Log.w(Base.LOG, "setSearchUserGithub - Response failed :" + t.getMessage());
}
});
}
I'm using this for GitHub service
#GET("/search/users?")
#Headers("Authorization:"+ Base.KEY)
Call<UserDataObject> userSearchResult(#Query("q") String username);
my python code in django is:
#csrf_exempt
def login(request):
data = {'a': '1'}
if request.method == 'POST':
form=login_form(request.POST)
if form.is_valid():
f = form.cleaned_data
if sign_in.objects.filter(username=f['user'], password=hashlib.md5(f['pas'].encode()).hexdigest()):
return JsonResponse(data)
and in android:
ApiInterface apiInterface = ApiClinet.GetClinet().create(ApiInterface.class);
Call<String> call = apiInterface.GetHome_call("x","y");
call.enqueue(new Callback<String>() {
#Override
public void onResponse(Call<String> call, Response<String> response) {
}
#Override
public void onFailure(Call<String> call, Throwable t) {
}
});
this code work in postman and recive:
{
"a": "1"
}
but when run in android. recive internal sever error!
and I work on localhost.
The Error must either be in your ApiClient Code or else check your #POST("") correctly , you need to put forward slash at it's end like this: #POST("login/").
Hope this helps,If not please update your question with the Client Code .
get request endpoint method defined in api interface
#GET("youtube/v3/search")
Callback<YoutubeResponse> getYouTubeVideos(#Query("key") String apiKey,
#Query("channelId") String channelId,
#Query("part") String videoPart,
#Query("order") String videoOrder,
#Query("maxResults") int maxResults,
Callback<ChannelListResponse> callback);
Method call to get the results :
Callback <YoutubeResponse> call = apiService.getYouTubeVideos(API_KEY,
"UCjXfkj5iapKHJrhYfAF9ZGg", "snippet", "date", 20, new Callback<ChannelListResponse>() {
#Override
public void onResponse(Call<ChannelListResponse> call, Response<ChannelListResponse> response) {
Log.v("check", response.body().getEtag() + "check");
}
#Override
public void onFailure(Call<ChannelListResponse> call, Throwable t) {
}
}) ;
I am not getting results via this implementaion giving illegal stat exception .
There is some structual mistake because the log says Unable to create call adapter for retrofit2.Callbackfor method ApiInterface.getYouTubeVideos
using these additional links to implement the same . Using this reference link for help : YouTube Data API v3 search JSON response retrofit parsing error
But If keep the return type of getYouTubeVideos() as void. Then it says service method can not have void return type .
A help in this regards will be appreciated
Please correct the retofit syntax like this.
api interface,
#GET("youtube/v3/search")
Call<ChannelListResponse> getYouTubeVideos(#Query("key") String apiKey,
#Query("channelId") String channelId,
#Query("part") String videoPart,
#Query("order") String videoOrder,
#Query("maxResults") int maxResults);
Method call,
Call<ChannelListResponse> call = apiService.getYouTubeVideos(API_KEY,
"UCjXfkj5iapKHJrhYfAF9ZGg", "snippet", "date", 20);
call.enqueue(new Callback<ChannelListResponse>() {
#Override
public void onResponse(Call<ChannelListResponse>call,
Response<ChannelListResponse> response) {
Log.d(TAG, "onResponse");
}
#Override
public void onFailure(Call<ChannelListResponse>call, Throwable t) {
// Log error here since request failed
Log.e(TAG, t.toString());
}
});
I'm trying to get a json list from a web service.
This is the json string return by server :
[{"categoryName":"Política"},{"categoryName":"Economía"},{"categoryName":"Cultura"},{"categoryName":"Deportes"}
The problem is converting in to the POJO. The special characters (í) it's appear like "Pol�tica".
This is the retrofit call function :
#GET("categories")
public Call<List<CategoryPojo>> getCategorias(#Query("sitename") String site)
this is the callback function:
Call<List<CategoryPojo>> call = restservice.getApiService().getCategorias(medio);
try {
call.enqueue(new Callback<List<CategoryPojo>>() {
#Override
public void onResponse(Call<List<CategoryPojo>> call, Response<List<CategoryPojo>> response) {
List<CategoryPojo> categories = response.body();
if (listener != null)
listener.onDataLoaded(categories);
}
#Override
public void onFailure(Call<List<CategoryPojo>> call, Throwable throwable) {
Log.e("Retrofit Error", throwable.getMessage());
}
});
this is the POJO:
public class CategoryPojo implements Serializable{
public CategoryPojo() { }
#SerializedName("categoryName")
private String name;
public String getName()
{
return this.name;
}
}
The result of the request to the Web services, (output in browser) is :
[{"categoryName":"Política"},{"categoryName":"Economía"},{"categoryName":"Cultura"},{"categoryName":"Deportes"},{"categoryName":"Salud"},{"categoryName":"Ciencia y Tecnología"},{"categoryName":"Medio Ambiente"},{"categoryName":"Medios"},{"categoryName":"Militar e Inteligencia"},{"categoryName":"Sociedad"}]
So, the return json has a good encoding...i think that maybe is about the way retrofit read the response.
I'm using retrofit-2.0.2, gson-2.6.1, converter-gson-2.0.2, okhttp-3.2.0.
Any help? please
You should check Content-type in the response headers. Look for the charset value and try to change that on the backend side to application/josn;charset=UTF-8. That worked for me.
I want to observer changes from server in my android app.
So I'm using this interface for open stream with server.
public interface Service {
#GET("/n/{id}/streaming")
void streamThreads(#Path("name_space_id") String Id, #QueryMap Map<String, String> options,#Query("exclude_types") String type, Callback<Object> callback);
}
and this is my method where I can get response in my activity
server.streamThreads(accountInfo.getId(), map, "thread", new Callback<Object>() {
#Override
public void success(Object o, Response response) {
String json = (String) o;
Log.i(TAG,json);
}
#Override
public void failure(RetrofitError error) {
Response r = error.getResponse();
if (r != null)
Log.e(TAG, "error: " + r.getReason());
}
});
So I tested method in web browser and life stream works.
But response comes in my mobile app every 30 minutes. I'm using one activity and call method onCreate().
Thanks
Retrofit provides an #Streaming annotation.
The unread byteStream can then be obtained from the raw OkHttp ResponseBody.