我是改装的新手,我正在尝试对名为RootObject
的对象进行json响应。我坚持的错误是:
"错误:(21,44)错误:不兼容的类型:NewsController不能 转换为回调>"
现在有人在我这里犯了错误吗?谢谢!
public class NewsController {
public void getNews(){
Retrofit retrofit = new Retrofit.Builder().baseUrl("apilink").addConverterFactory(GsonConverterFactory.create()).build();
GetNewsService service = retrofit.create(GetNewsService.class);
try {
service.GetNewsItems().enqueue(this); //asynchronous
Response<List<RootObject>> response = service.GetNewsItems().execute(); //synchronous
}
catch (IOException e){
}
}
}
用于放置数据的类:
public class RootObject implements Serializable {
public ArrayList<Result> results ;
public int nextId;
public ArrayList<Result> getResults() { return results; }
public int getNextId() { return nextId; }
public String toString() {
return String.format("JEEJ" + nextId);
}
}
接口
public interface GetNewsService {
@GET("/Articles")
Call<List<RootObject>> GetNewsItems();
}
答案 0 :(得分:3)
首先, 将您的界面更改为:
public interface GetNewsService {
@GET("/Articles")
void GetNewsItems(Callback<List<RootObject>> cb);
}
同时更改你的newsController类。
public class NewsController {
private RestAdapter restAdapter;
static final String API_URL = "[Enter your API base url here]";
public void getNews(){
OkHttpClient mOkHttpClient = new OkHttpClient();
mOkHttpClient.setConnectTimeout(15000,TimeUnit.MILLISECONDS);
mOkHttpClient.setReadTimeout(15000,TimeUnit.MILLISECONDS);
restAdapter = new RestAdapter.Builder().setEndpoint(API_URL).setClient(new OkClient(mOkHttpClient)).setLogLevel(RestAdapter.LogLevel.FULL) .build();
GetNewsService service = restAdapter.create(GetNewsService.class);
Callback<List<RootObject> cb = new Callback<List<RootObject>>() {
@Override
public void success(List<RootObject> rootObjectList, Response response) {
//whatever you want to do with the fetched news items
}
@Override
public void failure(RetrofitError error) {
//whatever you want to do with the error
}
};
service.GetNewsItems(cb);
}
}
您需要在build.gradle
中添加以下依赖项:
compile 'com.squareup.retrofit:retrofit:1.9.0'
compile 'com.google.code.gson:gson:2.3.1'
compile 'com.squareup.okhttp:okhttp:2.4.0'
答案 1 :(得分:2)
@megh vidani的答案有效,但他让你将代码从Retrofit 2切换到Retrofit 1.以下是如何在Retrofit 2中进行操作。你需要回到原来的gradle设置等 - < / p>
public class NewsController {
public void getNews(){
Retrofit retrofit = new Retrofit.Builder().baseUrl("apilink").addConverterFactory(GsonConverterFactory.create()).build();
GetNewsService service = retrofit.create(GetNewsService.class);
service.GetNewsItems().enqueue(new Callback<List<RootObject>>() {
@Override
public void onResponse(Response<List<RootObject>> response) {
// Handle your response
// Note HTTP errors are delivered here, you can check
// response.isSuccess() or response.code() to determine
// HTTP failures
}
@Override
public void onFailure(Throwable t) {
// Network errors
}
});
}
}