[英]Android/Java retrofit: Class cannot be converted to Callback
I'm new to retrofit and i am trying te get a json response to an object called RootObject
. 我是新手,我正在尝试获取一个名为
RootObject
的对象的json响应。 The error that i am stuck with is : 我坚持的错误是:
"Error:(21, 44) error: incompatible types: NewsController cannot be converted to Callback>"
“错误:(21,44)错误:不兼容的类型:NewsController无法转换为Callback>”
Does someone now my mistake here? 现在有人在我这里犯了错误吗? thanks in regards!
谢谢你!
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){
}
}
}
class to put the data: 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);
}
}
Interface: 接口:
public interface GetNewsService {
@GET("/Articles")
Call<List<RootObject>> GetNewsItems();
}
First of all, change your interface to this: 首先,将您的界面更改为:
public interface GetNewsService {
@GET("/Articles")
void GetNewsItems(Callback<List<RootObject>> cb);
}
Also change your newsController class. 还要更改你的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);
}
}
You'll need to add the following dependencies in your build.gradle
: 您需要在
build.gradle
添加以下依赖build.gradle
:
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'
@megh vidani's answer works, but he had you switch your code from Retrofit 2 to Retrofit 1. Here is how to do it in Retrofit 2. You would need to go back to your original gradle settings, etc. -- @megh vidani的回答是有效的,但是他让你将代码从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 -
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
}
});
}
}
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