API-декларации должны быть интерфейсами. Retrofit

Question

Я пытаюсь сделать простой ответ, используя Retrofit. И у меня ошибка java.lang.IllegalArgumentException: API declarations must be interfaces.. Я не могу понять, в чем именно проблема. У меня есть эта ошибка, когда я пытаюсь сделать CategoryJsonParser categoryParsed = retrofit.create(CategoryJsonParser.class);.

Таким образом, ее мой интерфейс:

public interface InterfaceForCategory { 
@GET("categories?api_key=l6pdqjuf7hdf97h1yvzadfce") 
Call<List<CategoryJsonParser>> getData(); 
} 

Как я создать переоснащения в главном акте:

//get retrofit builder 
Retrofit retrofit = new Retrofit.Builder() 
     .baseUrl("https://openapi.etsy.com/v2/taxonomy/") 
     .addConverterFactory(GsonConverterFactory.create()) 
     .build(); 

CategoryJsonParser categoryParsed = retrofit.create(CategoryJsonParser.class); // this line error 

Вот если мой CategoryJsonParser:

@Generated("net.hexar.json2pojo") 
@SuppressWarnings("unused") 
public class CategoryJsonParser { 

    @SerializedName("count") 
    private Long mCount; 
    @SerializedName("pagination") 
    private Pagination mPagination; 
    @SerializedName("params") 
    private Object mParams; 
    @SerializedName("results") 
    private List<JsonCategoryParsed> mResults; 
    @SerializedName("type") 
    private String mType; 

    public Long getCount() { 
     return mCount; 
    } 

    public void setCount(Long count) { 
     mCount = count; 
    } 

    public Pagination getPagination() { 
     return mPagination; 
    } 

    public void setPagination(Pagination pagination) { 
     mPagination = pagination; 
    } 

    public Object getParams() { 
     return mParams; 
    } 

    public void setParams(Object params) { 
     mParams = params; 
    } 

    public List<JsonCategoryParsed> getResults() { 
     return mResults; 
    } 

    public void setResults(List<JsonCategoryParsed> results) { 
     mResults = results; 
    } 

    public String getType() { 
     return mType; 
    } 

    public void setType(String type) { 
     mType = type; 
    } 

} 

И это моя JsonCategoryParserd:

@Generated("net.hexar.json2pojo") 
@SuppressWarnings("unused") 
public class JsonCategoryParsed { 

    @SerializedName("category_id") 
    private Long mCategoryId; 
    @SerializedName("category_name") 
    private String mCategoryName; 
    @SerializedName("long_name") 
    private String mLongName; 
    @SerializedName("meta_description") 
    private String mMetaDescription; 
    @SerializedName("meta_keywords") 
    private String mMetaKeywords; 
    @SerializedName("meta_title") 
    private String mMetaTitle; 
    @SerializedName("name") 
    private String mName; 
    @SerializedName("num_children") 
    private Long mNumChildren; 
    @SerializedName("page_description") 
    private String mPageDescription; 
    @SerializedName("page_title") 
    private String mPageTitle; 
    @SerializedName("short_name") 
    private String mShortName; 

    public Long getCategoryId() { 
     return mCategoryId; 
    } 

    public void setCategoryId(Long category_id) { 
     mCategoryId = category_id; 
    } 

    public String getCategoryName() { 
     return mCategoryName; 
    } 

    public void setCategoryName(String category_name) { 
     mCategoryName = category_name; 
    } 

    public String getLongName() { 
     return mLongName; 
    } 

    public void setLongName(String long_name) { 
     mLongName = long_name; 
    } 

    public String getMetaDescription() { 
     return mMetaDescription; 
    } 

    public void setMetaDescription(String meta_description) { 
     mMetaDescription = meta_description; 
    } 

    public String getMetaKeywords() { 
     return mMetaKeywords; 
    } 

    public void setMetaKeywords(String meta_keywords) { 
     mMetaKeywords = meta_keywords; 
    } 

    public String getMetaTitle() { 
     return mMetaTitle; 
    } 

    public void setMetaTitle(String meta_title) { 
     mMetaTitle = meta_title; 
    } 

    public String getName() { 
     return mName; 
    } 

    public void setName(String name) { 
     mName = name; 
    } 

    public Long getNumChildren() { 
     return mNumChildren; 
    } 

    public void setNumChildren(Long num_children) { 
     mNumChildren = num_children; 
    } 

    public String getPageDescription() { 
     return mPageDescription; 
    } 

    public void setPageDescription(String page_description) { 
     mPageDescription = page_description; 
    } 

    public String getPageTitle() { 
     return mPageTitle; 
    } 

    public void setPageTitle(String page_title) { 
     mPageTitle = page_title; 
    } 

    public String getShortName() { 
     return mShortName; 
    } 

    public void setShortName(String short_name) { 
     mShortName = short_name; 
    } 

} 

Ошибка:

FATAL EXCEPTION: main 
                    Process: pc.dd.vegetables_simple, PID: 4255 
                    java.lang.IllegalArgumentException: API declarations must be interfaces. 
                     at retrofit2.Utils.validateServiceInterface(Utils.java:309) 
                     at retrofit2.Retrofit.create(Retrofit.java:128) 
                     at pc.dd.vegetables_simple.Fragments.CategoryFragment.<init>(CategoryFragment.java:42) 
                     at pc.dd.vegetables_simple.Adapters.PagerAdapterVeg.getItem(PagerAdapterVeg.java:23) 
                     at android.support.v4.app.FragmentStatePagerAdapter.instantiateItem(FragmentStatePagerAdapter.java:109) 
                     at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:1006) 
                     at android.support.v4.view.ViewPager.populate(ViewPager.java:1154) 
                     at android.support.v4.view.ViewPager.populate(ViewPager.java:1088) 
                     at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1614) 
                     at android.view.View.measure(View.java:19863) 
                     at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715) 
                     at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461) 
                     at android.view.View.measure(View.java:19863) 
                     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120) 
                     at android.widget.FrameLayout.onMeasure(FrameLayout.java:185) 
                     at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) 
                     at android.view.View.measure(View.java:19863) 
                     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120) 
                     at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:389) 
                     at android.view.View.measure(View.java:19863) 
                     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120) 
                     at android.widget.FrameLayout.onMeasure(FrameLayout.java:185) 
                     at android.view.View.measure(View.java:19863) 
                     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120) 
                     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464) 
                     at android.widget.LinearLayout.measureVertical(LinearLayout.java:758) 
                     at android.widget.LinearLayout.onMeasure(LinearLayout.java:640) 
                     at android.view.View.measure(View.java:19863) 
                     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120) 
                     at android.widget.FrameLayout.onMeasure(FrameLayout.java:185) 
                     at com.android.internal.policy.DecorView.onMeasure(DecorView.java:689) 
                     at android.view.View.measure(View.java:19863) 
                     at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2270) 
                     at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1366) 
                     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1619) 
                     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1254) 
                     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6306) 
                     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874) 
                     at android.view.Choreographer.doCallbacks(Choreographer.java:686) 
                     at android.view.Choreographer.doFrame(Choreographer.java:621) 
                     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860) 
                     at android.os.Handler.handleCallback(Handler.java:751) 
                     at android.os.Handler.dispatchMessage(Handler.java:95) 
                     at android.os.Looper.loop(Looper.java:154) 
                     at android.app.ActivityThread.main(ActivityThread.java:6095) 
                     at java.lang.reflect.Method.invoke(Native Method) 
                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 

Iam серьезно косяка understant Уотс неправильно. Вы можете помочь мне, ребята?

Answer 1

CategoryJsonParser categoryParsed = retrofit.create(CategoryJsonParser.class); // this line error 

Да, это должно быть интерфейс.

InterfaceForCategory categoryService = retrofit.create(InterfaceForCategory.class); // this line is good 
categoryService.getData().enqueue(new Callback<>(){...}); 

Но я уверен, что the official documentation explains this sufficiently well.

Answer 2

вам нужно что-то вроде:

InterfaceForCategory myService = retrofit.create(InterfaceForCategory.class); 

Answer 3

Ваш класс реализации апи (GitHubService.class) должен быть интерфейс здесь:

GitHubService service = retrofit.create(GitHubService.class); 

Посмотрите на официальные ДООСНАСТКЕ документы here.

Или проверьте образец here.

API-интерфейс образца:

public interface GitApiInterface { 

     @Headers("User-Agent: Retrofit2.0Tutorial-App") 
     @GET("/search/users") 
     Call<GitResult> getUsersNamedTom(@Query("q") String name); 

     @POST("/user/create") 
     Call<Item> createUser(@Body String name, @Body String email); 

     @PUT("/user/{id}/update") 
     Call<Item> updateUser(@Path("id") String id , @Body Item user); 
    }