Android - Java等效的iOS块回调？

Question

在我的Android应用程序中,当我从后端读取段落时,我想实现成功和错误回调.在iOS中,它看起来像这样:

在我的Passage.h中:

-(void)getPassagesWithSuccessCallback:(void (^)(NSArray<Passage *> *))success errorCallback:(void (^)(NSString *))errorString;

在我的Passage.m中:

-(void)getPassagesWithSuccessCallback:(void (^)(NSArray<Passage *> *))success errorCallback:(void (^)(NSString *))errorString {
    MyApiInterface* api = [MyApiInterface sharedInstance];
    [api sendGetRequestTo:@"passages" successCallback:[Passage modelListCallback:success] errorCallback:error];
}

在我的Android应用程序中,我正在使用Volley处理我的API请求,但我希望通过使用Passage.java类以及public static void获取段落的方法来进一步封装此API接口.像这样的东西:

public static void getPassagesForFirebaseUser(FirebaseUser user, Context context) {
        final String url = URL_BASE + "/passages.json" + "?auth=" + user.getToken(false);
        final JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                // convert JSON into ArrayList<Passage> object
                // pass on this array of Passages in the success completion listener of the method that called this
                // just like iOS does success(passages)
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                // convert error to string
                // pass on this errorString in the error completion listener of the method that called this
                // just like iOS does error(errorString)
            }
        });
        Volley.newRequestQueue(context).add(request);
}

有没有办法让这种实现流程？

Answer 1

您可以使用界面

public interface ICallbacks { 
    public void onResponse(JSONObject response);
    public void onError(VolleyError error);
}

然后在你的例程代码中添加一个新的Callbacks实例(取决于你工作的ide可以自动生成方法)

public static void getPassagesForFirebaseUser(FirebaseUser user,
Context context, ICallbacks events) { 
//here code and call ICallbacks methods
if(result){ events.onResponse(response); }
if(error){ events.onError(err); }
}

最终你可以调用方法:

getPassagesForFirebaseUser(user, context, new ICallbacks(){
    @Override
    public void onResponse(JSONObject response){
        //Success !!!
    }
    @Override
    public void onError(VolleyError response){
        //Error !!!
    }
});

对不起我的英文,希望对你有所帮助!