如何从回调函数返回某些内容给父函数

Question

这就是我要做的UploadCompleteListener 是一个充当回调的自定义接口。@Overriderpublic Result doWork() {        mUpLoadDataService.uploadInspectionData(new UpLoadDataService.UploadCompleteListener() {            @Override            public void uploadComplete() {                    return Result.success(); //this is what I want to do            }            @Override            public void uploadFailed(String reason) {                return Result.failure(); //this is what I want to do            }        });        return null;    }是否可以？如果可能的话，请尽快回复。如果您需要，我可以提供更多详细信息。

Answer 1

** 这对我有用 **

 @NonNull

    @Override

    public Result doWork() {

        final Result[] result = new Result[1];

        mUpLoadDataService.uploadInspectionData(new UpLoadDataService.UploadCompleteListener() {

            @Override

            public void uploadComplete() {

                    result[0] = Result.success(); //this is what I want to do

            }

            @Override

            public void uploadFailed(String reason) {

                result[0] = Result.failure(); //this is what I want to do

            }

        });

        return result[0];

    }

Answer 2

  public Result doWork(UpLoadDataService.UploadCompleteListener uploadListener) {

    mUpLoadDataService.uploadInspectionData(uploadListener);

    return null;

}

现在传递父函数的实现。假设你的父函数被命名为foobar

void foobar() {

   someObject.doWork(new UpLoadDataService.UploadCompleteListener() {

   @Override

   public void uploadComplete() {

       //write your logic here

       return Result.success(); 

   }

   @Override

   public void uploadFailed(String reason) {

       //write your logic here

       return Result.failure(); 

   }

   });

}

Answer 3

您可以使用以下方式获取任务的回调

 doWork(paremter, new ServiceListener<String>() { //paremter if any

        @Override

        public void success(String obj) {

            //get the response if success

        }

        @Override

        public void fail(ServiceError error) {

            //get the error response

        }

    });

完成工作并从调用的地方发送调用响应

 private void doWork(String param , ServiceListener<String> serviceListener) {

    mUpLoadDataService.uploadInspectionData(new UpLoadDataService.UploadCompleteListener() {

        @Override

        public void uploadComplete() {

            serviceListener.success("success");

        }

        @Override

        public void uploadFailed(String reason) {

            serviceListener.fail(new ServiceError("Can not Upload"));

        }

    });

}

ServiceListener接口定义如下

public interface ServiceListener<T> {

    void success(T obj);

    void fail(ServiceError error);

}

public class ServiceError {

    public Throwable errorObject;

    public String message;

    public ServiceError(){

        message = "";

    }

    public ServiceError(String message){

        this.message = message;

    }

    public ServiceError(String message, Throwable errorObject){

        this.message = message;

        this.errorObject = errorObject;

    }

    public Object getErrorObject() {

        return errorObject;

    }

    public void setErrorObject(Throwable errorObject) {

        this.errorObject = errorObject;

    }

    public String getMessage() {

        return message;

    }

    public void setMessage(String message) {

        this.message = message;

    }

}

Answer 4

您可以EventBus在您想要的每个地方使用通知订阅方法，如下所示：

public class MessageEvent {

    public final String message;

    public MessageEvent(String message) {

        this.message = message;

    }

}

public void doWork() {

        mUpLoadDataService.uploadInspectionData(new UpLoadDataService.UploadCompleteListener() {

            @Override

            public void uploadComplete() {

                    EventBus.getDefault().post(new MessageEvent("success"));

            }

            @Override

            public void uploadFailed(String reason) {

                    EventBus.getDefault().post(new MessageEvent("failed"));

            }

        });

    }

@Subscribe(threadMode = ThreadMode.MAIN)

public void onMessageEvent(MessageEvent event) {

    Toast.makeText(getActivity(), event.message, Toast.LENGTH_SHORT).show();

}

请参阅本实施指南。