改型和集中错误处理

Question

public abstract class BaseAsyncTask<Params, Progress, Result> extends AsyncTask<Params, Progress, Result> {

    protected Context context;
    private ProgressDialog progressDialog;
    private Result result;

    protected BaseAsyncTask(Context context, ProgressDialog progressDialog) {
        this.context = context;
        this.progressDialog = progressDialog;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected void onPostExecute(Result result) {
        super.onPostExecute(result);
        HttpResponse<ErrorResponse> response = (HttpResponse<ErrorResponse>) result;
     if(response.getData().getErrorCode() != -1) {
                handleErrors(response.getData());
        }else 
            onResult(result);

    }

    private void handleErrors(ErrorResponse errorResponse) {
    }
     public abstract void onResult(Result result);
    }

但是，使用retrofit每个请求都有其错误处理回调：

                    git.getFeed(user,new Callback<gitmodel>() {
                    @Override
                    public void success(gitmodel gitmodel, Response response) {

                    }

                    @Override
                    public void failure(RetrofitError error) {

                    }
                });
            }
        });

我如何在一个地方处理所有错误？

Answer 1

如果您需要得到一些“逻辑”错误，那么您需要一些Java逻辑，因为它不是一个改型特性，所以基本上：

1. 创建实现翻新回调的实现回调
2. 创建定义方法“is error”的基对象
3. 修改Restfit RestAdapter，以便获得您的回调而不是Restfit一个
   

MyCallback.java

import android.util.Log;
import retrofit.Callback;
import retrofit.client.Response;

public abstract class MyCallback<T extends MyObject> implements Callback<T> {

    @Override
    public final void success(T o, Response response) {
        if (o.isError()) {
            // [..do something with error]
            handleLogicError(o);
        }
        else {
            handleSuccess(o, response);
        }
    }

    abstract void handleSuccess(T o, Response response);

    void handleLogicError(T o) {
        Log.v("TAG", "Error because userId is " + o.id);
    }
}

public class MyObject {
    public long id;
    public boolean isError() {
        return id == 1;
    }
}

public class MyRealObject extends MyObject {
    public long userId;
    public String title;
    public String body;
}

java-retroInterface.java-您应该熟悉的retrofit使用的接口

import retrofit.http.GET;
import retrofit.http.Path;

public interface RetroInterface {

    @GET("/posts/{id}")
    void sendGet(@Path("id") int id, MyCallback<MyRealObject> callback);

}

最后是一段使用所有逻辑的代码

RestAdapter adapter = new RestAdapter.Builder()
    .setEndpoint("http://jsonplaceholder.typicode.com")
    .build();

RetroInterface itf = adapter.create(RetroInterface.class);
itf.sendGet(2, new MyCallback<MyRealObject>() {
    @Override
    void handleSuccess(MyRealObject o, Response response) {
        Log.v("TAG", "success");
    }

    @Override
    public void failure(RetrofitError error) {
        Log.v("TAG", "failure");
    }
});

如果复制并粘贴此代码，则在执行ITF.Sendget(1,new MyCallback..）时将出现错误，执行ITF.Sendget(2,new MyCallback...）时将获得成功