避免重复的翻新回调

Question

我在我最新的Android应用程序中使用Retrofit实施了Facebook登录。在SplashActivity和LoginActivity，我想让我的POST请求：

FacebookLoginInfo facebookLoginInfo = new FacebookLoginInfo(token); 
Call<User> call = ApiManager.getService().authenticateFacebookUser(facebookLoginInfo); 
call.enqueue(userCallback); 

FacebookLoginInfo是一个简单的POJO与Facebook的访问令牌。 ApiManager是我的服务的单例类。

我的问题是，userCallback在SplashActivity和LoginActivity中重复。有没有最佳做法来定义此回调只有一次？用户回调

---

定义：

private Callback<User> mUserCallback = new Callback<User>() { 
    @Override 
    public void onResponse(Call<User> call, Response<User> response) { 
     dismissProgressDialog(); 

     int statusCode = response.code(); 
     if (statusCode == 200) { 
      User user = response.body(); 
      Log.e(LOG_TAG, "user: " + user.toString()); 

      Intent intent = new Intent(LoginActivity.this, MainActivity.class); 
      intent.putExtra(Global.EXTRA_USER, user); 
      startActivity(intent); 
     } else if (statusCode == 400) { 
      Toast.makeText(LoginActivity.this, getString(R.string.error_token_required), Toast.LENGTH_SHORT).show(); 
     } else if (statusCode == 403) { 
      Toast.makeText(LoginActivity.this, getString(R.string.error_invalid_token), Toast.LENGTH_SHORT).show(); 
     } 
    } 

    @Override 
    public void onFailure(Call<User> call, Throwable t) { 
     dismissProgressDialog(); 
     t.printStackTrace(); 
     Toast.makeText(LoginActivity.this, getString(R.string.error_call_failed), Toast.LENGTH_SHORT).show(); 
    } 
}; 

Answer 1

您可以创建一个名为UserCallback类，它实现回调并在您想要使用它。

你的情况

：

public class UserCallback implements Callback<EventResponseList> { 
@Override 
    public void onResponse(Call<User> call, Response<User> response) { 
     dismissProgressDialog(); 

     int statusCode = response.code(); 
     if (statusCode == 200) { 
      User user = response.body(); 
      Log.e(LOG_TAG, "user: " + user.toString()); 

      Intent intent = new Intent(LoginActivity.this, MainActivity.class); 
      intent.putExtra(Global.EXTRA_USER, user); 
      startActivity(intent); 
     } else if (statusCode == 400) { 
      Toast.makeText(LoginActivity.this, getString(R.string.error_token_required), Toast.LENGTH_SHORT).show(); 
     } else if (statusCode == 403) { 
      Toast.makeText(LoginActivity.this, getString(R.string.error_invalid_token), Toast.LENGTH_SHORT).show(); 
     } 
    } 

    @Override 
    public void onFailure(Call<User> call, Throwable t) { 
     dismissProgressDialog(); 
     t.printStackTrace(); 
     Toast.makeText(LoginActivity.this, getString(R.string.error_call_failed), Toast.LENGTH_SHORT).show(); 
    } 
} 

，当你想使用它：

FacebookLoginInfo facebookLoginInfo = new FacebookLoginInfo(token); 
Call<User> call = ApiManager.getService().authenticateFacebookUser(facebookLoginInfo); 
call.enqueue(new UserCallback());