我可以在Fragment中注册MVP Presenter吗 [英] Can I register MVP Presenter inside Fragment
问题描述
I've been following MVP design pattern provided by Google to refactor my application. I have one MainActivity and many Fragments and it seems little be messy for me to create an activity for every fragment, so I've been thinking to register presenter in fragment. What I'm seeing is that every fragment register its own presenter, but I'm not sure how much wrong it is... :)
这是我的主持人:
public class FirstPresenter implements FirstContract.Presenter {
private final FirstContract.View mView;
public FirstPresenter(FirstContract.View view) {
mView = view;
}
@Override
public void start() {
Log.e(TAG, "Start");
}
}
这是我的片段:
public class FirstFragment extends Fragment implements FirstContract.View {
private FirstContract.Presenter mPresenter;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container
, Bundle savedInstanceState) {
...
// I register firstFragment's presenter here.
mPresenter = new FirstPresenter(this);
...
所以我的问题是，这是正确的方法吗?是否可以在Activity中将Presenter注册到Fragment中?如果不是正确的方法，是否有一些很好的例子可以处理一个活动和多个片段的MVP?
So my question is, is this right way? Can I register Presenter into Fragment instead in Activity? And if it is not the right way, is there some good example to handle MVP with one activity and multiple fragments?
谢谢你们， BR！
推荐答案
如您在 Google的示例( https://github.com/googlesamples/android-architecture )，Activities创建Presenters.同样，将Views附加到Activity和Presenters以获得视图(Fragments)作为参数.
As you can see in Google's samples (https://github.com/googlesamples/android-architecture), Activities create Presenters. Also Views attach to Activity and Presenters get views (Fragments) as parameter.
在提交Fragment事务或恢复Fragment(视图)状态后，创建Presenters并以Fragments(视图)为参数，而不是调用
After Fragment transaction committed or Fragment (view) state restored Presenters get created and take Fragments (views) as parameter than call
view.setPresenter(T presenter);
视图方法和Presenters被注册以查看.
methods of views and Presenters get registered to view.
我认为在Fragment中创建Presenter不是一个好习惯.首先，它们是单独的图层.对于关注点分离，这是非法的.其次，如果您在Fragment中创建演示者，则将演示者的生活绑定到视图的LifeCycle，并且当销毁并重新创建Fragment时，您将创建一个新的演示者，但它们是不同的层.
I think creating Presenter in Fragment is not a good practice. First of all they are separate layers. This is illegal for Separation of concerns. And second, if you create presenter in Fragment, you bind your Presenter's life to view's LifeCycle and when Fragment is destroyed and recreated, you create a new presenter but they're different layers.
模型是定义要在用户界面中显示或以其他方式作用的数据的界面.
The model is an interface defining the data to be displayed or otherwise acted upon in the user interface.
演示者对模型和视图起作用.它从存储库(模型)中检索数据，并将其格式化以在视图中显示.
The presenter acts upon the model and the view. It retrieves data from repositories (the model), and formats it for display in the view.
视图是一个被动界面，用于显示数据(模型)并将用户命令(事件)路由到演示者以对该数据进行操作.
The view is a passive interface that displays data (the model) and routes user commands (events) to the presenter to act upon that data.
因此Activity可以充当overall controller来创建Presenters和Views并连接它们.
So Activity can act as an overall controller which creates the Presenters and Views and connect them.
如果我们谈论您的问题，是的，您可以分段注册演讲者.但是，您应该避免在用作视图的片段中创建演示者.
If we talk about your question, yes you can register presenter in fragment. But you should avoid creating presenters in fragments which you use as a view.
但是，关于Android社区中的MVP模式，有很多不同的方法，如下所示. https://plus.google.com/communities/114285790907815804707
But there're lot's of different approaches about MVP pattern in Android community like below. https://plus.google.com/communities/114285790907815804707
为什么活动不是ui元素? http://www.techyourchance.com/activities-android/
Why activities are not ui elements? http://www.techyourchance.com/activities-android/
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