我'm trying to set up a tabbed layout with MVP and having some difficulties. I' m使用Google's Dagger MVP sample app作为一般参考,并且它们存储每个活动中每个演示者的引用 . 但是,在我的选项卡式布局中,我是'm using one activity with a fragment for each tab (delivered via a FragmentPagerAdapter). The fragments are instantiated and their presenters injected in the FragmentPagerAdapter'的getItem()方法 . 问题是,当应用程序被旋转时,我的片段会自动重建,但不要将演示者存储为活动或FragmentPagerAdapter(谷歌)中的字段,但无论如何都不能正常工作 .
这基本上就是我现在在FragmentPagerAdapter中的做法:
public class MyFragmentPagerAdapter extends FragmentPagerAdapter {
@Inject MyPresenter mMyPresenter;
@Override
public Fragment getItem (int position){
switch (position) {
case MY_FRAGMENT_INDEX:
return createMyFragment;
case OTHER_FRAGMENT_INDEX:
return createMyOtherFragment;
default:
return null;
}
private Fragment createMyFragment() {
MyFragment myFragment = MyFragment.newInstance();
// make the presenter
DaggerMyPresenterComponent.builder()
.MyModelComponent(
((MyApplication) getApplication()).getMyModelComponent())
.MyPresenterModule(new MyPresenterModule(myFragment)).build()
.inject(this);
return myFragment;
}
处理这种情况的好架构是什么?我应该在哪里保留对演示者的引用(如果有的话),以及如何管理他们的实例化和重新创建(如果FragmentPagerAdapter不会为我做这些)?