封装MvpFragment以及MvpPresenter，简化MVP的构建，达到偷懒的目的。 可以参考之前的另一篇文章: Android Mvp实践
最终使用效果
Fragment和Presenter只需分别继承MvpFragmen、MvpPresenter即可进行绑定。 ### Activity Activity容器,里面放置了两个Fragment，在activity中将Fragment和其present绑定。 ```java @EActivity(R.layout.activity_main) public class MainActivity extends AppCompatActivity { FragmentManager fm; private Fragment mFragmentNow; MapFragment mapFragment = new MapFragment_(); UserFragment userFragment = new UserFragment_();
@Bean
MapPresenter mapPresenter;
@Bean
UserPresenter userPresenter;
@AfterViews
void init() {
setDefaultFragment();
mapPresenter.setView(this, mapFragment); //view和presenter绑定
userPresenter.setView(this, userFragment);//view和presenter绑定
}
private void setDefaultFragment() {
fm = getFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
transaction.add(R.id.fragcontent, mapFragment);
transaction.commit();
mFragmentNow = mapFragment;
}
private void switchContent(Fragment from, Fragment to) {
if (mFragmentNow != to) {
mFragmentNow = to;
FragmentTransaction transaction = fm.beginTransaction();
if (!to.isAdded()) { // 先判断是否被add过
transaction.hide(from).add(R.id.fragcontent, to).commit(); // 隐藏当前的fragment，add下一个到Activity中
} else {
transaction.hide(from).show(to).commit(); // 隐藏当前的fragment，显示下一个
}
}
} //点击切换fragment略.. } ``` ### Contract Presenter和View的接口 ```java public class MapContract {
public interface View extends BaseView<Presenter> {
//...
}
public interface Presenter extends BasePresenter {
//...
}
}
### View层
java
@EFragment(R.layout.fragment_map)
public class MapFragment extends MvpFragment
实现过程
### base类
java
public interface BaseView<T> {
void setPresenter(T presenter);
}
public interface BasePresenter {
}
MvpFragment
通过泛型传入Presenter，并覆写BaseView中的setPresenter ```java public class MvpFragment <P extends BasePresenter> extends Fragment implements BaseView<P>{ public P mPresenter;
@Override
public void setPresenter(BasePresenter presenter) {
if (presenter != null)
mPresenter = (P) presenter;
} } ``` ### MvpPresenter 通过泛型传入BaseView,实现setView方法 ```java public class MvpPresenter <V extends BaseView> {
public Context context;
public V mView;
public void setView(Context context, V mView) {
this.context = context;
this.mView = mView;
mView.setPresenter(this);
}
} ``` ### 小结 通过以上方法，Activity中调用mapPresenter.setView(this, mapFragment)将view传入，而在setView中又调用setPresenter将view和Presenter绑定，于是可以在view层和presenter调用相关接口。