谷歌官方MVP架构学习_google mvvm架构学习-优快云博客

本文链接：https://blog.youkuaiyun.com/TS_learner/article/details/71603407

本文深入探讨了MVC设计模式中的核心概念，通过具体的代码示例介绍了如何使用Fragment作为视图部分，并展示了Presenter如何与View交互以实现业务逻辑。此外，还提供了一个简单的Activity示例，用于说明组件间的集成。

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Contract封装了View和Presenter 




public interface TasksContract {

    interface View extends BaseView<Presenter> {

        void setLoadingIndicator(boolean active);

        void showTasks(List<Task> tasks);

        void showAddTask();

        void showTaskDetailsUi(String taskId);

        void showTaskMarkedComplete();

        void showTaskMarkedActive();

        void showCompletedTasksCleared();

        void showLoadingTasksError();

        void showNoTasks();

        void showActiveFilterLabel();

        void showCompletedFilterLabel();

        void showAllFilterLabel();

        void showNoActiveTasks();

        void showNoCompletedTasks();

        void showSuccessfullySavedMessage();

        boolean isActive();

        void showFilteringPopUpMenu();
    }

    interface Presenter extends BasePresenter {

        void result(int requestCode, int resultCode);

        void loadTasks(boolean forceUpdate);

        void addNewTask();

        void openTaskDetails(@NonNull Task requestedTask);

        void completeTask(@NonNull Task completedTask);

        void activateTask(@NonNull Task activeTask);

        void clearCompletedTasks();

        void setFiltering(TasksFilterType requestType);

        TasksFilterType getFiltering();
    }
}

//BaseView.java
public interface BaseView<T> {

    void setPresenter(T presenter);

}

//BasePresenter.java
public interface BasePresenter {

    void start();

}



Google将Fragment看作一个V而不是Activity，所以这里用Fragment来实现V接口。


public class ShowActivity extends BaseActivity {

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_show_fragment);
    }

    @Override
    protected void findViews() {

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_user_profile, menu);
        return true;
    }

    @Override
    protected void init() {
        UserProfileShowFragment fragment =
                (UserProfileShowFragment) getSupportFragmentManager().findFragmentById(R.id.contentFrame);
        if (fragment == null) {
            fragment = UserProfileShowFragment.newInstance();
            ActivityUtils.addFragmentToActivity(getSupportFragmentManager(),
                    fragment, R.id.contentFrame);
        }
        UserProfileShowPresenter presenter = new UserProfileShowPresenter(fragment, this);
        fragment.setPresenter(presenter);
    }
}




public class UserProfileShowFragment extends BaseFragment implements UserProfileShowContract.View {

   

    private UserProfileShowContract.Presenter mPresenter;

    public static UserProfileShowFragment newInstance() {
        Bundle args = new Bundle();
        UserProfileShowFragment fragment = new UserProfileShowFragment();
        fragment.setArguments(args);
        return fragment;
    }

    public void setPresenter(@NonNull UserProfileShowContract.Presenter presenter) {
        mPresenter = presenter;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <FrameLayout
        android:id="@+id/contentFrame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/id_toolbar"></FrameLayout>

</RelativeLayout>