Android 项目架构 MVP架构

package com.test.mvp; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import java.lang.reflect.ParameterizedType; import java.lang.reflect.Type; interface BaseView { /** * 判断宿主是否还存活，避免NPE * * @return */ boolean isAlive(); } class BasePresenter<IView extends BaseView> { /** * 根据MVP的模型，Presenter需要持有View对象，才能将处理好的数据回调出去 */ public IView mView; public void attach(IView mView) { this.mView = mView; } public void detach() { this.mView = null; } } /** * 定义业务接口 */ interface HomeContract { interface View extends BaseView { void onGetuserInfo(Object data, String errorMsg); void onSaveUserInfo(Object data, String errorMsg); } /** * 每个接口 都会在View 存在与之对应的callback回调 */ abstract class Presenter extends BasePresenter<View> { public abstract void getUserInfo(); public abstract void saveUserInfo(); } } class HomePresenter extends HomeContract.Presenter { @Override public void getUserInfo() { if (mView != null && mView.isAlive()) { mView.onGetuserInfo(null, null); } } @Override public void saveUserInfo() { } } public class MainActivity extends AppCompatActivity implements HomeContract.View { private HomePresenter presenter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); presenter = new HomePresenter(); presenter.attach(this); presenter.getUserInfo(); } @Override public boolean isAlive() { /** * 当前Activity（宿主）是否存活 */ return (!isDestroyed() && !isFinishing()); } @Override protected void onDestroy() { super.onDestroy(); /** * 释放掉IView */ presenter.detach(); } @Override public void onGetuserInfo(Object data, String errorMsg) { } @Override public void onSaveUserInfo(Object data, String errorMsg) { } } class MainActivity1 extends BaseActivity<HomePresenter> implements HomeContract.View { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mPresenter.getUserInfo(); } @Override public void onGetuserInfo(Object data, String errorMsg) { } @Override public void onSaveUserInfo(Object data, String errorMsg) { } } class BaseActivity<P extends BasePresenter> extends AppCompatActivity implements BaseView { protected P mPresenter; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); Type superClass=this.getClass().getGenericSuperclass(); //具备泛型参数的类型 if(superClass instanceof ParameterizedType){ Type[] arguments = ((ParameterizedType) superClass).getActualTypeArguments(); if(arguments!=null&&arguments[0] instanceof BasePresenter){ try{ mPresenter= (P) arguments[0].getClass().newInstance(); mPresenter.attach(this); }catch (IllegalAccessException e){ e.printStackTrace(); }catch (InstantiationException e){ e.printStackTrace(); } } } } @Override public boolean isAlive() { return (!isDestroyed() && !isFinishing()); } @Override protected void onDestroy() { super.onDestroy(); if(mPresenter!=null){ mPresenter.detach(); } } }