MVP与MVP+Dagger2的使用及比较

MVP初体验与MVP引入Dagger2初体验

Mvp模式理解
一、分析Presenter层
1.1 Presenter 注入 实现接口IView的Acticity

public class MainActivity extends AppCompatActivity implements View.OnClickListener, IUserLoginView {    ...    private void loadData() {        mLoginPresenter = new LoginPresenter();        mLoginPresenter.attachView(this);    }     ...}

1.2 Presenter 构造中创建Model层

public class LoginPresenter extends BasePresenter<IUserLoginView> {    private LoginTasksRepository mLoginTasksRepository;    public LoginPresenter() {        mLoginTasksRepository = new LoginTasksRepository();    }    Login();--}

1.3 Presenter 中处理当前Activity中的事件，如登陆事件Login
下图分析：调用model层方法Login，处理网络请求，返回结果，view层响应事件

public void login(String loginReq){    mLoginTasksRepository.login(loginReq, new LoginTaskDataSource.NetTasksCallback() {        @Override        public void onSuccess(LoginResponse loginResponse) {            mvpView.hideLoading();            mvpView.onSuccess(loginResponse);        }        @Override        public void onFailure(String errorMsg) {        }    });}public abstract class BasePresenter<V extends IMvpView> implements Presenter<V> {    protected V mvpView;    public void attachView(V view){        mvpView = view;    }    @Override    public void detachView(V view) {        mvpView = null;    }    @Override    public String getName() {        return mvpView.getClass().getSimpleName();    }}public interface Presenter<V> {    void attachView(V view);    void detachView(V view);    String getName();}

二、分析Model层
2.1 网络请求或数据库存储

public interface LoginTaskDataSource {    void saveLoginResponse(LoginResponse loginResponse);    void login(String loginReq, NetTasksCallback callback);    interface NetTasksCallback{        void onSuccess(LoginResponse loginResponse);        void onFailure(String errorMsg);    }}public class LoginTasksRepository implements LoginTaskDataSource {    @Override    public void saveLoginResponse(LoginResponse loginResponse) {    }    @Override    public void login(String loginReq, NetTasksCallback callback) {        //开启网络请求        //成功后        LoginResponse loginResponse = new LoginResponse();        loginResponse.setResultInfo(loginReq+"===登录成功");        loginResponse.setResultCode("0");        callback.onSuccess(loginResponse);    }}

三、分析View层
3.1 分析Activity中的具体方法，封装进接口，在loadData中注入。点击事件调用P层

public interface IMvpView {    void onError(String errorMsg, String code);    void onSuccess(LoginResponse loginResponse);    void showLoading();    void hideLoading();}public interface IUserLoginView extends IMvpView{    void clearEditContent();}public class MainActivity extends AppCompatActivity implements View.OnClickListener, IUserLoginView {    private EditText mUsername;    private EditText mPassword;    private Button mLogin;    private LoginPresenter mLoginPresenter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        loadData();    }    private void initView() {        mUsername = (EditText) findViewById(R.id.username);        mPassword = (EditText) findViewById(R.id.password);        mLogin = (Button) findViewById(R.id.login);        mLogin.setOnClickListener(this);    }    private void loadData() {        mLoginPresenter = new LoginPresenter();        mLoginPresenter.attachView(this);    }    @Override    public void onClick(View v) {        mLoginPresenter.login(mUsername.getText().toString() + "-" + mPassword.getText().toString());    }    @Override    public void clearEditContent() {        mUsername.setText("");        mPassword.setText("");    }    @Override    public void onError(String errorMsg, String code) {    }    @Override    public void onSuccess(LoginResponse loginResponse) {        Toast.makeText(this, loginResponse.getResultInfo(), Toast.LENGTH_SHORT).show();    }    @Override    public void showLoading() {    }    @Override    public void hideLoading() {    }    @Override    protected void onDestroy() {        mLoginPresenter.detachView(this);        super.onDestroy();    }}

3.2 当Destory时，需注销GC链，避免内存泄露

Mvp+ Dagger2模式理解

依赖

apply plugin: 'com.neenbedankt.android-apt'dependencies：apt 'com.google.dagger:dagger-compiler:2.2'compile 'com.google.dagger:dagger:2.2'

一、分析Presenter层
分析：一样也是P连接 M 和 V

public class MainPresenter implements MainContract.IPresenter {    private MainContract.IModel model;    private MainContract.IView view;    public MainPresenter(MainContract.IView view) {        this.view = view;        this.model = new MainModel();    }    @Override    public void onButtonClicked(Context context, String text) {        model.onButtonClicked(context,text);    }}

二、mvp接口类

public class MainContract {    interface IView{        void onButtonClicked(String text);    }    interface  IModel{        void onButtonClicked(Context context,String text);    }    interface IPresenter{        void onButtonClicked(Context context,String text);    }}

三、Model层

public class MainModel implements MainContract.IModel {    @Override    public void onButtonClicked(Context context, String text) {        Toast.makeText(context,text,Toast.LENGTH_SHORT).show();    }}

四、注入接口

@Singleton@Component(modules = MainModule.class)public interface MainComponent {    void inject(MainActivity activity);}

五、引入dagger2模式
分析：对应第六点的注入过程，给V提供P层对象

@Modulepublic class MainModule {    MainPresenter mPresenter;    public MainModule(MainActivity activity){        mPresenter = new MainPresenter(activity);    }    @Provides    @Singleton    MainPresenter providersMainPresenter(){        return mPresenter;    }}

六、View
分析：实现IView 接口，DaggerMainComponent注入（相对于MVP少了新建P层，调P层方法注入），点击调P层

public class MainActivity extends AppCompatActivity implements MainContract.IView {    @Inject    MainPresenter presenter;    @InjectView(R.id.btn)    Button mBtn;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ButterKnife.inject(this);        //这步之前需要rebuild一下        DaggerMainComponent.builder().mainModule(new MainModule(MainActivity.this)).build().inject(this);    }    @Override    public void onButtonClicked(String text) {        presenter.onButtonClicked(this,text);    }    @OnClick(R.id.btn)    public void onClick() {        onButtonClicked("Button Clicked!!!");    }}

两者之间的比较

简单的说，单纯使用MVP，代码结构清晰，注入Dagger2后，代码交接成本高，当然耦合是降低了，个人比较推荐使用MVP的。

感谢

MVP的学习一直都有，最近有时间，做一下总结，方便下个项目的使用，在这里感谢曹银飞顾林海等人的博客，对我的帮助挺大的。由于版权申明，不能转载博客。感谢大大。