Android——MVP架构

MVC和MVP的区别

MVC（Model View Controller),Model就是模型、View是视图、Controller就是控制器,（对应于Activity）。
Model在MVC架构中是真正的业务逻辑实现层，所以Model实际上是Business Model(业务模型)。而Controller主要负责把View的请求转发给Model,再把Model处理结果通知给View，Controller是用来解耦View和Model的，目的就是实现UI和逻辑的分离。
在实际的程序中，数据绑定、事件的处理都是在Activity中，导致Activity很复杂。此外，MVC的设计思想是从Model出发，没有考虑到View端的复杂性，这样的结果就是Model难以负荷复杂多变的View端。
MVP（Model View Presenter）,其中presenter完全将Model和View进行分离，主要的逻辑程序在Presenter中实现。而且Presenter与具体的View没有直接的关联，而是通过定义好的接口进行交互，从而在保证Presenter的不变，即重用。在MVP中可以修改视图而不影响模型，所有的交互都发生在presenter内部。
MVP相对于MVC的好处：MVC中允许View和Model交互，而在MVC中两者之间的交互时通过presenter完成的。

通过例子学习：
布局：
activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity" android:orientation="vertical">   <RelativeLayout  android:layout_width="match_parent" android:layout_height="wrap_content" >       <TextView  android:id="@+id/name_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:text="用户名" />       <EditText  android:id="@+id/name_edit" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_toRightOf="@id/name_text"/>   </RelativeLayout>    <RelativeLayout  android:layout_width="match_parent" android:layout_height="wrap_content" >        <TextView  android:id="@+id/password_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:text=" 密码 " />        <EditText  android:id="@+id/password_edit" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_toRightOf="@id/password_text"/>    </RelativeLayout>    <RelativeLayout  android:layout_width="match_parent" android:layout_height="wrap_content" >        <Button  android:id="@+id/login_button" android:layout_width="120dp" android:layout_height="wrap_content" android:text="Login" android:layout_alignParentTop="true" android:layout_alignParentStart="true" android:layout_marginStart="39dp" />        <Button  android:id="@+id/clear_button" android:layout_width="120dp" android:layout_height="wrap_content" android:text="Clear" android:layout_alignParentTop="true" android:layout_alignParentEnd="true" android:layout_marginEnd="34dp"/>    </RelativeLayout>    <ProgressBar  android:id="@+id/progressBar" android:layout_width="match_parent" android:layout_height="wrap_content" /></LinearLayout>

Model:
User

public class User {    private String userName;    private String password;    public String getUserName() {        return userName;    }    public void setUserName(String userName) {        this.userName = userName;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }}

IUserBiz

public interface IUserBiz {    public void login(String userName,String password,OnLoginListener loginListener);}

OnLoginListener:

public interface OnLoginListener {    void loginSuccess(User user);    void loginFailed();}

UserBiz

public class UserBiz implements IUserBiz {    @Override    public void login(final String userName, final String password, final OnLoginListener loginListener) {        new Thread(new Runnable() {            @Override            public void run() {                if("lcy".equals(userName)&&"123".equals(password)){                    User user=new User();                    user.setPassword(password);                    user.setUserName(userName);                    loginListener.loginSuccess(user);                }else{                    loginListener.loginFailed();                }            }        }).start();    }}

View:
IUserView

public interface IUserLoginView {    String getUserName();    String getPassWord();    void clearUserName();    void clearPassWord();    void showLoading();    void hideLoading();    void toMainActivity(User user);    void showFailedError();}

MainActivity

public class MainActivity extends AppCompatActivity implements IUserLoginView{    private EditText nameText;    private EditText passwordText;    private Button loginButton;    private Button clearButton;    private ProgressBar progressBar;    private UserLoginPresenter userLoginPresenter=new UserLoginPresenter(this);    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initViews();    }    void initViews(){        nameText= (EditText) findViewById(R.id.name_edit);        passwordText=(EditText)findViewById(R.id.password_edit);        loginButton=(Button)findViewById(R.id.login_button);        clearButton=(Button)findViewById(R.id.clear_button);        progressBar=(ProgressBar)findViewById(R.id.progressBar);        loginButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                 userLoginPresenter.login();            }        });        clearButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                 userLoginPresenter.clear();            }        });    }    @Override    public String getUserName() {        return nameText.getText().toString();    }    @Override    public String getPassWord() {        return passwordText.getText().toString();    }    @Override    public void clearUserName() {         nameText.setText("");    }    @Override    public void clearPassWord() {        passwordText.setText("");    }    @Override    public void showLoading() {        progressBar.setVisibility(View.VISIBLE);    }    @Override    public void hideLoading() {       progressBar.setVisibility(View.GONE);    }    @Override    public void toMainActivity(User user) {        Toast.makeText(this, user.getUserName() +                " login success , to MainActivity", Toast.LENGTH_SHORT).show();    }    @Override    public void showFailedError() {        Toast.makeText(this,                "login failed", Toast.LENGTH_SHORT).show();    }}

Presenter

public class UserLoginPresenter {    private IUserLoginView userLoginView;    private IUserBiz userBiz;    private Handler mHandler=new Handler();    public UserLoginPresenter(IUserLoginView userLoginView){        this.userLoginView=userLoginView;        this.userBiz=new UserBiz();    }    public void login(){        userLoginView.showLoading();        userBiz.login(userLoginView.getUserName(), userLoginView.getPassWord(), new OnLoginListener() {            @Override            public void loginSuccess(final User user) {                mHandler.post(new Runnable() {                    @Override                    public void run() {                        userLoginView.toMainActivity(user);                        userLoginView.hideLoading();                    }                });            }            @Override            public void loginFailed() {                   mHandler.post(new Runnable() {                       @Override                       public void run() {                           userLoginView.showFailedError();                           userLoginView.hideLoading();                       }                   });            }        });    }    public void clear(){        userLoginView.clearPassWord();        userLoginView.clearUserName();    }}

参考：http://www.cnblogs.com/JustRun1983/p/3727560.html
http://blog.csdn.net/lmj623565791/article/details/46596109

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