而在MVP模式中，处理复杂逻辑的Presenter是通过interface与View(Activity)进行交互的，这说明了什么？说明我们能够通过自己定义类实现这个interface来模拟Activity的行为对Presenter进行单元測试，省去了大量的部署及測试的时间。
有一些程序猿选择不使用不论什么一种模式，有一部分原因或许就是不能区分这两种模式差异。下面是这两种模式之间最关键的差异：
public class UserBean {
private String mFirstName ;
private String mLastName ;
public UserBean (String firstName, String lastName) {
this .mFirstName = firstName;
this .mLastName = lastName;
}
public String getFirstName() {
return mFirstName ;
}
public String getLastName() {
return mLastName ;
}
}
public interface IUserView {
int getID();
String getFristName();
String getLastName();
void setFirstName (String firstName);
void setLastName (String lastName);
}
public interface IUserModel {
void setID (int id);
void setFirstName (String firstName);
void setLastName (String lastName);
int getID();
UserBean load (int id);//通过id读取user信息,返回一个UserBean
}
public class UserPresenter {
private IUserView mUserView ;
private IUserModel mUserModel ;
public UserPresenter (IUserView view) {
mUserView = view;
mUserModel = new UserModel ();
}
public void saveUser( int id , String firstName , String lastName) {
mUserModel .setID (id );
mUserModel .setFirstName (firstName );
mUserModel .setLastName (lastName );
}
public void loadUser( int id ) {
UserBean user = mUserModel .load (id );
mUserrView .setFirstName (user .getFirstName ());//通过调用IUserView的方法来更新显示
mUserView .setLastName (user .getLastName ());
}
}
public class UserActivity extends Activity implements OnClickListener ,
IUserView {
private EditText mFirstNameEditText , mLastNameEditText , mIdEditText ;
private Button mSaveButton , mLoadButton ;
private UserPresenter mUserPresenter ;
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch ( v. getId()) {
case R .id .saveButton :
mUserPresenter .saveUser (getID (), getFristName (),
getLastName ());
break ;
case R .id .loadButton :
mUserPresenter .loadUser (getID ());
break ;
default :
break ;
}
}
原文：http://www.cnblogs.com/bhlsheji/p/5176205.html