android应用开发设计模式之代理模式
设计模式在软件设计中非常重要,目前发展中有23种模式,在android(java)中我们也有必要对其有一定的了解.在后面的学习中,我也学习总结一下,希望大家批评指正.首先我们看看代理模式.我们以游戏中的例子进行分析.
代理模式:对一些对象提供代理，以限制哪些对象去访问其它对象。
[java]
package com.jindegege.service;
public interface buy_car {
public String buy_car();
}
package com.jindegege.service;
public interface buy_car {
public String buy_car();
}
新建一个People类，具有买车的行为，所以实现接口buy_car：
[java]
package com.jindegege.buy_car;
import com.jindegege.service.buy_car;
public class People implements buy_car {
private int cash;
private String username;
public int getCash() {
return cash;
}
public void setCash(int cash) {
this.cash = cash;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
@Override
public String buy_car() {
// TODO Auto-generated method stub
return username + "买了一台新车";
}
}
package com.jindegege.buy_car;
import com.jindegege.service.buy_car;
public class People implements buy_car {
private int cash;
private String username;
public int getCash() {
return cash;
}
public void setCash(int cash) {
this.cash = cash;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
@Override
public String buy_car() {
// TODO Auto-generated method stub
return username + "买了一台新车";
}
}
people类不能拥有车，必须经过proxy代理类的认证，符合条件之后才可以拥有车辆，新建一个代理，这个代理类来考察当前的people是否有资格进行买车：
[java]
package com.jindegege.buy_car;
import com.jindegege.service.buy_car;
public class buy_car_impl implements buy_car {
private People people;
public People getPeople() {
return people;
}
public void setPeople(People people) {
this.people = people;
}
public String buy_car() {
if (people.getCash() > 2000) {
return people.getUsername() + "花" + people.getCash()+ "块买了新车,交易结束!";
} else {
return people.getUsername() + "金钱不够，请继续比赛!";
}
}
package com.jindegege.buy_car;
import com.jindegege.service.buy_car;
public class buy_car_impl implements buy_car {
private People people;
public People getPeople() {
return people;
}
public void setPeople(People people) {
this.people = people;
}
public String buy_car() {
if (people.getCash() > 2000) {
return people.getUsername() + "花" + people.getCash()+ "块买了新车,交易结束!";
} else {
return people.getUsername() + "金钱不够，请继续比赛!";
}
}
下面我们创建一个andriod客户端(控制层),用来控制前面的业务层,先给出一个简单的xml
[java]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textview01"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<TextView
android:id="@+id/textview02"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textview01"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
&n
补充：移动开发 , Android ,
