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 inte易做图ce buy_car {
   public String buy_car();
}
package com.jindegege.service;

public inte易做图ce 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 ,