[移动开发]设计模式：（kotlin）----代理模式---动态代理

代码示例：

package com.lyc.myeight.interfaces

interface ZuFang {
        fun KanFang()
        fun DingJia(int: Int)
        fun QianHeTong()
}

package com.lyc.myeight

import android.util.Log
import com.lyc.myeight.interfaces.ZuFang

class Fangdong:ZuFang {
    companion object{
        val TAG="testlyc"
    }
    override fun KanFang() {
        Log.d(TAG,"kan")
    }

    override fun DingJia(int: Int) {
        Log.d(TAG,"一个月租金: $int")
    }

    override fun QianHeTong() {
        Log.d(TAG,"签合同")
    }
}

handler类：

package com.lyc.myeight

import android.util.Log
import java.lang.reflect.InvocationHandler
import java.lang.reflect.Method

class ZhongJieHandler :InvocationHandler{
    private var mTarget:Any?=null
    constructor(target: Any){
        this.mTarget=target
    }
    override fun invoke(p0: Any?, p1: Method?, p2: Array<out Any>?): Any? {
        Log.d("testlyc", "执行前")
        var result:Any?=null
        if (p1 != null) {
            result = p1.invoke(mTarget, *p2.orEmpty())
        }
       Log.d("testlyc", "执行后")
        return result
    }
}

Smart类：

package com.lyc.myeight

import com.lyc.myeight.interfaces.ZuFang
import java.lang.reflect.Proxy

class ZhongJieSmart {
    var mzuFang:ZuFang?=null
    constructor(zuFang: ZuFang){
        this.mzuFang=zuFang
        mzuFang=Proxy.newProxyInstance(
            zuFang.javaClass.classLoader,
            arrayOf(ZuFang::class.java),
            ZhongJieHandler(mzuFang!!)
        ) as ZuFang
    }
}

运行结果：

2022-06-30 14:51:32.299 15381-15381/com.lyc.myeight D/testlyc: 执行前
2022-06-30 14:51:32.299 15381-15381/com.lyc.myeight D/testlyc: kan
2022-06-30 14:51:32.299 15381-15381/com.lyc.myeight D/testlyc: 执行后
2022-06-30 14:51:32.299 15381-15381/com.lyc.myeight D/testlyc: 执行前
2022-06-30 14:51:32.299 15381-15381/com.lyc.myeight D/testlyc: 一个月租金: 300
2022-06-30 14:51:32.299 15381-15381/com.lyc.myeight D/testlyc: 执行后
2022-06-30 14:51:32.300 15381-15381/com.lyc.myeight D/testlyc: 执行前
2022-06-30 14:51:32.300 15381-15381/com.lyc.myeight D/testlyc: 签合同
2022-06-30 14:51:32.300 15381-15381/com.lyc.myeight D/testlyc: 执行后