Android design mode-Agent Mode, android design mode --

Android design mode-Agent Mode, android design mode --

1. Definition:

Provides a proxy for other objects to control access to this object.
2. Use:
In some cases, an object is not suitable or cannot directly reference another object, and the proxy object can play a mediation role between the client and the target object.
3. functions:
Proxy objects can play a mediation role between the client and the target object, which plays a role and protects the target object.
4. Division:
Proxy is also divided into remote proxy, virtual proxy, protection proxy and smart pointer;

Below is a simple demo;

The Bank is a simple object, but you do not want to modify it,

Then, the BankProxy is used to access the Bank object to hold the use of the Bank and protect it;

First, the bank interface;

Package com. example. demo. proxy;/*** bank interface * @ author qubian * @ data June 3, 2015 * @ email naibbian@163.com **/public interface BankInterface {public String setBankName (String name ); public void addCount ();}

Next is the object that has been written and needs to be protected;

Package com. example. demo. proxy; /*** Bank Implementation ** @ author qubian * @ data June 3, 2015 * @ email naibbian@163.com **/public class Bank implements BankInterface {/*** needs to be related to the name of the Bank operation */@ Overridepublic String setBankName (String name) {return name + "Bank_001" ;}@ Overridepublic void addCount () {// specific operation }}

Proxy class, specific operations:

Package com. example. demo. proxy;/*** Proxy class, I do not want to access directly, Bank class, that is, you do not want to modify the Bank class * so that I can use the proxy * @ author qubian * @ data June 3, 2015 * @ email naibbian@163.com */public class BankProxy implements BankInterface {private Bank mBank; public void setmBank (Bank mBank) {this. mBank = mBank ;}@ Overridepublic String setBankName (String name) {if (mBank = null) {mBank = new Bank ();} // The proxy class is actually used inside the proxy. // you can add the proxy or your own operation String setName = mBank. setBankName (name); // other operations return setName;} @ Overridepublic void addCount () {if (mBank = null) {mBank = new Bank ();} mBank. addCount (); // other operations }}

Usage:

Package com. example. demo. proxy; public class UserProxy {public void useBank () {BankInterface bank = new BankProxy (); bank. setBankName ("China Merchants bank"); bank. addCount ();}}

In Android, proxies are used in many places:

1. AIDL is used for inter-process communication in Android. In the system, AIDL is used to define a remote service, which is a remote proxy mode. Link

2. In the source code, the ActivityManagerProxy class is a proxy, which is the agent of ActivityManagerNative. The IActivityManager interfaces are used in the ActivityManager class;