안 드 로 이 드 에서 Activity 의 방법 으로 사상 을 바 꿉 니 다.

package com.xujing.test
//    
public interface Activity{
    //        
    public void onCreate();
    //        
    public void onStart();
    //        
    public void onDestory();
}

package com.xujing.test
//       Activity  
public void MyActivity implements Activity{
    //      ，        
    @Override
    public void onCreate(){
        System.out.println("onCreate....");
    }

    //      ，        
    @Override
    public void onStart(){
        System.out.println("onStart....");
    }

    //      ，        
    @Override
    public void onDestory(){
        System.out.println("onDestory....");
    }
}

package com.xujing.test
//       
public class AndroidSystem{
    //      
    public static final int CREATE=1;
    //      
    public static final int START=2;
    //      
    public static final int DESTORY=3;

    //    
    public void run(Activity a,int state){
        switch(state){
            //  
            case CREATE:
                a.onCreate();
                break;
            //  
            case START:
                a.onStart();
                break;
            //  
            case DESTORY:
                a.onDestory();
                break;
        }
    }
}

package com.xujing.test
//   
public class Test{
    //   
    public static void main(String[] args){
        //   AndroidSystem
        AndroidSystem system = new AndroidSystem();

        //   MyActivity
        Activity a = new MyActivity();

        //  
        system.run(a,AndroidSystem.CREATE);
        //  
        system.run(a,AndroidSystem.START);
        //  
        system.run(a,AndroidSystem.DESTORY);
    }
}