Android_关于 Application 实现多继承

使用接口代理的方式

• 定义一个代理的 ProxyApplication 继承 Application

    public class ProxyApplication extends Application {    
         private IApplicationListener listener;    
         @Override    
         public void onCreate() {        
         super.onCreate();        
         if(listener != null){            
             listener.onProxyCreate();        
         }    
    }    
    @Override    
    public void attachBaseContext(Context base){            
        super.attachBaseContext(base);       
        this.listener = initProxyApplication();        
        if(this.listener != null){               
        this.listener.onProxyAttachBaseContext(base);        
        }   
    }    
    @Override    
    public void onConfigurationChanged(Configuration newConfig) {   
        super.onConfigurationChanged(newConfig);        
        if(this.listener != null){              
             this.listener.onProxyConfigurationChanged(newConfig);   
    }    
    }    
    private IApplicationListener initProxyApplication() {        
    try {            
        Class clazz = Class.forName("speed.huben.testmultiextendsapplication.ImplementApplication");           
        return (IApplicationListener)clazz.newInstance();       
    } catch (ClassNotFoundException e) {            
        e.printStackTrace();        
    } catch (InstantiationException e) {            
        e.printStackTrace();       
    } catch (IllegalAccessException e) {            
        e.printStackTrace();        }        
    return null;    }}
  

• 自定义HApplication 继承 ProxyApplication

  <application    
       android:name=".HApplication"
       ...
  

• 定义一个IApplicationListener

  public interface IApplicationListener {    
       public void onProxyCreate();    
       public void onProxyAttachBaseContext(Context base);    
       public void onProxyConfigurationChanged(Configuration newConfig);
  }
  

• 具体实现对应的 Application 实现 IApplicationListener

    public class BDProxyApplication extends BaiduApplication implements IApplicationListener{
  
    @Override
    public void onProxyCreate() {
    super.onCreate();
    }
  
    @Override
    public void onProxyAttachBaseContext(Context base) {
    super.attachBaseContext(base);
    }
  
   @Override
   public void onProxyConfigurationChanged(Configuration config) {
   super.onConfigurationChanged(config);
   }
   }
  

使用内部类

• 代理实现的ProxyApplication

   public class ProxyApplication extends Application {    
   @Override    
   public void onCreate() {        
   super.onCreate();        
   new ImplBaiduApplication().onCreate();        
   new ImplTencentApplication().onCreate();   
   }    
   @Override    
   public void attachBaseContext(Context base){              
   super.attachBaseContext(base);    }    
   @Override    
   public void onConfigurationChanged(Configuration newConfig) {        
   super.onConfigurationChanged(newConfig);    }    
  
   public class ImplBaiduApplication extends BaiduApplication { 
   @Override        
   public void onCreate() {            
   super.onCreate();        }    }    
   public class ImplTencentApplication extends TencentApplication {        
   @Override       
   public void onCreate() {            
   super.onCreate();        }    }}
  

demo实现

https://github.com/huben/TestMultiExtendsApplication