android AIDL

Android Interface Definition Language : Android接口定义语言

• 新建一个AIDL文件，在这个文件中定义好Activity需要与Service进行通信的方法

定义接口

MyAIDLService.aidl

无访问修饰符

package com.example.servicetest;  
interface MyAIDLService {  
    int plus(int a, int b);  
    String toUpperCase(String str);  
} 

支持的数据类型

• 基本数据类型
• String和CharSequence
• List:只支持ArrayList,里面的元素都必须被AIDL支持
• Map:只支持HashMap,里面的元素必须被AIDL 支持
• 实现Parcelable接口的对象
• 所有AIDL接口

实现

return new MyAIDLService.Stub(){};

public class MyService extends Service {  
  
    ......  
  
    @Override  
    public IBinder onBind(Intent intent) {  
        return mBinder;  
    }  
  
    private Binder mBinder = new MyAIDLService.Stub() {  
  
        @Override  
        public String toUpperCase(String str) throws RemoteException {  
            if (str != null) {  
                return str.toUpperCase();  
            }  
            return null;  
        }  
  
        @Override  
        public int plus(int a, int b) throws RemoteException {  
            return a + b;  
        }  
    };  
  
}

跨进程调用

myAIDLService = MyAIDLService.Stub.asInterface(service);

public class MainActivity extends Activity{ 
      
    private MyAIDLService myAIDLService;  
  
    private ServiceConnection connection = new ServiceConnection() {  
  
        @Override  
        public void onServiceDisconnected(ComponentName name) {  
        }  
  
        @Override  
        public void onServiceConnected(ComponentName name, IBinder service) {  
            myAIDLService = MyAIDLService.Stub.asInterface(service);  
            try {  
                int result = myAIDLService.plus(3, 5);  
                String upperStr = myAIDLService.toUpperCase("hello world");  
            } catch (RemoteException e) {  
                e.printStackTrace();  
            }  
        }  
    };  
  
    ......  
  
}

Parcelable接口