1 //AIDL 文件所在的包
2 package com.houny.demo_aidl.aidl;
3 
4 //接口名必须和AIDL文件名一致
5 interface ISay{
6     boolean Say();
7     boolean SayInt(int i);
8     boolean SayString(String str);
9 }

 1 public class BackgroundService extends Service{
 2 
 3      /**
 4      * 通过这种方式实现AIDL里定义的接口
 5      */
 6      ISay.Stub say = new ISay.Stub() {
 7           
 8           //实现接口的方法
 9          // ...
10           
11      };
12      
13 
14      @Override
15      public IBinder onBind(Intent intent) {
16           //把那个接口对象返回出去
17           return say;
18      }
19 
20      //...
21 }

1  <service android:name=".service.BackgroundService"/>

 1     private void initAIDL() {
 2         //初始化ServiceConnection,并实现回调方法
 3         serviceConnection= new ServiceConnection() {
 4             
 5             @Override
 6             public void onServiceDisconnected(ComponentName name) {
 7                 say = null;
 8             }
 9             
10             @Override
11             public void onServiceConnected(ComponentName name, IBinder service) {
12                 //当Service绑定成功后会通过回调执行这个方法
13                 say = ISay.Stub.asInterface(service);
14             }
15         };
16     }

    private void startService() {
        Intent intent = new Intent(MainActivity.this, BackgroundService.class);
        this.bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE);
        this.startService(intent);
    }

try {
    say.SayString("Hello");
} catch (Exception e) {
    e.printStackTrace();
}