Android通过继承Binder类实现多进程通信

private static final java.lang.String DESCRIPTOR = "org.ninetripods.mq.multiprocess_sever.IAidlCallBack";private static final int KEY_FLAG = 0x110;private class MyBinder extends Binder {    /**     * @param code 唯一标识，客户端传递标识执行服务端代码     * @param data 客户端传递过来的参数     * @param reply 服务器返回回去的值     * @param flags 是否有返回值 0:有 1:没有     * @return     * @throws RemoteException 异常     */    @Override    protected boolean onTransact(int code, Parcel data, Parcel reply, int flags) throws RemoteException {      switch (code) {        case KEY_FLAG:          //标识服务器名称          data.enforceInterface(DESCRIPTOR);          Apple apple = new Apple("红星苹果", 15f, getString(R.string.response_binder_info));          reply.writeNoException();          reply.writeInt(1);          apple.writeToParcel(reply, android.os.Parcelable.PARCELABLE_WRITE_RETURN_VALUE);          return true;      }      return super.onTransact(code, data, reply, flags);    }  }  @Override  public IBinder onBind(Intent intent) {    return new MyBinder();  }

 <service  android:name=".BinderService"  android:enabled="true"  android:exported="true">  <intent-filter>    <action android:name="android.mq.binder.service" />    <category android:name="android.intent.category.DEFAULT" />  </intent-filter></service>

private ServiceConnection binderConnection = new ServiceConnection() {    @Override    public void onServiceConnected(ComponentName name, IBinder service) {      isBound = true;      mService = service;      if (mService != null) {        //声明两个Parcel类型数据(_data和_reply) 一个用于传输数据 一个用于接收数据        android.os.Parcel _data = android.os.Parcel.obtain();        android.os.Parcel _reply = android.os.Parcel.obtain();        Apple apple;        try {          //与服务器端的enforceInterface(DESCRIPTOR)对应          _data.writeInterfaceToken(DESCRIPTOR);          //调用服务端的transact()传输数据          mService.transact(KEY_FLAG, _data, _reply, 0);          _reply.readException();          if (0 != _reply.readInt()) {            //接收服务端响应数据            apple = Apple.CREATOR.createFromParcel(_reply);          } else {            apple = null;          }          showMessage(apple != null ? ("/n" + apple.getNoticeInfo() + "/n名称："              + apple.getName() + "/n价格：" + apple.getPrice() + " 元") : "未获得服务器信息", R.color.red_f);        } catch (Exception e) {          e.printStackTrace();        } finally {          _data.recycle();          _reply.recycle();        }      }    }    @Override    public void onServiceDisconnected(ComponentName name) {      isBound = false;      mService = null;    }  };

 Intent intent = new Intent(); intent.setAction("android.mq.binder.service"); intent.setPackage("org.ninetripods.mq.multiprocess_sever"); bindService(intent, binderConnection, BIND_AUTO_CREATE);