IPC機制 用Messenger進行進程間通訊

Messenger類能夠在不一樣進程中傳遞Messge對象進行數據通訊

Messenger是輕量級的IPC方案對AIDL進行了封裝。

步驟：

一、在Service的onBind()方法中建立Messenger對象，並關聯Handler

 private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case MSG_FROMCLIENT:
                    Log.i(TAG,"收到客戶端信息-------"+msg.getData().get("msg"));
                    //獲得客戶端傳來的Messenger對象
                    Messenger mMessenger=msg.replyTo;
                    Message mMessage=Message.obtain(null,MessengerService.MSG_FROMCLIENT);
                    Bundle mBundle=new Bundle();
                    mBundle.putString("rep","這裏是服務端，咱們收到信息了");
                    mMessage.setData(mBundle);
                    try {
                        mMessenger.send(mMessage);
                    } catch (RemoteException e) {
                        e.printStackTrace();
                    }
                    break;
            }
        }
    };
@Override
    public IBinder onBind(Intent intent) {

        return new Messenger(mHandler).getBinder();
    }
}
//在清單文件中 註冊爲 遠程Service  android:process=":remote

2.在Activity中

private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what){
                case MessengerService.MSG_FROMCLIENT:
                    Log.i(MessengerService.TAG, "收到服務端信息-------" + msg.getData().get("rep"));
                    break;
            }
        }
    };

private ServiceConnection mServiceConnection=new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
　　　　　　//經過 IBinder 對象 建立 Messenger對象
        mMessenger=new Messenger(service);
        Message mMessage=Message.obtain(null,MessengerService.MSG_FROMCLIENT);
        Bundle mBundle=new Bundle();
        mBundle.putString("msg", "這裏是客戶端，收到了嘛服務端");
        mMessage.setData(mBundle);
        //將Messenger傳遞給服務端
        mMessage.replyTo=new Messenger(mHandler);
        try {
            mMessenger.send(mMessage);
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }