Android---Messenger-IPC通信

Messenger的使用

服务端：

public class MessengerService extends Service {
    public static final String TAG = "Messenger";
    public static final int MSG_FROM = 1000;
    //control+o自动重载
    //option+enter自动导包
    private Handler mHander  = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what){
                case MSG_FROM :
                    Log.i(TAG, "from client" + msg.getData().get("msg"));
                    //以下代码使服务端在收到信息时可以给客户端回复信息
                    Messenger mMessenger = msg.replyTo;
                    Message mMessage = Message.obtain(null, MessengerService.MSG_FROM);
                    Bundle bundle = new Bundle();
                    bundle.putString("rep", "reply");
                    mMessage.setData(bundle);
                    try{
                        mMessenger.send(mMessage);
                    }catch (RemoteException e){
                        e.printStackTrace();
                    }
                    break;
            }
        }
    };
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return new Messenger(mHander).getBinder();
    }
}

<application android:allowBackup="true" android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true" android:theme="@style/AppTheme">
        <activity android:name=".MainActivity" android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service android:name=".MessengerService"
                android:label="@string/app_name"
            android:process=":romote"
            />
    </application>

client

Intent intent = new Intent(MainActivity.this, MessengerService.class);
        bindService(intent, mService, Context.BIND_AUTO_CREATE);

@Override
    protected void onDestroy() {
        super.onDestroy();
        unbindService(mService);
    }

//接收服务端回复的信息
    private Handler mHandler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what){
                case MessengerService.MSG_FROM:
                    Log.i(MessengerService.TAG, "reply :" + msg.getData().get("rep"));
                    break;
            }
        }
    };

private ServiceConnection mService = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            //connect servicer
            mMessenger = new Messenger(service);
            Message mes =  Message.obtain(null, MessengerService.MSG_FROM);
            Bundle bun = new Bundle();
            bun.putString("msg", "hello world");
            mes.setData(bun);
            //make server reply
            mes.replyTo = new Messenger(mHandler);
            try{
                mMessenger.send(mes);
            }catch (RemoteException e){
                e.printStackTrace();
            }
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {

        }
    };