get到一种进程间通讯新方法---Messenger

实现两个数相加的功能

服务端：

public class MessageService extends Service {
    private static final int MSG_SUM = 0x110;
    public MessageService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        return messenger.getBinder();
    }

    private Messenger messenger = new Messenger(new Handler(){
        @Override
        public void handleMessage(Message msg) {
            Message message = Message.obtain(msg);
            switch (msg.what){
                case MSG_SUM:
                    message.what = MSG_SUM;
                    try {
                        Thread.sleep(2000);
                        message.arg2 = msg.arg1 + msg.arg2;
                        msg.replyTo.send(message); //给客户端传递消息

                    }catch (Exception e){
                        e.printStackTrace();
                    }
                    break;
            }
            super.handleMessage(msg);
        }
    });
}

<service
    android:name=".MessageService"
    android:enabled="true"
    android:exported="true">
    <intent-filter>
        <action android:name="com.example.administrator.ipcdemo.messenger"/>
        <category android:name="android.intent.category.DEFAULT"/>
    </intent-filter>
</service>

客户端：

private Messenger mService;

private Messenger messenger = new Messenger(new Handler(){
    @Override
    public void handleMessage(Message msg) {
        switch (msg.what){
            case MSG_SUM:
                Toast.makeText(MainActivity.this,msg.arg2+"",Toast.LENGTH_LONG).show();
                break;
        }
        super.handleMessage(msg);
    }
});
private ServiceConnection conn = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        Log.i("wanlijun","onServiceConnected");
        mService = new Messenger(service);

    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        Log.i("wanlijun","onServiceDisconnected");
        mService = null;
    }
};

绑定服务：

Intent intent = new Intent();
intent.setAction("com.example.administrator.ipcdemo.messenger");
intent.setPackage("com.example.administrator.ipcdemo");
bindService(intent,conn,BIND_AUTO_CREATE);

相加：

try {
    Message msg = Message.obtain(null,MSG_SUM,1,1);
    msg.replyTo = messenger; 
    mService.send(msg); //给服务端发消息
}catch (RemoteException e){
    e.printStackTrace();
}

其本质还是通过编写AIDL文件和利用Binder通讯，只是进行了封装