跨进程通信IPC------Messager

不使用 AIDL的情况下，进行跨进程通信IPC跨进程通信，通过messager 传递

以下代码是client向RemoteService发送消息,并返回给client

参考地址：http://mp.weixin.qq.com/s?__biz=MzA5MzI3NjE2MA==&mid=2650236008&idx=1&sn=c7a1f1de9ee92e6d7a2d00f04821a8c3&scene=0#wechat_redirect
          http://www.cnblogs.com/freeliver54/archive/2012/06/13/2547739.html
          
1. Activity ==============

public class MainActivity extends AppCompatActivity {

    Messenger mMessenger;
    
    private ServiceConnection mServiceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
            mMessenger = new Messenger(iBinder);
            mBind = true;
        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {
            mBind = false;
            mMessenger = null;
        }
    };
    
     public void onStart(){
        super.onStart();
        Intent intent = new Intent();
        intent.setPackage("com.sohu.tv.testaction");
        intent.setClass(this,RemoteService.class);
        bindService(intent,mServiceConnection,Context.BIND_AUTO_CREATE);
    }
    
     private Messenger mRemoteServiceBack2ClientMessager = new Messenger(new Handler() {
        @Override
        public void handleMessage(Message msg) {
            if (msg.what == RemoteService.CLIENT_NOTIFI_SERVICE_WHAT) {
                Toast.makeText(MainActivity.this,"remote service back arg1 " + msg.arg1 + " arg2=" + msg.arg2,Toast.LENGTH_SHORT).show();
            } else {
                super.handleMessage(msg);
            }
        }
    });
   
    
 private void onButtonClick() {
        if (mBind) {
            Message msg = Message.obtain(null, RemoteService.CLIENT_NOTIFI_SERVICE_WHAT, 20, 30);
            
            // 为msg设置自己封装的user对象
            User user = new User();
            user.setAge(13);
            user.setUsername("111");
            Bundle bundle = new Bundle();
            bundle.setClassLoader(User.class.getClassLoader());
            bundle.putParcelable("user_key", user);
            msg.setData(bundle);
            
            // client自己创建新messager, 并设置到msg上。  RemoteService调用 msg.replyTo.send()来向客户端发送result
            msg.replyTo = mRemoteServiceBack2ClientMessager;
            
            try {
                mMessenger.send(msg);
            } catch (Exception e) {
                Toast.makeText(MainActivity.this, "exception...", Toast.LENGTH_SHORT).show();
            }
        }
    }

 protected void onStop() {
        super.onStop();
        if (mBind){
            unbindService(mServiceConnection);
            mBind = false;
        }
    }
    
}

2. RemoteService =========

public class RemoteService extends Service {

    public static final int CLIENT_NOTIFI_SERVICE_WHAT = 100;

    final Messenger messager = new Messenger(new IncomingHandler());

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        Toast.makeText(RemoteService.this, "binding...", Toast.LENGTH_SHORT).show();
        return messager.getBinder();
    }


    class IncomingHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            if (msg.what == CLIENT_NOTIFI_SERVICE_WHAT) {
            
                Bundle bundle = msg.getData();
                bundle.setClassLoader(User.class.getClassLoader());
                User user = (User) bundle.getParcelable("user_key");

                Toast.makeText(RemoteService.this, " service receiver message success" + " obj = " + user.toString() + " arg1 = " + msg.arg1 + "  arg2=" + msg.arg2, Toast.LENGTH_SHORT).show();
           
            try {
                     msg.replyTo.send(Message.obtain(null, CLIENT_NOTIFI_SERVICE_WHAT, 12, 13));
                 }catch(Exception e){
                     Toast.makeText(RemoteService.this, "remoteService response send msg exception...", Toast.LENGTH_SHORT).show();
                 }
            }
            
            super.handleMessage(msg);
        }
    }
   
 3.Manifest.xml ==============
 
      <service
            android:name=".RemoteService"
            android:process=":remotemyservice"/>