messenger，client和server通信Demo

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</pre><p>Server</p><p></p><p><pre name="code" class="java">public class MessengerService extends Service {private Handler handle=new Handler(){public void handleMessage(Message msg) {//获得传过来的messenger，用来向客户端发送数据Messenger replayTo=msg.replyTo;//计算结果int res=msg.arg1+msg.arg2;//从消息池中获得一个新的message；Message newMsg=Message.obtain();//将计算的结果放到arg1中；newMsg.arg1=res;//newMsg.replyTo=replayTo;try {//发送回去给客户端replayTo.send(newMsg);} catch (RemoteException e) {// TODO Auto-generated catch blocke.printStackTrace();}};};@Overridepublic IBinder onBind(Intent intent) {//绑定成功的时候打印一句Toast.makeText(getApplicationContext(), "计算成功 ", 0).show();//实质返回Messenger//客户端发送的消息到上面处理return new Messenger(handle).getBinder();}}

Client

public class MainActivity extends Activity implements OnClickListener {
private Button bind;
private EditText num1,num2;
private TextView result;
private Messenger replyto;

/**
* 处理服务端返回的信息
*/
private Handler handle=new Handler(){
public void handleMessage(Message msg) {
result.setText(msg.arg1+"");

};
};
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

bind=(Button) findViewById(R.id.bind);
num1=(EditText) findViewById(R.id.num1);
num2=(EditText) findViewById(R.id.num2);
result=(TextView) findViewById(R.id.result);
//新建一个messenger，用于服务端返回数据的载体
replyto=new Messenger(handle);
bind.setOnClickListener(this);
}

@Override
public void onClick(View v) {

Intent intent=new Intent("ln");

bindService(intent, conn, Context.BIND_AUTO_CREATE);

}

private ServiceConnection conn=new ServiceConnection() {

@Override
public void onServiceDisconnected(ComponentName name) {
// TODO Auto-generated method stub

}

@Override
public void onServiceConnected(ComponentName name, IBinder service) {
//通过new messenger（Ibind ）取得绑定返回的messenger。
Messenger messenger=new Messenger(service);
Message msg=Message.obtain();
msg.arg1=Integer.parseInt(num1.getText().toString());
msg.arg2=Integer.parseInt(num2.getText().toString());
//设置用于发送回来的messenger
msg.replyTo=replyto;
try {
messenger.send(msg);
} catch (RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
};

protected void onDestroy() {
unbindService(conn);

};

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