做一些总结，今天大致看了下GCM的使用方法，现在来稍微总结一下，作为一个温习。

GcmListenerService

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GCM Receiver

要想使用GCM，首先要 import com.google.android.gms.gcm.GcmListenerService

之后从GcmListenerService继承一个新的类

public class MyGcmListenerService extends GcmListenerService {
...
}

类中重载onMessageReceived 函数原型

public void onMessageReceived(String from, Bundle data) {
} 重载成如下

@Override
public void onMessageReceived(String from, Bundle data) {
    String message = data.getString("message");
    Log.d(TAG, "From: " + from);
    Log.d(TAG, "Message: " + message);

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Gcm Sender

从服务端发送消息到GCM服务器 使用http协议的方法如下

Content-Type:application/json
Authorization:key=AIzaSyZ-1u...0GBYzPu7Udno5aA
{
  "to";/topics/foo-bar
  "data": {
  "message":"This is GCM Topic Message",
  }
 }