java - GCM : How to send heartbeat to GCM server

Question

我想从我的应用程序向 GCM 服务器发送一个心跳信号，以便连接保持有效。

我该怎么做，我怎么知道我的 GCM 服务器的 URL？

提前致谢!

Answer 1

如何发送心跳

这个类可以发送正确的 Intent

   public class GcmKeepAlive  {

        protected CountDownTimer timer;
        protected Context mContext;
        protected Intent gTalkHeartBeatIntent;
        protected Intent mcsHeartBeatIntent;

        public GcmKeepAlive(Context context) {
            mContext = context;
            gTalkHeartBeatIntent = new Intent(
                    "com.google.android.intent.action.GTALK_HEARTBEAT");
            mcsHeartBeatIntent = new Intent(
                    "com.google.android.intent.action.MCS_HEARTBEAT");  
        }

        public void broadcastIntents() {
            System.out.println("sending heart beat to keep gcm alive");
            mContext.sendBroadcast(gTalkHeartBeatIntent);
            mContext.sendBroadcast(mcsHeartBeatIntent);
        }

    }

如果你只是想发送心跳你可以在一个Activity中执行以下操作

GcmKeepAlive gcmKeepAlive = new GcmKeepAlive(this);
gcmKeepAlive.broadcastIntents();

我认为您不需要为此设置任何额外的权限，但这是我在 list 中拥有的 gcm 相关权限

<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<permission
    android:name=your_package_name.permission.C2D_MESSAGE"
    android:protectionLevel="signature" />

<uses-permission android:name="your_package_name.permission.C2D_MESSAGE" />

一种定期发送心跳的方法

如果您想定期发送它们，我是这样做的:

    public class GcmKeepAliveBroadcastReceiver extends BroadcastReceiver {

        private GcmKeepAlive gcmKeepAlive;

        @Override
        public void onReceive(Context context, Intent intent) {
            System.out.println("inside gcm keep alive receiver");
            gcmKeepAlive = new GcmKeepAlive(context);
            gcmKeepAlive.broadcastIntents();

        }

    }

我还有一个服务，它有一个 Dagger 注入(inject)的 alarmmanger 和 pendingintent

@Inject AlarmManager alarmManager;
@Inject PendingIntent gcmKeepAlivePendingIntent;


alarmManager.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, 1000, 4*60*1000, gcmKeepAlivePendingIntent);

这是 Dagger 模块的部分，它提供警报管理器和未决 Intent 。有几种方法可以让警报管理器定期调用一个方法，所以假设你不使用 Dagger，你应该仍然可以拉出相关部分。您的问题是如何发送心跳，而不是如何使用警报管理器。已经有很多答案了，所以搜索一下。

@Provides PendingIntent provideGcmKeepAlivePendingIntent() {
    System.out.println("pending intent provider");
    Intent gcmKeepAliveIntent = new Intent("com.gmail.npnster.first_project.gcmKeepAlive");
    return PendingIntent.getBroadcast(mContext, 0, gcmKeepAliveIntent, PendingIntent.FLAG_CANCEL_CURRENT);
}

@Provides  AlarmManager provideGcmKeepAliveAlarmManager() {
    return (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);
}