接收 gcm 推送通知的刷新活动 [英] Refreshing activity on receiving gcm push notification

问题描述

更新: GCM 已弃用，请使用 FCM

如果我的应用打开，如何刷新接收 gcm 推送通知的活动.我有一个活动，其中包含填充了来自服务器的数据的列表视图.如果我收到 gcm 推送通知(其中还包含一些数据)，我想刷新我的活动(在这里再向列表视图添加一项).

How to refresh activity on receiving gcm push notification if my app is open. I have an activity which contains listview filled with data from the server. I want to refresh my activity (here adding one more item to listview) , if I receive gcm push notification(which also contains some data).

• 一种替代方法是添加计时器，它会定期执行服务器请求并更新列表适配器数据，但我不想要这些，因为这会占用大量资源.
• 我是否需要添加广播接收器，它会在接收到 gcm 推送时触发，进一步请求更新的服务器数据并更新我的活动 UI?

亲爱的评论者，请仔细阅读问题，我只需要刷新列表(如果应用程序已打开且特定活动已打开)其他不需要.

Dear commentors, please read the question carefully, I only need to refresh the list (if app is open and that particular activity is open) else no need for same.

推荐答案

我花了几个小时才弄明白.在这里发帖以防其他人遇到同样的问题.

Took me a few hours to figure it out. Posting here in case anyone anyone else has the same problem.

这个想法是您必须将您的活动注册为广播接收器.最简单的方法是这样的:

The idea is that you have to register your activity as a broadcast receiver. The easiest way to do this is like so:

//register your activity onResume()
@Override
public void onResume() {
    super.onResume();
    context.registerReceiver(mMessageReceiver, new IntentFilter("unique_name"));
}

//Must unregister onPause()
@Override
protected void onPause() {
    super.onPause();
    context.unregisterReceiver(mMessageReceiver);
}


//This is the handler that will manager to process the broadcast intent
private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {

        // Extract data included in the Intent
        String message = intent.getStringExtra("message");

        //do other stuff here
    }
};

上面的代码进入你想要监听"事件的活动.

The above code goes in the activity that you want to 'listen' for events.

现在，我们如何向这个侦听器"发送数据?转到您的推送通知处理程序(或从您想要更新您的活动的位置)，当您收到通知时调用此函数:

Now, how do we send data to this 'listener'? Go to your push notification handler(or from where you want to update your activity) and when you receive a notification call this function:

// This function will create an intent. This intent must take as parameter the "unique_name" that you registered your activity with
static void updateMyActivity(Context context, String message) {

    Intent intent = new Intent("unique_name");

    //put whatever data you want to send, if any
    intent.putExtra("message", message);

    //send broadcast
    context.sendBroadcast(intent);
}

当您调用上述函数时，您的活动应该会收到它.

When you call the above function, your activity should receive it.

注意:您的 Activity 必须正在运行/打开才能接收广播 Intent

Note: Your activity must be running/open to receive the broadcast intent

注意2:我切换到了一个名为otto"的图书馆.它实际上做同样的事情，但更容易，在整个应用程序中广播事件".这是一个链接 http://square.github.io/otto/

Note2: I switched to a library called 'otto'. It does actually the same thing but easier, 'broadcasts events' thoughout the app. Here's a link http://square.github.io/otto/

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