android - Activity 监听器 - 谷歌云消息传递 - BroadcastReceiver

Question

我已经在我的 android 应用程序中实现了 GCM，它可以正常接收消息。BroadcastReceiver 是根据 Google 提供的示例在 list 文件中设置的。

我的问题如下:如果用户正在打开应用程序，而我想更新该 View 中的一些结果 - 如何做到这一点？我首先考虑将此 Activity 注册为 BroadCastReceiver 收到的任何内容的监听器。但是，这必须是一个静态的监听器列表，因为将设置 BroadcastReceiver 的新实例 - 但也许这不是执行此操作的方法。

这是我目前拥有的

        public class GCMBroadcastReceiver extends WakefulBroadcastReceiver  {

            @Override
            public void onReceive(Context context, Intent intent) {
                ComponentName comp = new ComponentName(context.getPackageName(),
                        GCMIntentService.class.getName());
                startWakefulService(context, (intent.setComponent(comp)));
                setResultCode(Activity.RESULT_OK);
            }
        }


        public class GCMIntentService extends IntentService {
            public static final int NOTIFICATION_ID = 1;
            private NotificationManager mNotificationManager;
            NotificationCompat.Builder builder;

            public GCMIntentService() {
                super("GCMIntentService");
            }

            @Override
            protected void onHandleIntent(Intent intent) {
                Bundle extras = intent.getExtras();
                GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this);
                String messageType = gcm.getMessageType(intent);

                if (!extras.isEmpty()) {
                   if (GoogleCloudMessaging.
                            MESSAGE_TYPE_MESSAGE.equals(messageType)) {

                     /** How to check if the activity 
GameActivity is running, and hence send an 
update signal to it? If it's not running a 
notification should be created.
    **/
                   }
                }
                GCMBroadcastReceiver.completeWakefulIntent(intent);
            }
        }

这是 list 文件中的重要部分:

       <receiver
            android:name="q.w.e.gcm.GCMBroadcastReceiver"
            android:permission="com.google.android.c2dm.permission.SEND" >
            <intent-filter>
                <action android:name="com.google.android.c2dm.intent.RECEIVE" />

                <category android:name="q.w" />
            </intent-filter>
        </receiver>

        <service android:name="q.w.e.gcm.GCMIntentService" />

有什么建议吗？

谢谢!

Answer 1

有两种处理方法。

<强>1。检查 Activity 是否正在运行。

ActivityManager am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
List<RunningTaskInfo> taskInfo = am.getRunningTasks(1);
ComponentName componentInfo = taskInfo.get(0).topActivity;
if(componentInfo.getPackageName().equalsIgnoreCase("com.yourpackagename")){
    //Activity Running
    Send a broadcast with the intent-filter which you register in your activity
    where you want to have the updates
} 
else{
    //Activity Not Running
    //Generate Notification
}

<强>2。使用 SendOrderedBroadcast。

这blog将使您了解如何实现这一目标。