如何检查app.oncreate（）是通过推送通知调用的还是在用户打开app的过程中调用的

Question

我有一个App extends application类，它有一个onCreate()函数，在Android应用程序开始时执行

我如何在app.oncreate（）中检查函数是在push通知接收期间调用的（通过下面的IntentService）还是通过其他方式调用的（即通过用户按下应用图标实际打开应用）？

public class GCMNotificationIntentService extends IntentService {

    public static final int NOTIFICATION_ID = 1;
    public static final String EXTRA_MESSAGE = "message";
    private NotificationManager mNotificationManager;
    NotificationCompat.Builder builder;

    public GCMNotificationIntentService() {
        super("GcmIntentService");
    }

    public static final String TAG = "GCMNotificationIntentService";

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

        // The getMessageType() intent parameter must be the intent you received
        // in your BroadcastReceiver.
        String messageType = gcm.getMessageType(intent);

        if (!extras.isEmpty()) {        // has effect of unparcelling Bundle

            /*
             * Filter messages based on message type. Since it is likely that GCM
             * will be extended in the future with new message types, just ignore
             * any message types you're not interested in, or that you don't
             * recognize.
             */

            if (GoogleCloudMessaging.MESSAGE_TYPE_SEND_ERROR.equals(messageType)) {
//                sendNotification("Send error: " + extras.toString());
            } else if (GoogleCloudMessaging.MESSAGE_TYPE_DELETED.equals(messageType)) {
//                sendNotification("Deleted messages on server: " + extras.toString());
            }
            // If it's a regular GCM message, process it
            else if (GoogleCloudMessaging.MESSAGE_TYPE_MESSAGE.equals(messageType)) {

                // if this is a normal message from Earthmiles backend
                if (extras.containsKey(EXTRA_MESSAGE)){
                    sendNotification("" + extras.get(EXTRA_MESSAGE));
                    Log.i(TAG, "Received Server Push Notif: " + extras.toString());
                } else if(extras.containsKey("mp_message")) {
                    String mp_message = intent.getExtras().getString("mp_message");
                    sendNotification(mp_message);
                    Log.i(TAG, "Received Mixpanel Push Notif: " + mp_message);
                }
            }

        }
        GcmBroadcastReceiver.completeWakefulIntent(intent);
    }

    private void sendNotification(String msg) {
        Log.d(TAG, "Preparing to send notification...: " + msg);
        mNotificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);

        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(this, MainActivity.class), 0);

        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
                this).setSmallIcon(R.drawable.earthmiles_logo_green)
                .setContentTitle("Earthmiles")
                .setSmallIcon(R.drawable.earthmiles_logo_green)
                .setStyle(new NotificationCompat.BigTextStyle().bigText(msg))
                .setContentText(msg);

        mBuilder.setContentIntent(contentIntent);
        mBuilder.getNotification().flags |= Notification.FLAG_AUTO_CANCEL;
        mBuilder.setAutoCancel(true);
        mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
        Log.d(TAG, "Notification sent successfully.");
        App.getAnalytics().track(Emanalytics.RECIEVED_PUSH_NOTIF, new Properties()
                        .putValue("Message Text", msg)
        );

    }
}

Answer 1

即使这是可能的，你也不应该这么做。

当最后一个活动结束时，Android可能会也可能不会让VM留在身边。如果它没有杀死VM，那么下一次启动应用程序时（不管用什么方法），Android将（或至少可能）重用相同的application实例，而不需要再调用oncreate()。因此，如果您正在根据调用oncreate()时确定的某些条件更改应用程序的行为，那么下次启动它时它可能会做错误的事情。