Is expo token generated on real device?-CodePudding

What im trying to do is to implement the push notification expo on my mobile app. To do that I am using the expo push token, which identifies the device to send the notification. When I tested it locally the expo token is generated but when I tried on APK, the expo token is not generated. Does the expo token work only locally and not in production, or have I missed a configuration or code?

the function that generates it:

  function startNotifications() {
    return Notifications.getExpoPushTokenAsync()
      .then(pushTokenData => {
        if (Platform.OS === 'android') {
          Notifications.setNotificationChannelAsync(ANDROID_NOTIF_CHANNEL, ANDROID_NOTIF_CONFIG);
        }
        setExpoPushToken(pushTokenData.data);
        return 'granted';
      });
  }

This function is called when the user allows notification, but in any scenarios(even if I don't ask the user and I just created it) in the APK, it won't be generated it.

How can I fix this?

CodePudding user response：

Expo is pretty well documented when it comes to push notifications. You first need to request permissions, if you don't do that you will never get a push notification token.

Here is a snippet from their official documentation, I've added comments for each of the steps:

// Don't request a token if this is a simulator
if (Device.isDevice) {

// Check to see if there is an existing permissions status
const { status: existingStatus } = await Notifications.getPermissionsAsync();

let finalStatus = existingStatus;

// If the user hasn't granted permissions, ask them if they are ok with this request
if (existingStatus !== 'granted') {
  const { status } = await Notifications.requestPermissionsAsync();
  finalStatus = status;
}

// The user has chosen not to give us permission - p.s. you shouldn't show this message to the user, it is just for testing (it can be ignored)
if (finalStatus !== 'granted') {
  alert('Failed to get push token for push notification!');
  return;
}

// The user has granted permissions, you can grab the token
token = (await Notifications.getExpoPushTokenAsync()).data;
console.log(token);

} else {
  // This isn't really important, but can help for your initial testing
  alert('Must use physical device for Push Notifications');
}

You just need to ensure that you are requesting permissions from the user before attempting to get the token - otherwise it will never be returned (unless for some weird reason the user already gave permission without being asked - which should practically be impossible).

Here is a link to the official docs: https://docs.expo.dev/versions/latest/sdk/notifications/#api, you can skip ahead to the registerForPushNotificationsAsync method.