u.Login

Logging in users

In order to start the login process you call the startLogin method.

This process will dispatch one of two events:

• LineSDKEvent.LOGIN_COMPLETE: when the login process is complete and the user has successfully logged in;
• LineSDKEvent.LOGIN_ERROR: when there was an error during the login process

Example:

LineSDK.instance.addEventListener( LineSDKEvent.LOGIN_COMPLETE, loginCompleteHandler );
LineSDK.instance.addEventListener( LineSDKEvent.LOGIN_ERROR, loginErrorHandler );
LineSDK.instance.startLogin();

function loginCompleteHandler( event:LineSDKEvent ):void
{
    trace( "loginCompleteHandler" );
}

function loginErrorHandler( event:LineSDKEvent ):void
{
    trace( "loginErrorHandler: " + event.text );
}

After successful login you can access the user's profile and access token.

Note: If you call startLogin when a user is already logged in then the LOGIN_COMPLETE event will dispatch immediately and no screens will be shown to your user. You should call logout before calling startLogin to present the login screen again.

Logout

If at any point you wish to logout your user from LINE you use the logout method.

This process will dispatch one of two events:

• LineSDKEvent.LOGOUT_COMPLETE: when the logout process is complete and the user is no longer logged in;
• LineSDKEvent.LOGOUT_ERROR: when there was an error during the logout process (eg the user was not logged in)

Example:

LineSDK.instance.addEventListener( LineSDKEvent.LOGOUT_COMPLETE, logout_completeHandler );
LineSDK.instance.addEventListener( LineSDKEvent.LOGOUT_ERROR, logout_errorHandler );
LineSDK.instance.logout();


function logout_completeHandler( event:LineSDKEvent ):void
{
    trace( "logout_completeHandler" );
}

private function logout_errorHandler( event:LineSDKEvent ):void
{
    trace( "logout_errorHandler: " + event.text );
}

Checking Existing

After initialisation you can check whether there is an existing user already logged in.

To check if the user is signed in use the isAuthorized function:

if (LineSDK.instance.isAuthorized())
{
    // User is logged in
}

You can use this to see if you have a returning user to your application that has previously signed in to your application using their credentials. This way you can bypass your login screen and present the correct information for your user.