问Call facebook autorize对话框-未显示

EN

//return true if is autologged
//return false if facebook login dialog is called
public boolean LoginAsync(Activity act)
{
    m_strLastError="";
    boolean bTryLogin= true;
    if ((m_fbkey != null) && (m_fbkey.length() > 0))
    {
        facebook.setAccessToken(m_fbkey);
        bTryLogin = !facebook.isSessionValid();
    }
    if (bTryLogin)
    {
        facebook.authorize(act, new String[] { "email", "offline_access", "publish_stream", "read_stream"}, new LoginDialogListener());
        return false;
    }

    //"succesfull 'autologin'
    return true;
}