Runnable上的NetworkOnMainThreadException(NetworkOnMainThreadException on Runnable)

 你在每个loop中echo结果。 这就是为什么你的js无法正确解析它的原因。 您应该echo一次（在循环结束时）。 
 
$return_array = array();

foreach ($abc as $key => $value) {
    $temp = array();
    $temp['admin_name'] = $value['uName'];
    $temp['admin_email'] = $value['uEmail'];
    $temp['admin_ip'] = $value['ipAddress'];

    $return_array[] = $temp;
}

 echo json_encode($return_array);

You are echoing the result every loop. That is the reason why your js cant parse it correctly. You should echo it once(on the end of the loop.).
 
$return_array = array();

foreach ($abc as $key => $value) {
    $temp = array();
    $temp['admin_name'] = $value['uName'];
    $temp['admin_email'] = $value['uEmail'];
    $temp['admin_ip'] = $value['ipAddress'];

    $return_array[] = $temp;
}

 echo json_encode($return_array);