Android Java exception even after string null or empty check -

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I really do not understand why java.lang.NumberFormatException: illegal long: "zero" is here.

The problem snippet is like follow-up. 

  try {userid = (JSONObject) msg.obj) .getString ("userid"); If (userid.equals ("") || userid.isEmpty () || null == user id) {onClickLogout (); Return; } And {client.setUserid (Long.Personal (User ID)); }} Grip (JasonXExpress E) {// Todo Auto-Generated Catch Block e.printStackTrace (); OnClickLogout (); Return; }   
 Line Client.SetUsured (Long. Parsleyng (user-facing)); The following exception is received  
  java.lang.NumberFormatException: invalid length: "tap" at java.lang.Long.invalidLong (long.java:1225) java.lang.Long.parse At (long .java: 362) at java.lang.Long.parseLong (long.java353) at java.lang.Long.parseLong (long.Java 319) at client.setUserid (long-term user ());   
 The issue is that there is a blank exception even after the user's idle and empty check in the code. what happened with me? Please check it out experts!   
 
 
 string  value  and no reference  empty  .  
 If you use "code" in  "null" .equals (userid)  in the literal  null  value  if  Do not check different forms.

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