Checking the zero line in android

Question

I am developing an Android application. I get String as null from webservice. I retrieve the value and store it in a String variable. Then, when I print the value using Log, for example Log.i ("tag", "` `!!! cell →" + cell) ;, I get a zero printed on the screen. Now I need that I need to check the variable for "null", and I want to display the text field without a value if it is "null". I use the following statement to check

if(!cell.equals(null) || !cell.equals("")) { _______ } else { _______ } 

But the control is not part of the else part if the value is us 'null'

Please give me a solution.

Thanks in advance.

Answer 1

when cell is null and you try to call a method on it, you will be thrown into a null pointer exception.

I would say

 if(cell !=null && !cell.isEmpty()) { _______yes, disply } else { _______nope, some thing wrong } 

Answer 2

its not equals(null) its

 if(cell != null || !cell.isEmpty()) 

Answer 3

Try TextUtils.html#isEmpty(java.lang.CharSequence)

Answer 4

I would try this, it seems to work for me!

 if(TextUtils.isEmpty(yourString) && yourString == null){ } else if(!TextUtils.isEmpty(yourString) && yourString != null){ } 

Answer 5

If the string value is null !cell.equals("") will evaluate to true and, therefore, it will be in the if part, and not in the else, because you are using the OR condition.

NULL! = "" (Empty string) !!!

Answer 6

Use this:

 if (cell != null && cell.trim().length() > 0) { // do whatever you want } else { // the string received is null } 

Answer 7

Android provides a simple utility

 TextUtils.isEmpty(<<stringVariable>>); 

Read more @ http://developer.android.com/reference/android/text/TextUtils.html

Answer 8

JOB!!!

  if (string.matches("")&& string.trim().equals("null")){ return false; } else{ return true; }