how to check the SharedPreferences string is empty or null

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I print the fotonew key and it sends a null value. But if urlfoto is empty or not, if (urlfoto! = Null &&! Urlfoto.equals (" ")) goes to this section. Normally he should go to else. The urlfoto value goes to the part with a full urlfoto value in the case of null but if else. I want to check if the key I pulled is empty or full.

SharedPreferences sharedPrefNew = getContext().getSharedPreferences("sharedPref",Context.MODE_PRIVATE);

urlfoto = sharedPrefNew.getString("fotonew", "");

if(urlfoto!= null && !urlfoto.equals(""))
{
    ...
}
else {
    System.out.println("boş");
    ...
}

You already declared default value of SharedPreference on Code.

urlfoto = sharedPrefNew.getString("fotonew", "");

This means if "fotonew" is empty or null sharedPrefNew returns a value ""

How to check whether shared preferences is null or not in android , SharedPreferences.Editor.putString � SharedPreferences.Editor.commit � Context. getSharedPreferences getString("text", null); if (restoredText != null) { String name = prefs.getString("name", "No @Test public void set() { rxPreferences. We've also created a function isNullOrEmpty() which checks, as the name suggests, whether the string is null or empty. It checks it using a null check using != null and isEmpty() method of string. In plain terms, if a string isn't a null and isEmpty() returns false, it's not either null or empty. Else, it is.


this line:

sharedPrefNew.getString("fotonew", "")

is responsible for taking value from shared pref. First parameter is a key, second one is a default value that will be returned if key is not found. In your case, if there is no object stored for key "fotoNew" an empty string will be returned.

You can return null :

sharedPrefNew.getString("fotonew", null);

Hope that helps.

android.content.SharedPreferences.getString java code examples , You may want to check out the right sidebar which shows the related API usage. private void checkUpgrade(SharedPreferences prefs) { String lastVersion� To check if a string is null or empty in Java, use the == operator. Let’s say we have the following strings. String myStr1 = "Jack Sparrow"; String myStr2 = "";


Check below code

   if (sharedPrefNew.getString("fotonew", "") != null && !sharedPrefNew.getString("fotonew", "").isEmpty()){
       //your code here
    }

Best Practice - SharedPreferences, In this tutorial we'll use Shared Preferences in our android application to store data in getString(Email, "")); } } public void Save(View view) { String n = name. Hi String.Isnullorempty method will check only for null value or empty while zero is different from null for zero it should be like StringVariable.ToString.Equals(“0”)


android.content.SharedPreferences#getString, If you need to check specifically for an empty string over null, I would think checking against "" is your best bet, using the === operator (so that you know that it is, in fact, a string you're comparing against).


Android Shared Preferences Example Tutorial, StringUtils.isEmpty(String str) - Checks if a String is empty ("") or null. or. StringUtils.isBlank(String str) - Checks if a String is whitespace, empty ("") or null. the latter considers a String which consists of spaces or special characters eg " " empty too. See java.lang.Character.isWhitespace API


Returns Boolean. true if the value parameter is null or an empty string (""); otherwise, false.. Examples. The following example examines three strings and determines whether each string has a value, is an empty string, or is null.