String from database gives nullPointerException using isEmpty

Question

I have method that returns string from my DB. My problem is when im trying to use isEmpty() or charAt(0) i get nullPointerException. here is the log cat:

05-09 15:56:47.002: E/AndroidRuntime(6914): FATAL EXCEPTION: main
05-09 15:56:47.002: E/AndroidRuntime(6914): java.lang.RuntimeException: Unable to instantiate application android.app.Application: java.lang.NullPointerException
05-09 15:56:47.002: E/AndroidRuntime(6914):     at android.app.LoadedApk.makeApplication(LoadedApk.java:504)
05-09 15:56:47.002: E/AndroidRuntime(6914):     at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4364)
05-09 15:56:47.002: E/AndroidRuntime(6914):     at android.app.ActivityThread.access$1300(ActivityThread.java:141)
05-09 15:56:47.002: E/AndroidRuntime(6914):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1294)

   public boolean setTheCorrectParameterFields(){

            String mine = "";

            String spinnerExercise = workOutChoose.getSelectedItem().toString();
            DataBaseMain fieldsNum = new DataBaseMain(getApplicationContext());
            fieldsNum.open();
            mine = fieldsNum.getParameters(spinnerExercise);
            fieldsNum.close();

            if(mine.isEmpty())
                return false;
            return true;
            }

IF that's the line its crashing at, then getParameters is returning null. Can't help more because we don't have the code for that class. — Gabe Sechan
– Gabe Sechan, Commented May 9, 2013 at 16:09

Graham Borland · Accepted Answer · 2013-05-09 16:09:10Z

1

mine is null on return from fieldsNum.getParameters(spinnerExercise). You need to check for a non-null value before trying to do other things with it.

answered May 9, 2013 at 16:09

Graham Borland

60.8k21 gold badges144 silver badges184 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

manub · Accepted Answer · 2013-05-09 16:14:17Z

0

There's a method which allows you to do a null-safe empty check on a String in Commons Lang 3.

http://commons.apache.org/proper/commons-lang//apidocs/org/apache/commons/lang3/StringUtils.html#isEmpty(java.lang.CharSequence)

answered May 9, 2013 at 16:14

manub

4,1102 gold badges27 silver badges35 bronze badges

1 Comment

ozbek Over a year ago

Oh why Commons? There is an equivalent in Android SDK, developer.android.com/reference/android/text/…

cmbaxter · Accepted Answer · 2013-05-09 16:14:41Z

0

Because isEmpty is a method on a null object, you can not call it. You should try this instead:

  boolean empty = mine == null || mine.isEmpty() ? true : false;

edited May 9, 2013 at 16:14

answered May 9, 2013 at 16:09

cmbaxter

35.5k4 gold badges88 silver badges95 bronze badges

Collectives™ on Stack Overflow

String from database gives nullPointerException using isEmpty

3 Answers 3

Comments

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related