Question

I use my cursor to get a certain value out of my database table. It gets it out of a column with the type ‘TEXT’. The idea is that the standard value of the column is blank, but when a certain button is clicked, a query will add “true” to it.

String var = c.getString(1); //use cursor to get value

But when I want to use this to compare to a string, f.e.

if(var.equals("true")) {
//do something crazy
}

I get an error on items where there is nothing filled in the DB. Only the fields where actually “true” is filled in won’t give an error. I tried c.getString(1).toString(); but this doesn’t do the trick… any ideas?

Answer 1

check should be like below

if("true".equals(var)) {

So that you will not get NullPointerException

As suggested in Cursor#getString Javadoc

The result and whether this method throws an exception when the column value is null or the column type is not a string type is implementation-defined.

You should use Cursor#isNull or Cursor#moveToFirst before checking value from database.

 if(!c.isNull(1))
 //Get Value here

Or 

if(c.moveToFirst())
 //get value here