Question

I am getting a null pointer exception when attempting to set a CheckBox to checked.

Example of my code:

CheckBox something;
something.setChecked(true);

What am i doing wrong here?

Answer 1

It is because you did not instantiate your CheckBox object properly.

If your CheckBox is in an xml file you can do :

something = (CheckBox)findViewById(R.id.idofYourCheckbox);

If not just do :

something = new CheckBox(Context ct);

See this for more info.