java.lang.NullPointerException: Attempt to invoke virtual method on a null object reference to select sqlite

Question

I am a newbie of android world. I have a problem of the coding. It was just a tiny error buy i dont know it doesnt work even i change others method but the error still the s

Answer 1

Initialize the DatabaseHelper:

protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.surveyinstruction);

    DatabaseHelper db = new DatabaseHelper(this);

    //...
}