Question

I am trying to make a database connection with my app. It has an allow and deny button for a visitor. Whenever I try to call an operation of the database class my app force closes. For example, When I click on the Allow button I want the app to store the visitor id, date and string response in the database.
Following is the code in the mainActivity that I have for the button:

//databaseVisitor VisDB = new databaseVisitor (this);
//VisitorDatabase VDB = new VisitorDatabase();
//Defining the actions of the Allow Button

Button.OnClickListener allowListener = new Button.OnClickListener(){
    public void onClick(View arg0) {
        // TODO Auto-generated method stub

        Toast allowToast = Toast.makeText(MainActivity.this, R.string.toastYes, Toast.LENGTH_LONG);
        allowToast.show();

        //Log.d("Insert Log: ", "Inserting add log..");
        //count = VisDB.getVisitorCount();
        response = "Access Granted";
        //dt = date.getDate();

        //VisDB.addVisitor(new VisitorDatabase(count+1, dt, response));

    }   
};

Answer 1

its most probably because you are closing the cursor

cursor.close()

and then making operations on it

return cursor.getCount()

try smthg like this

int count = cursor.getCount();
cursor.close();
return count;

EDIT :

and as for VisDB do it like that

...
databaseVisitor VisDB;
...
public void onCreate(Bundle savedInstanceState) {
      ...
      VisDB = new databaseVisitor (this);
      ...
}