Question

I’m using the below code to find a resource by id;

setContentView(R.layout.golders);
    for (int i=1; i<hm.size()+1;i++)
        {
            int id = getStringIdentifier("Bus"+i);
            view = (TextView)findViewById(id);
            view.setText(hm.get(i).toString());
        }

My getStringIdentifier() is working but when I try to set the text I’m getting a NullPointerException.

I’ve used the setContentView to focus on the golders.xml file which has the ids that I want to update.

I’ve tried Cleaning the project but that hasn’t done anything either, any ideas?! Thanks!

EDIT:

public int getStringIdentifier(String aString)
    {
        String packageName = "com.example.bustimetable.Robbos";
        int resId = getResources().getIdentifier(aString, "string", packageName);
        return resId;
      }

Answer 1

Your getStringIdentifier(String) method returns a string ID (something from R.string). You need a new method, something like getIdentifier(String), that will return soemthing from R.id. I can’t see the XML, so I don’t know what your TextView‘s ID is, but… you’ll want to verify that the ID is, in fact, Bus_ where the _ is some number.

public int getIdentifier(String aString)
{
    String packageName = "com.example.bustimetable.Robbos";
    int resId = getResources().getIdentifier(aString, "id", packageName); // Get from R.id, not R.string
    return resId;
}