NullPointerException at android.content.ContextWrapper

Question

When I try to get a color via getResources().getColor(R.color.yellow) in a normal Activity I get this exception:

07-12 11:58:38.019: E/AndroidRu         


        

Answer 1

int backgroundColor = Color.YELLOW;

instead of

int backgroundColor = getResources().getColor(R.color.yellow);

Answer 2

Your mDragListener is a member variable. At the point of initializing the Activity object/instance might not be ready. So calling getResource() of the Activity will fail.

// inner class or normal class ... change scope if needed
private class DragListener {
    int color = 0;
    public DragListener(Context context) {
        color = context.getResource().getColor(R.color.yellow);
    }
}

// activity
private DragListener mDragListener;
public void onCreate(...) {
    mDragListener = new DragListener(this);
    // more code
}