Question

I have an adapter which extends ArrayAdapter<T> and want to inject into them LayoutInflater. Code presented below, but inflater is always null

public abstract class MyAdapter<T> extends ArrayAdapter<T> {

    @Inject
    protected LayoutInflater inflater;

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // inflater here is null
    }
}

Answer 1

Probably you’ve created MyAdapter instance with new instead of injecting it.

In this case I would not recommend to inject LayoutInflater, unless you want to use different implementations of this class, example mock of LayoutInflater for testing.

Obtain the instance in constructor:

inflater = LayoutInflater.from(context);

It would be more efficient. I can’t see any benefit from injecting LayoutInflater.
Dependency injection is ok, but don’t use it when it’s not necessary and slow.