Roboguice injection into adapter

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
    }
}

score 5 · Accepted Answer · answered Sep 19 '12 at 12:00

5

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.

answered Sep 19 '12 at 12:00

pawelzieba

16,082
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Yes i create my adapter instance with `new` because i should to pass arguments into constructor. How i can inject it into activity? How i can choose requared constructor and pass params to it? – Dmitriy Tarasov Sep 20 '12 at 09:25
For passing args into constructor: http://stackoverflow.com/questions/9237996/pass-parameter-to-constructor-with-guice Or `injectMembers`: http://stackoverflow.com/questions/5116383/guice-injectmembers-method Both solutions are ugly in your case :) – pawelzieba Sep 20 '12 at 09:42

score 5 · Answer 2 · answered Aug 30 '13 at 23:30

5

Inject dependencies in any class

 RoboGuice.getInjector(context).injectMembers(this);

use in constructor, just need context, great works for me

answered Aug 30 '13 at 23:30

Serhii Bohutskyi

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Roboguice injection into adapter

2 Answers2