UniversalAdapter

This small library aims to prevent Android developpers from writing the same boring code for Adapters again and again.
Indeed, for Adapters, Google suggest to use the ViewHolder pattern which leads to a very ugly code and a non reusable View.

This library proposes to change the goal of the Adapter. It's no longer an object which builds a View and set the data of the item in the View (calling setText(), setImage(), etc...). But it's an object which chooses a View corresponding to an item and the View itself is responsible for binding the data of the item.

So you have an Adapter which usually do the same thing, so it can be written once (in the library) and used for many items and views. And you have some reusable Views which can be used for a ListVIew and in other parts of your application.

How to use it ?

The steps to create a ListView using this library are :

1. Create a View and let it implement UAdaptable<I, V> where I is the class of the item to show and V the class of the view itself.
   
2. Implement the two methods of UAdaptable :
   a. newInstance() which returns another View. In most of the cases you just have to call the constructor of the View.
   b. bind(I item) which is where you set the data of the item in the View.
   
3. Instantiate a UArrayAdapter<I, V> in your Activity/Fragment passing to it the Context, a List of items, and an instance of the View.

Example :

1. The View which shows an instance of MyItem

    public class MyItemView extends LinearLayout implements UAdaptable<MyItem, MyItemView>
    {
        private TextView  text;
        private ImageView image;
    
        public MyItemView(Context context) {
            super(context);
            init();
        }
    
        private void init() {
            View.inflate(getContext(), R.layout.myitemview, this);
            text = (TextView) findViewById(R.id.myitemview_text);
            image = (ImageView) findViewById(R.id.myitemview_image);
        }
    
        @Override
        public void bind(int position, MyItem item, Adapter adapter) {
            text.setText(item.getText());
            image.setImageResource(item.getImageResource());
        }
    
        @Override
        public MyItemView newInstance() {
            return new MyItemView(getContext());
        }
    }

2. The Activity/Fragment (ctx represents the Context)

    UArrayAdapter<MyItem, MyItemView> adapter = new UArrayAdapter<MyItem, MyItemView>(ctx, items, new MyItemView(ctx));
    listView.setAdapter(adapter);