Kotlin メモ : ArrayAdapter

Java

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1. class MyAdapter extends ArrayAdapter<MyData> {  
2.   
3.     private final LayoutInflater inflater;  
4.   
5.     MyAdapter(Context context, List<MyData> objects) {  
6.         super(context, 0, objects);  
7.         inflater = LayoutInflater.from(context);  
8.     }  
9.   
10.     ...  
11.   
12.     @NonNull  
13.     @Override  
14.     public View getView(int position, View convertView, @NonNull ViewGroup parent) {  
15.         final MyViewHolder holder;  
16.         if (convertView == null) {  
17.             holder = MyViewHolder.create(inflater, parent);  
18.             convertView = holder.view;  
19.             convertView.setTag(holder);  
20.         } else {  
21.             holder = (MyViewHolder) convertView.getTag();  
22.         }  
23.   
24.         final MyData data = getItem(position);  
25.         assert data != null;  
26.   
27.         holder.bind(data);  
28.   
29.         return convertView;  
30.     }  
31. }  

class MyAdapter extends ArrayAdapter<MyData> { private final LayoutInflater inflater; MyAdapter(Context context, List<MyData> objects) { super(context, 0, objects); inflater = LayoutInflater.from(context); } ... @NonNull @Override public View getView(int position, View convertView, @NonNull ViewGroup parent) { final MyViewHolder holder; if (convertView == null) { holder = MyViewHolder.create(inflater, parent); convertView = holder.view; convertView.setTag(holder); } else { holder = (MyViewHolder) convertView.getTag(); } final MyData data = getItem(position); assert data != null; holder.bind(data); return convertView; } } Kotlin

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1. class MyAdapter(context: Context, objects: List<MyData>) : ArrayAdapter<MyData>(context, 0, objects) {  
2.   
3.     private val inflater = LayoutInflater.from(context)  
4.   
5.     ...  
6.   
7.     override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {  
8.         val view: View = convertView ?: MyViewHolder.create(inflater, parent)  
9.                 .also { it.view.tag = it }  
10.                 .view  
11.         getItem(position)?.let {  
12.             (view.tag as MyViewHolder).bind(it)  
13.         }  
14.         return view  
15.     }  
16. }  

class MyAdapter(context: Context, objects: List<MyData>) : ArrayAdapter<MyData>(context, 0, objects) { private val inflater = LayoutInflater.from(context) ... override fun getView(position: Int, convertView: View?, parent: ViewGroup): View { val view: View = convertView ?: MyViewHolder.create(inflater, parent) .also { it.view.tag = it } .view getItem(position)?.let { (view.tag as MyViewHolder).bind(it) } return view } }