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public class ObjectSerializer {
    companion object {
        public fun serialize(obj: Any?) : String {
            if (obj == null) {
                return ""
            }

            var baos = ByteArrayOutputStream()
            var oos = ObjectOutputStream(baos)
            oos.writeObject(obj)

minsoopark

public class SquareImageView extends ImageView {
    public SquareImageView(Context context) {
        this(context, null);
    }
 
    public SquareImageView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }
 
    public SquareImageView(Context context, AttributeSet attrs, int defStyle) {

minsoopark

public class CollectionUtil {
  public interface PropertyGetter <T, U> {
    public U getProperty(T from);
  }
  
  public static <T, U> List<T> getPropertiesFromList(List<U> list, PropertyGetter<U, T> getter) {
    List<T> result = new ArrayList<T>();
    for (U object : list) {
      result.add(getter.getProperty(object));
    }

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// ~~

public abstract class FilteringAdapter<T> extends BaseAdapter implements Filterable {

    public interface StringGetter<T> {
        String getString(T from);
    }

    protected Context context;
    protected List<T> origin;