按字母顺序对Enum.values()进行排序,并将它们添加到Spinner ArrayAdapter中

Question

我正在开发一个与Web服务一起使用的Android应用程序.

我想Enum.values()通过其描述按字母顺序排序.

我有这个Enum:

public enum Stature
{
    tall (0, MSDApplication.getAppContext().getString(R.string.stature_tall)),
    average(1, MSDApplication.getAppContext().getString(R.string.stature_average)),
    small(2, MSDApplication.getAppContext().getString(R.string.stature_small));

    private final int stature;
    private final String statureString;

    Stature(int anStature, String anStatureString) { stature = anStature; statureString = anStatureString; }

    public int getValue() { return stature; }

    @Override
    public String toString() { return statureString; }
}

也许,这不是使用a的最佳选择Enum,但我是Java开发的新手.

你知道怎么用它按字母顺序排序statureString吗？

我想这样做,因为我想用这些Enum.values()上ArrayAdapter:

mSpinStature.setAdapter(new ArrayAdapter<Stature>(mActivity, android.R.layout.simple_dropdown_item_1line, Stature.values()));

我想在Stature这里获取所选项目:

private OnItemSelectedListener listener = new OnItemSelectedListener()
{

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int pos,
            long aid)
    {
        if (parent.equals(mSpinStature))
        {
            Stature item = (Stature)parent.getAdapter().getItem(pos);
            Log.v("TAG", item.toString() + item.getValue());
        }
    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0)
    {
    }

};

Answer 1

如何在枚举中添加方法

enum Stature {
    tall, average, small;

    public static Stature[] getSortedVaules() {
        Stature[] statures = values();
        Arrays.sort(statures, EnumByNameComparator.INSTANCE);
        return statures;
    }

    private static class EnumByNameComparator implements Comparator<Enum<?>> {

        public static final Comparator<Enum<?>> INSTANCE = new EnumByNameComparator();

        public int compare(Enum<?> enum1, Enum<?> enum2) {
            return enum1.name().compareTo(enum2.name());
        }

    }

}

public class StatureTest {

    @Test
    public void getSortedValues() {
        Stature[] normalValues = Stature.values();
        Assert.assertEquals(Stature.tall, normalValues[0]);
        Assert.assertEquals(Stature.average, normalValues[1]);
        Assert.assertEquals(Stature.small, normalValues[2]);

        Stature[] sortedVaules = Stature.getSortedVaules();
        Assert.assertEquals(Stature.average, sortedVaules[0]);
        Assert.assertEquals(Stature.small, sortedVaules[1]);
        Assert.assertEquals(Stature.tall, sortedVaules[2]);
    }
}