本文介绍了按字母顺序对Enum.values()进行排序,然后将它们添加到Spinner ArrayAdapter的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在开发可与Web服务一起使用的Android应用程序。
I'm developing an Android application that works with a Web service.
我想按字母顺序排序 Enum.values()
的描述。
I want to sort alphabetically Enum.values()
by its description.
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<$ c $的最佳选择c>枚举,但是我在Java开发方面是一个新手。
Maybe, this is not the best choice to use an Enum
, but I'm very new on Java development.
您知道如何使用其字母顺序对其进行排序 statureString
?
Do you know how can I sort it alphabetically using its statureString
?
我想这样做是因为我想使用这些 ArrayAdapter 上的> Enum.values():
I want to do this because I want to use these Enum.values()
on an ArrayAdapter
:
mSpinStature.setAdapter(new ArrayAdapter<Stature>(mActivity, android.R.layout.simple_dropdown_item_1line, Stature.values()));
我想选择 Stature
此处的项目:
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)
{
}
};
推荐答案
如何向枚举添加方法
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]);
}
}
这篇关于按字母顺序对Enum.values()进行排序,然后将它们添加到Spinner ArrayAdapter的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!