在Android中,如何将AlphabetIndexer与数字一起使用?下面的代码似乎不起作用
AlphabetIndexer alphabetIndexer =
new AlphabetIndexer(cursor, COLUMN_INDEX,"0123456789")
答案 0 :(得分:2)
AlphabetIndexer似乎与数字一样正常。 我创建了一个简单的ListFragment,它结合了字符串和数字列表,对它们进行排序并在列表中显示功能快速滚动。 这也适用于只有数字的列表。
public class ListFragment extends android.support.v4.app.ListFragment {
public static final String VALUE_COLUMN = "value_column";
public static final String[] PROJECTION = new String[] {
BaseColumns._ID,
VALUE_COLUMN
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setListAdapter(new AlphanumericAdapter(getActivity(),
generateDataCursor(getSortedListOfEntries())));
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
getListView().setFastScrollAlwaysVisible(true);
getListView().setFastScrollEnabled(true);
}
private Cursor generateDataCursor(ArrayList<String> entriesAsArrayList) {
MatrixCursor entriesAsCursor = new MatrixCursor(PROJECTION);
for (String entry : entriesAsArrayList) {
entriesAsCursor.addRow(new String[] { "0", entry });
}
return entriesAsCursor;
}
private ArrayList<String> getSortedListOfEntries() {
ArrayList<String> listEntries = new ArrayList<String>();
for (Locale locale : Locale.getAvailableLocales()) {
int randomIntegerBetweenZeroAndNine = (int) (Math.random() * 10);
listEntries.add(String.valueOf(randomIntegerBetweenZeroAndNine));
String countryName = locale.getDisplayCountry();
if (TextUtils.isEmpty(countryName)) listEntries.add(countryName);
}
Collections.sort(listEntries);
return listEntries;
}
private class AlphanumericAdapter extends SimpleCursorAdapter implements SectionIndexer {
private final AlphabetIndexer mAlphabetIndexer;
public AlphanumericAdapter(Context context, Cursor cursor) {
super(context, android.R.layout.simple_list_item_1, cursor, new String[] { VALUE_COLUMN }, new int[] { android.R.id.text1 });
mAlphabetIndexer = new AlphabetIndexer(cursor, 1, "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ");
}
@Override
public Object[] getSections() {
return mAlphabetIndexer.getSections();
}
@Override
public int getPositionForSection(int sectionIndex) {
return mAlphabetIndexer.getPositionForSection(sectionIndex);
}
@Override
public int getSectionForPosition(int position) {
return mAlphabetIndexer.getSectionForPosition(position);
}
}
}
答案 1 :(得分:0)
你在谈论什么样的数字范围?只有0-9?否则,我不确定那会做你想要的,因为按字母顺序00000000可能会继续1111111和22222222或2222.你应该自己实现节索引器界面,这是一个非常简单的界面:http://developer.android.com/reference/android/widget/SectionIndexer.html你可以返回部分范围如“0-99”。但是如果你真的只想要数字0-9,那么你可以使用一个简单的CursorWrapper来使用AlphabetIndexer,它返回Cursor中数字的字符串值。 http://developer.android.com/reference/android/database/CursorWrapper.html
注意:这假设您的光标返回数字/非字符串类型。