首页 > 代码库 > 如何获取android手机联系人并按字母展示(二)
如何获取android手机联系人并按字母展示(二)
下面写怎么让每个首字母相同的联系人归类展示:
在adapter implement SectionIndexer
这样adapter里必须实现以下3个接口:
@Override public Object[] getSections() { //section的集合 } @Override public int getPositionForSection(int section) {//当前section的位置 } @Override public int getSectionForPosition(int position) {//当前position的section信息 }
所以我们必须把取到的本地联系人的数据进行加工
定义一个来存储section的信息:
private class SectionTitle{ public String title; public SectionTitle(){ title = ""; } public String toString(){ return title; } }
定义以下结构来获取实现sectionIndexer所要的信息:
private class ContactSectionMapper implements SectionIndexer { private SectionTitle[] mSections = null; private SparseIntArray mSectionPositionMap = null; private SparseIntArray mPositionSectionMap = null; public ContactSectionMapper(SectionTitle[] sectionDatas) { mSections = sectionDatas; } public void changeData(SparseIntArray sectionPositionMap, SparseIntArray positionSectionMap) { mSectionPositionMap = sectionPositionMap; mPositionSectionMap = positionSectionMap; } @Override public Object[] getSections() { return mSections; } /** * 找出这个section对应的position */ @Override public int getPositionForSection(int section) { if (mSectionPositionMap == null) return -1; if (section == 0) return -1; return mSectionPositionMap.get(section, -1); } /** * 找出这个position对应的section */ @Override public int getSectionForPosition(int position) { if (mPositionSectionMap == null) return -1; if (position <= 0) return 0; return mPositionSectionMap.get(position, -1); } /** * @param position * @return */ public boolean isSection(int position) { if (position == 0) return true; int sectionIdx = getSectionForPosition(position); int sectionPosition = getPositionForSection(sectionIdx); if (sectionIdx == -1 && sectionPosition == -1) return false; return (position == sectionPosition); } public String getSection(int position) { if (mSections == null) return NONE_ENGLISH_LETTER_TITLE; int sectionIndex = getSectionForPosition(position); if (sectionIndex < 0 || sectionIndex >= mSections.length) return NONE_ENGLISH_LETTER_TITLE; return mSections[sectionIndex].toString(); } }
在adapter里面我们重载changeCursor(每次cursor改变都会调用)这个方法,进行加工,取出数据的首字母信息
<span style="white-space:pre"> </span>@Override public void changeCursor(Cursor c) { processCursor(c); super.changeCursor(c); } private void processCursor(Cursor c) { /** define some variables */ SparseIntArray sectionPositionMap = new SparseIntArray(); SparseIntArray positionSectionMap = new SparseIntArray(); for(int i = 0; i < mSectionDatas.length; i++){ mSectionDatas[i].title = ""; } if (c == null || c.getCount() == 0 || c.isClosed()){ mSectionMapper.changeData(sectionPositionMap, positionSectionMap); return; } String curtitle = ""; int i = 0; int position = 0; while (c.moveToNext()) { position = c.getPosition(); String curLetter = getTitle(getDisplayName(c)); //看看当前的名字的第一个名字是什么,是不是section的开头 if (TextUtils.isEmpty(curtitle) || !TextUtils.equals(curLetter, curtitle)) { mSectionDatas[i].title = curLetter; //这个当前的名字是section的开头 sectionPositionMap.put(i, position); curtitle = curLetter; i++; } positionSectionMap.put(position, i - 1); } for(; i < mSectionDatas.length; i++){ mSectionDatas[i].title = curtitle; sectionPositionMap.put(i, position); } mSectionMapper.changeData(sectionPositionMap, positionSectionMap); }
在adapter的初始化里面:
protected final class ContactsAdapter extends ResourceCursorAdapter implements SectionIndexer,OnScrollListener { protected boolean mLoading = true; private ContactSectionMapper mSectionMapper = null; private SectionTitle[] mSectionDatas = null; private static final int SECTION_COUNT = 27; public ContactsAdapter(Context context) { super(context, R.layout.contacts_list_item_photo,null); mSectionDatas = new SectionTitle[SECTION_COUNT]; for (int i = 0; i < SECTION_COUNT; i++) { mSectionDatas[i] = new SectionTitle(); } mSectionMapper = new ContactSectionMapper(mSectionDatas); }
<span style="white-space:pre"> </span>@Override public Object[] getSections() { return mSectionMapper.getSections(); } @Override public int getPositionForSection(int section) { return mSectionMapper.getPositionForSection(section); } @Override public int getSectionForPosition(int position) { return mSectionMapper.getSectionForPosition(position); }
效果图:
声明:以上内容来自用户投稿及互联网公开渠道收集整理发布,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任,若内容有误或涉及侵权可进行投诉: 投诉/举报 工作人员会在5个工作日内联系你,一经查实,本站将立刻删除涉嫌侵权内容。