android 仿微信联系人首字母分组快速索引

总结是一种习惯，不能停，一停人就懒了，都快一个月没有写了！该提提神了！

进入正题：android 仿微信联系人首字母快速索引，先用下美团的索引效果图：

1、自定义View字母索引栏(右边那一列)：

public class QuickIndexBar extends View {private final String[] LETTERS = new String[]{"↑", "#", "A", "B", "C", "D", "E", "F","G", "H", "I", "J", "K", "L", "M", "N","O", "P", "Q", "R", "S", "T", "U", "V","W", "X", "Y", "Z"};//画笔private Paint mPaint;//单元格高private float cellHeight;//单元格宽private float cellWidth;private OnLetterUpdateListener mOnLetterUpdateListener;/*** 设置字母监听** @param onLetterUpdateListener*/public void setOnLetterUpdateListener(OnLetterUpdateListener onLetterUpdateListener) {mOnLetterUpdateListener = onLetterUpdateListener;}public QuickIndexBar(Context context) {this(context, null);}public QuickIndexBar(Context context, AttributeSet attrs) {this(context, attrs, 0);}public QuickIndexBar(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);//去锯齿mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mPaint.setColor(Color.DKGRAY);//粗体mPaint.setTypeface(Typeface.DEFAULT_BOLD);}@Overrideprotected void onDraw(Canvas canvas) {for (int i = 0; i < LETTERS.length; i++) {String text = LETTERS[i];//计算xy坐标//获取文本的宽度mPaint.measureText(text)int x = (int) (cellWidth / 2.0f - mPaint.measureText(text) / 2.0f);//获取文本的高度Rect rect = new Rect();//文本所在的矩形，创建空矩形mPaint.getTextBounds(text, 0, text.length(), rect);//填充文本int textHeight = rect.height();//获取文本高度int y = (int) (cellHeight / 2.0f + textHeight / 2.0f + cellHeight * i);<span style="color:#ff0000;"> //当字母被选中，使用不同颜色画出来，根据需求改变画笔的属性就可以了if (i == touchIndex){mPaint.setColor(Color.GREEN);mPaint.setFakeBoldText(true);}</span>canvas.drawText(LETTERS[i], x, y, mPaint);<span style="color:#ff0000;"> mPaint.reset();</span>}}/*** This is called during layout when the size of this view has changed. If* you were just added to the view hierarchy, you're called with the old* values of 0.** @param w    Current width of this view.* @param h    Current height of this view.* @param oldw Old width of this view.* @param oldh Old height of this view.*/@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);//测量出view的宽cellWidth = getMeasuredWidth();//测量view高度除以格子总数cellHeight = getMeasuredHeight() / LETTERS.length;}<span style="color:#ff0000;"> /**</span>

<span style="color:#ff0000;">    * 这段代码实现外部列表滑动时，监听可视首项改变，用来改变画笔颜色进行突出</span>

<span style="color:#ff0000;">    */</span>

    <span style="color:#ff0000;">//被选中项int touchIndex = -1;public int getTouchIndex() {return touchIndex;}//设置被选中项public void setTouchIndex(int touchIndex) {this.touchIndex = touchIndex;invalidate();}</span>@Overridepublic boolean onTouchEvent(MotionEvent event) {int index;switch (MotionEventCompat.getActionMasked(event)) {case MotionEvent.ACTION_DOWN://所在view中点击的Y坐标（屏幕中的绝对坐标），换算成位置index = (int) (event.getY() / cellHeight);if (index >= 0 && index < LETTERS.length) {if (index != touchIndex) {if (mOnLetterUpdateListener != null) {mOnLetterUpdateListener.onLetterUpdateListener(LETTERS[index]);touchIndex = index;}}}break;case MotionEvent.ACTION_MOVE:index = (int) (event.getY() / cellHeight);if (index >= 0 && index < LETTERS.length) {<span style="color:#ff0000;">if (index != touchIndex) {if (mOnLetterUpdateListener != null) {mOnLetterUpdateListener.onLetterUpdateListener(LETTERS[index]);touchIndex = index;}}</span>}break;case MotionEvent.ACTION_UP:break;default:break;}//重绘，被选中字母颜色变化invalidate();//拦截事件并处理return true;}<span style="color:#cc0000;">/*** 对外暴露字母监听*/
public interface OnLetterUpdateListener {void onLetterUpdateListener(String letter);
}
}</span>

这边注释得很详细，需要注意的地方，我都进行标红了！

2、布局：

<RelativeLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"><android.support.v7.widget.RecyclerViewandroid:id="@+id/rv_persons"android:layout_width="match_parent"android:layout_height="match_parent"/><com.example.views.QuickIndexBarandroid:id="@+id/qib_bar"android:layout_width="40dp"android:layout_height="match_parent"android:layout_alignParentRight="true"android:background="@color/gray_half"/>
</RelativeLayout>

这边本人使用了 RecyclerView 替换 listview

不过并不建议这么做，因为在点击索引栏定位时：

rv_persons.getLayoutManager().scrollToPosition(i);

recycleView 索引时是从下往上滚，只要符合要求的项为可视项就不在进行滚动，所以当你点击的字母栏字母，满足

item 在 目前可视项下方，recycleView 从下往上滚就会出现在当前界面最后一项，也就是底部项！

所以还是使用listview，这边最好的选择是使用 ExpandableListView ，以方便后期的扩展，虽然数据进行多次分组会很麻烦！

3、字符串转换成拼音工具类：

这边需要用到 pinyin4j-2.5.0.jar：下载地址：jar包下载地址

import net.sourceforge.pinyin4j.PinyinHelper;
import net.sourceforge.pinyin4j.format.HanyuPinyinCaseType;
import net.sourceforge.pinyin4j.format.HanyuPinyinOutputFormat;
import net.sourceforge.pinyin4j.format.HanyuPinyinToneType;
import net.sourceforge.pinyin4j.format.exception.BadHanyuPinyinOutputFormatCombination;/*** Created by f on 2015-12-01.* 根据汉子文本获取拼音首字母*/
public class PinYinUtil {/*** 将汉语拼音转化成字母** @param str 字符串* @return 字母串*/public static String getPinyin(String str) {//输出格式HanyuPinyinOutputFormat mFormat = new HanyuPinyinOutputFormat();//输出为大写字母mFormat.setCaseType(HanyuPinyinCaseType.UPPERCASE);//去掉音标mFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);StringBuilder sb = new StringBuilder();char[] chars = str.toCharArray();for (char c : chars) {//如果是空格跳过if (Character.isWhitespace(c)) {continue;}//判断是否为汉字if (Character.toString(c).matches("[\\u4E00-\\u9FA5]+")) {String s = "";try {//通过char得到拼音集合,单->dan或者是shans = PinyinHelper.toHanyuPinyinStringArray(c, mFormat)[0];sb.append(s);} catch (BadHanyuPinyinOutputFormatCombination badHanyuPinyinOutputFormatCombination) {badHanyuPinyinOutputFormatCombination.printStackTrace();sb.append(s);}} else if (Character.toString(c).matches("^[a-zA-Z]*")) {//判断是否是英语，是保留sb.append(c);} else {    //不是汉字不是英语的，保留下来的,使用“#”代替，归为一类sb.append("#");}}return sb.toString();}}

这边根据自己分组需求，进行整改！

4、Java bean类：


import com.example.utils.PinYinUtil;


import java.io.Serializable;/*** * 联系人界面bean,实现Comparable<Persons>接口对每个类的对象进行整体排序*/
public class Persons <span style="color:#cc0000;">implements Comparable<Persons>{</span>private String name;private String pinyin;private int imageId;public Persons() {}public Persons(int imageId, String name, String status) {this.imageId = imageId;this.name = name;this.status = status;this.pinyin = PinYinUtil.getPinyin(name);}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getImageId() {return imageId;}public void setImageId(int imageId) {this.imageId = imageId;}public String getPinyin() {return pinyin;}public void setPinyin(String pinyin) {this.pinyin = pinyin;}/*** 重写父类方法，对比pinyin进行自然排序** @param another Persons* @return 该对象小于、等于或大于指定对象，则分别返回负整数、零或正整数。*/@Overridepublic int compareTo(Persons another) {return this.pinyin.compareTo(another.getPinyin());}@Overridepublic String toString() {return "Persons{" +"name='" + name + '\'' +", pinyin='" + pinyin + '\'' +", imageId=" + imageId +'}';}
}

5、例子名单：

public static final String[] NAMES = new String[]{"宋江", "卢俊义", "吴用","公孙胜", "关胜", "林冲", "秦明", "呼延灼", "花荣", "柴进", "李应", "朱仝", "鲁智深","武松", "董平", "张清", "杨志", "徐宁", "索超", "戴宗", "刘唐", "李逵", "史进", "穆弘","雷横", "李俊", "阮小二", "张横", "阮小五", " 张顺", "阮小七", "杨雄", "石秀", "解珍"," 解宝", "燕青", "朱武", "黄信", "孙立", "宣赞", "郝思文", "韩滔", "彭玘", "单廷珪","魏定国", "萧让", "裴宣", "欧鹏", "邓飞", " 燕顺", "杨林", "凌振", "蒋敬", "吕方","郭 盛", "安道全", "皇甫端", "王英", "扈三娘", "鲍旭", "樊瑞", "孔明", "孔亮", "项充","李衮", "金大坚", "马麟", "童威", "童猛", "孟康", "侯健", "陈达", "杨春", "郑天寿","陶宗旺", "宋清", "乐和", "龚旺", "丁得孙", "穆春", "曹正", "宋万", "杜迁", "薛永", "施恩","周通", "李忠", "杜兴", "汤隆", "邹渊", "邹润", "朱富", "朱贵", "蔡福", "蔡庆", "李立","李云", "焦挺", "石勇", "孙新", "顾大嫂", "张青", "孙二娘", " 王定六", "郁保四", "白胜","时迁", "段景柱", "&张三", "11级李四", "12级小明"};

6、适配器：


/**** 联系人列表适配器*/
public class PersonRVAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {private List<Persons> mPersonsList;private static final int TYPE_HEADER = 0;private static final int TYPE_ITEM = 1;private static final int TYPE_FOOTER = 2;public PersonRVAdapter(List<Persons> personsList) {if (personsList == null) {throw new IllegalArgumentException("mRecentList must not be null");}mPersonsList = personsList;}@Overridepublic int getItemViewType(int position) {if (position == 0) {return TYPE_HEADER;} else if (position + 1 == getItemCount()) {return TYPE_FOOTER;} else {return TYPE_ITEM;}}@Overridepublic RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {if (viewType == TYPE_HEADER) {//头部项View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.contacts_rv_header, parent, false);HeaderViewHolder itemViewHolder = new HeaderViewHolder(itemView);return itemViewHolder;} else if (viewType == TYPE_ITEM) {//正常项View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.contacts_rv_item, parent, false);ItemViewHolder itemViewHolder = new ItemViewHolder(itemView);itemViewHolder.setIsRecyclable(true);return itemViewHolder;} else if (viewType == TYPE_FOOTER) {View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.contacts_rv_footer, parent, false);FooterViewHolder itemViewHolder = new FooterViewHolder(itemView);return itemViewHolder;}return null;}@Overridepublic void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {if (holder != null) {if (holder instanceof HeaderViewHolder) {((HeaderViewHolder) holder).iv_header_image.setBackgroundResource(R.drawable.person);((HeaderViewHolder) holder).tv_header_what.setText("0.0");} else if (holder instanceof ItemViewHolder) {Persons persons = mPersonsList.get(position);String str = null;//当前联系人姓名首字母char c = persons.getPinyin().charAt(0);String currentLetter = c + "";if (position == 2) {str =currentLetter;} else {String lastLetter = mPersonsList.get(position - 1).getPinyin().charAt(0) + "";if (!TextUtils.equals(currentLetter, lastLetter)) {str = currentLetter;}}//根据str是否为空与是否为字母决定是否显示字母栏if ((c >= 'A' && str != null && c <= 'Z') || position == 2) {((ItemViewHolder) holder).tv_letter.setVisibility(View.VISIBLE);((ItemViewHolder) holder).tv_letter.setText(str);} else {((ItemViewHolder) holder).tv_letter.setVisibility(View.GONE);}((ItemViewHolder) holder).iv_person_header.setBackgroundResource(R.mipmap.ic_launcher);((ItemViewHolder) holder).tv_person_name.setText(persons.getName());} else if (holder instanceof FooterViewHolder) {}}}@Overridepublic int getItemCount() {return mPersonsList.size();}/*** ItemViewHolder*/public static final class ItemViewHolder extends RecyclerView.ViewHolder {//首字母public TextView tv_letter;//头像public ImageView iv_person_header;//from whopublic TextView tv_person_name;public ItemViewHolder(View itemView) {super(itemView);iv_person_header = (ImageView) itemView.findViewById(R.id.iv_person_header);tv_person_name = (TextView) itemView.findViewById(R.id.tv_person_name);tv_letter = (TextView) itemView.findViewById(R.id.tv_letter);}}/*** HeaderViewHolder*/public static final class HeaderViewHolder extends RecyclerView.ViewHolder {//功能logopublic ImageView iv_header_image;//功能名public TextView tv_header_what;public HeaderViewHolder(View itemView) {super(itemView);iv_header_image = (ImageView) itemView.findViewById(R.id.iv_header_image);tv_header_what = (TextView) itemView.findViewById(R.id.tv_header_what);}}/*** FooterViewHolder*/public static final class FooterViewHolder extends RecyclerView.ViewHolder {//功能logopublic ImageView iv_footer_image;//功能名public TextView tv_footer_what;//字母栏public TextView tv_letter_footer;public FooterViewHolder(View itemView) {super(itemView);iv_footer_image = (ImageView) itemView.findViewById(R.id.iv_footer_image);tv_footer_what = (TextView) itemView.findViewById(R.id.tv_footer_what);tv_letter_footer= (TextView) itemView.findViewById(R.id.tv_letter_footer);}}}

7、联系人界面：

/*** 联系人界面*/public class ContactsFragment extends Fragment {private OnFragmentInteractionListener mListener;//索引viewprivate QuickIndexBar qib_bar;//联系人列表private List<Persons> mPersonsList;//索引弹窗private PopupWindow mPopupWindow;//handler 处理者private Handler mHandler = new Handler();//弹窗异步关闭private Thread mThread = new Thread() {@Overridepublic void run() {<span style="color:#ff0000;"> if (mPopupWindow != null)mPopupWindow.dismiss();mPopupWindow = null;</span>}};//联系人列表private RecyclerView rv_persons;//recycleView布局类型private LinearLayoutManager mLayoutManager;//recycleView适配器private PersonRVAdapter mRVAdapter;//当前可见首项private int currentFirstIndex = -1;//下拉刷新private SwipeRefreshLayout srl_contacts;public static ContactsFragment newInstance(String param1, String param2) {ContactsFragment fragment = new ContactsFragment();
//        Bundle args = new Bundle();
//        args.putString(ARG_PARAM1, param1);
//        args.putString(ARG_PARAM2, param2);
//        fragment.setArguments(args);return fragment;}public ContactsFragment() {// Required empty public constructor}@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//    findAllPersons();if (getArguments() != null) {
//            mParam1 = getArguments().getString(ARG_PARAM1);
//            mParam2 = getArguments().getString(ARG_PARAM2);}}/*** 真机测试，有联系人的情况下：* 填充数据*/
//    private void findAllPersons() {
//        Cursor cursor = getContext().getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
//        mPersonsList = new ArrayList<>();
//        if (cursor.moveToFirst()) {
//            do {
//                //获取联系人name
//                String name = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
//                Persons person = new Persons(name, R.mipmap.ic_launcher,"",0);
//                mPersonsList.add(person);
//            }while (cursor.moveToNext());
//        } else {
//            getDatas();
//        }
//        //根据name的首字母排序
//        Collections.sort(mPersonsList);
//    }/*** 非真机测试或者无数据情况下，读取备用数据*/
//    private void getDatas() {
//        if (ContactNames.NAMES.length != 0) {
//            for (String name : ContactNames.NAMES) {
//                Persons person = new Persons(name, R.mipmap.ic_launcher,"","0");
//                mPersonsList.add(person);
//            }
//        }
//    }@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {final View view = inflater.inflate(R.layout.main_fragment_contacts, container, false);srl_contacts= (SwipeRefreshLayout) view.findViewById(R.id.srl_contacts);srl_contacts.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {@Overridepublic void onRefresh() {srl_contacts.setRefreshing(false);}});//联系人列表rv_persons = (RecyclerView) view.findViewById(R.id.rv_persons);mLayoutManager = new LinearLayoutManager(getContext());//        mLayoutManager.setStackFromEnd(true);// mLayoutManager.setReverseLayout(true);rv_persons.setLayoutManager(mLayoutManager);rv_persons.setItemAnimator(new DefaultItemAnimator());//  rv_persons.setHasFixedSize(false);mRVAdapter = new PersonRVAdapter(mPersonsList);qib_bar = (QuickIndexBar) view.findViewById(R.id.qib_bar);// 字母按键回调qib_bar.setOnLetterUpdateListener(new QuickIndexBar.OnLetterUpdateListener() {View view = LayoutInflater.from(getContext()).inflate(R.layout.pop_contacts_layout, null);TextView tv_content = (TextView) view.findViewById(R.id.tv_content);@Overridepublic void onLetterUpdateListener(String letter) {<span style="color:#ff0000;">if (mPopupWindow != null) {tv_content.setText(letter);} else {mPopupWindow = new PopupWindow(view, 80, 80, false);mPopupWindow.showAtLocation(getActivity().getWindow().getDecorView(), Gravity.CENTER, 0, 0);}tv_content.setText(letter);</span>mHandler.removeCallbacks(mThread);mHandler.postDelayed(mThread, 1000);if (TextUtils.equals(letter, "↑") || TextUtils.equals(letter, "#")) {rv_persons.getLayoutManager().scrollToPosition(0);} else if (TextUtils.equals(letter, "☆")) {rv_persons.getLayoutManager().scrollToPosition(mPersonsList.size()-1);} else {//根据字母地位recycleViewfor (int i = 0; i < mPersonsList.size(); i++) {Persons person = mPersonsList.get(i);String where = person.getPinyin().charAt(0) + "";if (TextUtils.equals(letter, where)) {//判断是向上滑动还是向下滑动int currentLastPosition = mLayoutManager.findLastVisibleItemPosition();int currentFirstPosition = mLayoutManager.findFirstVisibleItemPosition();if (i > currentLastPosition) {//向下滑动int total = currentLastPosition - currentFirstPosition;rv_persons.getLayoutManager().scrollToPosition(i + total - 1);} else {//向上滑动rv_persons.getLayoutManager().scrollToPosition(i);}break;}}}}});rv_persons.addOnScrollListener(new RecyclerView.OnScrollListener() {@Overridepublic void onScrollStateChanged(RecyclerView recyclerView, int newState) {super.onScrollStateChanged(recyclerView, newState);<span style="color:#cc0000;">if (mPersonsList != null) {char c = mPersonsList.get(mLayoutManager.findFirstVisibleItemPosition()).getPinyin().charAt(0);currentFirstIndex = switchPinyin(c);//     if (newState == RecyclerView.SCROLL_STATE_IDLE) {qib_bar.setTouchIndex(currentFirstIndex);//   }</span>}}@Overridepublic void onScrolled(RecyclerView recyclerView, int dx, int dy) {super.onScrolled(recyclerView, dx, dy);}});rv_persons.setAdapter(mRVAdapter);return view;}public void onButtonPressed(Uri uri) {if (mListener != null) {mListener.onFragmentInteraction(uri);}}@Overridepublic void onAttach(Context context) {super.onAttach(context);try {mListener = (OnFragmentInteractionListener) context;} catch (ClassCastException e) {throw new ClassCastException(context.toString()+ " must implement OnFragmentInteractionListener");}}@Overridepublic void onDetach() {super.onDetach();mListener = null;}/*** 首字母转化成对应position** @param c 字母* @return*/private int switchPinyin(char c) {int switchNew = -1;if (c >= 'A' && c <= 'Z') {switchNew = 2;for (char cc = 'A'; cc <= 'Z'; cc++) {if (c == cc) {break;}switchNew++;}} else {switchNew = 1;}return switchNew;}}

好了，差不多就这样，大家如果在参考我的方法出错了，可以留言一下，方便大家一起进步！

最后在贴个他人使用expandableListView实现的连接：点击打开链接，

如果你希望一级列表展开且不能关闭，可以加入一下代码：

for (int i = 0; i < mGroupList.size(); i++) {mExpandableListView.expandGroup(i);}mExpandableListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {@Overridepublic boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {<span style="white-space:pre">  </span>   //group 点击事件进行拦截，不进行任何处理，就不会关闭了

<pre style="font-family: 宋体; font-size: 10.5pt; background-color: rgb(255, 255, 255);"><span style="white-space:pre">      </span>  v.setClickable(<span style="color:#000080;"><strong>false</strong></span>);

return true; } });

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