Android 通讯录的实现,根据拼音首字母快速索引到名字

导入依赖,或者自行百度下载jar包 compile 'com.belerweb:pinyin4j:2.5.0'

一、创建布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"><ListViewandroid:id="@+id/listview"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:scrollbars="none"></ListView><com.test.tong.CustomViewandroid:id="@+id/customView"android:layout_width="30dp"android:layout_height="match_parent"android:layout_marginBottom="5dp"android:layout_marginTop="5dp" /></LinearLayout>listView中的Item的布局<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><TextViewandroid:id="@+id/item_word"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="#c5bebe"android:padding="5dp"android:textSize="25sp" /><TextViewandroid:id="@+id/item_name"android:layout_width="match_parent"android:layout_height="wrap_content"android:padding="5dp"android:textSize="20sp" /></LinearLayout>

二、在ManiActivity中模拟人名,查找控件,设置适配器和一些监听等操作

public class MainActivity extends AppCompatActivity {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", "易宸锋"};private ListView listview;private CustomView custom;private ArrayList<person> list;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);listview = (ListView) findViewById(R.id.listview);custom = (CustomView) findViewById(R.id.customView);list = new ArrayList<>();for (int i = 0; i < NAMES.length; i++) {list.add(new person(NAMES[i]));}//设置适配器listview.setAdapter(new MyAdaper(list, this));//对list集合中的首字母进行排序Collections.sort(list, new Comparator<person>() {@Overridepublic int compare(person o1, person o2) {return o1.getHanderWord().compareTo(o2.getHanderWord());}});//自定义接口回调,拿到你点击的拼音导航custom.getDownData(new CustomView.DownData() {@Overridepublic void DownData(String str) {//循环判断点击的拼音导航栏和集合中姓名的首字母,如果相同Listview就跳转显示for (int i = 0; i < list.size(); i++) {if (list.get(i).getHanderWord().equals(str)) {listview.setSelection(i);break;//此处记得一定要停止循环,否则会下标错乱}}}});}
}

三、ListView的适配器

public class MyAdaper extends BaseAdapter {private List<person> list;private Context context;public MyAdaper(List<person> list, Context context) {this.list = list;this.context = context;}@Overridepublic int getCount() {return list.size();}@Overridepublic Object getItem(int position) {return list.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder = null;if (convertView == null) {convertView = View.inflate(context, R.layout.item, null);holder = new ViewHolder();holder.word = (TextView) convertView.findViewById(R.id.item_word);holder.name = (TextView) convertView.findViewById(R.id.item_name);convertView.setTag(holder);} else {holder = (ViewHolder) convertView.getTag();}String handerWord = list.get(position).getHanderWord();holder.word.setText(handerWord);//显示首字母导航,A,B,C...holder.name.setText(list.get(position).getName());//显示姓名//第一个字母显示if (position == 0) {holder.word.setVisibility(View.VISIBLE);} else {//然后判断当前姓名的首字母和上一个首字母是否相同,如果相同字母导航条就影藏,否则就显示if (handerWord.equals(list.get(position - 1).getHanderWord())) {holder.word.setVisibility(View.GONE);} else {holder.word.setVisibility(View.VISIBLE);}}return convertView;}class ViewHolder {TextView word;TextView name;}
}

四、自定义View展示右侧的名字首字母

public class CustomView extends View {public static String[] b = {"#", "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"};Paint paint = new Paint();public CustomView(Context context) {super(context);}public CustomView(Context context, @Nullable AttributeSet attrs) {super(context, attrs);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);//计算每一个字母的高度,总告诉除以字母集合的高度就可以int height = (getHeight()) / b.length;for (int i = 0; i < b.length; i++) {paint.setColor(Color.parseColor("#ff0000"));paint.setAntiAlias(true);//设置抗锯齿//设置文字大小paint.setTextSize(40);//设置字体加粗paint.setTypeface(Typeface.DEFAULT_BOLD);//计算每一个字母VIew的x轴坐标float paintX = getWidth() / 2 - paint.measureText(b[i]) / 2;//计算每一个字母的高度int paintY = height * i + height;//绘画出来这个TextViewcanvas.drawText(b[i], paintX, paintY, paint);//画完一个以后重置画笔paint.reset();}}@Overridepublic boolean onTouchEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:int down = (int) (event.getY() / getHeight() * b.length);if (down >= 0 && down < b.length) {downData.DownData(b[down]);}break;case MotionEvent.ACTION_MOVE:int move = (int) (event.getY() / getHeight() * b.length);if (move >= 0 && move < b.length) {downData.DownData(b[move]);}break;}return true;}private DownData downData;public void getDownData(DownData downData) {this.downData = downData;}public interface DownData {void DownData(String str);}
}

五、创建JavaBean来保存得到的姓名的拼音和拼音的首字母

public class person {private String name;private String pinyin;private String handerWord;public person(String name) {this.name = name;char c = name.charAt(0);//拿到姓名的第一个汉字this.pinyin = PinyinHelper.toHanyuPinyinStringArray(c)[0];//拿到名字的第一个汉字的拼音this.handerWord = pinyin.substring(0, 1).toUpperCase();//汉字拼音的首字母,变成大写}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPinyin() {return pinyin;}public void setPinyin(String pinyin) {this.pinyin = pinyin;}public String getHanderWord() {return handerWord;}public void setHanderWord(String handerWord) {this.handerWord = handerWord;}
}

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