先看Android仿微信通讯录列表侧边栏效果图
这是比较常见的效果了吧
列表根据首字符的拼音字母来排序，且可以通过侧边栏的字母索引来进行定位。
实现这样一个效果并不难，只要自定义一个索引View，然后引入一个可以对汉字进行拼音解析的jar包——pinyin4j-2.5.0即可
首先，先来定义侧边栏控件View，只要直接画出来即可。
字母选中项会变为红色，且滑动时背景会变色，此时SideBar并不包含居中的提示文本
public class SideBar extends View {
private Paint paint = new Paint();
private int choose = -1;
private boolean showBackground;
public static String[] letters = {"#", "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"};
private OnChooseLetterChangedListener onChooseLetterChangedListener;
public SideBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public SideBar(Context context, AttributeSet attrs) {
super(context, attrs);
}
public SideBar(Context context) {
super(context);
}
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (showBackground) {
canvas.drawColor(Color.parseColor("#D9D9D9"));
}
int height = getHeight();
int width = getWidth();
//平均每个字母占的高度
int singleHeight = height / letters.length;
for (int i = 0; i -1 && c -1 && c
SideBar只是画出了侧边栏索引条而已，不包含居中的提示文本，这个在另一个布局添加即可
public class HintSideBar extends RelativeLayout implements SideBar.OnChooseLetterChangedListener {
private TextView tv_hint;
private SideBar.OnChooseLetterChangedListener onChooseLetterChangedListener;
public HintSideBar(Context context, AttributeSet attrs) {
super(context, attrs);
LayoutInflater.from(context).inflate(R.layout.view_hint_side_bar, this);
initView();
}
private void initView() {
SideBar sideBar = (SideBar) findViewById(R.id.sideBar);
tv_hint = (TextView) findViewById(R.id.tv_hint);
sideBar.setOnTouchingLetterChangedListener(this);
}
@Override
public void onChooseLetter(String s) {
tv_hint.setText(s);
tv_hint.setVisibility(VISIBLE);
if (onChooseLetterChangedListener != null) {
onChooseLetterChangedListener.onChooseLetter(s);
}
}
@Override
public void onNoChooseLetter() {
tv_hint.setVisibility(INVISIBLE);
if (onChooseLetterChangedListener != null) {
onChooseLetterChangedListener.onNoChooseLetter();
}
}
public void setOnChooseLetterChangedListener(SideBar.OnChooseLetterChangedListener onChooseLetterChangedListener) {
this.OnChooseLetterChangedListener= onChooseLetterChangedListener;
}
}
HintSideBar通过回调接口来更新居中TextView的文本内容和可见性
使用到的布局
<&＃63;xml version="1.0" encoding="utf-8"&＃63;>
此时就完成了索引View的绘制，不过定位功能还需要再通过回调接口来完成。
引入jar包后，先来设定一个工具类，包含一个可以解析字符串的方法，返回值为首字符对应的拼音首字母或者为包含一个空格的char类型数据。
public class Utils {
/**
* 如果字符串的首字符为汉字，则返回该汉字的拼音大写首字母
* 如果字符串的首字符为字母，也转化为大写字母返回
* 其他情况均返回' '
*
* @param str 字符串
* @return 首字母
*/
public static char getHeadChar(String str) {
if (str != null && str.trim().length() != 0) {
char[] strChar = str.toCharArray();
char headChar = strChar[0];
//如果是大写字母则直接返回
if (Character.isUpperCase(headChar)) {
return headChar;
} else if (Character.isLowerCase(headChar)) {
return Character.toUpperCase(headChar);
}
// 汉语拼音格式输出类
HanyuPinyinOutputFormat hanYuPinOutputFormat = new HanyuPinyinOutputFormat();
hanYuPinOutputFormat.setCaseType(UPPERCASE);
hanYuPinOutputFormat.setToneType(WITHOUT_TONE);
if (String.valueOf(headChar).matches("[\\u4E00-\\u9FA5]+")) {
try {
String[] stringArray = PinyinHelper.toHanyuPinyinStringArray(headChar, hanYuPinOutputFormat);
if (stringArray != null && stringArray[0] != null) {
return stringArray[0].charAt(0);
}
} catch (BadHanyuPinyinOutputFormatCombination e) {
return ' ';
}
}
}
return ' ';
}
}
然后再定义一个实体类，包含用户名，电话，用户名首字符的拼音首字母等三个属性
需要实现Comparable 接口，用于排序
public class User implements Comparable {
private String userName;
private String phone;
private char headLetter;
public User(String userName, String phone) {
this.userName = userName;
this.phOne= phone;
headLetter = Utils.getHeadChar(userName);
}
public String getUserName() {
return userName;
}
public String getPhone() {
return phone;
}
public char getHeadLetter() {
return headLetter;
}
@Override
public boolean equals(Object object) {
if (this == object) {
return true;
}
if (object == null || getClass() != object.getClass()) {
return false;
}
User that = (User) object;
return getUserName().equals(that.getUserName()) && getPhone().equals(that.getPhone());
}
@Override
public int compareTo(Object object) {
if (object instanceof User) {
User that = (User) object;
if (getHeadLetter() == ' ') {
if (that.getHeadLetter() == ' ') {
return 0;
}
return -1;
}
if (that.getHeadLetter() == ' ') {
return 1;
} else if (that.getHeadLetter() > getHeadLetter()) {
return -1;
} else if (that.getHeadLetter() == getHeadLetter()) {
return 0;
}
return 1;
} else {
throw new ClassCastException();
}
}
}
主布局文件如下
<&＃63;xml version="1.0" encoding="utf-8"&＃63;>
联系人列表使用的是RecyclerView，还需要定义一个Adapter
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