AutoCompleteTextView实现联想输入

本文使用AutoCompleteTextView实现联想输入，实现了中文对应的拼音搜索、中文首字母搜索和中文搜索。下拉菜单使用了自定义的控件，可以自己设计样式，方便了项目中使用。自定义adapter实现Filterable接口，实现中文对应的拼音搜索、中文首字母搜索和中文搜索。其中使用了两个工具类，一个是中文转字母的工具类，一个是获取中文首字母的工具类，具体代码如下：

1、中文转换成对应的拼音

/**
* An object to convert Chinese character to its corresponding pinyin string. For characters with
* multiple possible pinyin string, only one is selected according to collator. Polyphone is not
* supported in this implementation. This class is implemented to achieve the best runtime
* performance and minimum runtime resources with tolerable sacrifice of accuracy. This
* implementation highly depends on zh_CN ICU collation data and must be always synchronized with
* ICU.
*
* Currently this file is aligned to zh.txt in ICU 4.6
*/
public class HanziToPinyin{

/**
* Unihans array. Each unihans is the first one within same pinyin. Use it to determine pinyin
* for all ~20k unihans.
*/
public static final char[] UNIHANS = {
'\u5475', '\u54ce', '\u5b89', '\u80ae', '\u51f9',
'\u516b', '\u6300', '\u6273', '\u90a6', '\u5305', '\u5351', '\u5954', '\u4f3b',
'\u5c44', '\u8fb9', '\u6807', '\u618b', '\u90a0', '\u69df', '\u7676', '\u5cec',
'\u5693', '\u5a47', '\u98e1', '\u4ed3', '\u64cd', '\u518a', '\u5d7e', '\u564c',
'\u53c9', '\u9497', '\u8fbf', '\u4f25', '\u6284', '\u8f66', '\u62bb', '\u67fd',
'\u5403', '\u5145', '\u62bd', '\u51fa', '\u6b3b', '\u63e3', '\u5ddd', '\u75ae',
'\u5439', '\u6776', '\u9034', '\u75b5', '\u5306', '\u51d1', '\u7c97', '\u6c46',
'\u5d14', '\u90a8', '\u6413', '\u5491', '\u5927', '\u75b8', '\u5f53', '\u5200',
'\u6dc2', '\u5f97', '\u6265', '\u706f', '\u6c10', '\u55f2', '\u7538', '\u5201',
'\u7239', '\u4ec3', '\u4e1f', '\u4e1c', '\u5517', '\u561f', '\u5073', '\u5806',
'\u9413', '\u591a', '\u5a40', '\u8bf6', '\u5940', '\u97a5', '\u800c', '\u53d1',
'\u5e06', '\u65b9', '\u98de', '\u5206', '\u4e30', '\u8985', '\u4ecf', '\u7d11',
'\u4f15', '\u65ee', '\u8be5', '\u7518', '\u5188', '\u768b', '\u6208', '\u7d66',
'\u6839', '\u5e9a', '\u5de5', '\u52fe', '\u4f30', '\u74dc', '\u7f6b', '\u5173',
'\u5149', '\u5f52', '\u886e', '\u5459', '\u54c8', '\u54b3', '\u9878', '\u82c0',
'\u84bf', '\u8bc3', '\u9ed2', '\u62eb', '\u4ea8', '\u5677', '\u543d', '\u9f41',
'\u5322', '\u82b1', '\u6000', '\u72bf', '\u5ddf', '\u7070', '\u660f', '\u5419',
'\u4e0c', '\u52a0', '\u620b', '\u6c5f', '\u827d', '\u9636', '\u5dfe', '\u52a4',
'\u5182', '\u52fc', '\u530a', '\u5a1f', '\u5658', '\u519b', '\u5494', '\u5f00',
'\u520a', '\u95f6', '\u5c3b', '\u533c', '\u524b', '\u80af', '\u962c', '\u7a7a',
'\u62a0', '\u5233', '\u5938', '\u84af', '\u5bbd', '\u5321', '\u4e8f', '\u5764',
'\u6269', '\u5783', '\u6765', '\u5170', '\u5577', '\u635e', '\u4ec2', '\u52d2',
'\u5844', '\u5215', '\u5006', '\u5941', '\u826f', '\u64a9', '\u5217', '\u62ce',
'\u3007', '\u6e9c', '\u9f99', '\u779c', '\u565c', '\u5a08', '\u7567', '\u62a1',
'\u7f57', '\u5463', '\u5988', '\u973e', '\u5ada', '\u9099', '\u732b', '\u9ebc',
'\u6c92', '\u95e8', '\u753f', '\u54aa', '\u7720', '\u55b5', '\u54a9', '\u6c11',
'\u540d', '\u8c2c', '\u6478', '\u54de', '\u6bea', '\u62cf', '\u5b7b', '\u56e1',
'\u56ca', '\u5b6c', '\u8bb7', '\u9981', '\u6041', '\u80fd', '\u59ae', '\u62c8',
'\u5b22', '\u9e1f', '\u634f', '\u60a8', '\u5b81', '\u599e', '\u519c', '\u7fba',
'\u5974', '\u597b', '\u8650', '\u632a', '\u5594', '\u8bb4', '\u8db4', '\u62cd',
'\u7705', '\u4e53', '\u629b', '\u5478', '\u55b7', '\u5309', '\u4e15', '\u504f',
'\u527d', '\u6c15', '\u59d8', '\u4e52', '\u948b', '\u5256', '\u4ec6', '\u4e03',
'\u6390', '\u5343', '\u545b', '\u6084', '\u767f', '\u4fb5', '\u9751', '\u909b',
'\u4e18', '\u66f2', '\u5f2e', '\u7f3a', '\u590b', '\u5465', '\u7a63', '\u5a06',
'\u60f9', '\u4eba', '\u6254', '\u65e5', '\u8338', '\u53b9', '\u5982', '\u5827',
'\u6875', '\u95f0', '\u82e5', '\u4ee8', '\u6be2', '\u4e09', '\u6852', '\u63bb',
'\u8272', '\u68ee', '\u50e7', '\u6740', '\u7b5b', '\u5c71', '\u4f24', '\u5f30',
'\u5962', '\u7533', '\u5347', '\u5c38', '\u53ce', '\u4e66', '\u5237', '\u6454',
'\u95e9', '\u53cc', '\u8c01', '\u542e', '\u5981', '\u53b6', '\u5fea', '\u635c',
'\u82cf', '\u72fb', '\u590a', '\u5b59', '\u5506', '\u4ed6', '\u82d4', '\u574d',
'\u94f4', '\u5932', '\u5fd1', '\u71a5', '\u5254', '\u5929', '\u4f7b', '\u5e16',
'\u5385', '\u56f2', '\u5077', '\u92c0', '\u6e4d', '\u63a8', '\u541e', '\u6258',
'\u6316', '\u6b6a', '\u5f2f', '\u5c2a', '\u5371', '\u586d', '\u7fc1', '\u631d',
'\u5140', '\u5915', '\u867e', '\u4eda', '\u4e61', '\u7071', '\u4e9b', '\u5fc3',
'\u661f', '\u51f6', '\u4f11', '\u65f4', '\u8f69', '\u75b6', '\u52cb', '\u4e2b',
'\u6079', '\u592e', '\u5e7a', '\u8036', '\u4e00', '\u6b2d', '\u5e94', '\u54df',
'\u4f63', '\u4f18', '\u625c', '\u9e22', '\u66f0', '\u6655', '\u531d', '\u707d',
'\u7ccc', '\u7242', '\u50ae', '\u5219', '\u8d3c', '\u600e', '\u5897', '\u5412',
'\u635a', '\u6cbe', '\u5f20', '\u948a', '\u8707', '\u8d1e', '\u4e89', '\u4e4b',
'\u4e2d', '\u5dde', '\u6731', '\u6293', '\u8de9', '\u4e13', '\u5986', '\u96b9',
'\u5b92', '\u5353', '\u5b5c', '\u5b97', '\u90b9', '\u79df', '\u94bb', '\u539c',
'\u5c0a', '\u6628', };

/**
* Pinyin array. Each pinyin is corresponding to unihans of same offset in the unihans array.
*/
public static final byte[][] PINYINS = {
{ 65, 0, 0, 0, 0, 0 }, { 65, 73, 0, 0, 0, 0 }, { 65, 78, 0, 0, 0, 0 },
{ 65, 78, 71, 0, 0, 0 }, { 65, 79, 0, 0, 0, 0 }, { 66, 65, 0, 0, 0, 0 },
{ 66, 65, 73, 0, 0, 0 }, { 66, 65, 78, 0, 0, 0 }, { 66, 65, 78, 71, 0, 0 },
{ 66, 65, 79, 0, 0, 0 }, { 66, 69, 73, 0, 0, 0 }, { 66, 69, 78, 0, 0, 0 },
{ 66, 69, 78, 71, 0, 0 }, { 66, 73, 0, 0, 0, 0 }, { 66, 73, 65, 78, 0, 0 },
{ 66, 73, 65, 79, 0, 0 }, { 66, 73, 69, 0, 0, 0 }, { 66, 73, 78, 0, 0, 0 },
{ 66, 73, 78, 71, 0, 0 }, { 66, 79, 0, 0, 0, 0 }, { 66, 85, 0, 0, 0, 0 },
{ 67, 65, 0, 0, 0, 0 }, { 67, 65, 73, 0, 0, 0 },
{ 67, 65, 78, 0, 0, 0 }, { 67, 65, 78, 71, 0, 0 }, { 67, 65, 79, 0, 0, 0 },
{ 67, 69, 0, 0, 0, 0 }, { 67, 69, 78, 0, 0, 0 }, { 67, 69, 78, 71, 0, 0 },
{ 67, 72, 65, 0, 0, 0 }, { 67, 72, 65, 73, 0, 0 }, { 67, 72, 65, 78, 0, 0 },
{ 67, 72, 65, 78, 71, 0 }, { 67, 72, 65, 79, 0, 0 }, { 67, 72, 69, 0, 0, 0 },
{ 67, 72, 69, 78, 0, 0 }, { 67, 72, 69, 78, 71, 0 }, { 67, 72, 73, 0, 0, 0 },
{ 67, 72, 79, 78, 71, 0 }, { 67, 72, 79, 85, 0, 0 }, { 67, 72, 85, 0, 0, 0 },
{ 67, 72, 85, 65, 0, 0 }, { 67, 72, 85, 65, 73, 0 }, { 67, 72, 85, 65, 78, 0 },
{ 67, 72, 85, 65, 78, 71 }, { 67, 72, 85, 73, 0, 0 }, { 67, 72, 85, 78, 0, 0 },
{ 67, 72, 85, 79, 0, 0 }, { 67, 73, 0, 0, 0, 0 }, { 67, 79, 78, 71, 0, 0 },
{ 67, 79, 85, 0, 0, 0 }, { 67, 85, 0, 0, 0, 0 }, { 67, 85, 65, 78, 0, 0 },
{ 67, 85, 73, 0, 0, 0 }, { 67, 85, 78, 0, 0, 0 }, { 67, 85, 79, 0, 0, 0 },
{ 68, 65, 0, 0, 0, 0 }, { 68, 65, 73, 0, 0, 0 }, { 68, 65, 78, 0, 0, 0 },
{ 68, 65, 78, 71, 0, 0 }, { 68, 65, 79, 0, 0, 0 }, { 68, 69, 0, 0, 0, 0 },
{ 68, 69, 73, 0, 0, 0 }, { 68, 69, 78, 0, 0, 0 }, { 68, 69, 78, 71, 0, 0 },
{ 68, 73, 0, 0, 0, 0 }, { 68, 73, 65, 0, 0, 0 }, { 68, 73, 65, 78, 0, 0 },
{ 68, 73, 65, 79, 0, 0 }, { 68, 73, 69, 0, 0, 0 }, { 68, 73, 78, 71, 0, 0 },
{ 68, 73, 85, 0, 0, 0 }, { 68, 79, 78, 71, 0, 0 }, { 68, 79, 85, 0, 0, 0 },
{ 68, 85, 0, 0, 0, 0 }, { 68, 85, 65, 78, 0, 0 }, { 68, 85, 73, 0, 0, 0 },
{ 68, 85, 78, 0, 0, 0 }, { 68, 85, 79, 0, 0, 0 }, { 69, 0, 0, 0, 0, 0 },
{ 69, 73, 0, 0, 0, 0 }, { 69, 78, 0, 0, 0, 0 }, { 69, 78, 71, 0, 0, 0 },
{ 69, 82, 0, 0, 0, 0 }, { 70, 65, 0, 0, 0, 0 }, { 70, 65, 78, 0, 0, 0 },
{ 70, 65, 78, 71, 0, 0 }, { 70, 69, 73, 0, 0, 0 }, { 70, 69, 78, 0, 0, 0 },
{ 70, 69, 78, 71, 0, 0 }, { 70, 73, 65, 79, 0, 0 }, { 70, 79, 0, 0, 0, 0 },
{ 70, 79, 85, 0, 0, 0 }, { 70, 85, 0, 0, 0, 0 }, { 71, 65, 0, 0, 0, 0 },
{ 71, 65, 73, 0, 0, 0 }, { 71, 65, 78, 0, 0, 0 }, { 71, 65, 78, 71, 0, 0 },
{ 71, 65, 79, 0, 0, 0 }, { 71, 69, 0, 0, 0, 0 }, { 71, 69, 73, 0, 0, 0 },
{ 71, 69, 78, 0, 0, 0 }, { 71, 69, 78, 71, 0, 0 }, { 71, 79, 78, 71, 0, 0 },
{ 71, 79, 85, 0, 0, 0 }, { 71, 85, 0, 0, 0, 0 }, { 71, 85, 65, 0, 0, 0 },
{ 71, 85, 65, 73, 0, 0 }, { 71, 85, 65, 78, 0, 0 }, { 71, 85, 65, 78, 71, 0 },
{ 71, 85, 73, 0, 0, 0 }, { 71, 85, 78, 0, 0, 0 }, { 71, 85, 79, 0, 0, 0 },
{ 72, 65, 0, 0, 0, 0 }, { 72, 65, 73, 0, 0, 0 }, { 72, 65, 78, 0, 0, 0 },
{ 72, 65, 78, 71, 0, 0 }, { 72, 65, 79, 0, 0, 0 }, { 72, 69, 0, 0, 0, 0 },
{ 72, 69, 73, 0, 0, 0 }, { 72, 69, 78, 0, 0, 0 }, { 72, 69, 78, 71, 0, 0 },
{ 72, 77, 0, 0, 0, 0 }, { 72, 79, 78, 71, 0, 0 }, { 72, 79, 85, 0, 0, 0 },
{ 72, 85, 0, 0, 0, 0 }, { 72, 85, 65, 0, 0, 0 }, { 72, 85, 65, 73, 0, 0 },
{ 72, 85, 65, 78, 0, 0 }, { 72, 85, 65, 78, 71, 0 }, { 72, 85, 73, 0, 0, 0 },
{ 72, 85, 78, 0, 0, 0 }, { 72, 85, 79, 0, 0, 0 }, { 74, 73, 0, 0, 0, 0 },
{ 74, 73, 65, 0, 0, 0 }, { 74, 73, 65, 78, 0, 0 }, { 74, 73, 65, 78, 71, 0 },
{ 74, 73, 65, 79, 0, 0 }, { 74, 73, 69, 0, 0, 0 }, { 74, 73, 78, 0, 0, 0 },
{ 74, 73, 78, 71, 0, 0 }, { 74, 73, 79, 78, 71, 0 }, { 74, 73, 85, 0, 0, 0 },
{ 74, 85, 0, 0, 0, 0 }, { 74, 85, 65, 78, 0, 0 }, { 74, 85, 69, 0, 0, 0 },
{ 74, 85, 78, 0, 0, 0 }, { 75, 65, 0, 0, 0, 0 }, { 75, 65, 73, 0, 0, 0 },
{ 75, 65, 78, 0, 0, 0 }, { 75, 65, 78, 71, 0, 0 }, { 75, 65, 79, 0, 0, 0 },
{ 75, 69, 0, 0, 0, 0 }, { 75, 69, 73, 0, 0, 0 }, { 75, 69, 78, 0, 0, 0 },
{ 75, 69, 78, 71, 0, 0 }, { 75, 79, 78, 71, 0, 0 }, { 75, 79, 85, 0, 0, 0 },
{ 75, 85, 0, 0, 0, 0 }, { 75, 85, 65, 0, 0, 0 }, { 75, 85, 65, 73, 0, 0 },
{ 75, 85, 65, 78, 0, 0 }, { 75, 85, 65, 78, 71, 0 }, { 75, 85, 73, 0, 0, 0 },
{ 75, 85, 78, 0, 0, 0 }, { 75, 85, 79, 0, 0, 0 }, { 76, 65, 0, 0, 0, 0 },
{ 76, 65, 73, 0, 0, 0 }, { 76, 65, 78, 0, 0, 0 }, { 76, 65, 78, 71, 0, 0 },
{ 76, 65, 79, 0, 0, 0 }, { 76, 69, 0, 0, 0, 0 }, { 76, 69, 73, 0, 0, 0 },
{ 76, 69, 78, 71, 0, 0 }, { 76, 73, 0, 0, 0, 0 }, { 76, 73, 65, 0, 0, 0 },
{ 76, 73, 65, 78, 0, 0 }, { 76, 73, 65, 78, 71, 0 }, { 76, 73, 65, 79, 0, 0 },
{ 76, 73, 69, 0, 0, 0 }, { 76, 73, 78, 0, 0, 0 }, { 76, 73, 78, 71, 0, 0 },
{ 76, 73, 85, 0, 0, 0 }, { 76, 79, 78, 71, 0, 0 }, { 76, 79, 85, 0, 0, 0 },
{ 76, 85, 0, 0, 0, 0 }, { 76, 85, 65, 78, 0, 0 }, { 76, 85, 69, 0, 0, 0 },
{ 76, 85, 78, 0, 0, 0 }, { 76, 85, 79, 0, 0, 0 }, { 77, 0, 0, 0, 0, 0 },
{ 77, 65, 0, 0, 0, 0 }, { 77, 65, 73, 0, 0, 0 }, { 77, 65, 78, 0, 0, 0 },
{ 77, 65, 78, 71, 0, 0 }, { 77, 65, 79, 0, 0, 0 }, { 77, 69, 0, 0, 0, 0 },
{ 77, 69, 73, 0, 0, 0 }, { 77, 69, 78, 0, 0, 0 }, { 77, 69, 78, 71, 0, 0 },
{ 77, 73, 0, 0, 0, 0 }, { 77, 73, 65, 78, 0, 0 }, { 77, 73, 65, 79, 0, 0 },
{ 77, 73, 69, 0, 0, 0 }, { 77, 73, 78, 0, 0, 0 }, { 77, 73, 78, 71, 0, 0 },
{ 77, 73, 85, 0, 0, 0 }, { 77, 79, 0, 0, 0, 0 }, { 77, 79, 85, 0, 0, 0 },
{ 77, 85, 0, 0, 0, 0 }, { 78, 65, 0, 0, 0, 0 }, { 78, 65, 73, 0, 0, 0 },
{ 78, 65, 78, 0, 0, 0 }, { 78, 65, 78, 71, 0, 0 }, { 78, 65, 79, 0, 0, 0 },
{ 78, 69, 0, 0, 0, 0 }, { 78, 69, 73, 0, 0, 0 }, { 78, 69, 78, 0, 0, 0 },
{ 78, 69, 78, 71, 0, 0 }, { 78, 73, 0, 0, 0, 0 }, { 78, 73, 65, 78, 0, 0 },
{ 78, 73, 65, 78, 71, 0 }, { 78, 73, 65, 79, 0, 0 }, { 78, 73, 69, 0, 0, 0 },
{ 78, 73, 78, 0, 0, 0 }, { 78, 73, 78, 71, 0, 0 }, { 78, 73, 85, 0, 0, 0 },
{ 78, 79, 78, 71, 0, 0 }, { 78, 79, 85, 0, 0, 0 }, { 78, 85, 0, 0, 0, 0 },
{ 78, 85, 65, 78, 0, 0 }, { 78, 85, 69, 0, 0, 0 }, { 78, 85, 79, 0, 0, 0 },
{ 79, 0, 0, 0, 0, 0 }, { 79, 85, 0, 0, 0, 0 }, { 80, 65, 0, 0, 0, 0 },
{ 80, 65, 73, 0, 0, 0 }, { 80, 65, 78, 0, 0, 0 }, { 80, 65, 78, 71, 0, 0 },
{ 80, 65, 79, 0, 0, 0 }, { 80, 69, 73, 0, 0, 0 }, { 80, 69, 78, 0, 0, 0 },
{ 80, 69, 78, 71, 0, 0 }, { 80, 73, 0, 0, 0, 0 }, { 80, 73, 65, 78, 0, 0 },
{ 80, 73, 65, 79, 0, 0 }, { 80, 73, 69, 0, 0, 0 }, { 80, 73, 78, 0, 0, 0 },
{ 80, 73, 78, 71, 0, 0 }, { 80, 79, 0, 0, 0, 0 }, { 80, 79, 85, 0, 0, 0 },
{ 80, 85, 0, 0, 0, 0 }, { 81, 73, 0, 0, 0, 0 }, { 81, 73, 65, 0, 0, 0 },
{ 81, 73, 65, 78, 0, 0 }, { 81, 73, 65, 78, 71, 0 }, { 81, 73, 65, 79, 0, 0 },
{ 81, 73, 69, 0, 0, 0 }, { 81, 73, 78, 0, 0, 0 }, { 81, 73, 78, 71, 0, 0 },
{ 81, 73, 79, 78, 71, 0 }, { 81, 73, 85, 0, 0, 0 }, { 81, 85, 0, 0, 0, 0 },
{ 81, 85, 65, 78, 0, 0 }, { 81, 85, 69, 0, 0, 0 }, { 81, 85, 78, 0, 0, 0 },
{ 82, 65, 78, 0, 0, 0 }, { 82, 65, 78, 71, 0, 0 }, { 82, 65, 79, 0, 0, 0 },
{ 82, 69, 0, 0, 0, 0 }, { 82, 69, 78, 0, 0, 0 }, { 82, 69, 78, 71, 0, 0 },
{ 82, 73, 0, 0, 0, 0 }, { 82, 79, 78, 71, 0, 0 }, { 82, 79, 85, 0, 0, 0 },
{ 82, 85, 0, 0, 0, 0 }, { 82, 85, 65, 78, 0, 0 }, { 82, 85, 73, 0, 0, 0 },
{ 82, 85, 78, 0, 0, 0 }, { 82, 85, 79, 0, 0, 0 }, { 83, 65, 0, 0, 0, 0 },
{ 83, 65, 73, 0, 0, 0 }, { 83, 65, 78, 0, 0, 0 }, { 83, 65, 78, 71, 0, 0 },
{ 83, 65, 79, 0, 0, 0 }, { 83, 69, 0, 0, 0, 0 }, { 83, 69, 78, 0, 0, 0 },
{ 83, 69, 78, 71, 0, 0 }, { 83, 72, 65, 0, 0, 0 }, { 83, 72, 65, 73, 0, 0 },
{ 83, 72, 65, 78, 0, 0 }, { 83, 72, 65, 78, 71, 0 }, { 83, 72, 65, 79, 0, 0 },
{ 83, 72, 69, 0, 0, 0 }, { 83, 72, 69, 78, 0, 0 }, { 83, 72, 69, 78, 71, 0 },
{ 83, 72, 73, 0, 0, 0 }, { 83, 72, 79, 85, 0, 0 }, { 83, 72, 85, 0, 0, 0 },
{ 83, 72, 85, 65, 0, 0 }, { 83, 72, 85, 65, 73, 0 }, { 83, 72, 85, 65, 78, 0 },
{ 83, 72, 85, 65, 78, 71 }, { 83, 72, 85, 73, 0, 0 }, { 83, 72, 85, 78, 0, 0 },
{ 83, 72, 85, 79, 0, 0 }, { 83, 73, 0, 0, 0, 0 }, { 83, 79, 78, 71, 0, 0 },
{ 83, 79, 85, 0, 0, 0 }, { 83, 85, 0, 0, 0, 0 }, { 83, 85, 65, 78, 0, 0 },
{ 83, 85, 73, 0, 0, 0 }, { 83, 85, 78, 0, 0, 0 }, { 83, 85, 79, 0, 0, 0 },
{ 84, 65, 0, 0, 0, 0 }, { 84, 65, 73, 0, 0, 0 }, { 84, 65, 78, 0, 0, 0 },
{ 84, 65, 78, 71, 0, 0 }, { 84, 65, 79, 0, 0, 0 }, { 84, 69, 0, 0, 0, 0 },
{ 84, 69, 78, 71, 0, 0 }, { 84, 73, 0, 0, 0, 0 }, { 84, 73, 65, 78, 0, 0 },
{ 84, 73, 65, 79, 0, 0 }, { 84, 73, 69, 0, 0, 0 }, { 84, 73, 78, 71, 0, 0 },
{ 84, 79, 78, 71, 0, 0 }, { 84, 79, 85, 0, 0, 0 }, { 84, 85, 0, 0, 0, 0 },
{ 84, 85, 65, 78, 0, 0 }, { 84, 85, 73, 0, 0, 0 }, { 84, 85, 78, 0, 0, 0 },
{ 84, 85, 79, 0, 0, 0 }, { 87, 65, 0, 0, 0, 0 }, { 87, 65, 73, 0, 0, 0 },
{ 87, 65, 78, 0, 0, 0 }, { 87, 65, 78, 71, 0, 0 }, { 87, 69, 73, 0, 0, 0 },
{ 87, 69, 78, 0, 0, 0 }, { 87, 69, 78, 71, 0, 0 }, { 87, 79, 0, 0, 0, 0 },
{ 87, 85, 0, 0, 0, 0 }, { 88, 73, 0, 0, 0, 0 }, { 88, 73, 65, 0, 0, 0 },
{ 88, 73, 65, 78, 0, 0 }, { 88, 73, 65, 78, 71, 0 }, { 88, 73, 65, 79, 0, 0 },
{ 88, 73, 69, 0, 0, 0 }, { 88, 73, 78, 0, 0, 0 }, { 88, 73, 78, 71, 0, 0 },
{ 88, 73, 79, 78, 71, 0 }, { 88, 73, 85, 0, 0, 0 }, { 88, 85, 0, 0, 0, 0 },
{ 88, 85, 65, 78, 0, 0 }, { 88, 85, 69, 0, 0, 0 }, { 88, 85, 78, 0, 0, 0 },
{ 89, 65, 0, 0, 0, 0 }, { 89, 65, 78, 0, 0, 0 }, { 89, 65, 78, 71, 0, 0 },
{ 89, 65, 79, 0, 0, 0 }, { 89, 69, 0, 0, 0, 0 }, { 89, 73, 0, 0, 0, 0 },
{ 89, 73, 78, 0, 0, 0 }, { 89, 73, 78, 71, 0, 0 }, { 89, 79, 0, 0, 0, 0 },
{ 89, 79, 78, 71, 0, 0 }, { 89, 79, 85, 0, 0, 0 }, { 89, 85, 0, 0, 0, 0 },
{ 89, 85, 65, 78, 0, 0 }, { 89, 85, 69, 0, 0, 0 }, { 89, 85, 78, 0, 0, 0 },
{ 90, 65, 0, 0, 0, 0 }, { 90, 65, 73, 0, 0, 0 }, { 90, 65, 78, 0, 0, 0 },
{ 90, 65, 78, 71, 0, 0 }, { 90, 65, 79, 0, 0, 0 }, { 90, 69, 0, 0, 0, 0 },
{ 90, 69, 73, 0, 0, 0 }, { 90, 69, 78, 0, 0, 0 }, { 90, 69, 78, 71, 0, 0 },
{ 90, 72, 65, 0, 0, 0 }, { 90, 72, 65, 73, 0, 0 }, { 90, 72, 65, 78, 0, 0 },
{ 90, 72, 65, 78, 71, 0 }, { 90, 72, 65, 79, 0, 0 }, { 90, 72, 69, 0, 0, 0 },
{ 90, 72, 69, 78, 0, 0 }, { 90, 72, 69, 78, 71, 0 }, { 90, 72, 73, 0, 0, 0 },
{ 90, 72, 79, 78, 71, 0 }, { 90, 72, 79, 85, 0, 0 }, { 90, 72, 85, 0, 0, 0 },
{ 90, 72, 85, 65, 0, 0 }, { 90, 72, 85, 65, 73, 0 }, { 90, 72, 85, 65, 78, 0 },
{ 90, 72, 85, 65, 78, 71 }, { 90, 72, 85, 73, 0, 0 }, { 90, 72, 85, 78, 0, 0 },
{ 90, 72, 85, 79, 0, 0 }, { 90, 73, 0, 0, 0, 0 }, { 90, 79, 78, 71, 0, 0 },
{ 90, 79, 85, 0, 0, 0 }, { 90, 85, 0, 0, 0, 0 }, { 90, 85, 65, 78, 0, 0 },
{ 90, 85, 73, 0, 0, 0 }, { 90, 85, 78, 0, 0, 0 }, { 90, 85, 79, 0, 0, 0 }, };

/** First and last Chinese character with known Pinyin according to zh collation */
private static final String FIRST_PINYIN_UNIHAN = "\u963F";
private static final String LAST_PINYIN_UNIHAN = "\u84D9";
/** The first Chinese character in Unicode block */
private static final char FIRST_UNIHAN = '\u3400';
private static final Collator COLLATOR = Collator.getInstance(Locale.CHINA);

private static HanziToPinyin sInstance;
private final boolean mHasChinaCollator;

public static class Token {
/**
* Separator between target string for each source char
*/
public static final String SEPARATOR = " ";

public static final int LATIN = 1;
public static final int PINYIN = 2;
public static final int UNKNOWN = 3;

public Token() {
}

public Token(int type, String source, String target) {
this.type = type;
this.source = source;
this.target = target;
}

/**
* Type of this token, ASCII, PINYIN or UNKNOWN.
*/
public int type;
/**
* Original string before translation.
*/
public String source;
/**
* Translated string of source. For Han, target is corresponding Pinyin. Otherwise target is
* original string in source.
*/
public String target;
}

protected HanziToPinyin(boolean hasChinaCollator) {
mHasChinaCollator = hasChinaCollator;
}

public static HanziToPinyin getInstance() {
synchronized (HanziToPinyin.class) {
if (sInstance != null) {
return sInstance;
}
// Check if zh_CN collation data is available
sInstance = new HanziToPinyin(true);
return sInstance;
}
}
private Token getToken(char character) {
Token token = new Token();
final String letter = Character.toString(character);
token.source = letter;
int offset = -1;
int cmp;
if (character < 256) {
token.type = Token.LATIN;
token.target = letter;
return token;
} else if (character < FIRST_UNIHAN) {
token.type = Token.UNKNOWN;
token.target = letter;
return token;
} else {
cmp = COLLATOR.compare(letter, FIRST_PINYIN_UNIHAN);
if (cmp < 0) {
token.type = Token.UNKNOWN;
token.target = letter;
return token;
} else if (cmp == 0) {
token.type = Token.PINYIN;
offset = 0;
} else {
cmp = COLLATOR.compare(letter, LAST_PINYIN_UNIHAN);
if (cmp > 0) {
token.type = Token.UNKNOWN;
token.target = letter;
return token;
} else if (cmp == 0) {
token.type = Token.PINYIN;
offset = UNIHANS.length - 1;
}
}
}

token.type = Token.PINYIN;
if (offset < 0) {
int begin = 0;
int end = UNIHANS.length - 1;
while (begin <= end) {
offset = (begin + end) / 2;
final String unihan = Character.toString(UNIHANS[offset]);
cmp = COLLATOR.compare(letter, unihan);
if (cmp == 0) {
break;
} else if (cmp > 0) {
begin = offset + 1;
} else {
end = offset - 1;
}
}
}
if (cmp < 0) {
offset--;
}
StringBuilder pinyin = new StringBuilder();
for (int j = 0; j < PINYINS[offset].length && PINYINS[offset][j] != 0; j++) {
pinyin.append((char) PINYINS[offset][j]);
}
token.target = pinyin.toString();
return token;
}

/**
* Convert the input to a array of tokens. The sequence of ASCII or Unknown characters without
* space will be put into a Token, One Hanzi character which has pinyin will be treated as a
* Token. If these is no China collator, the empty token array is returned.
*/
public ArrayList<Token> get(final String input) {
ArrayList<Token> tokens = new ArrayList<Token>();
if (!mHasChinaCollator || TextUtils.isEmpty(input)) {
// return empty tokens.
return tokens;
}
final int inputLength = input.length();
final StringBuilder sb = new StringBuilder();
int tokenType = Token.LATIN;
// Go through the input, create a new token when
// a. Token type changed
// b. Get the Pinyin of current charater.
// c. current character is space.
for (int i = 0; i < inputLength; i++) {
final char character = input.charAt(i);
if (character == ' ') {
if (sb.length() > 0) {
addToken(sb, tokens, tokenType);
}
} else if (character < 256) {
if (tokenType != Token.LATIN && sb.length() > 0) {
addToken(sb, tokens, tokenType);
}
tokenType = Token.LATIN;
sb.append(character);
} else if (character < FIRST_UNIHAN) {
if (tokenType != Token.UNKNOWN && sb.length() > 0) {
addToken(sb, tokens, tokenType);
}
tokenType = Token.UNKNOWN;
sb.append(character);
} else {
Token t = getToken(character);
if (t.type == Token.PINYIN) {
if (sb.length() > 0) {
addToken(sb, tokens, tokenType);
}
tokens.add(t);
tokenType = Token.PINYIN;
} else {
if (tokenType != t.type && sb.length() > 0) {
addToken(sb, tokens, tokenType);
}
tokenType = t.type;
sb.append(character);
}
}
}
if (sb.length() > 0) {
addToken(sb, tokens, tokenType);
}
return tokens;
}

private void addToken(
final StringBuilder sb, final ArrayList<Token> tokens, final int tokenType) {
String str = sb.toString();
tokens.add(new Token(tokenType, str, str));
sb.setLength(0);
}

public String getBlendString(final String input){
StringBuffer sb = new StringBuffer();
ArrayList<Token>  tokens = get(input);
for(Token token : tokens){

sb.append(" "+token.target +" " + token.source+" ");

sb.append(token.source);
}
return sb.toString();
}
}

public class PinYin{

//汉字返回拼音，字母原样返回，都转换为小写
public static String getPinYin(String input) {
ArrayList<Token> tokens = HanziToPinyin.getInstance().get(input);
StringBuilder sb = new StringBuilder();
if (tokens != null && tokens.size() > 0) {
for (Token token : tokens) {
if (Token.PINYIN == token.type) {
sb.append(token.target);
} else {
sb.append(token.source);
}
}
}
return sb.toString().toLowerCase();
}
}

1.1程序中把中文转换成拼音

String pinyin=PinYin.getPinYin(name);

把需要转换的中文放到name即可。

2 中文转换成对应的首字母

public class FirstLetter {
static final int GB_SP_DIFF = 160;
// 存放国标一级汉字不同读音的起始区位码
static final int[] secPosValueList = { 1601, 1637, 1833, 2078, 2274, 2302,
2433, 2594, 2787, 3106, 3212, 3472, 3635, 3722, 3730, 3858, 4027,
4086, 4390, 4558, 4684, 4925, 5249, 5600 };
// 存放国标一级汉字不同读音的起始区位码对应读音
static final char[] firstLetter = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'w', 'x',
'y', 'z' };

/**
* 获取汉字首字母
* @param characters
* @return 汉字首字母
*/
public static String getSpells(String characters) {
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < characters.length(); i++) {

char ch = characters.charAt(i);
if ((ch >> 7) == 0) {
// 判断是否为汉字，如果左移7为为0就不是汉字，否则是汉字
} else {
char spell = getFirstLetter(ch);
buffer.append(String.valueOf(spell));
}
}
return buffer.toString();
}

// 获取一个汉字的首字母
public static Character getFirstLetter(char ch) {

byte[] uniCode = null;
try {
uniCode = String.valueOf(ch).getBytes("GBK");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return null;
}
if (uniCode[0] < 128 && uniCode[0] > 0) { // 非汉字
return null;
} else {
return convert(uniCode);
}
}

/**
* 获取一个汉字的拼音首字母。 GB码两个字节分别减去160，转换成10进制码组合就可以得到区位码
* 例如汉字“你”的GB码是0xC4/0xE3，分别减去0xA0（160）就是0x24/0x43
* 0x24转成10进制就是36，0x43是67，那么它的区位码就是3667，在对照表中读音为‘n’
*/
static char convert(byte[] bytes) {
char result = '-';
int secPosValue = 0;
int i;
for (i = 0; i < bytes.length; i++) {
bytes[i] -= GB_SP_DIFF;
}
secPosValue = bytes[0] * 100 + bytes[1];
for (i = 0; i < 23; i++) {
if (secPosValue >= secPosValueList[i]
&& secPosValue < secPosValueList[i + 1]) {
result = firstLetter[i];
break;
}
}
return result;
}

}

2.1程序中把中文转换成对应的首字母

String first=FirstLetter.getSpells(name);

把需要转换的中文放到name的位置就可以了

3AutoCompleteTextView的Adapter

public class AutoAdapter extends BaseAdapter implements Filterable{
private List<Book> books;
private Context context;
private ArrayFilter mArrayFilter;
private ArrayList<Book> mFilterBooks;
public AutoAdapter(List<Book> books,Context context){
this.context=context;
if(books==null){
this.books=new ArrayList<Book>();
}else{
this.books=books;
}
}
@Override
public int getCount() {
return books.size();
}

@Override
public Object getItem(int position) {
return books.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if (convertView == null) {
viewHolder = new ViewHolder();
//          convertView = LayoutInflater.from(context).inflate(
//                  R.layout.act_item, null);
convertView = LayoutInflater.from(context).inflate(R.layout.act_item, null);
viewHolder.id = (TextView) convertView.findViewById(R.id.id_book);
viewHolder.name = (TextView) convertView
.findViewById(R.id.name_book);
viewHolder.author = (TextView) convertView
.findViewById(R.id.author_book);
viewHolder.price = (TextView) convertView
.findViewById(R.id.price_book);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
Book book = books.get(position);
viewHolder.id.setText(book.getId() + "");
viewHolder.name.setText(book.getName());
viewHolder.author.setText(book.getAuthor());
viewHolder.price.setText(book.getPrice()+"");
return convertView;
}

class ViewHolder {
TextView id, name, author, price;
}

@Override
public Filter getFilter() {
if(mArrayFilter==null){
mArrayFilter = new ArrayFilter();
}
return mArrayFilter;
}
private class ArrayFilter extends Filter {

@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (mFilterBooks == null) {
mFilterBooks = new ArrayList<Book>(books);
}
//如果没有过滤条件则不过滤
if (constraint == null || constraint.length() == 0) {
results.values = mFilterBooks;
results.count = mFilterBooks.size();
} else {
List<Book> retList = new ArrayList<Book>();
//过滤条件
String str = constraint.toString().toLowerCase();
//循环变量数据源，如果有属性满足过滤条件，则添加到result中
for (Book book : mFilterBooks) {
if (book.getAuthor().contains(str)
|| book.getName().contains(str)
|| (book.getId() + "").contains(str)
|| (book.getPrice() + "").contains(str)||book.getPinyin(book.name).startsWith(str)||FirstLetter.getSpells(book.name).startsWith(str)) {
retList.add(book);
}
}
results.values = retList;
results.count = retList.size();
}
return results;
}

//在这里返回过滤结果
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
//          notifyDataSetInvalidated()，会重绘控件（还原到初始状态）
//          notifyDataSetChanged()，重绘当前可见区域
books = (List<Book>) results.values;
if(results.count>0){
notifyDataSetChanged();
}else{
notifyDataSetInvalidated();
}
}

}
}

3.1Adapter使用的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="horizontal" >

<TextView
android:id="@+id/id_book"
android:layout_width="0dp"
android:layout_height="48dp"
android:layout_weight="1"
android:gravity="center"
android:text="id" />

<TextView
android:id="@+id/name_book"
android:layout_width="0dp"
android:layout_height="48dp"
android:layout_weight="1"
android:gravity="center"
android:text="name" />

<TextView
android:id="@+id/author_book"
android:layout_width="0dp"
android:layout_height="48dp"
android:layout_weight="1"
android:gravity="center"
android:text="author" />

<TextView
android:id="@+id/price_book"
android:layout_width="0dp"
android:layout_height="48dp"
android:layout_weight="1"
android:gravity="center"
android:text="price" />

</LinearLayout>

4.AutoCompleteTextView下拉菜单实体类

public class Book {
public String name;
public String author;
public int id;
public double price;

public Book(int i, String string, String string2, int j) {
// TODO Auto-generated constructor stub
this.id=i;
this.name=string;
this.author=string2;
this.price=j;

}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getAuthor() {
return author;
}

public void setAuthor(String author) {
this.author = author;
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public double getPrice() {
return price;
}

public void setPrice(double price) {
this.price = price;
}

public String getPinyin(String name) {
// TODO Auto-generated method stub
String pinyin=PinYin.getPinYin(name);
Log.d("name",name);
Log.d("py",pinyin);
return pinyin;
}
}

5.主程序代码

public class MainActivity extends Activity {
private AutoCompleteTextView auto;
private AutoAdapter adpter;
private List<Book> books;
private Activity ac;
private EditText et;
private TextView tv;
private Button bt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ac=this;
initData();
auto=(AutoCompleteTextView) findViewById(R.id.auto);
et=(EditText) findViewById(R.id.edittext);
tv=(TextView) findViewById(R.id.textview);
bt=(Button) findViewById(R.id.button);
adpter=new AutoAdapter(books, ac);
auto.setAdapter(adpter);
//      至少需要输入一个字才会显示下拉表;默认值为2.
auto.setThreshold(1);
auto.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
Book book=(Book)parent.getItemAtPosition(position);
auto.setText(book.name);
}
});

bt.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String s=   FirstLetter.getSpells(et.getText().toString());
tv.setText(s);
}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private void initData() {
books=new ArrayList<Book>();
Book b1 = new Book(1, "三国演义", "罗贯中", 38);
Log.d("book", b1.getName());
Book b2 = new Book(2, "红楼梦", "曹雪芹", 25);
Book b3 = new Book(3, "西游记", "吴承恩", 43);
Book b4 = new Book(4, "水浒传", "施耐庵", 72);
Book b5 = new Book(5, "随园诗话", "袁枚", 32);
Book b6 = new Book(6, "说文解字", "许慎", 14);
Book b7 = new Book(7, "文心雕龙", "刘勰", 18);
books.add(b1);
books.add(b2);
books.add(b3);
books.add(b4);
books.add(b5);
books.add(b6);
books.add(b7);
}
}

6.主程序布局代码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical" >
<AutoCompleteTextView
android:id="@+id/auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp"
/>

<EditText
android:id="@+id/edittext"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="输入汉字"
/>
<Button
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="获取汉字首字母"
/>
<TextView
android:id="@+id/textview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>