<span style="font-family:KaiTi_GB2312;font-size:18px;"><RelativeLayout 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"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context=".MainActivity"><TextViewandroid:id="@+id/tv"android:textSize="30sp"android:layout_centerVertical="true"android:layout_centerHorizontal="true"android:layout_width="wrap_content"android:layout_height="wrap_content" /><EditTextandroid:textSize="30sp"android:layout_below="@+id/tv"android:id="@+id/et"android:layout_centerHorizontal="true"android:layout_centerVertical="true"android:layout_width="match_parent"android:layout_height="wrap_content" /><Buttonandroid:layout_centerVertical="true"android:layout_centerHorizontal="true"android:layout_below="@+id/et"android:onClick="click"android:text="开始转换"android:layout_width="match_parent"android:layout_height="wrap_content" /></RelativeLayout>
</span>

Pinyin.java

<span style="font-family:KaiTi_GB2312;font-size:18px;">package com.example.yu_longji.android29;/*** Created by yu_longji on 2015/9/1.*/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.HanyuPinyinVCharType;
import net.sourceforge.pinyin4j.format.exception.BadHanyuPinyinOutputFormatCombination;import java.util.HashSet;
import java.util.Set;/*** Created by yu_longji on 2015/8/31.*/
public class Pinyin {public static String makeStringByStringSet(Set<String> stringSet) {StringBuilder str = new StringBuilder();int i = 0;for (String s : stringSet) {if (i == stringSet.size() - 1) {str.append(s);} else {str.append(s + ",");}i++;}return str.toString().toLowerCase();}/*** 获取拼音集合**/public static Set<String> getPinyin(String src) {if (src != null && !src.trim().equalsIgnoreCase("")) {char[] srcChar;srcChar = src.toCharArray();//汉语拼音格式输出类HanyuPinyinOutputFormat hanYuPinOutputFormat = new HanyuPinyinOutputFormat();//输出设置，大小写，音标方式等hanYuPinOutputFormat.setCaseType(HanyuPinyinCaseType.UPPERCASE);hanYuPinOutputFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);hanYuPinOutputFormat.setVCharType(HanyuPinyinVCharType.WITH_U_UNICODE);String[][] temp = new String[src.length()][];for (int i = 0; i < srcChar.length; i++) {char c = srcChar[i];//是中文或者a-z或者A-Z转换拼音(我的需求，是保留中文或者a-z或者A-Z)if (String.valueOf(c).matches("[\\u4E00-\\u9FA5]+")) {try {temp[i] = PinyinHelper.toHanyuPinyinStringArray(srcChar[i], hanYuPinOutputFormat);} catch (BadHanyuPinyinOutputFormatCombination e) {e.printStackTrace();}} else if (((int) c >= 65 && (int) c <= 90) || ((int) c >= 97 && (int) c <= 122)) {temp[i] = new String[]{String.valueOf(srcChar[i])};} else {temp[i] = new String[]{""};}}String[] pingyinArray = Exchange(temp);Set<String> pinyinSet = new HashSet<String>();for (int i = 0; i < pingyinArray.length; i++) {pinyinSet.add(pingyinArray[i]);}return pinyinSet;}return null;}/*** 递归**/public static String[] Exchange(String[][] strJaggedArray) {String[][] temp = DoExchange(strJaggedArray);return temp[0];}/*** 递归**/private static String[][] DoExchange(String[][] strJaggedArray) {int len = strJaggedArray.length;if (len >= 2) {int len1 = strJaggedArray[0].length;int len2 = strJaggedArray[1].length;int newlen = len1 * len2;String[] temp = new String[newlen];int Index = 0;for (int i = 0; i < len1; i++) {for (int j = 0; j < len2; j++) {temp[Index] = strJaggedArray[0][i] + strJaggedArray[1][j];Index++;}}String[][] newArray = new String[len - 1][];for (int i = 2; i < len; i++) {newArray[i - 1] = strJaggedArray[i];}newArray[0] = temp;return DoExchange(newArray);} else {return strJaggedArray;}}}</span>

<span style="font-family:KaiTi_GB2312;font-size:18px;">package com.example.yu_longji.android29;import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;public class MainActivity extends Activity {TextView tv;EditText et;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tv = (TextView)findViewById(R.id.tv);et = (EditText)findViewById(R.id.et);}public void click(View view){String str =  et.getText().toString().trim();tv.setText(Pinyin.makeStringByStringSet(Pinyin.getPinyin(str)));}}
</span>