获得汉字拼音的首字母

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/edit"
android:hint="输入汉字"
></EditText>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/button"
android:text="@string/button"
></Button>
<TextView
android:id="@+id/textView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
></TextView>
</LinearLayout>

package com.hanzi;
import java.io.UnsupportedEncodingException;
import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class hanzi extends Activity {
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' };
private EditText edit;
private TextView text;
private Button button;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
edit = (EditText)this.findViewById(R.id.edit);
text = (TextView)this.findViewById(R.id.textView);
button = (Button)this.findViewById(R.id.button);
button.setOnClickListener(buttonListener);
text.setText("拼音");
edit.addTextChangedListener(new TextWatcher() {

public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
String characters = s.toString();
String spells = getSpells(characters);
text.setText(spells);
}

public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub

}

public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub

}
});
}
private View.OnClickListener buttonListener = new View.OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub
if(v==button){
String characters = edit.getText().toString();
String spells = getSpells(characters);
text.setText(spells);
}
}
};

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 < secPosValueList.length; i++) {
if (secPosValue >= secPosValueList[i] && secPosValue < secPosValueList[i + 1]) {
result = firstLetter[i];
break;
}
}
return result;
}
}