StringUtil.java

package com.base.utils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.graphics.Color;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.TextUtils;
import android.text.style.BackgroundColorSpan;

public class StringUtil {
	/**
	 * 将输入流转化成字符串
	 * 
	 * @param inputStream输入流
	 * @param encoding
	 *            字符编码类型,如果encoding传入null，则默认使用utf-8编码。
	 * @return 字符串
	 * @throws IOException
	 * @author lvmeng
	 */
	public static String inputToString(InputStream inputStream, String encoding)
			throws IOException {

		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len = 0;
		while ((len = inputStream.read(buffer)) != -1) {
			bos.write(buffer, 0, len);
		}
		inputStream.close();
		bos.close();
		if (TextUtils.isEmpty(encoding)) {
			encoding = "UTF-8";
		}
		return new String(bos.toByteArray(), encoding);
	}

	/**
	 * 设置需要高亮的字
	 * 
	 * @param wholeText
	 *            原始字符串
	 * @param spanableText
	 *            需要高亮的字符串
	 * @return 高亮后的字符串
	 */
	public static SpannableString getSpanableText(String wholeText,
			String spanableText) {
		if (TextUtils.isEmpty(wholeText))
			wholeText = "";
		SpannableString spannableString = new SpannableString(wholeText);
		if (spanableText.equals(""))
			return spannableString;
		wholeText = wholeText.toLowerCase();
		spanableText = spanableText.toLowerCase();
		int startPos = wholeText.indexOf(spanableText);
		if (startPos == -1) {
			int tmpLength = spanableText.length();
			String tmpResult = "";
			for (int i = 1; i <= tmpLength; i++) {
				tmpResult = spanableText.substring(0, tmpLength - i);
				int tmpPos = wholeText.indexOf(tmpResult);
				if (tmpPos == -1) {
					tmpResult = spanableText.substring(i, tmpLength);
					tmpPos = wholeText.indexOf(tmpResult);
				}
				if (tmpPos != -1)
					break;
				tmpResult = "";
			}
			if (tmpResult.length() != 0) {
				return getSpanableText(wholeText, tmpResult);
			} else {
				return spannableString;
			}
		}
		int endPos = startPos + spanableText.length();
		do {
			endPos = startPos + spanableText.length();
			spannableString.setSpan(new BackgroundColorSpan(Color.YELLOW),
					startPos, endPos, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
			startPos = wholeText.indexOf(spanableText, endPos);
		} while (startPos != -1);
		return spannableString;
	}
}