Log输出到sdcard工具类

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package com.innofidei;import java.io.File;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;public class LocatUtil {private static String logToFileCommand = "logcat -v time -f ";public static void startLog(String saveiDir, String fileName) {SimpleDateFormat format = new SimpleDateFormat("yyMMdd_HHmmss");String nowStr = format.format(new Date());fileName = fileName + "_" + nowStr + ".txt";new File(saveiDir).mkdirs();try {Runtime.getRuntime().exec(logToFileCommand + saveiDir + fileName);} catch (IOException e) {e.printStackTrace();}}}