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();
		}
	}
}