android：Log日志保存到本地

package com.dandy.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.text.SimpleDateFormat;
import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Environment;
import android.text.TextUtils;

/**
*
* @author Administrator
*
* log打印日志保存,文件的保存以小时为单位
* permission:<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
*			  <uses-permission android:name="android.permission.READ_LOGS" />
*/
public class LogCatHelper {
private static LogCatHelper instance = null;
private String dirPath;//保存路径
private int appid;//应用pid
private Thread logThread;

/**
* @param mContext
* @param path log日志保存根目录
* @return
*/
public static LogCatHelper getInstance(Context mContext,String path){
if(instance == null){
instance = new LogCatHelper(mContext,path);
}
return instance;
}

private LogCatHelper(Context mContext,String path) {
appid = android.os.Process.myPid();
if(TextUtils.isEmpty(path)){
dirPath = Environment.getExternalStorageDirectory().getAbsolutePath()
+File.separator+"seeker"+File.separator+mContext.getPackageName();
}else{
dirPath = path;
}
File dir = new File(dirPath);
if(!dir.exists()){
dir.mkdirs();
}
}

/**
* 启动log日志保存
*/
public void start(){
if(logThread == null){
logThread = new Thread(new LogRunnable(appid, dirPath));
}
logThread.start();
}

private static class LogRunnable implements Runnable{

private Process mProcess;
private FileOutputStream fos;
private BufferedReader mReader;
private String cmds;
private String mPid;

public LogRunnable(int pid,String dirPath) {
this.mPid = ""+pid;
try {
File file = new File(dirPath,FormatDate.getFormatDate()+".log");
if(!file.exists()){
file.createNewFile();
}
fos = new FileOutputStream(file,true);
} catch (Exception e) {
e.printStackTrace();
}
cmds = "logcat *:v | grep \"(" + mPid + ")\"";
}

@Override
public void run() {
try {
mProcess = Runtime.getRuntime().exec(cmds);
mReader = new BufferedReader(new InputStreamReader(mProcess.getInputStream()),1024);
String line;
while((line = mReader.readLine()) != null){
if(line.length() == 0){
continue;
}
if(fos != null && line.contains(mPid)){
fos.write((FormatDate.getFormatTime()+"	"+line+"\r\n").getBytes());
}
}
} catch (Exception e) {
e.printStackTrace();
}finally{
if(mProcess != null){
mProcess.destroy();
mProcess = null;
}
try {
if(mReader != null){
mReader.close();
mReader = null;
}
if(fos != null){
fos.close();
fos = null;
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
}
}

@SuppressLint("SimpleDateFormat")
private static class FormatDate{

public static String getFormatDate(){
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHH");
return sdf.format(System.currentTimeMillis());
}

public static String getFormatTime(){
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(System.currentTimeMillis());
}
}
}