android：Log日志保存到本地

大家在开发一个应用进行调试的时候，查看log日志信息是必不可少的，因此log信息的保存是非常有必要的。下面是log日志保存的一个工具类，仅供参考。

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+"rn").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());
		}
	}
}

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