log信息

 相信你们在作应用调试的时候,不可能时时经过USB线连着电脑去查看log信息,因此,将应用的log信息保存到手机本地就颇有必要了,有助咱们从这些log信息中提取有用的部分,以解决一些bug,下面我把网上分享的代码中做了一些精简,做为开发者使用,我的以为不必经过用户上传给咱们,用户上传的不须要这么庞大的log信息,仅仅那部分崩溃的log信息便可,可参考个人另一篇blog:http://www.eoeandroid.com/thread-247560-1-1.html 好了,废话很少说,直接分享封装好的log信息类:LogcatHelper

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代码片断,双击复制
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package com.way.util;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import android.content.Context;
import android.os.Environment;
/**
* log日志统计保存
*
* @author way
*
*/
public class LogcatHelper {
private static LogcatHelper INSTANCE = null ;
private static String PATH_LOGCAT;
private LogDumper mLogDumper = null ;
private int mPId;
/**
*
* 初始化目录
*
* */
public void init(Context context) {
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) { // 优先保存到SD卡中
PATH_LOGCAT = Environment.getExternalStorageDirectory()
.getAbsolutePath() + File.separator + "miniGPS" ;
} else { // 若是SD卡不存在,就保存到本应用的目录下
PATH_LOGCAT = context.getFilesDir().getAbsolutePath()
+ File.separator + "miniGPS" ;
}
File file = new File(PATH_LOGCAT);
if (!file.exists()) {
file.mkdirs();
}
}
public static LogcatHelper getInstance(Context context) {
if (INSTANCE == null ) {
INSTANCE = new LogcatHelper(context);
}
return INSTANCE;
}
private LogcatHelper(Context context) {
init(context);
mPId = android.os.Process.myPid();
}
public void start() {
if (mLogDumper == null )
mLogDumper = new LogDumper(String.valueOf(mPId), PATH_LOGCAT);
mLogDumper.start();
}
public void stop() {
if (mLogDumper != null ) {
mLogDumper.stopLogs();
mLogDumper = null ;
}
}
private class LogDumper extends Thread {
private Process logcatProc;
private BufferedReader mReader = null ;
private boolean mRunning = true ;
String cmds = null ;
private String mPID;
private FileOutputStream out = null ;
public LogDumper(String pid, String dir) {
mPID = pid;
try {
out = new FileOutputStream( new File(dir, "GPS-"
+ MyDate.getFileName() + ".log" ));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
/**
*
* 日志等级:*:v , *:d , *:w , *:e , *:f , *:s
*
* 显示当前mPID程序的 E和W等级的日志.
*
* */
// cmds = "logcat *:e *:w | grep \"(" + mPID + ")\"";
// cmds = "logcat | grep \"(" + mPID + ")\"";//打印全部日志信息
// cmds = "logcat -s way";//打印标签过滤信息
cmds = "logcat *:e *:i | grep \"(" + mPID + ")\"" ;
}
public void stopLogs() {
mRunning = false ;
}
@Override
public void run() {
try {
logcatProc = Runtime.getRuntime().exec(cmds);
mReader = new BufferedReader( new InputStreamReader(
logcatProc.getInputStream()), 1024 );
String line = null ;
while (mRunning && (line = mReader.readLine()) != null ) {
if (!mRunning) {
break ;
}
if (line.length() == 0 ) {
continue ;
}
if (out != null && line.contains(mPID)) {
out.write((MyDate.getDateEN() + " " + line + "\n" )
.getBytes());
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (logcatProc != null ) {
logcatProc.destroy();
logcatProc = null ;
}
if (mReader != null ) {
try {
mReader.close();
mReader = null ;
} catch (IOException e) {
e.printStackTrace();
}
}
if (out != null ) {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
out = null ;
}
}
}
}
}


记得加上权限:

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代码片断,双击复制
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<uses-permission android:name= "android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name= "android.permission.READ_LOGS" />



另外把那个时间的工具类也分享一下:
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package com.way.util;
import java.text.SimpleDateFormat;
import java.util.Date;
public class MyDate {
public static String getFileName() {
SimpleDateFormat format = new SimpleDateFormat( "yyyy-MM-dd" );
String date = format.format( new Date(System.currentTimeMillis()));
return date; // 2012年10月03日 23:41:31
}
public static String getDateEN() {
SimpleDateFormat format1 = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss" );
String date1 = format1.format( new Date(System.currentTimeMillis()));
return date1; // 2012-10-03 23:41:31
}
}


OK,全部事情作完以后,在咱们的应用中start一下就OK了,使用完以后,记得调用一下stop:
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public class GPSApplication extends Application {
@Override
public void onCreate() {
// TODO Auto-generated method stub
LogcatHelper.getInstance( this ).start();
}  
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