Android将应用log信息保存文件

package com.tongseng.lgocat;import android.content.Context;import android.os.Environment;import java.io.BufferedReader;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStreamReader;/** * Created by tongsheng on 2016/7/19. *//** * 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 + "MyAPPLog";} else {// 如果SD卡不存在，就保存到本应用的目录下PATH_LOGCAT = context.getFilesDir().getAbsolutePath()+ File.separator + "VSLink";}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, "Logcat-"+ LogcatDate.getFileName()+ ".log"));} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.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 + ")\"";//打印所有日志信息// cmds = "logcat -s way";//打印标签过滤信息//cmds = "logcat *:e *:i | grep \"(" + mPID + ")\"";}public void stopLogs() {mRunning = false;}@Overridepublic 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((LogcatDate.getFileName() + "  " + 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：

<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：

package com.tongseng.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;     }        public static String getDateEN() {          SimpleDateFormat format1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");          String date1 = format1.format(new Date(System.currentTimeMillis()));          return date1;    }    }  

OK，所有事情做完之后，在我们的应用中start一下就OK了，使用完之后，记得调用一下stop：

package com.tongseng.logcat;import android.app.Application;import android.os.Handler;public class RemoteApplication extends Application {@Overridepublic void onCreate() {super.onCreate();LogcatHelper.getInstance(this).start();}@Overridepublic void onTerminate() {super.onTerminate();LogcatHelper.getInstance(this).stop();}@Overridepublic void onTrimMemory(int level) {super.onTrimMemory(level);}}