android 保存文件到本地可见_android 日记log保存到本地简单方法

安卓日常开发中，经常需要打印日记，经常需要把log输入到本地查看，本demo是把日记输出到本地的简单示例：

1.初始化保存路径(实例中为SD卡下： /storage/emulated/0/interprenter)

/**

* 初始化目录

*/

private 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 + "interprenter";

} 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 + "interprenter";

}

File file = new File(PATH_LOGCAT);

if (!file.exists()) {

file.mkdirs();

LogUtils.e("创建文件夹");

}

LogUtils.e(PATH_LOGCAT);

}

2.编写一个线程，用户收集和写入日记

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, "log_"

+ 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;

}

@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((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;

}

}

}

}

3.对线程控制，已便达到控制日记的收集情况

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;

}

}

4.使用初始化，最好在application中使用

LogcatHelper.getInstance(this).start();

5.不要忘记添加读写权限

6.启动设备，运行一段时间后，shell命令进入到文件保存路径下查看log文件

命令：adb shell

cd /storage/emulated/0/interprenter

ls

7.adb命令pull出文件到本地

命令：exit 推出shell模式

adb pull /storage/emulated/0/interprenter/log_2018-11-26.log D:\interprenter

便可导出文件

8.完整代码

`package com.cniaomu.interprenter.util;

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;

import java.text.SimpleDateFormat;

import java.util.Date;

/**

修改日期 修改人 任务名称 功能或Bug描述

2018/8/16 20:46 MUZI102

*/

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

*/

private 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 + "interprenter";

} 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 + "interprenter";

}

File file = new File(PATH_LOGCAT);

if (!file.exists()) {

file.mkdirs();

LogUtils.e("创建文件夹");

}

LogUtils.e(PATH_LOGCAT);

}

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, "log_"

+ 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;

}

@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((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;

}

}

}

}

public 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 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

// }

}

`