android log保存文件,android logcat日志保存到文件中

package com.android.write;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileOutputStream;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.util.ArrayList;

import java.util.List;

public class SaveLog extends Thread {

private String shell = "logcat";

private String logpath = "/mnt/sdcard2/logcat.txt";

private BufferedReader mReader;

private Process process = null;

private FileOutputStream fos = null;

private InputStream inputStream= null;

private boolean mRunning = true;

private BufferedWriter bw = null;

private File file = null;

public SaveLog() {

file = new File(logpath);

try {

if (!file.exists()) {

file.createNewFile();

}

fos = new FileOutputStream(file, true);

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

public void run() {

try {

process = Runtime.getRuntime().exec(shell);

inputStream = process.getInputStream();

mReader = new BufferedReader(new InputStreamReader(inputStream));

String line = null;

while ((line = mReader.readLine()) != null){

file = new File(logpath);

if (!file.exists()) {

file.createNewFile();

fos = new FileOutputStream(file, true);

}

if (file.length() > 1 * 1024 * 1024) {

FileOutputStream fos = new FileOutputStream(file);

fos.write("".getBytes());

fos.close();

clearLogCache();

}

if (line.length() == 0) {

continue;

}

if (fos != null) {

fos.write((line + "n").getBytes());

}

}

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

private void clearLogCache() {

Process proc = null;

List commandList = new ArrayList();

commandList.add("logcat");

commandList.add("-c");

//commandList.add("*:E");// 过滤所有的错误信息

try {

proc = Runtime.getRuntime().exec(

commandList.toArray(new String[commandList.size()]));

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}