android 保存logcat信息到本地文件中

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package com.baidu.uitls;/** * Created by liuguodong on 2017/8/17. */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;/** * 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 + "DATASHOWJI";        } 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 + "DATASHOWJI";        }        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, "Setp-"                        + 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((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;                }            }        }    }}

开始：

LogcatHelper.getInstance(this).start();

停止：

LogcatHelper.getInstance(this).stop();

权限：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.READ_LOGS" />

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