Android logcat信息记录到手机文件的方法

这里介绍两种方法：目前使用 方法一

方法一：

添加权限：

示例代码：

    public class MyApp extends Application {  
      
        private Process mLogProcess;  
      
        @Override  
        public void onCreate() {  
            super.onCreate();  
            try {  
                int pid = android.os.Process.myPid();  
                Log.d("MyApp", "PID is " + pid);  
                Calendar calendar = Calendar.getInstance();  
                String filename = String.format("/sdcard/MyApp_Log_%04d%02d%02d_%02d%02d%02d.txt",  
                        calendar.get(Calendar.YEAR),  
                        calendar.get(Calendar.MONTH),  
                        calendar.get(Calendar.DAY_OF_MONTH),  
                        calendar.get(Calendar.HOUR_OF_DAY),  
                        calendar.get(Calendar.MINUTE),  
                        calendar.get(Calendar.SECOND));  
                mLogProcess = Runtime.getRuntime().exec(String.format("logcat -v time -f %s", filename));  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }  
      
        @Override  
        public void onTerminate() {  
            super.onTerminate();  
      
            if(mLogProcess != null ){  
                mLogProcess.destroy();  
            }  
        }  
    }  

方法二：

添加权限 同上;

示例代码：

    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 {// 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 + "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;  
                    }  
      
                }  
      
            }  
      
        }  
      
    }  

时间工具类：

    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，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：

    public class GPSApplication extends Application {  
      
        @Override  
        public void onCreate() {  
            // TODO Auto-generated method stub  
            LogcatHelper.getInstance(this).start();  
        }  
    }