监听Log 并写入文件

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public class NoteLog {//Log信息 保存路径private static final String FILE_PATH = "/sdcard/log/";private static final String LOG_PATH = FILE_PATH + "log.txt";private static final int LOG_FILE_MAX_SIZE = 50;//50 KBstatic Thread readLogthread;static BufferedReader reader = null;static Boolean isStop = false;static FileOutputStream out = null;public static void startNoteLog() {startNoteLogThread();}public static void stopNoteLog() {isStop = true;closeLogReader();if (readLogthread != null) {readLogthread.interrupt();}}private static void startNoteLogThread() {/** 开启线程用于监听log输出的信息 **/readLogthread = new Thread() {@Overridepublic void run() {try {readLogcatInfo();} catch (IOException e) {e.printStackTrace();} finally {closeLogReader();}}};readLogthread.start();}private static void readLogcatInfo() throws IOException {Process mLogcatProc = null;String line = "";// 清除LOGRuntime.getRuntime().exec("logcat -c");ArrayList<String> commandLine = new ArrayList<String>();commandLine.add("logcat");commandLine.add("-v");commandLine.add("time");commandLine.add("-s");commandLine.add("AndroidRuntime:e"); // *表示所有TAG(*:e)mLogcatProc = Runtime.getRuntime().exec(commandLine.toArray(new String[commandLine.size()]));reader = new BufferedReader(new InputStreamReader(mLogcatProc.getInputStream()));while (!isStop && (line = reader.readLine()) != null) {write(line);}}private static void write(String data) {try {File file = new File(FILE_PATH);if (!file.exists()) {file.mkdir();}File logFile = new File(LOG_PATH);if (logFile.exists()) {if (logFile.length() > 1024 * LOG_FILE_MAX_SIZE) {logFile.delete();}}out = new FileOutputStream(LOG_PATH, true);if (data != null && !data.contains("beginning")) {out.write(data.getBytes());}} catch (IOException e) {e.printStackTrace();} finally {if (out != null) {try {out.close();out = null;} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}private static void closeLogReader() {try {if (out != null) {out.close();out = null;}if (reader != null) {reader.close();reader = null;}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

在manifest.xml中增加权限

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

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