Android system log file

Question

Does Android OS system events trigger a log file? If so, where / how can I read this?

Background: After I left my SEMC X10 Mini Pro last night, I wake up to find that it is turned off. I would like to look in the log file to try to figure out when and why the phone disconnected.

Answer 1

Found this old post , it may be interesting to you.

Answer 2

Use this class: this will log to a file on sd

public class Logger { public static final String APP_ID = "Android APP"; public static String logDir = "/androidapp"; public static String logFileName = "/log.txt"; public static boolean writeLogsToFile = false; public static final int LOG_LEVEL_VERBOSE = 4; public static final int LOG_LEVEL_DEBUG = 3; public static final int LOG_LEVEL_INFO = 2; public static final int LOG_LEVEL_ERROR = 1; public static final int LOG_LEVEL_OFF = 0; public static final int CURRENT_LOG_LEVEL = LOG_LEVEL_DEBUG; public static void log(String message, int logLevel) { if (logLevel > CURRENT_LOG_LEVEL) { return; } else { Log.v(APP_ID, message); if (writeLogsToFile) { writeToFile(message); } } } private static void writeToFile(String message) { try { File sdCard = Environment.getExternalStorageDirectory(); File dir = new File(sdCard.getAbsolutePath() + logDir); dir.mkdirs(); File file = new File(dir, logFileName); PrintWriter writer = new PrintWriter(new BufferedWriter(new FileWriter(file, true), 8 * 1024)); writer.println(APP_ID + " " + new Date().toString() + " : " + message); writer.flush(); writer.close(); } catch (Exception e) { e.printStackTrace(); } } public static void verbose(String message) { log(message, LOG_LEVEL_VERBOSE); } public static void debug(String message) { log(message, LOG_LEVEL_DEBUG); } public static void error(String message) { log(message, LOG_LEVEL_ERROR); } public static void info(String message) { log(message, LOG_LEVEL_INFO); } }