Android saves log to SD card for debugging

Http://www.cnblogs.com/super119/archive/2011/08/31/2160942.html

Find a method to save the log, so that you can see the log if the mobile phone is not connected to the USB cable, and a simple experiment is feasible.

1. Connect to USB
2. Run the ADB shell command to log on to the mobile phone.
3. logcat-V Time-F/sdcard/locker. log *: W &

Then you can unplug the USB cable for normal testing. After a problem occurs, connect to the USB to capture the log. It is best to write down the approximate time of the problem so that you can find it later.