Logcat tool

【 Reference documents 】
Google Doc

1. Format specification
（1） Log time ：03-10 10:13:14.234
（2）PID（ process ID）：21007
（3）TID（ Threads ID）：18000
（4） priority ：E
（5） Convenience label ：AndroidRuntime
（6） Body log ：FATAL EXCEPTION: URGENT_THREAD_540

2. priority
（1） V—Verbose
The lowest level , Some details in the development of debugging , Use only in development , Contains methods such as method names , Information such as variable values .
（2）D—Debug
Information for debugging , More common , In development, you often choose to output logs of this level .
（3）I—Info
Information , This level log shows the running status information , It can help when there is a problem with the product , Logs starting at this level usually contain complete English sentences and debugging information , Is the most common logging level
（4） W—Warning
Warning , There is an exception in the operation, an error is about to occur, or it indicates that a non fatal error has occurred , Logs at this level usually show exceptions during execution , For example try-catch After the exception in the statement block prints the stack trace, this level of log can be output .
（5）E—Error
An error affecting the operation has occurred , For example, applications crash Log output when .