Log日志的信息分为5种：V,D,I,W,E
V是啰嗦的意思,Log.v(tag, message);
D是调试信息,Log.d(tag, message);
I是info,Log.i(tag, message);
W是警告,Log.w(tag, message);
E是error错误的意思,Log.e(tag, message);
V,D是调试的时候用的，
发布后只能用I，W，E这三种信息
当出现ANR/focus close错误的时候，是真机的话会在/data/log文件夹下面会有log日志
拿到一个日志文件，要分成多段来看 。 log文件很长，其中包含十几个小单元信息，但不要被吓到 ，事实上他主要由三大块儿组成 。
1，系统基本信息 ，包括 内存，CPU ，进程队列 ，虚拟内存 ， 垃圾回收等信息 。------ MEMORY INFO (/proc/meminfo) ------
------ CPU INFO (top -n 1 -d 1 -m 30 -t) ------
------ PROCRANK (procrank) ------
------ VIRTUAL MEMORY STATS (/proc/vmstat) ------
------ VMALLOC INFO (/proc/vmallocinfo) ------
格式如下：
------ MEMORY INFO (/proc/meminfo) ------
MemTotal: 347076 kB
MemFree: 56408 kB
Buffers: 7192 kB
Cached: 104064 kB
SwapCached: 0 kB
Active: 192592 kB
Inactive: 40548 kB
Active(anon): 129040 kB
Inactive(anon): 1104 kB
Active(file): 63552 kB
Inactive(file): 39444 kB
Unevictable: 7112 kB
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 44 kB
Writeback: 0 kB
AnonPages: 129028 kB
Mapped: 73728 kB
Shmem: 1148 kB
Slab: 13072 kB
SReclaimable: 4564 kB
SUnreclaim: 8508 kB
KernelStack: 3472 kB
PageTables: 12172 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 173536 kB
Committed_AS: 7394524 kB
VmallocTotal: 319488 kB
VmallocUsed: 90752 kB
VmallocChunk: 181252 kB
2，时间信息 ， 也是我们主要分析的信息 。
------ VMALLOC INFO (/proc/vmallocinfo) ------
------ EVENT INFO (/proc/vmallocinfo) ------
格式如下：
------ SYSTEM LOG (logcat -b system -v time -d *:v) ------
01-15 16:41:43.671 W/PackageManager( 2466): Unknown permission com.wsomacp.permission.PROVIDER in package com.Android.mms
01-15 16:41:43.671 I/ActivityManager( 2466): Force stopping package com.android.mms uid=10092
01-15 16:41:43.675 I/UsageStats( 2466): Something wrong here, didn't expect com.sec.android.app.twlauncher to be paused
01-15 16:41:44.108 I/ActivityManager( 2466): Start proc com.sec.android.widgetapp.infoalarm for service com.sec.android.widgetapp.infoalarm/.engine.DataService: pid=20634 uid=10005 gids={3003, 1015, 3002}
01-15 16:41:44.175 W/ActivityManager( 2466): Activity pause timeout for HistoryRecord{48589868 com.sec.android.app.twlauncher/.Launcher}
01-15 16:41:50.864 I/KeyInputQueue( 2466): Input event
01-15 16:41:50.866 D/KeyInputQueue( 2466): screenCaptureKeyFlag setting 0
01-15 16:41:50.882 I/PowerManagerService( 2466): Ulight 0->7|0
01-15 16:41:50.882 I/PowerManagerService( 2466): Setting target 2: cur=0.0 target=70 delta=4.6666665 nominalCurrentValue=0
01-15 16:41:50.882 I/PowerManagerService( 2466): Scheduling light animator!
01-15 16:41:51.706 D/PowerManagerService( 2466): enableLightSensor true
01-15 16:41:51.929 I/KeyInputQueue( 2466): Input event
01-15 16:41:51.933 W/WindowManager( 2466): No focus window, dropping: KeyEvent{action=0 code=26 repeat=0 meta=0 scancode=26 mFlags=9}