ANR原因：
● 5s内无法响应用户输入事件(例如键盘输入, 触摸屏幕等).
● BroadcastReceiver在10s内无法结束.
● 获取不到CPU时间片（CPU太满了）；
● 主线程等待未及时出现的event，不能执行下一步；
● 处理流程过于复杂。
ANR类型：
Key Dispach Timeout
Input event
ALPS_ICS_MP 15s
ALPS_ICS_MP 8s
Android默认5s；
Broadcast Timeout
BroadcastReceiver 未能在10s处理完
Android默认10s；
ServiceTimeout 请求服务失败20s内
主线程处理消息队列中的消息时阻塞并且没有及时处理之后的消息，超过一定时间，就发生了anr。
案例分析：
等待同步锁：
"main" prio=5 tid=1 Blocked
| group="main" sCount=1 dsCount=0 obj=0x75098e48 self=0xf4fb6500
| sysTid=3394 nice=0 cgrp=default sched=0/0 handle=0xf7235b34
| state=S schedstat=( 0 0 0 ) utm=168 stm=73 core=3 HZ=100
| stack=0xff3ed000-0xff3ef000 stackSize=8MB
| held mutexes=
at com.meizu.media.gallery.data.ai.b_(SourceFile:1476)
- waiting to lock <0x054dd944> (a com.meizu.media.gallery.data.ai) held by thread 36 //再去分析这个线程，我就不贴了
at com.meizu.media.gallery.fragment.AlbumGridFragment$c$1.a(SourceFile:1536)
at com.meizu.media.gallery.data.aw.f(SourceFile:197)
- locked <0x08f06a2d> (a java.util.WeakHashMap)
等待进程通信事务Wait Binder transaction：
"main" prio=5 tid=1 Native
| group="main" sCount=1 dsCount=0 obj=0x752b53a8 self=0x7f8447c400
| sysTid=32144 nice=-6 cgrp=default sched=0/0 handle=0x7f882fd2c0
| state=S schedstat=( 867701473 1907646540 1027 ) utm=51 stm=35 core=5 HZ=100
| stack=0x7fdabb7000-0x7fdabb9000 stackSize=8MB
| held mutexes=
kernel: (couldn't read /proc/self/task/32144/stack)
at android.os.BinderProxy.transactNative(Native method)
at android.os.BinderProxy.transact(Binder.java:514)
在UI线程（主线程）等待网络数据:
""main"" prio=5 tid=3 NATIVE
|group=""main"" sCount=1 dsCount=0 s=Yobj=0x4001b240 self=0xbda8
| sysTid=2579 nice=0 sched=0/0cgrp=unknown handle=-1343993184
atorg.apache.harmony.luni.platform.OSNetworkSystem.receiveStreamImpl(NativeMethod) //非本应用代码，是调用第三方http请求的代码
atorg.apache.harmony.luni.platform.OSNetworkSystem.receiveStream(OSNetworkSystem.java:478)
atorg.apache.harmony.luni.net.PlainSocketImpl.read(PlainSocketImpl.java:565)
CPU gc:
Process:com.anly.githubapp
...
CPU usage from 3330ms to 814ms ago:
6% 178/system_server: 3.5% user + 1.4% kernel / faults: 86 minor 20 major
4.6% 2976/com.anly.githubapp: 0.7% user + 3.7% kernel /faults: 52 minor 19 major
0.9% 252/com.android.systemui: 0.9% user + 0% kernel
...
100%TOTAL: 5.9% user + 4.1% kernel + 89% iowait
最后一句表明了:
1. 当是CPU占用100%, 满负荷了.
2. 其中绝大数是被iowait即I/O操作占用了.
内存GC： 多个GC字眼，Heap free都为0
Heap: 0% free, 256MB/256MB; 1899604 objects
Total time spent in GC: 12.607s
Mean GC size throughput: 3MB/s
Mean GC object throughput: 25535.1 objects/s
Total number of allocations 2221526
Total bytes allocated 297MB
Total bytes freed 40MB
Free memory 0B
Free memory until GC 0B
Free memory until OOME 3GB
Total memory 256MB
Max memory 256MB
Zygote space size 1440KB
Total mutator paused time: 1.310s
Total time waiting for GC to complete: 32.254s
Total GC count: 55
Total GC time: 12.607s
Total blocking GC count: 50
Total blocking GC time: 11.202s
Histogram of GC count per 10000 ms: 0:14,1:1,3:1,4:1
Histogram of blocking GC count per 10000 ms: 0:16,3:1