[RK3288][Android6.0] 系统的ANR(Application Not Responding)
Platform: Rockchip
OS: Android 6.0
Kernel: 3.10.92
定义:
如果应用程序一段时间内不响应,系统会向用户显示一个对话框,这个对话框叫应用程序无响应.这种行为就叫ANR(Application Not Responding)
触发原因:
UI线程做耗时操作.例如不能处理到来的input event事件.
系统主要通过Activity Manager 和 Window Manager 两个service来监控,当有如下行为时,触发 ANR.
- 5秒内无法响应input event(如按键,屏幕触摸事件)
- BroadcastReceiver中处理超过10秒
ANR时间的定义在ActivityManagerService.java中
// How long we wait until we timeout on key dispatching.
static final int KEY_DISPATCHING_TIMEOUT = 5*1000;
broadcast分前台后后台两种.
// How long we allow a receiver to run before giving up on it.
static final int BROADCAST_FG_TIMEOUT = 10*1000;
static final int BROADCAST_BG_TIMEOUT = 60*1000;
避免ANR:
不要把耗时操作放在UI thread或者BroadcastReceiver中, 放在子线程或者service中去完成.