接收一个系统广播花了500ms的解决办法！

接收一个系统广播花了500ms. 改成系统应用。

08-14 16:36:43.404 D/lfy ( 1386): [PhoneWindowManager] interceptKeyBeforeQueueing...发送android.intent.action.down...

08-14 16:36:43.404 W/ContextImpl( 1386): Calling a method in the system process without a qualified user: android.app.ContextImpl.sendBroadcast:1220 com.android.server.policy.PhoneWindowManager.interceptKeyBeforeQueueing:4389 com.android.server.wm.InputManagerCallback.interceptKeyBeforeQueueing:149 com.android.server.input.InputManagerService.interceptKeyBeforeQueueing:2476 <bottom of call stack>

08-14 16:36:43.406 E/ActivityManager( 1386): Sending non-protected broadcast android.intent.action.SCAN_KEY.down from system 1386:system/1000 pkg android

08-14 16:36:43.406 E/ActivityManager( 1386): java.lang.Throwable

08-14 16:36:43.406 E/ActivityManager( 1386): at com.android.server.am.ActivityManagerService.checkBroadcastFromSystem(ActivityManagerService.java:14498)

08-14 16:36:43.406 E/ActivityManager( 1386): at com.android.server.am.ActivityManagerService.broadcastIntentLockedTraced(ActivityManagerService.java:15323)

08-14 16:36:43.406 E/ActivityManager( 1386): at com.android.server.am.ActivityManagerService.broadcastIntentLocked(ActivityManagerService.java:14562)

08-14 16:36:43.406 E/ActivityManager( 1386): at com.android.server.am.ActivityManagerService.broadcastIntentWithFeature(ActivityManagerService.java:15540)

08-14 16:36:43.406 E/ActivityManager( 1386): at android.app.ContextImpl.sendBroadcast(ContextImpl.java:1224)

08-14 16:36:43.406 E/ActivityManager( 1386): at com.android.server.policy.PhoneWindowManager.interceptKeyBeforeQueueing(PhoneWindowManager.java:4389)

08-14 16:36:43.406 E/ActivityManager( 1386): at com.android.server.wm.InputManagerCallback.interceptKeyBeforeQueueing(InputManagerCallback.java:149)

08-14 16:36:43.406 E/ActivityManager( 1386): at com.android.server.input.InputManagerService.interceptKeyBeforeQueueing(InputManagerService.java:2476)

08-14 16:36:43.410 E/lfy ( 1386): [PhoneWindowManager] getSpecialTestKeyItentActionForTestMode...keyCode = 754

08-14 16:36:43.599 D/WindowManager( 1386): interceptKeyTq keycode=754 interactive=true keyguardActive=false policyFlags=22000000 down =false canceled = false isWakeKey=false result = 1 useHapticFeedback = false isInjected = false

08-14 16:36:43.600 D/lfy ( 1386): [PhoneWindowManager] interceptKeyBeforeQueueing...发送android.intent.action.up...

08-14 16:36:43.600 W/ContextImpl( 1386): Calling a method in the system process without a qualified user: android.app.ContextImpl.sendBroadcast:1220 com.android.server.policy.PhoneWindowManager.interceptKeyBeforeQueueing:4389 com.android.server.wm.InputManagerCallback.interceptKeyBeforeQueueing:149 com.android.server.input.InputManagerService.interceptKeyBeforeQueueing:2476 <bottom of call stack>

08-14 16:36:43.602 E/ActivityManager( 1386): Sending non-protected broadcast android.intent.action.up from system 1386:system/1000 pkg android

08-14 16:36:43.602 E/ActivityManager( 1386): java.lang.Throwable

08-14 16:36:43.602 E/ActivityManager( 1386): at com.android.server.am.ActivityManagerService.checkBroadcastFromSystem(ActivityManagerService.java:14498)

08-14 16:36:43.602 E/ActivityManager( 1386): at com.android.server.am.ActivityManagerService.broadcastIntentLockedTraced(ActivityManagerService.java:15323)

08-14 16:36:43.602 E/ActivityManager( 1386): at com.android.server.am.ActivityManagerService.broadcastIntentLocked(ActivityManagerService.java:14562)

08-14 16:36:43.602 E/ActivityManager( 1386): at com.android.server.am.ActivityManagerService.broadcastIntentWithFeature(ActivityManagerService.java:15540)

08-14 16:36:43.602 E/ActivityManager( 1386): at android.app.ContextImpl.sendBroadcast(ContextImpl.java:1224)

08-14 16:36:43.602 E/ActivityManager( 1386): at com.android.server.policy.PhoneWindowManager.interceptKeyBeforeQueueing(PhoneWindowManager.java:4389)

08-14 16:36:43.602 E/ActivityManager( 1386): at com.android.server.wm.InputManagerCallback.interceptKeyBeforeQueueing(InputManagerCallback.java:149)

08-14 16:36:43.602 E/ActivityManager( 1386): at com.android.server.input.InputManagerService.interceptKeyBeforeQueueing(InputManagerService.java:2476)

08-14 16:36:43.606 E/lfy ( 1386): [PhoneWindowManager] getSpecialTestKeyItentActionForTestMode...keyCode = 754

08-14 16:36:43.915 D/( 5128): onReceive: android.intent.action.down

08-14 16:36:43.915 D/( 5128): onReceive: 11111111

为什么变成系统应用后延迟就少了？

一旦你是系统应用（或特权应用）：

• AMS 会绕过某些限制逻辑（如 checkBroadcastFromSystem()、isBackgroundRestricted()）
• 广播投递走的是高优通道
• 如果广播是从系统进程直接发出来的（如你贴的 key 事件广播），对系统应用的处理是立即同步分发