Anr no response introduction

1.1 summary

If the application does not respond or end execution within a period of time ,Android The system will trigger a “ The application is not responding ”(ANR) Dialog box . Generally speaking , This will happen in the application UI Occurs when a thread cannot process an input event on time because it is performing some work . In particular , Triggered when one of the following conditions is detected ANR Dialog box ：
■ The application did not respond to keyboard input or touch screen input for 5 More than seconds .
■ BroadcastReceiver Not in 10 Execution ends within seconds （ The background broadcast is 60 second ）.
■ Service or ContentProvider The start operation of is not in 20 Execution ends within seconds （ The background service is 200 second ）.
Sometimes ,ANR The dialog box is not displayed after the condition is triggered . This situation is usually caused by internal framework problems , For example, in an application ANR At the same time , There is a deadlock in the active manager or window manager . This situation will eventually lead to Android Watchdog timeout .

1.1.1 Logcat ANR news

When... Is triggered in the application ANR when , It will send a stop signal (SIGABRT) To end the unresponsive application . meanwhile ,logcat The corresponding messages will appear in the main buffer and system buffer of the .

In the main logcat in ,ANR A simple fatal termination signal for the application is displayed , As shown below ：
Fatal signal 6 (SIGABRT) at 0x000002e5 (code=0), thread 29715 (com.android.settings)
More detailed ANR Messages can be found in the system logcat View in . It contains important information about unresponsive applications , This should include
Application name 、ANR reason 、CPU Load information and IO Waiting for information .

06-13 15:45:38.923 E/ActivityManager( 654):ANR in com.android.settings 
(android/com.andro