Android ADB原理(1)---ADB enable/disable

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当用户选择“Settings”->"Applictions"->"devleopment"->"USB Debugging"时

1. call: Settings.Secure.putInt(getContentResolver(), Settings.Secure.ADB_ENABLED, 1) in packages/apps/Settings/src/com/android/settings/DevelopmentSettings.java

2. frameworks/base/services/java/com/android/server/SystemServer.java中有一个AdbSettingsObserver：

mContentResolver.registerContentObserver(Settings.Secure.getUriFor(Settings.Secure.ADB_ENABLED),

false, new AdbSettingsObserver());

当ADB_ENABLED变化后，将接收到通知，然后会设置persist.service.adb.enable为1或者0.

在init.rc中：

# adbd is controlled by the persist.service.adb.enable system property
service adbd /sbin/adbd
# disabled

on property:persist.service.adb.enable=1
start adbd

on property:persist.service.adb.enable=0
stop adbd

因此当persist.service.adb.enable变化时，adbd将会被启动或者停止。

adbd源代码在system/core/adb下面