恢复出厂设置流程：
packages/apps/Settings/src/com/android/settings/MasterClearConfirm.java： 发送 Intent.ACTION_MASTER_CLEAR 广播
frameworks/base/core/java/android/os/RecoverySystem.java 调用 rebootWipeUserData
再到 frameworks/base/services/core/java/com/android/server/RecoverySystemService.java rebootRecoveryWithCommand setupOrClearBcb SystemProperties.set("ctl.start", "setup-bcb");
再启动 bootable/recovery/uncrypt/uncrypt.cpp setup_bcb
最后是frameworks/base/services/core/java/com/android/server/RecoverySystemService.java pm.reboot(PowerManager.REBOOT_RECOVERY);
注意广播： frameworks/base/core/res/AndroidManifest.xml receiver android:name="com.android.server.MasterClearReceiver" action android:name="android.intent.action.MASTER_CLEAR"