Android 4.2.2 取消锁屏界面

frameworks/base/policy/src/com/android/internal/policy/impl/keyguard/KeyguardViewMediator.java
    /**
     * External apps (like the phone app) can tell us to disable the keygaurd.
     */
    private boolean mExternallyEnabled = true;
改为false

$ source build/envsetup.sh
$ mmm frameworks/base/policy/

$ adb push android.policy.jar /system/framework/