android4.4系统永不锁屏

android4.4\frameworks\base\packages\Keyguard\src\com\android\keyguard\KeyguardViewMediator.java

    /**
     * External apps (like the phone app) can tell us to disable the keygaurd.
     */
    private boolean mExternallyEnabled = false;//系统此属性默认是true，本类把所有的mExternallyEnabled  此属性改成false，系统永远就不锁屏了

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