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https://developer.android.google.cn/reference/android/app/KeyguardManager KeyguardManager | API reference | Android Developers api reference android developers https://developer.android.google.cn/reference/android/app/KeyguardManager?authuser=2 KeyguardManager | API reference | Android Developers api reference android developers https://developer.android.com/reference/android/app/KeyguardManager?authuser=1 KeyguardManager | API reference | Android Developers api reference android developers https://developer.android.com/reference/android/app/KeyguardManager?authuser=4 KeyguardManager | API reference | Android Developers api reference android developers https://developer.android.com/reference/android/app/KeyguardManager?authuser=19 KeyguardManager | API reference | Android Developers api reference android developers https://developer.android.google.cn/reference/android/app/KeyguardManager?authuser=3 KeyguardManager | API reference | Android Developers api reference android developers