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https://developer.android.google.cn/reference/android/hardware/serial/SerialManager?authuser=1 SerialManager | API reference | Android Developers api reference android developers https://developer.android.com/reference/kotlin/android/hardware/serial/SerialManager SerialManager | API reference | Android Developers api reference android developers https://developer.android.google.cn/reference/android/hardware/serial/SerialManager?authuser=0 SerialManager | API reference | Android Developers api reference android developers