根據Android 7.0的兼容性文檔(https://source.android.com/compatibility/7.0/android-7.0-cdd.pdf)

里面7.3.4 Bluetooth部分描述：

Android Watch implementations MUST support Bluetooth. Android Television implementations

MUST support Bluetooth and Bluetooth LE. Android Automotive implementations MUST

support Bluetooth and SHOULD support Bluetooth LE.

Device implementations that support android.hardware.vr.high_performance feature MUST support

Bluetooth 4.2 and Bluetooth LE Data Length Extension.

Android includes support for Bluetooth and Bluetooth Low Energy . Device implementations that

include support for Bluetooth and Bluetooth Low Energy MUST declare the relevant platform features

(android.hardware.bluetooth and android.hardware.bluetooth_le respectively) and implement the

platform APIs. Device implementations SHOULD implement relevant Bluetooth profiles such as A2DP,

AVCP, OBEX, etc. as appropriate for the device.

可見官方文檔在Android 7.0才要求支持藍牙4.2

總結

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