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四、BluetoothGattCallback回调函数（安卓蓝牙ble教程）
becase__:
它总是连不上蓝牙，log里是这样的
E/BluetoothAdapter: LE Scan has already started
D/BluetoothGatt: onClientConnectionState() - status=133 clientIf=9 device=1C:EE:9A:E5:78:32
D/BluetoothGatt: discoverServices() - device: 13:97:13:53:4E:7C
D/onConnectionStateChange: 连接断开
D/BluetoothGatt: onClientConnectionState() - status=133 clientIf=10 device=1C:EE:9A:E5:78:32
D/BluetoothGatt: discoverServices() - device: 13:97:13:53:4E:7C
D/onConnectionStateChange: 连接断开
D/BluetoothGatt: onClientConnectionState() - status=133 clientIf=11 device=13:97:13:53:4E:7C
D/BluetoothGatt: discoverServices() - device: 13:97:13:53:4E:7C
D/onConnectionStateChange: 连接断开
D/BluetoothAdapter: startLeScan(): null
E/BluetoothAdapter: LE Scan has already started
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