When I am using this code getDefaultAdapter couldn't supported and showing toast also wrong.

CodePudding user response：

You can refer to this answer. You can try something like

BluetoothAdapter.getDefaultAdapter()

CodePudding user response：

getDefaultAdapter() will work, but they are recommending you migrate to use BluetoothManager and getAdapter().

In an Activity:

val bluetoothManager = getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
m_bluetoothAdapter = bluetoothManager.adapter

In a Fragment:

val bluetoothManager = requireContext().getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
m_bluetoothAdapter = bluetoothManager.adapter

There is no toast() function. It apparently was provided by the core-ktx Jetpack library at one time and later removed. Use the standard way of showing Toasts.