How to on-off the bluetooth progamatically in android:-

Here, we will use the class "BluetoothAdapter" , which allow us to all bluetooth interaction and perform its tasks.

Firstly , we have to set permission in manifest to access device bluetooth.

 <uses-permission android:name="android.permission.BLUETOOTH"/>
 <uses-permission android:name="android.permission.BLUETOOTH&#95;ADMIN"/>

Now we have to check whether bluetooth is on or off.

 BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
 boolean isBluetoothOn = bluetoothAdapter.isEnabled();

A the end you can on or off the bluetooth as per your requirement.

if (!isBluetoothOn) {
        bluetoothAdapter.enable(); 
    }
    else if(isBluetoothOn) {
        bluetoothAdapter.disable();
    }