<Switch
android:id="@+id/open"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textOff="藍牙關閉中"
android:textOn="藍牙開啟中" />

open.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
    mBluetoothAdapter.enable();//打開藍牙
} else {
    mBluetoothAdapter.disable();// 關閉藍牙
}
}
});