如何使用android作为ble广播器？

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

if (!bluetoothAdapter.isEnabled()) {
    Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}

BluetoothGattService service = new BluetoothGattService(UUID_SERVICE, BluetoothGattService.SERVICE_TYPE_PRIMARY);
BluetoothGattCharacteristic characteristic = new BluetoothGattCharacteristic(UUID_CHARACTERISTIC, BluetoothGattCharacteristic.PROPERTY_READ, BluetoothGattCharacteristic.PERMISSION_READ);
characteristic.setValue("Hello, BLE!");
service.addCharacteristic(characteristic);

BluetoothLeAdvertiser advertiser = bluetoothAdapter.getBluetoothLeAdvertiser();
AdvertiseSettings settings = new AdvertiseSettings.Builder()
        .setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_LOW_LATENCY)
        .setConnectable(false)
        .setTimeout(0)
        .setTxPowerLevel(AdvertiseSettings.ADVERTISE_TX_POWER_HIGH)
        .build();
AdvertiseData data = new AdvertiseData.Builder()
        .setIncludeDeviceName(true)
        .addServiceUuid(new ParcelUuid(UUID_SERVICE))
        .build();
advertiser.startAdvertising(settings, data, advertiseCallback);

advertiser.stopAdvertising(advertiseCallback);