藍牙低功耗 (BLE) 技術會在大部分時間保持睡眠模式，以節省電力。這項服務只會在播放廣告和建立短暫連線時喚醒，因此廣告會影響耗電量和資料傳輸頻寬。
藍牙 5 廣告擴充功能
Android 8.0 支援藍牙 5，可改善廣播功能，並為 BLE 提供靈活的資料廣告。藍牙 5 支援 BLE 實體層 (PHY)，可保留藍牙 4.2 的低耗電量特性，讓使用者選擇增加頻寬或範圍。詳情請參閱 Bluetooth 5 核心規格。
實作
搭載 Android 8.0 且支援相容藍牙控制器的裝置，會自動提供新的藍牙 5 功能。請使用下列
BluetoothAdapter 方法，檢查裝置是否支援藍牙 5 功能：
isLe2MPhySupported()isLeCodedPhySupported()isLeExtendedAdvertisingSupported()isLePeriodicAdvertisingSupported()
如要停用廣告功能，請與藍牙晶片供應商合作，停用晶片組支援功能。
藍牙 PHY 彼此獨立，且每個 PHY 的行為皆由 Bluetooth SIG 預先定義。根據預設，Android 8.0 會使用藍牙 4.2 的藍牙 LE 1M PHY。
android.bluetooth.le 套件會透過下列 API 公開藍牙 5 廣告功能：
AdvertisingSetAdvertisingSetCallbackAdvertisingSetParametersPeriodicAdvertisingParameters
建立
AdvertisingSet 來修改藍牙廣告設定，方法是使用
android.bluetooth.le.BluetoothLeAdvertiser 中的 startAdvertisingSet() 方法。即使停用藍牙 5 或廣告功能的支援功能，API 功能也能套用至 LE 1M PHY。
範例
這個範例應用程式使用 Bluetooth LE 1M PHY 進行廣告：
// Start legacy advertising. Works for devices with 5.x controllers, // and devices that support multi-advertising. void example1() { BluetoothLeAdvertiser advertiser = BluetoothAdapter.getDefaultAdapter().getBluetoothLeAdvertiser(); AdvertisingSetParameters parameters = (new AdvertisingSetParameters.Builder()) .setLegacyMode(true) // True by default, but set here as a reminder. .setConnectable(true) .setInterval(AdvertisingSetParameters.INTERVAL_HIGH) .setTxPowerLevel(AdvertisingSetParameters.TX_POWER_MEDIUM) .build(); AdvertiseData data = (new AdvertiseData.Builder()).setIncludeDeviceName(true).build(); AdvertisingSetCallback callback = new AdvertisingSetCallback() { @Override public void onAdvertisingSetStarted(AdvertisingSet advertisingSet, int txPower, int status) { Log.i(LOG_TAG, "onAdvertisingSetStarted(): txPower:" + txPower + " , status: " + status); currentAdvertisingSet = advertisingSet; } @Override public void onAdvertisingDataSet(AdvertisingSet advertisingSet, int status) { Log.i(LOG_TAG, "onAdvertisingDataSet() :status:" + status); } @Override public void onScanResponseDataSet(AdvertisingSet advertisingSet, int status) { Log.i(LOG_TAG, "onScanResponseDataSet(): status:" + status); } @Override public void onAdvertisingSetStopped(AdvertisingSet advertisingSet) { Log.i(LOG_TAG, "onAdvertisingSetStopped():"); } }; advertiser.startAdvertisingSet(parameters, data, null, null, null, callback); // After onAdvertisingSetStarted callback is called, you can modify the // advertising data and scan response data: currentAdvertisingSet.setAdvertisingData(new AdvertiseData.Builder(). setIncludeDeviceName(true).setIncludeTxPowerLevel(true).build()); // Wait for onAdvertisingDataSet callback... currentAdvertisingSet.setScanResponseData(new AdvertiseData.Builder().addServiceUuid(new ParcelUuid(UUID.randomUUID())).build()); // Wait for onScanResponseDataSet callback... // When done with the advertising: advertiser.stopAdvertisingSet(callback); }
這個範例應用程式會使用 BLE 2M PHY 進行廣告放送。應用程式會先檢查裝置是否支援所使用的功能。如果支援廣告功能，應用程式會將 BLE 2M PHY 設為主要 PHY。當 2M PHY 處於啟用狀態時，廣告不支援藍牙 4.x 控制器，因此 setLegacyMode 會設為 false。這個範例會在廣告放送期間修改參數，並暫停廣告。
void example2() { BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter(); BluetoothLeAdvertiser advertiser = BluetoothAdapter.getDefaultAdapter().getBluetoothLeAdvertiser(); // Check if all features are supported if (!adapter.isLe2MPhySupported()) { Log.e(LOG_TAG, "2M PHY not supported!"); return; } if (!adapter.isLeExtendedAdvertisingSupported()) { Log.e(LOG_TAG, "LE Extended Advertising not supported!"); return; } int maxDataLength = adapter.getLeMaximumAdvertisingDataLength(); AdvertisingSetParameters.Builder parameters = (new AdvertisingSetParameters.Builder()) .setLegacyMode(false) .setInterval(AdvertisingSetParameters.INTERVAL_HIGH) .setTxPowerLevel(AdvertisingSetParameters.TX_POWER_MEDIUM) .setPrimaryPhy(BluetoothDevice.PHY_LE_1M) .setSecondaryPhy(BluetoothDevice.PHY_LE_2M); AdvertiseData data = (new AdvertiseData.Builder()).addServiceData(new ParcelUuid(UUID.randomUUID()), "You should be able to fit large amounts of data up to maxDataLength. This goes up to 1650 bytes. For legacy advertising this would not work".getBytes()).build(); AdvertisingSetCallback callback = new AdvertisingSetCallback() { @Override public void onAdvertisingSetStarted(AdvertisingSet advertisingSet, int txPower, int status) { Log.i(LOG_TAG, "onAdvertisingSetStarted(): txPower:" + txPower + " , status: " + status); currentAdvertisingSet = advertisingSet; } @Override public void onAdvertisingSetStopped(AdvertisingSet advertisingSet) { Log.i(LOG_TAG, "onAdvertisingSetStopped():"); } }; advertiser.startAdvertisingSet(parameters.build(), data, null, null, null, callback); // After the set starts, you can modify the data and parameters of currentAdvertisingSet. currentAdvertisingSet.setAdvertisingData((new AdvertiseData.Builder()).addServiceData(new ParcelUuid(UUID.randomUUID()), "Without disabling the advertiser first, you can set the data, if new data is less than 251 bytes long.".getBytes()).build()); // Wait for onAdvertisingDataSet callback... // Can also stop and restart the advertising currentAdvertisingSet.enableAdvertising(false, 0, 0); // Wait for onAdvertisingEnabled callback... currentAdvertisingSet.enableAdvertising(true, 0, 0); // Wait for onAdvertisingEnabled callback... // Or modify the parameters - i.e. lower the tx power currentAdvertisingSet.enableAdvertising(false, 0, 0); // Wait for onAdvertisingEnabled callback... currentAdvertisingSet.setAdvertisingParameters(parameters.setTxPowerLevel (AdvertisingSetParameters.TX_POWER_LOW).build()); // Wait for onAdvertisingParametersUpdated callback... currentAdvertisingSet.enableAdvertising(true, 0, 0); // Wait for onAdvertisingEnabled callback... // When done with the advertising: advertiser.stopAdvertisingSet(callback); }
驗證
執行適用的 藍牙產品測試，驗證裝置與藍牙 5 的相容性。