Android 5.0 BLE 周边(BluetoothLeAdvertiser)

转自 http://blog.csdn.net/songzeyang99/article/details/41727023

      具有低功耗蓝牙模块的设备可以扮演2个角色，中心，周边。周边是数据提供者，中心是数据接收/处理者。IOS设备可以很好的扮演这2个角色，利用现成的API就能开发出具有周边和中心功能的应用，我大Android就有点悲催了，自Android 4.3的系统就规定了BLE的API，但是仅限于中心，至于周边一直没有API的支持。直到2014.6.26 Android Lollipop的面世，才带来了周边API的支持(BluetoothLeAdvertiser)。

      利用空闲时间看了看文档写了个一段关于BLE 周边的代码，当我兴冲冲的运行在Nexus5上面时，瞬间就crash了空指针异常，看了下源代码

/** * Returns a {@link BluetoothLeAdvertiser} object for Bluetooth LE Advertising operations, or null if Bluetooth LE Advertising is not support on this device. * <p> * Use {@link #isMultipleAdvertisementSupported()} to check whether LE Advertising is supported on this device before calling this method. */ public BluetoothLeAdvertiser getBluetoothLeAdvertiser() { if (getState() != STATE_ON) { return null; } if (!isMultipleAdvertisementSupported()) { return null; } synchronized(mLock) { if (sBluetoothLeAdvertiser == null) { sBluetoothLeAdvertiser = new BluetoothLeAdvertiser(mManagerService); } } return sBluetoothLeAdvertiser; }

使用方式

final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); BluetoothAdapter mBluetoothAdapter = bluetoothManager.getAdapter(); BluetoothLeAdvertiser advertiser = mBluetoothAdapter.getBluetoothLeAdvertiser(); AdvertiseData data = new AdvertiseData.Builder().addServiceUuid(ParcelUuid.fromString(ADVERTISER_SERVICE_UUID)).build(); AdvertiseSettings settings = new AdvertiseSettings.Builder().setConnectable(true).build(); advertiser.startAdvertising(settings , data, new AdvertiseCallback() { @Override public void onStartSuccess(AdvertiseSettings settingsInEffect) { super.onStartSuccess(settingsInEffect); } });