Android 5.0 BLE 周边(BluetoothLeAdvertiser)

来源：互联网发布：淘宝商城香奈儿包包编辑：程序博客网时间：2024/05/16 07:35

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)。

这里写图片描述

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);    }});

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