標籤:rate super package new OLE ble from string number
轉載請表明http://blog.csdn.net/lansefeiyang08/article/details/46468743
知道Android L對藍芽對了一些改進,包括添加A2dp sink、HFP client、BLE Peripheral功能等等。
我花了一天多時間對Android L BLE Peripheral SDK進行了研究,網上的資料很少,有一個介紹的還不夠清晰,所以就自己寫了一個測試應用,希望可以對理解BLE Peripheral有一定的協助。
此貼主要以講解代碼為主,我會把項目代碼也傳到CSDN中,協助大家測試。
首先說明一點,並不是Android L的系統就可以支援BLE Peripheral,這個和硬體也是有關係的(以前有人告訴我支援BLE Peripheral是純軟體的東西,要不就是扯淡,要不就是我測得有問題)。我用我手上的Pad(支援BLE central,android5.0)發現直接不支援,Android5.0 SDK已經開始支援check手機是否支援BLE Peripheral,後面代碼會提到。
好了,下面我就直接上代碼了。為了代碼簡單整潔,我用一個Activity來完成最基本的功能,如果還有其他需求,只要稍微改一下就可以了。
我在寫這個代碼的時候,第一個困惑是BLE Peripheral操作流程是什嗎?代碼流程怎麼寫?我相信大家和我應該是一樣的困惑。所以我不全部貼代碼(我上傳後,代碼直接下載好了)。我按照流程給大家說一下我寫的思路。
首先,我去查SDK的介面,我發現在android L SDK中多了一個package:android.bluetooth.le;裡面多了Peripheral和Scanner,Scanner我會後面更新。
第二步開始寫代碼,代碼裡首先檢查是否支援BLE、BLE Peripheral。代碼如下:
[java] view plain copy
- private void init(){
- if(!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)){
- Toast.makeText(this, R.string.ble_not_supported, Toast.LENGTH_LONG).show();
- finish();
- }
-
- final BluetoothManager mBluetoothManager = (BluetoothManager) getSystemService(BLUETOOTH_SERVICE);
- mBluetoothAdapter = mBluetoothManager.getAdapter();
-
- if(mBluetoothAdapter == null){
- Toast.makeText(this, R.string.bluetooth_not_supported, Toast.LENGTH_LONG).show();
- finish();
- }
-
- mBluetoothLeAdvertiser = mBluetoothAdapter.getBluetoothLeAdvertiser();
- if(mBluetoothLeAdvertiser == null){
- Toast.makeText(this, "the device not support peripheral", Toast.LENGTH_SHORT ).show();
- Log.e(TAG, "the device not support peripheral");
- finish();
- }
- }
前幾段代碼我就不說了,搞過BLE的基本都是通用的,但是你會發現在代碼裡多了一句
[java] view plain copy
- mBluetoothLeAdvertiser = mBluetoothAdapter.getBluetoothLeAdvertiser();
這一句代碼會直接判斷你的裝置到底支援不支援BLE Peripheral。假如此傳回值非空,你才可以繼續有機會開發,如果返回空,那說明你的裝置搞不了BLE Peripheral(當然,My Code裡沒有判斷是否開啟了藍芽,這個為了節省時間,你們自己可以添加上)。
支援不支援BLE Peripheral,你也可以用BluetoothAdapter類的isMultipleAdvertisementSupported()函數去check,實際上getBluetoothLeAdvetiser()也會執行上面的isMultipleAdvertisementSupported函數,所以我就直接一步到位了,但是原理大家要懂。
第三,你的裝置已經支援BLE Peripheral了,那麼下一步就是要考慮我怎麼發廣播了。但是你在發廣播之前,要先準備自己的資料,比如你自己是什麼service,裡面有什麼data等等。
我們先來看看發廣播的函數長得什麼樣子:
[java] view plain copy
- mBluetoothLeAdvertiser.startAdvertising(createAdvSettings(true, 0), createAdvertiseData(), mAdvertiseCallback);
從廣播函數應該可以看到所需要的參數,一個是廣播設定參數,一個是廣播資料,還有一個是Callback。當然startAdvertising有兩種格式,另外一種可以獲得廣播資料的response。
下面我們來看一下AdvertiseSettings:
[java] view plain copy
- /** create AdvertiseSettings */
- public static AdvertiseSettings createAdvSettings(boolean connectable, int timeoutMillis) {
- AdvertiseSettings.Builder mSettingsbuilder = new AdvertiseSettings.Builder();
- mSettingsbuilder.setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_BALANCED);
- mSettingsbuilder.setConnectable(connectable);
- mSettingsbuilder.setTimeout(timeoutMillis);
- mSettingsbuilder.setTxPowerLevel(AdvertiseSettings.ADVERTISE_TX_POWER_HIGH);
- AdvertiseSettings mAdvertiseSettings = mSettingsbuilder.build();
- if(mAdvertiseSettings == null){
- if(D){
- Toast.makeText(mContext, "mAdvertiseSettings == null", Toast.LENGTH_LONG).show();
- Log.e(TAG,"mAdvertiseSettings == null");
- }
- }
- return mAdvertiseSettings;
- }
這裡面一共有四個參數,AdvertiseMode、Connectable、Timeout、TxPowerLevel。當然我們可以設定我們需要的,其他的參數會使用預設的值。
再就是格式很重要,我們一定要是AdvertiseSettings.builder,不然你只能設定一個參數。
再就是AdvertiseData:
[java] view plain copy
- public static AdvertiseData createAdvertiseData(){
- AdvertiseData.Builder mDataBuilder = new AdvertiseData.Builder();
- mDataBuilder.addServiceUuid(ParcelUuid.fromString(HEART_RATE_SERVICE));
- AdvertiseData mAdvertiseData = mDataBuilder.build();
- if(mAdvertiseData==null){
- if(D){
- Toast.makeText(mContext, "mAdvertiseSettings == null", Toast.LENGTH_LONG).show();
- Log.e(TAG,"mAdvertiseSettings == null");
- }
- }
-
- return mAdvertiseData;
- }
這裡面就需要設定很多參數了,我這裡為了簡單,只廣播心跳的UUID,但是沒有資料。如果你們有自己的資料等等,可以再這裡面去設定,自訂函數也在AdvertiseData類裡。
最後一步就是準備Callback函數:
[java] view plain copy
- private AdvertiseCallback mAdvertiseCallback = new AdvertiseCallback() {
- @Override
- public void onStartSuccess(AdvertiseSettings settingsInEffect) {
- super.onStartSuccess(settingsInEffect);
- if (settingsInEffect != null) {
- Log.d(TAG, "onStartSuccess TxPowerLv=" + settingsInEffect.getTxPowerLevel() + " mode=" + settingsInEffect.getMode()
- + " timeout=" + settingsInEffect.getTimeout());
- } else {
- Log.e(TAG, "onStartSuccess, settingInEffect is null");
- }
- Log.e(TAG,"onStartSuccess settingsInEffect" + settingsInEffect);
-
- }
-
- @Override
- public void onStartFailure(int errorCode) {
- super.onStartFailure(errorCode);
- if(D) Log.e(TAG,"onStartFailure errorCode" + errorCode);
-
- if(errorCode == ADVERTISE_FAILED_DATA_TOO_LARGE){
- if(D){
- Toast.makeText(mContext, R.string.advertise_failed_data_too_large, Toast.LENGTH_LONG).show();
- Log.e(TAG,"Failed to start advertising as the advertise data to be broadcasted is larger than 31 bytes.");
- }
- }else if(errorCode == ADVERTISE_FAILED_TOO_MANY_ADVERTISERS){
- if(D){
- Toast.makeText(mContext, R.string.advertise_failed_too_many_advertises, Toast.LENGTH_LONG).show();
- Log.e(TAG,"Failed to start advertising because no advertising instance is available.");
- }
- }else if(errorCode == ADVERTISE_FAILED_ALREADY_STARTED){
- if(D){
- Toast.makeText(mContext, R.string.advertise_failed_already_started, Toast.LENGTH_LONG).show();
- Log.e(TAG,"Failed to start advertising as the advertising is already started");
- }
- }else if(errorCode == ADVERTISE_FAILED_INTERNAL_ERROR){
- if(D){
- Toast.makeText(mContext, R.string.advertise_failed_internal_error, Toast.LENGTH_LONG).show();
- Log.e(TAG,"Operation failed due to an internal error");
- }
- }else if(errorCode == ADVERTISE_FAILED_FEATURE_UNSUPPORTED){
- if(D){
- Toast.makeText(mContext, R.string.advertise_failed_feature_unsupported, Toast.LENGTH_LONG).show();
- Log.e(TAG,"This feature is not supported on this platform");
- }
- }
- }
- };
當你廣播成功,會受到onStartSuccess的回調,回調的參數也是AdvertiseSettings設定的參數。如果你還有你自己想做的,可以再這裡面去做。
為了大家方便,我把errorcode可能遇到的問題,都做了判斷,只有這五種錯誤情況。
最後一步就是關閉了,開了廣播要關閉,不然會造成未知問題:
[java] view plain copy
- private void stopAdvertise() {
- if (mBluetoothLeAdvertiser != null) {
- mBluetoothLeAdvertiser.stopAdvertising(mAdvertiseCallback);
- mBluetoothLeAdvertiser = null;
- }
- }
ok,代碼就是這麼簡單,只要熟悉流程就可以搞定。希望對大家有協助。
代碼路徑為:http://download.csdn.net/detail/lansefeiyang08/8799027
android5.0(Lollipop) BLE Peripheral牛刀小試