本文主要是介绍Android BLE开发： BLE Peripheral开发流程，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
Android从lolipop开始支持了BLE Peripheral开发。网上也有关于Framework的文章。真的关于应用开发的确不多，google官网也只给出了一个Central的Demo。之前做了一个BLE Peripheral的Demo，这里将Peripheral开发的一些流程简单整理一下。不多说，直接上代码。
初始化
//初始化BluetoothManager和BluetoothAdapter
if(mBluetoothManager == null)mBluetoothManager = (BluetoothManager) mActivity.getSystemService(Context.BLUETOOTH_SERVICE);if (mBluetoothManager != null && mBluetoothAdapter == null) {mBluetoothAdapter = mBluetoothManager.getAdapter();
}//打开蓝牙的套路
if ((mBluetoothAdapter == null) || (!mBluetoothAdapter.isEnabled())) {Toast.makeText(mActivity, R.string.bt_unavailable, Toast.LENGTH_SHORT).show();Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);mActivity.startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}开始广播
//获取BluetoothLeAdvertiser，BLE发送BLE广播用的一个API
if (mBluetoothAdvertiser == null) {mBluetoothAdvertiser = mBluetoothAdapter.getBluetoothLeAdvertiser();
}
//创建BluetoothGattServerCallback，
//MockServerCallBack这个类继承自BluetoothGattServerCallback
//后面会贴出MockServerCallBack这个类的代码
//BluetoothGattServerCallback这个回调类主要是一些BLE读写的接口
//关于BLE读写的操作都在这个Callback中完成
if (mBluetoothAdvertiser != null) {mMockServerCallBack = new MockServerCallBack(mActivity);//打开BluetoothGattServermGattServer = mBluetoothManager.openGattServer(mActivity, mMockServerCallBack);if(mGattServer == null){Log.d(TAG , "gatt is null");}try{mMockServerCallBack.setupServices(mGattServer);//创建BLE Adevertising并且广播mBluetoothAdvertiser.startAdvertising(createAdvSettings(true, 0), createFMPAdvertiseData(),mAdvCallback);}catch(InterruptedException e){Log.v(TAG, "Fail to setup BleService");}
}创建Advertising
public static AdvertiseSettings createAdvSettings(boolean connectable, int timeoutMillis) {AdvertiseSettings.Builder builder = new AdvertiseSettings.Builder();//设置广播的模式,应该是跟功耗相关builder.setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_BALANCED);builder.setConnectable(connectable);builder.setTimeout(timeoutMillis);builder.setTxPowerLevel(AdvertiseSettings.ADVERTISE_TX_POWER_HIGH);return builder.build();
}//设置一下FMP广播数据
public static AdvertiseData createFMPAdvertiseData() {AdvertiseData.Builder builder = new AdvertiseData.Builder();builder.setIncludeDeviceName(true);AdvertiseData adv = builder.build();return adv;
}//发送广播的回调，onStartSuccess/onStartFailure很明显的两个Callback
private AdvertiseCallback mAdvCallback = new AdvertiseCallback() {public void onStartSuccess(android.bluetooth.le.AdvertiseSettings settingsInEffect) {if (settingsInEffect != null) {Log.d(TAG, "onStartSuccess TxPowerLv="+ settingsInEffect.getTxPowerLevel()+ " mode=" + settingsInEffect.getMode()+ " timeout=" + settingsInEffect.getTimeout());} else {Log.d(TAG, "onStartSuccess, settingInEffect is null");}}public void onStartFailure(int errorCode) {Log.d(TAG, "onStartFailure errorCode=" + errorCode);};
};BLE需要的BluetoothGattServerCallback
import android.app.Activity;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattDescriptor;
import android.bluetooth.BluetoothGattServer;
import android.bluetooth.BluetoothGattServerCallback;
import android.bluetooth.BluetoothGattService;
import android.util.Log;public class MockServerCallBack extends BluetoothGattServerCallback {private static final String TAG = "BleServer";private byte[] mAlertLevel = new byte[] {(byte) 0x00};private Activity mActivity;private HomePager mHomepager;private boolean mIsPushStatic = false;private BluetoothGattServer mGattServer;private BluetoothGattCharacteristic mDateChar;private BluetoothDevice btClient;private BluetoothGattCharacteristic mHeartRateChar;private BluetoothGattCharacteristic mTemperatureChar;private BluetoothGattCharacteristic mBatteryChar;private BluetoothGattCharacteristic mManufacturerNameChar;private BluetoothGattCharacteristic mModuleNumberChar;private BluetoothGattCharacteristic mSerialNumberChar;public void setupServices(BluetoothGattServer gattServer) throws InterruptedException{if (gattServer == null) {throw new IllegalArgumentException("gattServer is null");}mGattServer = gattServer;// 设置一个GattService以及BluetoothGattCharacteristic { //immediate alertBluetoothGattService ias = new BluetoothGattService( UUID.fromString(IMXUuid.SERVICE_IMMEDIATE_ALERT),BluetoothGattService.SERVICE_TYPE_PRIMARY);//alert level char.BluetoothGattCharacteristic alc = new BluetoothGattCharacteristic(UUID.fromString(IMXUuid.CHAR_ALERT_LEVEL),BluetoothGattCharacteristic.PROPERTY_READ |BluetoothGattCharacteristic.PROPERTY_WRITE | BluetoothGattCharacteristic.PROPERTY_NOTIFY ,BluetoothGattCharacteristic.PERMISSION_READ |BluetoothGattCharacteristic.PERMISSION_WRITE);alc.setValue("");ias.addCharacteristic(alc);if(mGattServer!=null && ias!=null)mGattServer.addService(ias);}}//当添加一个GattService成功后会回调改接口。public void onServiceAdded(int status, BluetoothGattService service) {if (status == BluetoothGatt.GATT_SUCCESS) {Log.d(TAG, "onServiceAdded status=GATT_SUCCESS service=" + service.getUuid().toString());} else {Log.d(TAG, "onServiceAdded status!=GATT_SUCCESS");}}//BLE连接状态改变后回调的接口public void onConnectionStateChange(android.bluetooth.BluetoothDevice device, int status,int newState) {Log.d(TAG, "onConnectionStateChange status=" + status + "->" + newState);}//当有客户端来读数据时回调的接口public void onCharacteristicReadRequest(android.bluetooth.BluetoothDevice device,int requestId, int offset, BluetoothGattCharacteristic characteristic) {Log.d(TAG, "onCharacteristicReadRequest requestId=" + requestId + " offset=" + offset);mGattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset,characteristic.getValue());}//当有客户端来写数据时回调的接口@Overridepublic void onCharacteristicWriteRequest(android.bluetooth.BluetoothDevice device,int requestId, BluetoothGattCharacteristic characteristic, boolean preparedWrite,boolean responseNeeded, int offset, byte[] value) {mGattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset, null);}//当有客户端来写Descriptor时回调的接口@Overridepublic void onDescriptorWriteRequest (BluetoothDevice device, int requestId, BluetoothGattDescriptor descriptor, boolean preparedWrite, boolean responseNeeded, int offset, byte[] value) {btClient = device;Log.d(TAG, "onDescriptorWriteRequest");// now tell the connected device that this was all successfullmGattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset, value);}
}至此，BLE Peripheral发送广播所需要的工作都完成了，并且当有Central设备读写该Peripheral设备时候也能通过BluetoothGattServerCallback回调到。
停止广播
//关闭BluetoothLeAdvertiser，BluetoothAdapter，BluetoothGattServer
if (mBluetoothAdvertiser != null) {mBluetoothAdvertiser.stopAdvertising(mAdvCallback);mBluetoothAdvertiser = null;
}if(mBluetoothAdapter != null){mBluetoothAdapter = null;
}if (mGattServer != null) {mGattServer.clearServices();mGattServer.close();
} 这样，Android设备就停止了BLE的广播，外部的Central设备就搜索不到该设备并且连接上它了。
BLE Peripheral的API乍一看有些多，其实仔细理一理非常简单，工作重点在于那个Callback的编写。
这篇关于Android BLE开发： BLE Peripheral开发流程的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
