Android-BLE低功耗蓝牙开发
16lz
2021-12-04
Android蓝牙开发
1.初始化
mBLEService = new BluetoothLeService(this); //区别于android的四大组件服务,相当于工具类BLECommunicateUtils.setBLEService(mBLEService);mBLEService.setOnServiceDiscoverListener(mOnServiceDiscover);mBLEService.setOnDataAvailableListener(mOnDataAvailable);mBLEService.setOnDisconnectListener(mOnDisconnectListener);mBLEService.setOnConnectListener(mOnConnectListener);2.扫描获取设备
/** * @param enable (扫描使能，true:扫描开始,false:扫描停止) * @return void * @throws * @Title: scanLeDevice * @Description: TODO(扫描蓝牙设备) */private void scanLeDevice(final boolean enable) { if (enable) { // Stops scanning after a pre-defined scan period. mHandler.postDelayed(new Runnable() { @Override public void run() { mScanning = false; mBluetoothAdapter.stopLeScan(mLeScanCallback); if (mBLEService != null) { mBLEService.close(); } Log.e(TAG, "扫描时间结束,停止扫描"); } }, SCAN_PERIOD); /* 开始扫描蓝牙设备，带mLeScanCallback 回调函数 */ mScanning = true; mBluetoothAdapter.startLeScan(mLeScanCallback); Log.e(TAG, "开始扫描"); } else { mScanning = false; mBluetoothAdapter.stopLeScan(mLeScanCallback); Log.e(TAG, "停止扫描"); }}3.扫描蓝牙的回调
/** * 蓝牙扫描回调函数 实现扫描蓝牙设备，回调蓝牙BluetoothDevice，可以获取name MAC等信息 **/private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, final int rssi, byte[] scanRecord) { if (device.getName() != null && device.getName().equals(BLUETOOTH_NAME)) { Log.e(TAG, "扫描得到我的设备"); if (mScanning) { mBluetoothAdapter.stopLeScan(mLeScanCallback); mScanning = false; } mBLEService.connect(device); } }};4.连接蓝牙的回调BluetoothGattCallback
/** * connect a remoteDevice callback */private BluetoothGattCallback mGattCallBack = new BluetoothGattCallback() { //建立连接 @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { super.onConnectionStateChange(gatt, status, newState); if (newState == BluetoothProfile.STATE_CONNECTED) { mBluetoothGatt.discoverServices(); if (mOnConnectListener != null) { mOnConnectListener.onConnect(mBluetoothGatt); } } else if (newState == BluetoothProfile.STATE_DISCONNECTED) { // 2016/4/25 if disconnect ,trigger mOnDisconnectListener if (mOnDisconnectListener != null) { mOnDisconnectListener.onDisconnect(mBluetoothGatt); } } } //发现服务 @Override public void onServicesDiscovered(BluetoothGatt gatt, int status) { super.onServicesDiscovered(gatt, status); if (status == BluetoothGatt.GATT_SUCCESS && mOnServiceDiscoverListener != null) { mOnServiceDiscoverListener.onServiceDiscover(gatt); } } @Override public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { super.onCharacteristicRead(gatt, characteristic, status); if (status==BluetoothGatt.GATT_SUCCESS && mOnDataAvailableListener != null) { mOnDataAvailableListener.onCharacteristicRead(gatt, characteristic); } } @Override public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { super.onCharacteristicWrite(gatt, characteristic, status); if (mOnDataAvailableListener != null) { mOnDataAvailableListener.onCharacteristicWrite(gatt, characteristic); } } @Override public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) { super.onCharacteristicChanged(gatt, characteristic); if (mOnDataAvailableListener != null) { mOnDataAvailableListener.onCharacteristicWrite(gatt, characteristic); mOnDataAvailableListener.onCharacteristicRead(gatt,characteristic); } } /* * 读描述值 * */ @Override public void onDescriptorRead(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) { super.onDescriptorRead(gatt, descriptor, status); } /* * 写描述值 * */ @Override public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) { super.onDescriptorWrite(gatt, descriptor, status); } @Override public void onReliableWriteCompleted(BluetoothGatt gatt, int status) { super.onReliableWriteCompleted(gatt, status); } @Override public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) { super.onReadRemoteRssi(gatt, rssi, status); } @Override public void onMtuChanged(BluetoothGatt gatt, int mtu, int status) { super.onMtuChanged(gatt, mtu, status); }};5.在onServicesDiscovered的回调中发送指令
/** * get the supported characteristics , maybe need to change * * @param gattServices gattServices */private void displayGattServices(List<BluetoothGattService> gattServices) { if (gattServices == null) { return; } for (BluetoothGattService gattService : gattServices) { List<BluetoothGattCharacteristic> gattCharacteristics = gattService.getCharacteristics(); for (final BluetoothGattCharacteristic gattCharacteristic : gattCharacteristics) { if (gattCharacteristic.getUuid().toString().equals(HEART_RATE_MEASUREMENT)) { // 接受Characteristic被写的通知,收到蓝牙模块的数据后会触发mOnDataAvailable.onCharacteristicWrite() mBLEService.setCharacteristicNotification( gattCharacteristic, true); } gattCharacteristic_charA = gattCharacteristic; } } BLECommunicateUtils.sendData(gattCharacteristic_charA, StringUtils. hexStringToBytes("***************指令代码*****************"));}5.接收蓝牙设备返回的数据
需要设置
// 接受Characteristic被写的通知,收到蓝牙模块的数据后会触发mOnDataAvailable.onCharacteristicWrite()mBLEService.setCharacteristicNotification( gattCharacteristic, true);在连接蓝牙 的onCharacteristicChanged回调中处理接收的数据
@Overridepublic void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) { Log.e(TAG, "收到了数据" + characteristic.toString()); //断开连接 if (mBLEService != null) { mBLEService.close(); } Log.e(TAG, "断开连接");}6.注意事项:
- 关闭蓝牙
/** * close the BluetoothGatt */ public void close() { if (mBluetoothGatt == null) { return; } mBluetoothGatt.close();// mBluetoothGatt = null; 要设置不要置为null因为安卓mBluetoothGatt有一个限制,连接几次后发现连不上的情况. }7.Demo参考:
http://download.csdn.net/detail/github_34224676/9793523
Github传送门:
https://github.com/IOXusu/Android-BLE-Demo
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