/* * Copyright 2016 Google Inc. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.google.android.apps.forscience.ble; import android.annotation.TargetApi; import android.bluetooth.le.BluetoothLeScanner; import android.bluetooth.le.ScanCallback; import android.bluetooth.le.ScanFilter; import android.bluetooth.le.ScanRecord; import android.bluetooth.le.ScanResult; import android.bluetooth.le.ScanSettings; import android.content.Context; import android.os.ParcelUuid; import java.util.ArrayList; import java.util.List; /** Discovers LE devices using API level 21+ methods. */ @TargetApi(21) /* package */ class DeviceDiscovererV21 extends DeviceDiscoverer { private BluetoothLeScanner scanner; private final ScanCallback callback = new ScanCallback() { @Override public void onScanResult(int callbackType, ScanResult result) { manageScanResult(result); } @Override public void onBatchScanResults(List<ScanResult> results) { for (ScanResult result : results) { manageScanResult(result); } } @Override public void onScanFailed(int errorCode) { // TODO: surface errors. } private void manageScanResult(ScanResult result) { List<String> serviceUuids = new ArrayList<>(); ScanRecord record = result.getScanRecord(); if (record != null) { List<ParcelUuid> parcelUuids = record.getServiceUuids(); if (parcelUuids != null) { for (ParcelUuid uuid : parcelUuids) { serviceUuids.add(uuid.toString()); } } } addOrUpdateDevice(new NativeDevice(result.getDevice(), serviceUuids), result.getRssi()); } }; DeviceDiscovererV21(Context context) { super(context); } @Override public void onStartScanning(ParcelUuid[] serviceUuids) { scanner = getBluetoothAdapter().getBluetoothLeScanner(); List<ScanFilter> filters = new ArrayList<>(); for (ParcelUuid uuid : serviceUuids) { filters.add(new ScanFilter.Builder().setServiceUuid(uuid).build()); } ScanSettings settings = new ScanSettings.Builder().setScanMode(ScanSettings.SCAN_MODE_BALANCED).build(); scanner.startScan(filters, settings, callback); } @Override public void onStopScanning() { if (scanner != null) { if (isBluetoothEnabled()) { scanner.stopScan(callback); } } } }