Joseph Pirozzo | e5ac56c | 2018-01-10 15:05:57 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2018 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.car; |
| 18 | |
| 19 | import android.bluetooth.BluetoothAdapter; |
| 20 | import android.bluetooth.BluetoothManager; |
| 21 | |
| 22 | import android.bluetooth.le.AdvertiseCallback; |
| 23 | import android.bluetooth.le.AdvertiseData; |
| 24 | import android.bluetooth.le.AdvertiseSettings; |
| 25 | import android.bluetooth.le.BluetoothLeAdvertiser; |
| 26 | import android.content.Context; |
| 27 | import android.content.res.Resources; |
| 28 | import android.os.ParcelUuid; |
| 29 | import android.util.Log; |
| 30 | |
| 31 | import java.nio.ByteBuffer; |
| 32 | import java.nio.ByteOrder; |
| 33 | import java.util.Arrays; |
| 34 | |
| 35 | /** |
| 36 | * An advertiser for the Bluetooth LE based Fast Pair service. |
| 37 | * FastPairProvider enables easy Bluetooth pairing between a peripheral and a phone participating in |
| 38 | * the Fast Pair Seeker role. When the seeker finds a compatible peripheral a notification prompts |
| 39 | * the user to begin pairing if desired. A peripheral should call startAdvertising when it is |
| 40 | * appropriate to pair, and stopAdvertising when pairing is complete or it is no longer appropriate |
| 41 | * to pair. |
| 42 | */ |
| 43 | class FastPairProvider { |
| 44 | |
| 45 | private static final String TAG = "FastPairProvider"; |
| 46 | private static final boolean DBG = Utils.DBG; |
| 47 | |
| 48 | // Service ID assigned for FastPair. |
| 49 | private static final ParcelUuid FastPairServiceUuid = ParcelUuid |
| 50 | .fromString("0000FE2C-0000-1000-8000-00805f9b34fb"); |
| 51 | |
| 52 | private AdvertiseSettings mSettings; |
| 53 | private AdvertiseData mData; |
| 54 | private BluetoothLeAdvertiser mBluetoothLeAdvertiser; |
| 55 | private AdvertiseCallback mAdvertiseCallback; |
| 56 | |
| 57 | |
| 58 | FastPairProvider(Context context) { |
| 59 | Resources res = context.getResources(); |
| 60 | int modelId = res.getInteger(R.integer.fastPairModelId); |
| 61 | if (modelId == 0) { |
| 62 | Log.w(TAG, "Model ID undefined, disabling"); |
| 63 | return; |
| 64 | } |
| 65 | |
| 66 | BluetoothManager bluetoothManager = (BluetoothManager) context.getSystemService( |
| 67 | Context.BLUETOOTH_SERVICE); |
| 68 | if (bluetoothManager != null) { |
| 69 | BluetoothAdapter bluetoothAdapter = bluetoothManager.getAdapter(); |
| 70 | if (bluetoothAdapter != null) { |
| 71 | mBluetoothLeAdvertiser = bluetoothAdapter.getBluetoothLeAdvertiser(); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | AdvertiseSettings.Builder settingsBuilder = new AdvertiseSettings.Builder(); |
| 76 | settingsBuilder.setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_LOW_LATENCY); |
| 77 | settingsBuilder.setTxPowerLevel(AdvertiseSettings.ADVERTISE_TX_POWER_HIGH); |
| 78 | settingsBuilder.setConnectable(true); |
| 79 | settingsBuilder.setTimeout(0); |
| 80 | mSettings = settingsBuilder.build(); |
| 81 | |
| 82 | AdvertiseData.Builder dataBuilder = new AdvertiseData.Builder(); |
| 83 | ByteBuffer modelIdBytes = ByteBuffer.allocate(4).order(ByteOrder.LITTLE_ENDIAN).putInt( |
| 84 | modelId); |
| 85 | byte[] fastPairServiceData = Arrays.copyOfRange(modelIdBytes.array(), 0, 3); |
| 86 | dataBuilder.addServiceData(FastPairServiceUuid, fastPairServiceData); |
| 87 | dataBuilder.setIncludeTxPowerLevel(true).build(); |
| 88 | mData = dataBuilder.build(); |
| 89 | |
| 90 | mAdvertiseCallback = new FastPairAdvertiseCallback(); |
| 91 | } |
| 92 | |
| 93 | /* register the BLE advertisement using the model id provided during construction */ |
| 94 | boolean startAdvertising() { |
| 95 | if (mBluetoothLeAdvertiser != null) { |
| 96 | mBluetoothLeAdvertiser.startAdvertising(mSettings, mData, mAdvertiseCallback); |
| 97 | return true; |
| 98 | } |
| 99 | return false; |
| 100 | } |
| 101 | |
| 102 | /* unregister the BLE advertisement. */ |
| 103 | boolean stopAdvertising() { |
| 104 | if (mBluetoothLeAdvertiser != null) { |
| 105 | mBluetoothLeAdvertiser.stopAdvertising(mAdvertiseCallback); |
| 106 | return true; |
| 107 | } |
| 108 | return false; |
| 109 | } |
| 110 | |
| 111 | /* Callback to handle status when advertising starts. */ |
| 112 | private class FastPairAdvertiseCallback extends AdvertiseCallback { |
| 113 | @Override |
| 114 | public void onStartFailure(int errorCode) { |
| 115 | super.onStartFailure(errorCode); |
| 116 | if (DBG) Log.d(TAG, "Advertising failed"); |
| 117 | } |
| 118 | |
| 119 | @Override |
| 120 | public void onStartSuccess(AdvertiseSettings settingsInEffect) { |
| 121 | super.onStartSuccess(settingsInEffect); |
| 122 | if (DBG) Log.d(TAG, "Advertising successfully started"); |
| 123 | } |
| 124 | } |
| 125 | } |