139 lines
4.9 KiB
Java
139 lines
4.9 KiB
Java
/*
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* Copyright 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.snippet.bluetooth;
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import static android.bluetooth.BluetoothDevice.TRANSPORT_LE;
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import static java.util.concurrent.TimeUnit.SECONDS;
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import android.bluetooth.BluetoothAdapter;
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import android.bluetooth.BluetoothDevice;
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import android.bluetooth.BluetoothGatt;
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import android.bluetooth.BluetoothGattCallback;
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import android.bluetooth.BluetoothManager;
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import android.bluetooth.BluetoothProfile;
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import android.bluetooth.le.ScanCallback;
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import android.bluetooth.le.ScanResult;
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import android.bluetooth.le.ScanSettings;
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import android.content.Context;
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import android.os.ParcelUuid;
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import android.util.Log;
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import java.util.UUID;
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import java.util.concurrent.CountDownLatch;
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public final class BluetoothGattMultiDevicesClient {
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private static final String TAG = "BluetoothGattMultiDevicesClient";
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private Context mContext;
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private BluetoothAdapter mBluetoothAdapter;
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private BluetoothGatt mBluetoothGatt;
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private CountDownLatch mConnectionBlocker = null;
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private CountDownLatch mServicesDiscovered = null;
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private static final int CALLBACK_TIMEOUT_SEC = 60;
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private BluetoothDevice mServer;
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private final BluetoothGattCallback mGattCallback =
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new BluetoothGattCallback() {
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@Override
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public void onConnectionStateChange(
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BluetoothGatt device, int status, int newState) {
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Log.i(TAG, "onConnectionStateChange: newState=" + newState);
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if (newState == BluetoothProfile.STATE_CONNECTED
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&& mConnectionBlocker != null) {
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Log.v(TAG, "Connected");
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mConnectionBlocker.countDown();
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}
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}
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@Override
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public void onServicesDiscovered(BluetoothGatt gatt, int status) {
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mServicesDiscovered.countDown();
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}
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};
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public BluetoothGattMultiDevicesClient(Context context, BluetoothManager manager) {
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mContext = context;
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mBluetoothAdapter = manager.getAdapter();
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}
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public boolean connect(String uuid) {
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// Scan for the peer
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var serverFoundBlocker = new CountDownLatch(1);
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var scanner = mBluetoothAdapter.getBluetoothLeScanner();
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var callback =
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new ScanCallback() {
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@Override
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public void onScanResult(int callbackType, ScanResult result) {
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var uuids = result.getScanRecord().getServiceUuids();
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Log.v(TAG, "Found uuids " + uuids);
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if (uuids != null
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&& uuids.contains(new ParcelUuid(UUID.fromString(uuid)))) {
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mServer = result.getDevice();
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serverFoundBlocker.countDown();
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}
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}
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};
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scanner.startScan(null, new ScanSettings.Builder().setLegacy(false).build(), callback);
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boolean timeout = false;
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try {
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timeout = !serverFoundBlocker.await(CALLBACK_TIMEOUT_SEC, SECONDS);
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} catch (InterruptedException e) {
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Log.e(TAG, "", e);
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timeout = true;
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}
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scanner.stopScan(callback);
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if (timeout) {
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Log.e(TAG, "Did not discover server");
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return false;
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}
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// Connect to the peer
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mConnectionBlocker = new CountDownLatch(1);
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mBluetoothGatt = mServer.connectGatt(mContext, false, mGattCallback, TRANSPORT_LE);
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timeout = false;
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try {
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timeout = !mConnectionBlocker.await(CALLBACK_TIMEOUT_SEC, SECONDS);
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} catch (InterruptedException e) {
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Log.e(TAG, "", e);
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timeout = true;
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}
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if (timeout) {
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Log.e(TAG, "Did not connect to server");
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return false;
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}
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return true;
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}
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public boolean containsService(String uuid) {
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mServicesDiscovered = new CountDownLatch(1);
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mBluetoothGatt.discoverServices();
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try {
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mServicesDiscovered.await(CALLBACK_TIMEOUT_SEC, SECONDS);
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} catch (InterruptedException e) {
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Log.e(TAG, "", e);
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return false;
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}
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return mBluetoothGatt.getService(UUID.fromString(uuid)) != null;
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}
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}
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