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  • 判断蓝牙是否连接

    Android对于蓝牙开发从2.0版本的sdk才开始支持,而且模拟器不支持,测试至少需要两部手机,所以制约了很多技术人员的开发。
    1. 首先,要操作蓝牙,先要在AndroidManifest.xml里加入权限
    // 管理蓝牙设备的权限
    <uses-permissionandroid:name="android.permission.BLUETOOTH_ADMIN" />
    // 使用蓝牙设备的权限
    <uses-permissionandroid:name="android.permission.BLUETOOTH" />
    2.打开蓝牙
    获得蓝牙适配器(android.bluetooth.BluetoothAdapter),检查该设备是否支持蓝牙,如果支持,就打开蓝牙。
    [java]
    // 检查设备是否支持蓝牙
    adapter = BluetoothAdapter.getDefaultAdapter();
    if (adapter == null)
    {
    // 设备不支持蓝牙
    }
    // 打开蓝牙
    if (!adapter.isEnabled())
    {
    Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    // 设置蓝牙可见性,最多300秒
    intent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
    context.startActivity(intent);
    }
    // 检查设备是否支持蓝牙
    adapter = BluetoothAdapter.getDefaultAdapter();
    if (adapter == null)
    {
    // 设备不支持蓝牙
    }
    // 打开蓝牙
    if (!adapter.isEnabled())
    {
    Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    // 设置蓝牙可见性,最多300秒
    intent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
    context.startActivity(intent);
    }
    3.获取已配对的蓝牙设备(android.bluetooth.BluetoothDevice)
    首次连接某蓝牙设备需要先配对,一旦配对成功,该设备的信息会被保存,以后连接时无需再配对,所以已配对的设备不一定是能连接的。
    [java]
    BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
    Set<BluetoothDevice> devices = adapter.getBondedDevices();
    for(int i=0; i<devices.size(); i++)
    {
    BluetoothDevice device = (BluetoothDevice) devices.iterator().next();
    System.out.println(device.getName());
    }
    BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
    Set<BluetoothDevice> devices = adapter.getBondedDevices();
    for(int i=0; i<devices.size(); i++)
    {
    BluetoothDevice device = (BluetoothDevice) devices.iterator().next();
    System.out.println(device.getName());
    }
    4.搜索周围的蓝牙设备
    适配器搜索蓝牙设备后将结果以广播形式传出去,所以需要自定义一个继承广播的类,在onReceive方法中获得并处理蓝牙设备的搜索结果。
    [java]
    // 设置广播信息过滤
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(BluetoothDevice.ACTION_FOUND);
    intentFilter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
    intentFilter.addAction(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
    intentFilter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
    // 注册广播接收器,接收并处理搜索结果
    context.registerReceiver(receiver, intentFilter);
    // 寻找蓝牙设备,android会将查找到的设备以广播形式发出去
    adapter.startDiscovery();
    // 设置广播信息过滤
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(BluetoothDevice.ACTION_FOUND);
    intentFilter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
    intentFilter.addAction(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
    intentFilter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
    // 注册广播接收器,接收并处理搜索结果
    context.registerReceiver(receiver, intentFilter);
    // 寻找蓝牙设备,android会将查找到的设备以广播形式发出去
    adapter.startDiscovery(); 自定义广播类
    [java]
    private BroadcastReceiver receiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();
    if (BluetoothDevice.ACTION_FOUND.equals(action)) {
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    System.out.println(device.getName());
    }
    }
    }
    private BroadcastReceiver receiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();
    if (BluetoothDevice.ACTION_FOUND.equals(action)) {
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    System.out.println(device.getName());
    }
    }
    }
    5.蓝牙设备的配对和状态监视
    [java]
    private BroadcastReceiver receiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();
    if (BluetoothDevice.ACTION_FOUND.equals(action)) {
    // 获取查找到的蓝牙设备
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    System.out.println(device.getName());
    // 如果查找到的设备符合要连接的设备,处理
    if (device.getName().equalsIgnoreCase(name)) {
    // 搜索蓝牙设备的过程占用资源比较多,一旦找到需要连接的设备后需要及时关闭搜索
    adapter.cancelDiscovery();
    // 获取蓝牙设备的连接状态
    connectState = device.getBondState();
    switch (connectState) {
    // 未配对
    case BluetoothDevice.BOND_NONE:
    // 配对
    try {
    Method createBondMethod = BluetoothDevice.class.getMethod("createBond");
    createBondMethod.invoke(device);
    } catch (Exception e) {
    e.printStackTrace();
    }
    break;
    // 已配对
    case BluetoothDevice.BOND_BONDED:
    try {
    // 连接
    connect(device);
    } catch (IOException e) {
    e.printStackTrace();
    }
    break;
    }
    }
    } else if(BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {
    // 状态改变的广播
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    if (device.getName().equalsIgnoreCase(name)) {
    connectState = device.getBondState();
    switch (connectState) {
    case BluetoothDevice.BOND_NONE:
    break;
    case BluetoothDevice.BOND_BONDING:
    break;
    case BluetoothDevice.BOND_BONDED:
    try {
    // 连接
    connect(device);
    } catch (IOException e) {
    e.printStackTrace();
    }
    break;
    }
    }
    }
    }
    }
    private BroadcastReceiver receiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();
    if (BluetoothDevice.ACTION_FOUND.equals(action)) {
    // 获取查找到的蓝牙设备
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    System.out.println(device.getName());
    // 如果查找到的设备符合要连接的设备,处理
    if (device.getName().equalsIgnoreCase(name)) {
    // 搜索蓝牙设备的过程占用资源比较多,一旦找到需要连接的设备后需要及时关闭搜索
    adapter.cancelDiscovery();
    // 获取蓝牙设备的连接状态
    connectState = device.getBondState();
    switch (connectState) {
    // 未配对
    case BluetoothDevice.BOND_NONE:
    // 配对
    try {
    Method createBondMethod = BluetoothDevice.class.getMethod("createBond");
    createBondMethod.invoke(device);
    } catch (Exception e) {
    e.printStackTrace();
    }
    break;
    // 已配对
    case BluetoothDevice.BOND_BONDED:
    try {
    // 连接
    connect(device);
    } catch (IOException e) {
    e.printStackTrace();
    }
    break;
    }
    }
    } else if(BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {
    // 状态改变的广播
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    if (device.getName().equalsIgnoreCase(name)) {
    connectState = device.getBondState();
    switch (connectState) {
    case BluetoothDevice.BOND_NONE:
    break;
    case BluetoothDevice.BOND_BONDING:
    break;
    case BluetoothDevice.BOND_BONDED:
    try {
    // 连接
    connect(device);
    } catch (IOException e) {
    e.printStackTrace();
    }
    break;
    }
    }
    }
    }
    } 6.蓝牙设备的连接
    [java]
    private void connect(BluetoothDevice device) throws IOException {
    // 固定的UUID
    final String SPP_UUID = "00001101-0000-1000-8000-00805F9B34FB";
    UUID uuid = UUID.fromString(SPP_UUID);
    BluetoothSocket socket = device.createRfcommSocketToServiceRecord(uuid);
    socket.connect();
    }
    private void connect(BluetoothDevice device) throws IOException {
    // 固定的UUID
    final String SPP_UUID = "00001101-0000-1000-8000-00805F9B34FB";
    UUID uuid = UUID.fromString(SPP_UUID);
    BluetoothSocket socket = device.createRfcommSocketToServiceRecord(uuid);
    socket.connect();
    }
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  • 原文地址:https://www.cnblogs.com/linximeng/p/3738504.html
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