android 蓝牙设备监听广播

蓝牙权限 <uses-permission android:name="android.permission.BLUETOOTH" />

1、监听手机本身蓝牙状态的广播

手机蓝牙开启关闭时发送

action: BluetoothAdapter.ACTION_STATE_CHANGED

if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
    int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,
            BluetoothAdapter.ERROR);
    switch (state) {
        case BluetoothAdapter.STATE_OFF:
            Log.d("aaa", "STATE_OFF 手机蓝牙关闭");
            break;
        case BluetoothAdapter.STATE_TURNING_OFF:
            Log.d("aaa", "STATE_TURNING_OFF 手机蓝牙正在关闭");
            break;
        case BluetoothAdapter.STATE_ON:
            Log.d("aaa", "STATE_ON 手机蓝牙开启");
            break;
        case BluetoothAdapter.STATE_TURNING_ON:
            Log.d("aaa", "STATE_TURNING_ON 手机蓝牙正在开启");
            break;
    }
}

2、监听蓝牙设备配对状态的广播

蓝牙设备配对和解除配对时发送

action: BluetoothDevice.ACTION_BOND_STATE_CHANGED

if (action.equals(BluetoothDevice.ACTION_BOND_STATE_CHANGED)) {
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    String name = device.getName();
    Log.d("aaa", "device name: " + name);
    int state = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, -1);
    switch (state) {
        case BluetoothDevice.BOND_NONE:
            Log.d("aaa", "BOND_NONE 删除配对");
            break;
        case BluetoothDevice.BOND_BONDING:
            Log.d("aaa", "BOND_BONDING 正在配对");
            break;
        case BluetoothDevice.BOND_BONDED:
            Log.d("aaa", "BOND_BONDED 配对成功");
            break;
    }
} 

3、监听蓝牙设备连接和连接断开的广播

蓝牙设备连接上和断开连接时发送, 这两个监听的是底层的连接状态

action: BluetoothDevice.ACTION_ACL_CONNECTED   BluetoothDevice.ACTION_ACL_DISCONNECTED

if (action.equals(BluetoothDevice.ACTION_ACL_CONNECTED)) {
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    Log.d("aaa", device.getName() + " ACTION_ACL_CONNECTED");
} else if (action.equals(BluetoothDevice.ACTION_ACL_DISCONNECTED)) {
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    Log.d("aaa", device.getName() + " ACTION_ACL_DISCONNECTED");
}

BluetoothClass 可以获取蓝牙设备的类型

如果想获取当前已连接上的所有蓝牙设备，可以在这两个广播中手动维护一个连接设备的列表。

像下面这样：

/**
 * 记录当前正在连接的所有蓝牙输入设备
 */
public List<BluetoothDevice> connectedBluetoothDevices = new ArrayList<BluetoothDevice>();

if (intent.getAction().equals(BluetoothDevice.ACTION_ACL_CONNECTED)) {
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    if (isInputDevice(device)) {
        List<BluetoothDevice> connectedBluetoothDevices = ((MyApplication) getApplication()).connectedBluetoothDevices;
        if (!connectedBluetoothDevices.contains(device)) {
            connectedBluetoothDevices.add(device);
        }
    }
} else if (intent.getAction().equals(BluetoothDevice.ACTION_ACL_DISCONNECTED)) {
    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
    if (isInputDevice(device)) {
        List<BluetoothDevice> connectedBluetoothDevices = ((MyApplication) getApplication()).connectedBluetoothDevices;
        connectedBluetoothDevices.remove(device);
    }
}

/**
 * 判断蓝牙设备是否是输入设备,这里认为 PERIPHERAL是输入设备
 */
private boolean isInputDevice(BluetoothDevice device) {
    int deviceMajorClass = device.getBluetoothClass().getMajorDeviceClass();
    if (deviceMajorClass == BluetoothClass.Device.Major.PERIPHERAL) {
        return true;
    }

    return false;
}