android 藍牙設備監聽廣播

藍牙權限 <uses-permission android:name="android.permission.BLUETOOTH" />

1、監聽手機本身藍牙狀態的廣播

手機藍牙開啟關閉時發送

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 手機藍牙關閉");
            break;
        case BluetoothAdapter.STATE_TURNING_OFF:
            Log.d("aaa", "STATE_TURNING_OFF 手機藍牙正在關閉");
            break;
        case BluetoothAdapter.STATE_ON:
            Log.d("aaa", "STATE_ON 手機藍牙開啟");
            break;
        case BluetoothAdapter.STATE_TURNING_ON:
            Log.d("aaa", "STATE_TURNING_ON 手機藍牙正在開啟");
            break;
    }
}

2、監聽藍牙設備配對狀態的廣播

藍牙設備配對和解除配對時發送

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 刪除配對");
            break;
        case BluetoothDevice.BOND_BONDING:
            Log.d("aaa", "BOND_BONDING 正在配對");
            break;
        case BluetoothDevice.BOND_BONDED:
            Log.d("aaa", "BOND_BONDED 配對成功");
            break;
    }
} 

3、監聽藍牙設備連接和連接斷開的廣播

藍牙設備連接上和斷開連接時發送, 這兩個監聽的是底層的連接狀態

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 可以獲取藍牙設備的類型

如果想獲取當前已連接上的所有藍牙設備，可以在這兩個廣播中手動維護一個連接設備的列表。

像下面這樣：

/**
 * 記錄當前正在連接的所有藍牙輸入設備
 */
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);
    }
}

/**
 * 判斷藍牙設備是否是輸入設備,這里認為 PERIPHERAL是輸入設備
 */
private boolean isInputDevice(BluetoothDevice device) {
    int deviceMajorClass = device.getBluetoothClass().getMajorDeviceClass();
    if (deviceMajorClass == BluetoothClass.Device.Major.PERIPHERAL) {
        return true;
    }

    return false;
}