Question

我目前正在开发一个Android应用程序.. 我必须在蓝牙时通知用户当应用程序关闭时，设备关闭正在运行.. 如何通知BT BT的远程设备关掉？提前致谢

Answer 1

使用意图操作BluetoothAdapter.ACTION_STATE_CHANGED注册 BroadcastReceiver ，并将您的notifiyng代码移至onReceive方法。不要忘记检查新状态是否关闭

if(BluetoothAdapter.ACTION_STATE_CHANGED.equals(intent.getAction())) {
    if(intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, -1) 
        == BluetoothAdapter.STATE_OFF)
        // Bluetooth was disconnected
}

Answer 2

如果您想检测用户何时断开其蓝牙连接，稍后检测用户何时将蓝牙断开连接，您应该执行以下步骤：

1）获取用户BluetoothAdapter：

BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();

2）创建和配置您的Receiver，代码如下：

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {

        String action = intent.getAction();

        // It means the user has changed his bluetooth state.
        if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {

            if (btAdapter.getState() == BluetoothAdapter.STATE_TURNING_OFF) {
                // The user bluetooth is turning off yet, but it is not disabled yet.
                return;
            }

            if (btAdapter.getState() == BluetoothAdapter.STATE_OFF) {
                // The user bluetooth is already disabled.
                return;
            }

        }
    }
};

3）将您的BroadcastReceiver注册到您的活动中：

this.registerReceiver(mReceiver, new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));

如果在Android应用程序中关闭蓝牙通知

2 个答案: