如果在Android应用程序中关闭蓝牙通知

Question

我目前正在开发一个Android应用程序..我必须在应用程序当前正在运行时关闭设备的蓝牙时通知用户..如何通知远程设备tat BT已关闭？提前致谢

Answer 1

使用intent动作注册BroadcastReceiverBluetoothAdapter.ACTION_STATE_CHANGED并将notifiyng代码移动到onReceive方法中.不要忘记检查新状态是否为OFF

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

Answer 2

如果要检测用户何时断开其蓝牙连接,以及稍后检测用户何时将蓝牙断开连接,则应执行以下步骤:

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));