如何知道藍牙何時斷開

Question

藍牙與設備斷開連接時，我試圖“捕捉”。 我正在使用以下代碼：

if (BluetoothDevice.ACTION_ACL_DISCONNECTED.equals(action)){
            deleteNotification();
            setWarningState(WarningState.RedWarning);
            showNotification("You are parked");

但是當我通過關閉遠程設備或通過關閉手機中的藍牙開關斷開藍牙連接時，該狀態將不會輸入。

當即時通訊使用此：

BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)

它的工作正常（建立連接后）。 為什么會這樣，我如何使它起作用？ 謝謝！

Answer 1

您是否已注冊以下IntenFilters

IntentFilter f1 = new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECT_REQUESTED);
IntentFilter f2 = new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECTED);
this.registerReceiver(mReceiver, f1);
this.registerReceiver(mReceiver, f2);

Answer 2

 IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
        registerReceiver(mBluetoothReceiver, filter);

 private final BroadcastReceiver mBluetoothReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();

            if (action!=null && action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
                final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,
                        BluetoothAdapter.ERROR);
                switch (state) {
                    case BluetoothAdapter.STATE_OFF:

                        break;
                    case BluetoothAdapter.STATE_ON:

                        break;

                }
            }
        }
    };