与汽车的蓝牙连接

Question

我正在尝试检查我的设备何时与汽车连接。我假设汽车就像蓝牙耳机一样，因此我在 activity onCreate 中使用了以下代码：

    // Get the default adapter
    BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    BluetoothProfile.ServiceListener mProfileListener = new BluetoothProfile.ServiceListener() {
        public void onServiceConnected(int profile, BluetoothProfile proxy) {
            Time today = new Time(Time.getCurrentTimezone());
            today.setToNow();
            if (profile == BluetoothProfile.HEADSET) {
                mBluetoothHeadset = (BluetoothHeadset) proxy;

                LogginUtil.logString("BluetoothApp", "Headset event called at " + today.format("%k:%M:%S") + " - " + profile);
            } else {
                LogginUtil.logString("BluetoothApp", "Other event called at " + today.format("%k:%M:%S") + " - " + profile);
            }
        }
        public void onServiceDisconnected(int profile) {
            if (profile == BluetoothProfile.HEADSET) {
                mBluetoothHeadset = null;
                Time today = new Time(Time.getCurrentTimezone());
                today.setToNow();
                LogginUtil.logString("BluetoothApp", "Headset event disconnected at " + today.format("%k:%M:%S"));
            }
        }
    };
    // Establish connection to the proxy.
    mBluetoothAdapter.getProfileProxy(getApplicationContext(), mProfileListener, BluetoothProfile.HEADSET);

当我启动应用程序时，蓝牙打开和关闭，我得到以下输出：

Headset event called at "current time" - 1

当我将我的设备与汽车配对时，我得到完全相同的输出：

Headset event called at "current time" - 1

我需要做什么才能检测到我的设备已通过蓝牙主动连接到汽车？

在此先感谢您，如果您还有其他需要，请告诉我。

编辑说明

以防我的问题被误解。当设备进入通过蓝牙连接到汽车的状态时，我想收到通知（只是一个日志）。这样的事情可能吗？

Answer 1

我现在无法尝试，但也许这可行：

int[] validStates = {BluetoothHeadset.STATE_AUDIO_CONNECTED};
List<BluetoothDevice> mConnectedDevices =
  mBluetoothHeadset.getDevicesMatchingConnectionStates(validStates);
if (!mConnectedDevices.isEmpty()) {
    // You've got something connected here
}

来源：

http://developer.android.com/reference/android/bluetooth/BluetoothHeadset.html http://developer.android.com/reference/android/bluetooth/BluetoothProfile.html#getConnectedDevices()

Answer 2

快速 google 找到了这个答案，它适用于很多人，所以我很确定它应该适合你。资料来源：How to get Bluetooth Headset connection state on application start-up using Android2.2?

private static final String ACTION_BT_HEADSET_STATE_CHANGED  = "android.bluetooth.headset.action.STATE_CHANGED";
private static final int STATE_CONNECTED = 0x00000002; 
private static final int STATE_DISCONNECTED  = 0x00000000;  
private static final String EXTRA_STATE = "android.bluetooth.headset.extra.STATE";

private BroadcastReceiver mBlueToothHeadSetEventReceiver = new BroadcastReceiver() {

@Override
public void onReceive(Context context, Intent intent) {
    try {
        String action = intent.getAction();

        if(action == null)
            return;

        if(action.equals(ACTION_BT_HEADSET_STATE_CHANGED)){
            int extraData = intent.getIntExtra(EXTRA_STATE  , STATE_DISCONNECTED);
            if(extraData == STATE_CONNECTED ){

                //TODO :

            }else if(extraData == STATE_DISCONNECTED){

                //TODO:
            }
        }
        } catch (Exception e) {

        //TODO:

        }
}
};

与汽车的蓝牙连接

Bluetooth connection with car

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bluetooth