有什么方法可以找出在Android 2.3(2.3之后的任何版本)中以编程方式启用或禁用了蓝牙网络共享吗？

我不是要启用/禁用它,而是要知道当前是否启用它.

解决方法:

事实证明,BluetoothPan(个人局域网)是网络共享的关键字.我仔细研究了API文档和Android源代码,但注释中的简短示例具有误导性.这张海报提供了一个示例,但最初我遇到了麻烦：
Android BluetoothPAN to create TCP/IP network between Android device and Windows7 PC

我尝试了多种其他方法,包括检查BT设备的IP地址.但是,不存在蓝牙网络设备,因此没有要检查的IP.
Detect USB tethering on android

返回BluetoothPan代码…第一个线程中的示例不完整(没有ServiceListener实现).我尝试了一个标准的,但是isTetheringOn代理调用失败.关键之处在于onServiceConnected()回调至少需要一行代码,否则编译器会对其进行优化.它也不应像大多数其他示例一样断开代理的连接.这是工作代码：

BluetoothAdapter mBluetoothAdapter = null;
Class<?> classBluetoothPan = null;
Constructor<?> BTPanCtor = null;
Object BTSrvInstance = null;
Class<?> noparams[] = {};
Method mIsBTTetheringOn;

@Override
public void onCreate() {
    Context MyContext = getApplicationContext();
    mBluetoothAdapter = getBTAdapter();
    try {
        classBluetoothPan = Class.forName("android.bluetooth.BluetoothPan");
        mIsBTTetheringOn = classBluetoothPan.getDeclaredMethod("isTetheringOn", noparams);
        BTPanCtor = classBluetoothPan.getDeclaredConstructor(Context.class, BluetoothProfile.ServiceListener.class);
        BTPanCtor.setAccessible(true);
        BTSrvInstance = BTPanCtor.newInstance(MyContext, new BTPanServiceListener(MyContext));
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

private BluetoothAdapter getBTAdapter() {
    if (android.os.Build.VERSION.SDK_INT <= android.os.Build.VERSION_CODES.JELLY_BEAN_MR1)
        return BluetoothAdapter.getDefaultAdapter();
    else {
        BluetoothManager bm = (BluetoothManager) getSystemService(BLUETOOTH_SERVICE);
        return bm.getAdapter();
    }
}

// Check whether Bluetooth tethering is enabled.
private boolean IsBluetoothTetherEnabled() {
    try {
        if(mBluetoothAdapter != null) {
            return (Boolean) mIsBTTetheringOn.invoke(BTSrvInstance, (Object []) noparams);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return false;
}

public class BTPanServiceListener implements BluetoothProfile.ServiceListener {
    private final Context context;

    public BTPanServiceListener(final Context context) {
        this.context = context;
    }

    @Override
    public void onServiceConnected(final int profile,
                                   final BluetoothProfile proxy) {
        //Some code must be here or the compiler will optimize away this callback.
        Log.i("MyApp", "BTPan proxy connected");
    }

    @Override
    public void onServiceDisconnected(final int profile) {
    }
}