我需要检查哪些BT耳机当前连接（而不仅仅是配对）的OS 2.0 - 2.3。这样的功能并不存在，直到API版本11，引入蓝牙耳机类的地方。但是，已经存在的类在以前的API被称为BluetoothHeadset，但它不是向公众开放。下面是它的文档：的http://www.kiwidoc.com/java/l/x/android/android/9/p/android.bluetooth/c/BluetoothHeadset.于是，我尝试使用反射来调用isConnected的方法，但我pretty的可怕的反省，我发现了一个错误 java.lang.IllegalArgumentException：如果对象不是这个类的一个实例。

I need to check which BT headsets are currently connected (not just paired) in OS 2.0 - 2.3. Such functionality doesn't exist until API version 11, where a Bluetooth Headset class was introduced. But there already existed a class called BluetoothHeadset in prior APIs, but it wasn't publicly accessible. Here's the documentation for it: http://www.kiwidoc.com/java/l/x/android/android/9/p/android.bluetooth/c/BluetoothHeadset. So, I was trying to use reflection to invoke the "isConnected" method, but I'm pretty horrible at reflection, and I'm getting an error java.lang.IllegalArgumentException: object is not an instance of the class.

我配对的设备使用 BluetoothDevice.getBondedDevices（）的列表，我尝试使用 isConnected（）每一种方法。这里的code：

I got a list of paired devices using BluetoothDevice.getBondedDevices(), and I try to use the isConnected() method on each one. Here's the code:

public boolean isBtDevConnected(BluetoothDevice btDev){
    boolean connected  = false;
    try {
        Class<?> BTHeadset = Class.forName("android.bluetooth.BluetoothHeadset");
        Method isConnected = BTHeadset.getMethod("isConnected", new Class[] {BluetoothDevice.class});
                connected = isConnected.invoke(BTHeadset, new Object[] {btDev});
            }
        }
    } catch (Exception e) {
        WriteToLog(e);
    }
    return connected;
}

我得到的异常的调用方法就行，但我不知道我做错了。

I get the exception on the line that invokes the method, but I'm not sure what I'm doing wrong.

推荐答案

BluetoothHeadset是通过工控机控制蓝牙耳机服务代理对象。

BluetoothHeadset is a proxy object for controlling the Bluetooth Headset Service via IPC.

使用getProfileProxy（背景下，BluetoothProfile.ServiceListener，int）以获得BluetoothHeadset代理对象。使用closeProfileProxy（INT，BluetoothProfile）以贴心的服务连接。

Use getProfileProxy(Context, BluetoothProfile.ServiceListener, int) to get the BluetoothHeadset proxy object. Use closeProfileProxy(int, BluetoothProfile) to close the service connection.

Android的只支持一个连接蓝牙耳机的时间。每一种方法是受保护的，其相应的权限。

Android only supports one connected Bluetooth Headset at a time. Each method is protected with its appropriate permission.

来源：的http://developer.android.com/reference/android/bluetooth/BluetoothHeadset.html