這是我如何使用反射做到的。我沒有檢查過這段代碼現在是否工作了一段時間，所以它可能不是：
class BluetoothHeadset
{
private static final String TAG = Tags.getTag(BluetoothHeadset.class);
private static final String BLUETOOTH_HEADSET_CLASS_NAME = "android.bluetooth.IBluetoothHeadset";
private static final String BLUETOOTH_HEADSET_STUB_CLASS_NAME = BLUETOOTH_HEADSET_CLASS_NAME+"$Stub";
public static final String ACTION_BLUETOOTH_HEADSET_SERVICE = BLUETOOTH_HEADSET_CLASS_NAME;
public static final String ACTION_STATE_CHANGED = "android.bluetooth.headset.action.STATE_CHANGED";
public static final String ACTION_AUDIO_STATE_CHANGED = "android.bluetooth.headset.action.AUDIO_STATE_CHANGED";
public static final String EXTRA_AUDIO_STATE = "android.bluetooth.headset.extra.AUDIO_STATE";
/** A SCO audio channel is not established */
public static final int AUDIO_STATE_DISCONNECTED = 0;
/** A SCO audio channel is established */
public static final int AUDIO_STATE_CONNECTED = 1;
private static final String AS_INTERFACE_METHOD_NAME = "asInterface";
private static final String IS_CONNECTED_METHOD_NAME = "isConnected";
final Object m_service;
private BluetoothHeadset(Object service)
{
m_service = service;
}
static public BluetoothHeadset getBluetoothHeadset(IBinder service)
{
if (service == null)
{
return null;
}
Object proxy = null;
try
{
Class<?> clazz = Class.forName(BLUETOOTH_HEADSET_STUB_CLASS_NAME);
Method asInterfaceMethod = clazz.getMethod(AS_INTERFACE_METHOD_NAME, IBinder.class);
proxy = asInterfaceMethod.invoke(null, service);
}
catch(ClassNotFoundException ex)
{
String msg = String.format("Was not able to find %s class.",
BLUETOOTH_HEADSET_STUB_CLASS_NAME);
Log.e(TAG, msg, ex);
}
catch(NoSuchMethodException ex)
{
String msg = String.format("Was not able to find %s method in %s class.",
AS_INTERFACE_METHOD_NAME,
BLUETOOTH_HEADSET_STUB_CLASS_NAME);
Log.e(TAG, msg, ex);
}
catch(InvocationTargetException ex)
{
String msg = String.format("Was not able to invoke %s method in %s class.",
AS_INTERFACE_METHOD_NAME,
BLUETOOTH_HEADSET_STUB_CLASS_NAME);
Log.e(TAG, msg, ex);
}
catch(IllegalAccessException ex)
{
String msg = String.format("Illegal access while invoking %s method in %s class.",
AS_INTERFACE_METHOD_NAME,
BLUETOOTH_HEADSET_STUB_CLASS_NAME);
Log.e(TAG, msg, ex);
}
if(proxy == null) return null;
return new BluetoothHeadset(proxy);
}
public Boolean isDeviceConnected(BluetoothDevice device)
{
//invoke: boolean isConnected(BluetoothDevice device);
try
{
Class<?> clazz = m_service.getClass();
Method isConnectedMethod = clazz.getMethod(IS_CONNECTED_METHOD_NAME, BluetoothDevice.class);
Object result = isConnectedMethod.invoke(m_service, device);
return (Boolean)result;
}
catch(NoSuchMethodException ex)
{
String msg = String.format("Failed to find %s method in class %s.",
IS_CONNECTED_METHOD_NAME, m_service.getClass().getName());
Log.e(TAG, msg, ex);
}
catch(InvocationTargetException ex)
{
String msg = String.format("Failed to invoke %s method in class %s.",
IS_CONNECTED_METHOD_NAME, m_service.getClass().getName());
Log.e(TAG, msg, ex);
}
catch(IllegalAccessException ex)
{
String msg = String.format("Illegal access when invoking %s method in class %s.",
IS_CONNECTED_METHOD_NAME, m_service.getClass().getName());
Log.e(TAG, msg, ex);
}
catch(Exception ex)
{
Log.e(TAG, "Unknown exception was thrown.", ex);
}
return null;
}
}