Android 檢測是否連接藍牙耳機

private void handleHeadsetStateChange()
    {
    	Intent intent = new Intent(Intent.ACTION_HEADSET_PLUG);
    	if(BluetoothProfile.STATE_CONNECTED == adapter.getProfileConnectionState(BluetoothProfile.HEADSET))
    	{
    		intent.putExtra("state", 1);
    		intent.putExtra("microphone", 1);
				mContext.sendBroadcast(intent);
    	}
    	else if(BluetoothProfile.STATE_DISCONNECTED == adapter.getProfileConnectionState(BluetoothProfile.HEADSET))
    	{
    		intent.putExtra("state", -1);
				mContext.sendBroadcast(intent);
    	}
    }