dear all:
i'm seeing wifi display source code and wondering
why using   !mDesiredDevice.deviceAddress.equals(device.deviceAddress) and
 !mConnectedDevice.deviceAddress.equals(device.deviceAddress) to test?
meaning not equal??
plz help!
-------------------------------------------------------------------------------------------------------------
 private void connect(final WifiP2pDevice device) {
        if (mDesiredDevice != null
                &&
!mDesiredDevice.deviceAddress.equals(device.deviceAddress)) {
            if (DEBUG) {
                Slog.d(TAG, "connect: nothing to do, already connecting to "
                        + describeWifiP2pDevice(device));
            }
            return;
        }

        if (mConnectedDevice != null
                &&
!mConnectedDevice.deviceAddress.equals(device.deviceAddress)
                && mDesiredDevice == null) {
            if (DEBUG) {
                Slog.d(TAG, "connect: nothing to do, already connected to "
                        + describeWifiP2pDevice(device) + " and not part
way through "
                        + "connecting to a different device.");
            }
            return;
        }

...
    }

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