Half life 2 Android without controller..?

Hi.I just installed half life 2 for Android and managed to run it on my nexus 4 using gltools.but now I can't play because I don't have a controller.I tried using gamerkeyboard+ to play.the buttons are working but the dpad only works in menu and I can't move during gameplay.so if there is any way in which I could play without a controller then it would be great.thanks