Update your android SDK to latest version. If required then update ADT plugin also to make it compatible with SDK. Android KitKat 4.4 refers to sdk version 19. Once you update your android SDK to Latest android release. you will get all the sample code and sample application which is launched in latest real ease.
Create any sample application from Android KitKat 4.4 using existing source code.
And now the issue is how to create eumlator for android KitKat 4.4, answer is easy just like you are creating till date.
But Main trick is Use host GPU to be selected.
Now our mind will think what is host GPU, its clearly started at android documentation use GPU for hardware acceleration for your emulator, you can do it using command line after creating emulator but for Android KitKat do it while creating emulator
"If you want to have graphics acceleration enabled by default for this AVD, in the Hardware section, click New, selectGPU emulation and set the value to Yes."