How to create app for old android devices (3.X, 4.0.X)?

Hi all, I am trying to make an app but It should be supported from old version of android such as 3.X to recent version. but it is not running below android platform version 4.4.

could you please help me?

You could try to install older API version in Android SDK tools and then edit your confiog.xml to add min nimal version of SDK:

<platform name="android">
    <preference name="android-minSdkVersion" value="14" />
   <preference name="android-targetSdkVersion" value="14"/>
</platform>

Then you must test on real devices because it’s not sure that all CSS or other features are supported. In such case, using Crosswalk can help.

thanks, it is not lunching on emulator (api 14) but manually install on my Huawei 4.0.1 Tablet. but The app speed is very slow how could i optimize the speed or optimize the app’s user Interface motions more smooth?

Try using Crosswalk.
You could also optimise your project by using a good build process like the one from Generator-M-Ionic