You might want to rephrase your question. Do you mean that you need help in making an android app?

You can just google it for some of the techniques for Mobile app marketing

For your reference, The Beginner’s Guide to Mobile App Marketing

Create blogs, web properties, and social media accounts related to topics that people who would potentially download your app be interested in.

Build these properties and market content with customized ads displaying your app.

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Run some ads on android related sites. Or contact some popular sites to give your app reviews.

You can promote your apps in the high profile site related to your field it helpful for your traffic and improve the popularity of your website also.

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