How to make app?

Please give me some app idea to create a app. I am interesting to start app business. But I have no idea about this.

That is the million dollar question

You have 3 options
1 Learn Mobile App development
2 search free app creator to build an app
3 Use paid app creator to create app with high functionality. You will select basic outlay… they will make app for you…

Learn to code in Java (if you don’t already know)

Get the Android SDK (it’s free from the getting started link below)

Use the free online resources

Getting Started | Android Developers

Practise, practise, practise

You shouldn’t need to pay anything to get started (except for hardware if you don’t have a PC), there are loads and loads of good free resources online. The Google android developer resources linked to above are a good place to start.

Well a developer license also.