how to start android development?

If you want to start to develop android application.You should be able to do prgraming in java.You should have some basic concepts of java ,oop.If you have these then obviously you will enjoy coding and can easily built hundreds of android applications and can earn millions of dollars from google play store.
    I think first you should install eclipse from the official site of eclipse.At this you should make a good practice of your java coding.
  You should understand the basics of java how actually work is done.how many constructors are in your program how they support you prgram to get the output .

After the basic implementation of java concepts on eclipse you should install the lattest version of android studio.And all is done Now You Can create your first android application.

                                   You should click on Start a new Android Studio Project After That You Have following interface

                                                                                                                                    

You can write the name of application on highlighted area

Click on next.

as you are new you should click on empty activity

you can customize your java and xml file names accrding to your will then click on the button finish and all is done.

All is done successfully you have created your first android application and the output of this application is following.

Congrats