First program in android

Following given steps:-
1. Install Android Studio Given link
https://developer.android.com/studio/index.html

2.Start Android Studio
3.Go to file -> New->New Project.
4.Some changes in MainActivity.java file

first changes in activity.xml file

<TextView   

 android:id="@+id/Textview"    

 android:layout_width="wrap_content"    

 android:layout_height="wrap_content"
 android:text="Hello word" />

    then run your project and output is:-

      Hello Word on mobile screen