We gonna create a new project, for after create our first hello world s
1.- Create a new project with empty layout.
2.- Add widgets to layout.
2.1- Add a TextView with id txtView and empty text.
3.1- Add a Button with id btnClick and text "Hello, wolrd"; 3.- Add evente OnClickListener for update text of TextView.
3.1.- Declare globar vars.
* Button btnHello;
* TextView txtMessage;
3.2.- Set Vars with the id of the gadgets.
* txtMessage = (TextView) findViewById(R.id.txtView);
* btnHellow = (TextView) findViewById(R.id.btnClick);
4.- Execute the app.