Activity

Activity

• An activity is the basis of android application

• A single activity defines a single viewable screen,ie.the actions not the layout.

• Activity have structured life cycle.

Let us see how  the basic main activity java file looks like

From the above HelloworldActivity.java file

setContentView(R.layout.main):- means the following

setContentView:-sets the specified view as the view of the   activity.

R.layout.main:-constant from R class referencing layout from the main.xml