What is setContentView R layout main

Question

I understand that it has to do with the App layout  but when do I have to use it  I tried to look for a link that explained this method  but I couldn t find it  Thank you in advance

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public void onCreate Bundle savedinstanceState                super onCreate savedinstanceState                Button testButon   new Button this                setContentView testButon                show

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Set the activity content from a layout resource  The resource will be inflated  adding all top-level views to the activity    Activity is basically a empty window SetContentView is used to fill the window with the UI provided from layout file    incase of setContentView R layout somae file   Here layoutfile is inflated to view and added to the Activity context Window

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As per the documentation       Set the activity content from a layout resource  The resource will be inflated  adding all    top-level views to the activity    Your Launcher activity in the manifest first gets called and it set the layout view as specified in respective java files setContentView R layout main    Now this activity uses setContentView R layout main  to set xml layout to that activity which will actually render as the UI of your activity

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You can set content view  or design  of an activity  For example you can do it like this too    public void onCreate Bundle savedinstanceState        super onCreate savedinstanceState        Button testButon   new Button this        setContentView testButon          Also watch this tutorial too

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Why setContentView   in Android Had Been So Popular Till Now   setContentView int layoutid  - method of activity class  It shows layout on screen   R layout main - is an integer number implemented in nested layout class of R java class file    At the run time device will pick up their layout based on the id given in setcontentview   method

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In Android the visual design is stored in XML files and each Activity is associated to a design   setContentView R layout main    R means Resource  layout means design   main is the xml you have created under res- gt layout- gt main xml  Whenever you want to change the current look of an Activity or when you move from one Activity to another  the new Activity must have a design to show  We call setContentView in onCreate with the desired design as argument

[android] What is setContentView(R.layout.main)?

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