Is R..layout.listview the same as R.id.listview

Question

I am new to Android programming. I created a ListView and its android:id="@+id/listView1"

 ListView list= (ListView) findViewById(R.id.listView1); ListView list= (ListView) findViewById(R.layout.listView1); 

Will it reference the same ListView? Is there a difference between the two fragments?

Answer 1

No. Both variants.

R.id.listView1: -

Represents the view identifier that is declared in the layout (your XML file) as android:id="@+id/listView1"

and

R.layout.listView1: -

Represents a layout file (xml file), which in res -> layout dir

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You can do

 ListView list= (ListView) findViewById(R.id.listView1); 

because ListView has a View family.

But you cannot do

 ListView list= (ListView) findViewById(R.layout.listView1); 

Answer 2

Both represent various means.

 android:id="@+id/listView1" 

represent a widget inside a layout (XML file) that has an attribute as follows: -

 android:id="@+id/listView1" 

where as R.layout.listView1 shows that you have an XML file in the layout folder named listView1 .

therefore both options.

Answer 3

 android:id="@+id/listView1" 

this may be the id of the list you created in the xml file.

 ListView list= (ListView) findViewById(R.id.listView1); 

and ou represent the list in your java file, calling the identifier.

 ListView list= (ListView) findViewById(R.layout.listView1); 

this is a way of representing the layout in your java file by calling the layout id