Android Programming in a Day: The Power Guide for Beginners In Android App Programming! Pdfdrive com


if  (id == R.id. action_settings



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Android Programming in a Day The Power Guide for Beginners In Android App Programming! ( PDFDrive )

if 
(id == R.id.
action_settings
) {
            
return true
;
        }
        
return super
.onOptionsItemSelected(item);
    }
}
 


XML Writing
Primarily, you will not be writing too much XML in your app if you are going to
use  IDEs.  After  all,  most  of  the  XML  writing  tasks  you  will  do  should  be
dedicated in designing your app’s appearance. Since the IDEs will do the writing
for you when you drag and drop the views that you want to appear, XML writing
should not be a big issue.
Nevertheless,  if  you  want  full  control  of  your  app’s  properties  and  appearance,
then it is essential that you edit your app’s XML files on your source code editor.
Do not worry; compared to Java programming, XML writing is much easier.
If  you  are  familiar  with  HTML  (HyperText  Markup  Language),  then  it  will  be
easy  for  you  to  understand  XML  (eXtensible  Markup  Language).  XML  is
technically similar to HTML. The main difference is that XML is much simpler
and  straight  to  the  point.  Machines  and  humans  (those  who  are  familiar  with
XML of course) can easily understand it.
Below is an example of an activity’s XML file:
    xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
    android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
    android:layout_width="wrap_content"
        android:layout_height="wrap_content" />


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