These are called as Layout Parameters. They are used by sub-views to tell the parent view how they want to be laid on the Activity screen i.e we can set the Horizontal and Vertical size of a view using Layout Parameters.
To specify how big a view must be we use android:layout_width and android:layout_height attributes.
The values of these attributes can either one of fill_parent, match_parent or wrap_content.
This is same as match_parent, fill_parent was Dipricated in API level 8. So if you are using API level 8 or above you must avoid using fill_parent
Lets follow the same steps as we did for match_parent, just instead use fill_parent everywhere.
You would see that there is no difference in behaviour in both fill_parent and match parent.
- When you set layout width and height as match_parent, it will occupy the complete area that the parent view has, i.e. it will be as big as the parent.
Note : If parent is applied a padding then that space would not be included.
When we create a layout.xml by default we have RelativeLayout as default parent View with android:layout_width="match_parent" and android:layout_height="match_parent" i.e it occupies the complete width and height of the mobile screen.
- answered 5 years ago
- B Butts