Scribd
Upload
7 views12 pages

Android Layouts Lecture4

The document provides an overview of various Android layout types, including LinearLayout, RelativeLayout, ConstraintLayout, FrameLayout, TableLayout, and GridLayout, along with their functionalities and analogies for better understanding. It emphasizes performance considerations such as avoiding deep hierarchies and preferring ConstraintLayout for complex UIs. Additionally, it poses questions regarding the differences and appropriate use cases for these layouts.

Uploaded by

naresh
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPTX, PDF, TXT or read online on Scribd
7 views12 pages

Android Layouts Lecture4

The document provides an overview of various Android layout types, including LinearLayout, RelativeLayout, ConstraintLayout, FrameLayout, TableLayout, and GridLayout, along with their functionalities and analogies for better understanding. It emphasizes performance considerations such as avoiding deep hierarchies and preferring ConstraintLayout for complex UIs. Additionally, it poses questions regarding the differences and appropriate use cases for these layouts.

Uploaded by

naresh
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPTX, PDF, TXT or read online on Scribd
You are on page 1/ 12

Android Layouts:

Technical Details

Mastering ViewGroups & Layout Blueprints


• Layout = ViewGroup that arranges View
What is a and ViewGroup children
• Defines positioning + sizing
Layout? • Analogy: Think of layout as the floor plan
for placing your app's furniture (views).
• Stacks children vertically or horizontally
• Use layout_weight for proportional sizing
LinearLayout • Analogy: Like stacking books on a shelf.
• Code: <LinearLayout
orientation='vertical'>...</LinearLayout>
Organizes its children into a single horizontal or vertical
Linear Layout row and creates a scrollbar if the length of the window
exceeds the length of the screen.

wrap_content: tells your view to size itself to the dimensions


required by its content.
match_parent: tells your view to become as big as its parent
view group allows.
RelativeLayout

• Position views relative to each other /


parent
• Example: layout_below,
alignParentTop
• Analogy: Place the lamp to the right
of the sofa.
• Code:
<RelativeLayout>...</RelativeLayout>
ConstraintLayout

• Flexible, flat hierarchy


• Set constraints on all sides
• Chains, guidelines
• Analogy: Tie furniture with elastic bands to
walls or each other.
• Code: <Button
app:layout_constraintTop_toTopOf='parent' ... /
>
FrameLayout

Stack views on top of


each other

Typically, one visible at a


time

Analogy: Stack of playing


cards — top one shows.
TableLayout

Rows and columns

Columns auto-sized

Analogy: Set plates on


a dining table.
GridLayout
• Like TableLayout
Lik but more flexible
e
• Span
Sp rows/columns
an
• Analogy: Lay tiles
La on a grid floor.
y
Performance Considerations

Av • Avoid deep hierarchies (slower measure/layout


oi pass)
d
Pr • Prefer ConstraintLayout for complex UIs
ef
er
Fla • Flatten hierarchy for faster rendering
tte
n
Summary
Now Answer these Questions
What is the difference between LinearLayout and
ConstraintLayout in terms of flexibility and
performance?
When should you use FrameLayout instead of
RelativeLayout or LinearLayout?

How can TableLayout and GridLayout be


differentiated, and when would you prefer one over
the other?

You might also like