Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Philly ETE 2017: Loving Lean Android Layouts
Search
Huyen Tue Dao
April 18, 2017
Technology
0
250
Philly ETE 2017: Loving Lean Android Layouts
Huyen's talk at Philly ETE on performance and efficiency in Android layouts.
Huyen Tue Dao
April 18, 2017
Tweet
Share
More Decks by Huyen Tue Dao
See All by Huyen Tue Dao
Less Imperative with More Kotlin
queencodemonkey
0
260
Øredev 2017: Cool ConstraintLayout
queencodemonkey
3
280
Øredev 2017: Measure. Layout. Draw. Repeat.
queencodemonkey
0
350
Be Like Water: Keeping Up with Android
queencodemonkey
2
280
DevFest DC 2017: Cool ConstraintLayout
queencodemonkey
1
13k
Chicago Roboto 2017: Cool ConstraintLayout
queencodemonkey
9
1k
Droidcon Boston 2017: Cool ConstraintLayout
queencodemonkey
6
470
My Life in Android
queencodemonkey
1
330
DevFest MN 2017: Cool ConstraintLayout
queencodemonkey
1
460
Other Decks in Technology
See All in Technology
可視化がやりたくてMIERUNEに転職した話 〜“思考のための道具”とコンピューターによる新たな表現〜 / MIERUNE JCT - Tokyo 2024
sorami
2
460
C# 13 / .NET 9 の新機能 (RC 1 時点)
nenonaninu
1
1.1k
kube-vipとkube-proxy置き換えCiliumを積んだ究極のK3sクラスタを建てる
logica0419
3
180
Consoles, printk, Nested-NMIs_ Oh my!
ennael
PRO
0
150
AWSへのNIST SP800-171管理策 導入に向けての整備/20240930 Mitsutoshi Matsuo
shift_evolve
0
140
Renovate ではじめる運用レスなライブラリ更新 / 令和最新版 他人に自慢したいヤバいCI/CD LT会 @ yabaibuki.dev #2
ponkio_o
PRO
1
130
エンジニアは伝え方が9割/90% of what engineers need is communication skills
ykanoh
2
140
Interfacing Kernel C APIs from Rust
ennael
PRO
0
200
Sansanにおける全社横断データ分析基盤の挑戦と未来 / Challenges and Future of Cross-Organizational Data Analytics Platform at Sansan
sansan_randd
2
300
【shownet.conf_】多様化するネットワーク環境を柔軟に統合するルーティングテクノロジー
shownet
PRO
0
270
LINEヤフー新卒採用 コーディングテスト解説 アルゴリズム問題編
lycorp_recruit_jp
0
12k
【インフラエンジニアbooks】30分でわかる「AWS継続的セキュリティ実践ガイド」
hssh2_bin
1
470
Featured
See All Featured
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
355
29k
YesSQL, Process and Tooling at Scale
rocio
167
14k
Fantastic passwords and where to find them - at NoRuKo
philnash
50
2.8k
Testing 201, or: Great Expectations
jmmastey
38
7k
10 Git Anti Patterns You Should be Aware of
lemiorhan
653
59k
The Power of CSS Pseudo Elements
geoffreycrofte
71
5.3k
Faster Mobile Websites
deanohume
304
30k
Web development in the modern age
philhawksworth
205
10k
How to name files
jennybc
77
98k
How to train your dragon (web standard)
notwaldorf
87
5.6k
5 minutes of I Can Smell Your CMS
philhawksworth
202
19k
The Brand Is Dead. Long Live the Brand.
mthomps
53
38k
Transcript
HUYEN TUE DAO @QUEENCODEMONKEY LOVING LEAN ANDROID LAYOUTS
LOVING LEAN ANDROID LAYOUTS <LinearLayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1">
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/help_im_being_repressed" android:textStyle="bold" style="@style/TextAppearance.AppCompat.Body1" /> <ImageView android:layout_width="0dp" android:layout_height=“@dimen/image_height" android:layout_weight="2" android:src="@drawable/berries_plate" android:scaleType="centerCrop" android:contentDescription="@null" /> <ImageView android:layout_width="0dp" android:layout_height="@dimen/image_height" android:layout_weight="1" android:src="@drawable/creme_brulee" android:scaleType="centerCrop" android:contentDescription="@null" /> </LinearLayout>
LOVING LEAN ANDROID LAYOUTS WHY LEAN LAYOUTS FINDING PROBLEMS FIXING
PROBLEMS GOOD PRACTICES
HOW ANDROID DRAWS LAYOUTS MEASURE LAYOUT DRAW DEPTH-FIRST TRAVERSAL INFLATION
PARENT MEASURES EACH CHILD CHILD CALCULATES MEASURED WIDTH/HEIGHT MEASURE OWN
CHILDREN (IF ANY) HOW ANDROID DRAWS LAYOUTS MEASURE LAYOUT DRAW
HOW ANDROID DRAWS LAYOUTS MEASURE LAYOUT DRAW PARENT SIZES AND
POSITIONS CHILD
HOW ANDROID DRAWS LAYOUTS MEASURE LAYOUT DRAW PARENT DRAWS PARENT
TELLS CHILDREN TO DRAW
LOVING LEAN ANDROID LAYOUTS WHY LEAN LAYOUTS FINDING PROBLEMS FIXING
PROBLEMS GOOD PRACTICES
WHY LEAN LAYOUTS #PERFMATTERS
PERFORMANCE = RESOURCES USED ∝COMPLEXITY
PERFORMANCE = RESOURCES USED ∝COMPLEXITY = # VIEWS/DEPTH OF HIERARCHY
PERFORMANCE = RESOURCES USED ∝COMPLEXITY = # VIEWS/DEPTH OF HIERARCHY
= # EXECUTIONS OF onMeasure()/onLayout()
PERFORMANCE = RESOURCES USED ∝COMPLEXITY = # VIEWS/DEPTH OF HIERARCHY
= # EXECUTIONS OF onMeasure()/onLayout() BAD PERFORMANCE = UI JANK
MAINTAINABILITY WHY LEAN LAYOUTS
RESOURCES USED∝COMPLEXITY ∝EFFORT TO MAINTAIN AND REFACTOR = READABILITY (PARSING
+ NESTING) + STABILITY
CHANGE IN SIZE/POSITION STARTS MEASURE/LAYOUT STARTING AT ROOT. SOME LAYOUTS
NEED MULTIPLE MEASURE/LAYOUT PASSES, E.G. RELATIVELAYOUT LISTS MAKE MANY COPIES OF SAME LAYOUT DEEP HIERARCHIES INCREASE COMPLEXITY AND DEPENDENCY WHERE IS THE PROBLEM?
LOVING LEAN ANDROID LAYOUTS WHY LEAN LAYOUTS FINDING PROBLEMS FIXING
PROBLEMS GOOD PRACTICES
HIERARCHY VIEWER FINDING PROBLEMS VISUALIZATION ANDROID DEVICE MONITOR BEST ON
PHYSICAL DEVICE | 4.1+
None
None
LAYOUT INSPECTOR FINDING PROBLEMS ANDROID MONITOR EXAMINE/DEBUG LAYOUT EVENTUALLY SUPERSEDE
HIERARCHY VIEWER
None
BLUEPRINT VIEW FINDING PROBLEMS
SYSTRACE FINDING PROBLEMS SYSTEM + APPLICATION PROCESS EXECUTION DATA DATA
TRACE → INTERACTIVE REPORTS SMOOTH UI → 60FPS → 16.6MS/FRAME
None
None
DUMPSYS FINDING PROBLEMS SYSTEM SERVICES STATUS FRAMES OF ANIMATION adb
shell dumpsys gfxinfo <PACKAGE_NAME> DETAILED FRAME TIMING INFO adb shell dumpsys gfxinfo <PACKAGE_NAME> framestats
OnFrameMetricsAvailableListener FINDING PROBLEMS MARSHMALLOW PUB/SUB API EQUIVALENT TO DUMPSYS FRAMESTATS
EXCEPT NOT LIMITED TO 120 FRAMES
LOVING LEAN ANDROID LAYOUTS WHY LEAN LAYOUTS FINDING PROBLEMS FIXING
PROBLEMS GOOD PRACTICES
MAKE LINT HAPPY FIXING PROBLEMS
None
LINT USELESS PARENT
LINT NESTED WEIGHTS
LINT TOO MUCH NESTING
SIMPLIFY AND REDUCE FIXING PROBLEMS
None
<LinearLayout > <ImageView /> <TextView /> </LinearLayout>
3 VIEWS, 2 LEVELS
<TextView… android:drawablePadding=“…" android:drawableEnd=“…"/> 1 VIEW, 1 LEVEL
None
None
SPANNABLES
<LinearLayout…> <TextView… style="@style/StyleA" /> <TextView… style="@style/StyleB" />
<TextView… style="@style/StyleA" /> </LinearLayout> 4 VIEWS, 2 LEVELS
<TextView…/> + Spannables 1 VIEW, 1 LEVEL
None
None
<FrameLayout… android:padding=“…” android:background=“…“> <LinearLayout /> </FrameLayout> 2 VIEWS,
2 LEVELS
<LinearLayout… android:padding=“…” android:background=“…“/> 1 VIEW, 1 LEVEL
None
None
<LinearLayout > <LinearLayout> <TextView /> <TextView />
</LinearLayout> <TextView /> </LinearLayout> 5 VIEWS, 3 LEVELS
<ConstraintLayout…> <TextView… /> <TextView… /> <TextView… />
</ConstraintLayout> 4 VIEWS, 2 LEVEL
CONSTRAINTLAYOUT MORE EXPRESSIVE MORE PERFORMANT FLATTEN HIERARCHIES REDUCE VIEWS
None
GO CUSTOM FIXING PROBLEMS CUSTOM VIEW/VIEWGROUP TOTAL CONTROL OVER LAYOUT/DRAW
BALANCE PERFORMANCE GAINS AND DEVELOPMENT EFFORT
GO CUSTOM FIXING PROBLEMS CUSTOM VIEW/VIEWGROUP TOTAL CONTROL OVER LAYOUT/DRAW
BALANCE PERFORMANCE GAINS AND DEVELOPMENT EFFORT
LOVING LEAN ANDROID LAYOUTS WHY LEAN LAYOUTS FINDING PROBLEMS FIXING
PROBLEMS GOOD PRACTICES
ANTICIPATE AND DEVELOP GOOD HABITS GOOD PRACTICES
SIMPLEST SOLUTIONS WHERE POSSIBLE GOOD PRACTICES
FEWER AND FLATTER NO RELATIVELAYOUT AT ROOT GOOD PRACTICES
DON’T LET PROBLEMS ACCUMULATE GOOD PRACTICES
BALANCE PERFORMANCE GAINS WITH DEVELOPMENT EFFORT GOOD PRACTICES
THANK YOU! SPEAKERDECK.COM/QUEENCODEMONKEY YOUTUBE.COM/ANDROIDDIALOGS RANDOMLYTYPING.COM HUYEN TUE DAO @QUEENCODEMONKEY
REFERENCES 63 ANDROID PERFORMANCE PATTERNS, WHY 60FPS? https://youtu.be/CaMTIgxCSqU DEVELOPING FOR
ANDROID: THE NAUGHTY BITS https://youtu.be/Q2qQoJlwqlk?t=36m4s HIERARCHY VIEWER https://developer.android.com/studio/profile/hierarchy-viewer.html LAYOUT INSPECTOR http://tools.android.com/tech-docs/layout-inspector
REFERENCES 64 TESTING DISPLAY PERFORMANCE http://developer.android.com/training/testing/performance.html ANALYZING UI PERFORMANCE WITH
SYSTRACE http://developer.android.com/tools/debugging/systrace.html OPTIMIZING LAYOUT HIERARCHIES http://developer.android.com/training/improving-layouts/optimizing-layout.html ANDROID PERFORMANCE PATTERNS, DOUBLE LAYOUT TAXATION https://www.youtube.com/watch?v=dB3_vgS-Uqo ANDROID PERFORMANCE PATTERN, INVALIDATIONS, LAYOUTS, AND PERFORMANCE https://youtu.be/we6poP0kw6E
REFERENCES 65 BUILD A RESPONSIVE UI WITH CONSTRAINTLAYOUT developer.android.com/training/constraint-layout/index.html ANDROID
DEVELOPERS BACKSTAGE: EPISODE 50: CONSTRAINT LAYOUT androidbackstage.blogspot.com/2016/06/episode-50-constraint-layout.html CUSTOM VIEWGROUPS https://sriramramani.wordpress.com/2015/05/06/custom-viewgroups/ MEASURE, LAYOUT, DRAW, REPEAT: CUSTOM VIEWS AND VIEWGROUPS https://youtu.be/dLl0ovmta6A