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
よしなに頑張る画像ロードの話 / image load mettya tsurai
Search
Yoshihiro WADA
June 18, 2019
Programming
2
510
よしなに頑張る画像ロードの話 / image load mettya tsurai
2019/06/18に開催されたPotatotips #62にて発表したスライドです
Yoshihiro WADA
June 18, 2019
Tweet
Share
More Decks by Yoshihiro WADA
See All by Yoshihiro WADA
AndroidデバイスにFTPサーバを建立する
e10dokup
0
420
Gradleの実行環境設定を見直す
e10dokup
0
1k
Firebase App Distributionのテストアプリ配信を試しやすくする
e10dokup
0
630
アプリに署名する 〜GitHub ActionsでのCIも見据えて〜
e10dokup
0
1.2k
Profileable buildでより正確なパフォーマンスを掴む
e10dokup
0
740
[DroidKaigi 2021] メディアアクセス古今東西 / Now and Future of Media Access
e10dokup
0
3.7k
今更「dp」を考える / Let's think about "dp" now
e10dokup
0
5.7k
1から学ぶAndroidアプリデバッグ - アプリの動作を追いかけよう / Learn Android application debugging from the scratch - track apps' behaviors
e10dokup
10
3.3k
Guide to background processingを読んでみる / Reading "Guide to background processing"
e10dokup
0
260
Other Decks in Programming
See All in Programming
AI コーディングエージェントの時代へ:JetBrains が描く開発の未来
masaruhr
1
190
Team operations that are not burdened by SRE
kazatohiei
1
320
Composerが「依存解決」のためにどんな工夫をしているか #phpcon
o0h
PRO
1
280
Hack Claude Code with Claude Code
choplin
5
2.3k
GitHub Copilot and GitHub Codespaces Hands-on
ymd65536
2
150
XP, Testing and ninja testing
m_seki
3
250
テストから始めるAgentic Coding 〜Claude Codeと共に行うTDD〜 / Agentic Coding starts with testing
rkaga
13
4.9k
Agentic Coding: The Future of Software Development with Agents
mitsuhiko
0
110
Python型ヒント完全ガイド 初心者でも分かる、現代的で実践的な使い方
mickey_kubo
1
140
“いい感じ“な定量評価を求めて - Four Keysとアウトカムの間の探求 -
nealle
2
11k
Quand Symfony, ApiPlatform, OpenAI et LangChain s'allient pour exploiter vos PDF : de la théorie à la production…
ahmedbhs123
0
210
10 Costly Database Performance Mistakes (And How To Fix Them)
andyatkinson
0
440
Featured
See All Featured
Large-scale JavaScript Application Architecture
addyosmani
512
110k
Building a Modern Day E-commerce SEO Strategy
aleyda
42
7.4k
Mobile First: as difficult as doing things right
swwweet
223
9.7k
What’s in a name? Adding method to the madness
productmarketing
PRO
23
3.5k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
29
1.8k
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
233
17k
Intergalactic Javascript Robots from Outer Space
tanoku
271
27k
Why Our Code Smells
bkeepers
PRO
336
57k
Practical Tips for Bootstrapping Information Extraction Pipelines
honnibal
PRO
20
1.3k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
30
2.1k
VelocityConf: Rendering Performance Case Studies
addyosmani
332
24k
Build The Right Thing And Hit Your Dates
maggiecrowley
36
2.8k
Transcript
Yoshihiro Wada a.k.a. @e10dokup Potatotips #62 - 2019/06/18
Yoshihiro Wada a.k.a. @e10dokup CyberAgant Inc. / Ameba Ameba
None
1 URL 2 3 3.5
bumptech/glide square/picasso Image Loading Library bumptech/glide 4.9.0 ConstraintLayout
1 URL
GlideApp.with(this) .load(/* Image URL */) .placeholder(/* Placeholder Drawable */) .error(/*
Error Drawable */) .into(/* Target ImageView */)
2
ConstraintLayout XML ImageView <ImageView android:id=“@+id/image_view” android:layout_width="0dp" android:layout_height=“0dp” app:layout_constraintDimensionRatio="H,3:2" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent"
app:layout_constraintEnd_toEndOf=“parent" />
centerCrop GlideApp.with(this) .load(/* Image URL */) .placeholder(/* Placeholder Drawable */)
.error(/* Error Drawable */) .centerCrop() .into(/* Target ImageView */)
XML BindingAdapter <ImageView android:id=“@+id/image_view” android:layout_width="0dp" android:layout_height=“0dp” app:layout_constraintDimensionRatio="H,3:2" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintEnd_toEndOf=“parent”
app:url=“@{imageUrl}” />
BindingAdapter BindingAdapter @BindingAdapter(“url") internal fun ImageView.loadImage(url: String?) { if (url
== null) { setImageDrawable(null) return } GlideApp .with(this) .load(url) .centerCrop() .into(this) }
3
DimensionRatio
API URL BindingAdapter DimensionRatio 3 <ImageView android:id=“@+id/image_view” android:layout_width="0dp" android:layout_height=“0dp” app:width=“@{imageWidth}”
app:height=“@{imageHeight}” app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintEnd_toEndOf=“parent” app:url=“@{imageUrl}” />
width/height dimensionRatio BindingAdapter layout_constraintDimensionRatio ConstraintLayout BindingAdapter 3 @BindingAdapter(“width”, “height”) internal
fun ImageView.setAspectRatio(width: Int, height: Int) { (layoutParams as ConstraintLayout.LayoutParams).dimensionRatio = “h,${width}:${height}” }
glide RequestListener Drawable requestLayout() onMeasure() 3.5
3.5 override fun onResourceReady( resource: Drawable?, model: Any?, target: Target<Drawable>?,
dataSource: DataSource?, isFirstResource: Boolean ): Boolean { resource ?: return false val width = resource.intrinsicWidth.toFloat() val height = resource.intrinsicHeight.toFloat() aspectRatio = width / height requestLayout() return false }
3.5 override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) { aspectRatio?.let {
// ݱঢ়ͷԣ෯Λऔಘ͠ɺ৽نʹΞεϖΫτൺΛөͨ͠αΠζʹΓସ͑Δ val width = MeasureSpec.getSize(widthMeasureSpec) val w = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY) val h = MeasureSpec .makeMeasureSpec((width / it).toInt(), MeasureSpec.EXACTLY) super.onMeasure(w, h) return } super.onMeasure(widthMeasureSpec, heightMeasureSpec) }
4
*NBHF7JFX *NBHF7JFX *NBHF7JFX
Load Bitmap Glide CenterCrop() Transformation Transformation 4:2 2 ->
-> Transformation
• override fun updateDiskCacheKey(messageDigest: MessageDigest) equals() / hashCode() • override
fun transform( pool: BitmapPool, toTransform: Bitmap, outWidth: Int, outHeight: Int ): Bitmap toTransform Bitmap BitmapTransformation
override fun transform( pool: BitmapPool, toTransform: Bitmap, outWidth: Int, outHeight:
Int ): Bitmap { val width = toTransform.width val height = toTransform.height aspectRatio = width / height return when { aspectRatio >= 2 -> // 2:5 ΑΓԣ cropWidth(pool, toTransform, imageWidth, imageHeight) else -> // ͦΕҎ֎ͷͱ͖ɺͦͷ··BitmapΛฦ٫ toTransform } }
private fun transform( pool: BitmapPool, toTransform: Bitmap, width: Int, height:
Int ): Bitmap { val croppedWidth = (width * 0.5).toInt() return TransformationUtils.centerCrop( pool, toTransform, trimmedWidth, height ) }
None
:pray: