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
480
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
250
Gradleの実行環境設定を見直す
e10dokup
0
850
Firebase App Distributionのテストアプリ配信を試しやすくする
e10dokup
0
560
アプリに署名する 〜GitHub ActionsでのCIも見据えて〜
e10dokup
0
1.1k
Profileable buildでより正確なパフォーマンスを掴む
e10dokup
0
710
[DroidKaigi 2021] メディアアクセス古今東西 / Now and Future of Media Access
e10dokup
0
3.4k
今更「dp」を考える / Let's think about "dp" now
e10dokup
0
5.5k
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
3.1k
Guide to background processingを読んでみる / Reading "Guide to background processing"
e10dokup
0
250
Other Decks in Programming
See All in Programming
Flutter × Firebase Genkit で加速する生成 AI アプリ開発
coborinai
0
160
Software Architecture
hschwentner
6
2.1k
How mixi2 Uses TiDB for SNS Scalability and Performance
kanmo
36
14k
dbt Pythonモデルで実現するSnowflake活用術
trsnium
0
120
パスキーのすべて ── 導入・UX設計・実装の紹介 / 20250213 パスキー開発者の集い
kuralab
3
780
昭和の職場からアジャイルの世界へ
kumagoro95
1
370
WebDriver BiDiとは何なのか
yotahada3
1
140
ペアーズでの、Langfuseを中心とした評価ドリブンなリリースサイクルのご紹介
fukubaka0825
2
320
社内フレームワークとその依存性解決 / in-house framework and its dependency management
vvakame
1
560
ソフトウェアエンジニアの成長
masuda220
PRO
10
1.1k
2024年のkintone API振り返りと2025年 / kintone API look back in 2024
tasshi
0
220
Multi Step Form, Decentralized Autonomous Organization
pumpkiinbell
1
730
Featured
See All Featured
Building Better People: How to give real-time feedback that sticks.
wjessup
367
19k
Being A Developer After 40
akosma
89
590k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
193
16k
Building Flexible Design Systems
yeseniaperezcruz
328
38k
A Modern Web Designer's Workflow
chriscoyier
693
190k
Java REST API Framework Comparison - PWX 2021
mraible
28
8.4k
Rails Girls Zürich Keynote
gr2m
94
13k
Music & Morning Musume
bryan
46
6.3k
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
eileencodes
133
33k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
3.7k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
27
1.6k
For a Future-Friendly Web
brad_frost
176
9.5k
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: