Update images in Jetsnack example: host them locally and use Resources library (#5131)

We used to rely on an external service to fetch the images. But they are
not available anymore

examples/jetsnack/android/src/main/AndroidManifest.xml

@@ -7,7 +7,7 @@
             android:allowBackup="false"
             android:supportsRtl="true"
             android:theme="@style/Theme.AppCompat.Light.NoActionBar">
-        <activity android:name=".MainActivity" android:exported="true">
+        <activity android:name="com.example.android.MainActivity" android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>

examples/jetsnack/common/build.gradle.kts

@@ -39,6 +39,7 @@ kotlin {
                 api(compose.runtime)
                 api(compose.foundation)
                 api(compose.material)
+                implementation(compose.components.resources)
                 implementation(libs.kotlinx.coroutines)
             }
         }

examples/jetsnack/common/src/androidMain/kotlin/com/example/jetsnack/ui/components/SnackAsyncImage.kt

@@ -1,25 +1,69 @@
 package com.example.jetsnack.ui.components
 
-import androidx.compose.foundation.layout.fillMaxSize
+import android.annotation.SuppressLint
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import androidx.compose.animation.AnimatedContent
+import androidx.compose.animation.ExperimentalAnimationApi
+import androidx.compose.animation.core.TweenSpec
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.with
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.layout.Box
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.ImageBitmap
+import androidx.compose.ui.graphics.asImageBitmap
 import androidx.compose.ui.layout.ContentScale
-import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.res.painterResource
-import coil.compose.AsyncImage
-import coil.request.ImageRequest
-import com.example.jetsnack.R
+import com.example.common.generated.resources.Res
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import org.jetbrains.compose.resources.ExperimentalResourceApi
 
+private val imagesCache = mutableMapOf<String, ImageBitmap>()
+
+@SuppressLint("UnusedContentLambdaTargetStateParameter")
+@OptIn(ExperimentalAnimationApi::class, ExperimentalResourceApi::class)
 @Composable
 actual fun SnackAsyncImage(imageUrl: String, contentDescription: String?, modifier: Modifier) {
-    AsyncImage(
-        model = ImageRequest.Builder(LocalContext.current)
-            .data(imageUrl)
-            .crossfade(true)
-            .build(),
-        contentDescription = contentDescription,
-        placeholder = painterResource(R.drawable.placeholder),
-        modifier = Modifier.fillMaxSize(),
-        contentScale = ContentScale.Crop,
-    )
+    var img: ImageBitmap? by remember(imageUrl) { mutableStateOf(null) }
+
+
+    AnimatedContent(img, transitionSpec = {
+        fadeIn(TweenSpec()) with fadeOut(TweenSpec())
+    }) {
+        if (img != null) {
+            Image(img!!, contentDescription = contentDescription, modifier = modifier, contentScale = ContentScale.Crop)
+        } else {
+            Box(modifier = modifier)
+        }
+    }
+
+    LaunchedEffect(imageUrl) {
+        if (imagesCache.contains(imageUrl)) {
+            img = imagesCache[imageUrl]
+        } else {
+            withContext(Dispatchers.IO) {
+                img = try {
+                    Res.readBytes(imageUrl).toAndroidBitmap().asImageBitmap().also {
+                        imagesCache[imageUrl] = it
+                        img = it
+                    }
+                } catch (e: Throwable) {
+                    e.printStackTrace()
+                    null
+                }
+            }
+        }
+    }
+}
+
+fun ByteArray.toAndroidBitmap(): Bitmap {
+    return BitmapFactory.decodeByteArray(this, 0, size)
 }

examples/jetsnack/common/src/commonMain/kotlin/com/example/jetsnack/model/Search.kt

@@ -65,19 +65,19 @@ private val searchCategoryCollections = listOf(
         categories = listOf(
             SearchCategory(
                 name = "Chips & crackers",
-                imageUrl = "https://source.unsplash.com/UsSdMZ78Q3E"
+                imageUrl = "files/chips.jpg"
             ),
             SearchCategory(
                 name = "Fruit snacks",
-                imageUrl = "https://source.unsplash.com/SfP1PtM9Qa8"
+                imageUrl = "files/fruit.jpg"
             ),
             SearchCategory(
                 name = "Desserts",
-                imageUrl = "https://source.unsplash.com/_jk8KIyN_uA"
+                imageUrl = "files/desserts.jpg"
             ),
             SearchCategory(
                 name = "Nuts ",
-                imageUrl = "https://source.unsplash.com/UsSdMZ78Q3E"
+                imageUrl = "files/nuts.jpg"
             )
         )
     ),
@@ -87,27 +87,27 @@ private val searchCategoryCollections = listOf(
         categories = listOf(
             SearchCategory(
                 name = "Organic",
-                imageUrl = "https://source.unsplash.com/7meCnGCJ5Ms"
+                imageUrl = "files/organic.jpg"
             ),
             SearchCategory(
                 name = "Gluten Free",
-                imageUrl = "https://source.unsplash.com/m741tj4Cz7M"
+                imageUrl = "files/gluten_free.jpg"
             ),
             SearchCategory(
                 name = "Paleo",
-                imageUrl = "https://source.unsplash.com/dt5-8tThZKg"
+                imageUrl = "files/paleo.jpg"
             ),
             SearchCategory(
                 name = "Vegan",
-                imageUrl = "https://source.unsplash.com/ReXxkS1m1H0"
+                imageUrl = "files/vegan.jpg"
             ),
             SearchCategory(
                 name = "Vegitarian",
-                imageUrl = "https://source.unsplash.com/IGfIGP5ONV0"
+                imageUrl = "files/grapes.jpg"
             ),
             SearchCategory(
                 name = "Whole30",
-                imageUrl = "https://source.unsplash.com/9MzCd76xLGk"
+                imageUrl = "files/popcorn.jpg"
             )
         )
     )

examples/jetsnack/common/src/commonMain/kotlin/com/example/jetsnack/model/Snack.kt

@@ -17,6 +17,7 @@
 package com.example.jetsnack.model
 
 import androidx.compose.runtime.Immutable
+import com.example.common.generated.resources.Res
 
 @Immutable
 data class Snack(
@@ -37,190 +38,190 @@ val snacks = listOf(
         id = 1L,
         name = "Cupcake",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/pGM4sjt_BdQ",
+        imageUrl = "files/cupcake.jpg",
         price = 299
     ),
     Snack(
         id = 2L,
         name = "Donut",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/Yc5sL-ejk6U",
+        imageUrl = "files/donut.jpg",
         price = 290
     ),
     Snack(
         id = 3L,
         name = "Eclair",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/-LojFX9NfPY",
+        imageUrl = "files/eclair.jpg",
         price = 289
     ),
     Snack(
         id = 4L,
         name = "Froyo",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/3U2V5WqK1PQ",
+        imageUrl = "files/froyo.jpg",
         price = 288
     ),
     Snack(
         id = 5L,
         name = "Gingerbread",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/Y4YR9OjdIMk",
+        imageUrl = "files/gingerbread.jpg",
         price = 499
     ),
     Snack(
         id = 6L,
         name = "Honeycomb",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/bELvIg_KZGU",
+        imageUrl = "files/honeycomb.jpg",
         price = 309
     ),
     Snack(
         id = 7L,
         name = "Ice Cream Sandwich",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/YgYJsFDd4AU",
+        imageUrl = "files/ice_cream_sandwich.jpg",
         price = 1299
     ),
     Snack(
         id = 8L,
         name = "Jellybean",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/0u_vbeOkMpk",
+        imageUrl = "files/jelly_bean.jpg",
         price = 109
     ),
     Snack(
         id = 9L,
         name = "KitKat",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/yb16pT5F_jE",
+        imageUrl = "files/kitkat.jpg",
         price = 549
     ),
     Snack(
         id = 10L,
         name = "Lollipop",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/AHF_ZktTL6Q",
+        imageUrl = "files/lollipop.jpg",
         price = 209
     ),
     Snack(
         id = 11L,
         name = "Marshmallow",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/rqFm0IgMVYY",
+        imageUrl = "files/marshmallow.jpg",
         price = 219
     ),
     Snack(
         id = 12L,
         name = "Nougat",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/qRE_OpbVPR8",
+        imageUrl = "files/nougat.jpg",
         price = 309
     ),
     Snack(
         id = 13L,
         name = "Oreo",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/33fWPnyN6tU",
+        imageUrl = "files/oreo.jpg",
         price = 339
     ),
     Snack(
         id = 14L,
         name = "Pie",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/aX_ljOOyWJY",
+        imageUrl = "files/pie.jpg",
         price = 249
     ),
     Snack(
         id = 15L,
         name = "Chips",
-        imageUrl = "https://source.unsplash.com/UsSdMZ78Q3E",
+        imageUrl = "files/chips.jpg",
         price = 277
     ),
     Snack(
         id = 16L,
         name = "Pretzels",
-        imageUrl = "https://source.unsplash.com/7meCnGCJ5Ms",
+        imageUrl = "files/pretzels.jpg",
         price = 154
     ),
     Snack(
         id = 17L,
         name = "Smoothies",
-        imageUrl = "https://source.unsplash.com/m741tj4Cz7M",
+        imageUrl = "files/smoothies.jpg",
         price = 257
     ),
     Snack(
         id = 18L,
         name = "Popcorn",
-        imageUrl = "https://source.unsplash.com/iuwMdNq0-s4",
+        imageUrl = "files/popcorn.jpg",
         price = 167
     ),
     Snack(
         id = 19L,
         name = "Almonds",
-        imageUrl = "https://source.unsplash.com/qgWWQU1SzqM",
+        imageUrl = "files/almonds.jpg",
         price = 123
     ),
     Snack(
         id = 20L,
         name = "Cheese",
-        imageUrl = "https://source.unsplash.com/9MzCd76xLGk",
+        imageUrl = "files/cheese.jpg",
         price = 231
     ),
     Snack(
         id = 21L,
         name = "Apples",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/1d9xXWMtQzQ",
+        imageUrl = "files/apples.jpg",
         price = 221
     ),
     Snack(
         id = 22L,
         name = "Apple sauce",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/wZxpOw84QTU",
+        imageUrl = "files/apple_sauce.jpg",
         price = 222
     ),
     Snack(
         id = 23L,
         name = "Apple chips",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/okzeRxm_GPo",
+        imageUrl = "files/apple_chips.jpg",
         price = 231
     ),
     Snack(
         id = 24L,
         name = "Apple juice",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/l7imGdupuhU",
+        imageUrl = "files/apple_juice.jpg",
         price = 241
     ),
     Snack(
         id = 25L,
         name = "Apple pie",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/bkXzABDt08Q",
+        imageUrl = "files/apple_pie.jpg",
         price = 225
     ),
     Snack(
         id = 26L,
         name = "Grapes",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/y2MeW00BdBo",
+        imageUrl = "files/grapes.jpg",
         price = 266
     ),
     Snack(
         id = 27L,
         name = "Kiwi",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/1oMGgHn-M8k",
+        imageUrl = "files/kiwi.jpg",
         price = 127
     ),
     Snack(
         id = 28L,
         name = "Mango",
         tagline = "A tag line",
-        imageUrl = "https://source.unsplash.com/TIGDsyy0TK4",
+        imageUrl = "files/mango.jpg",
         price = 128
     )
 )

examples/jetsnack/common/src/desktopMain/kotlin/com/example/jetsnack/ui/components/SnackAsyncImage.kt

@@ -9,15 +9,17 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.ui.graphics.toComposeImageBitmap
 import androidx.compose.ui.layout.ContentScale
+import com.example.common.generated.resources.Res
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
+import org.jetbrains.compose.resources.ExperimentalResourceApi
 import java.net.URL
 import javax.imageio.ImageIO
 
 
 private val imagesCache = mutableMapOf<String, ImageBitmap>()
 
-@OptIn(ExperimentalAnimationApi::class)
+@OptIn(ExperimentalAnimationApi::class, ExperimentalResourceApi::class)
 @Composable
 actual fun SnackAsyncImage(imageUrl: String, contentDescription: String?, modifier: Modifier) {
     var img: ImageBitmap? by remember(imageUrl) { mutableStateOf(null) }
@@ -39,7 +41,7 @@ actual fun SnackAsyncImage(imageUrl: String, contentDescription: String?, modifi
         } else {
             withContext(Dispatchers.IO) {
                 img = try {
-                    ImageIO.read(URL(imageUrl)).toComposeImageBitmap().also {
+                    org.jetbrains.skia.Image.makeFromEncoded(Res.readBytes(imageUrl)).toComposeImageBitmap().also {
                         imagesCache[imageUrl] = it
                         img = it
                     }

examples/jetsnack/common/src/iosMain/kotlin/com/example/jetsnack/ui/components/SnackAsyncImage.ios.kt

@@ -9,10 +9,12 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.ui.graphics.toComposeImageBitmap
 import androidx.compose.ui.layout.ContentScale
+import com.example.common.generated.resources.Res
 import kotlinx.cinterop.ExperimentalForeignApi
 import kotlinx.cinterop.addressOf
 import kotlinx.cinterop.usePinned
 import kotlinx.coroutines.*
+import org.jetbrains.compose.resources.ExperimentalResourceApi
 import org.jetbrains.skia.Image
 import platform.Foundation.*
 import platform.posix.memcpy
@@ -21,7 +23,7 @@ import kotlin.coroutines.resumeWithException
 
 private val imagesCache = mutableMapOf<String, ImageBitmap>()
 
-@OptIn(ExperimentalAnimationApi::class)
+@OptIn(ExperimentalAnimationApi::class, ExperimentalResourceApi::class)
 @Composable
 actual fun SnackAsyncImage(imageUrl: String, contentDescription: String?, modifier: Modifier) {
     var img: ImageBitmap? by remember(imageUrl) { mutableStateOf(null) }
@@ -43,7 +45,7 @@ actual fun SnackAsyncImage(imageUrl: String, contentDescription: String?, modifi
         } else {
             withContext(Dispatchers.IO) {
                 img = try {
-                    loadImage(imageUrl).also {
+                    Image.makeFromEncoded(Res.readBytes(imageUrl)).toComposeImageBitmap().also {
                         imagesCache[imageUrl] = it
                         img = it
                     }
@@ -54,33 +56,4 @@ actual fun SnackAsyncImage(imageUrl: String, contentDescription: String?, modifi
             }
         }
     }
-}
-
-@OptIn(ExperimentalForeignApi::class)
-suspend fun loadImage(url: String): ImageBitmap = suspendCancellableCoroutine { continuation ->
-    val nsUrl = NSURL(string = url)
-    val task = NSURLSession.sharedSession.dataTaskWithURL(nsUrl) { data, response, error ->
-        if (data != null) {
-            val byteArray = ByteArray(data.length.toInt()).apply {
-                usePinned {
-                    memcpy(
-                        it.addressOf(0),
-                        data.bytes,
-                        data.length
-                    )
-                }
-            }
-
-            continuation.resume(Image.makeFromEncoded(byteArray).toComposeImageBitmap())
-        } else {
-            error?.let {
-                continuation.resumeWithException(Exception(it.localizedDescription))
-            }
-        }
-    }
-
-    task.resume()
-    continuation.invokeOnCancellation {
-        task.cancel()
-    }
 }

examples/jetsnack/common/src/wasmJsMain/kotlin/com/example/jetsnack/ui/components/SnackAsyncImage.kt

@@ -6,11 +6,14 @@ import androidx.compose.foundation.Image
 import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.ui.graphics.toComposeImageBitmap
 import androidx.compose.ui.layout.ContentScale
+import com.example.common.generated.resources.Res
 import kotlinx.coroutines.*
 import com.example.jetsnack.model.snacks
+import org.jetbrains.compose.resources.ExperimentalResourceApi
 
 val imagesCache = mutableMapOf<String, ImageBitmap>()
 
+@OptIn(ExperimentalResourceApi::class)
 @Composable
 actual fun SnackAsyncImage(
     imageUrl: String,
@@ -28,21 +31,22 @@ actual fun SnackAsyncImage(
         if (imagesCache.contains(imageUrl)) {
             bitmap = imagesCache[imageUrl]!!
         } else {
-            val arrayBuffer = loadImage(imageUrl)
-            val skiaImg = org.jetbrains.skia.Image.makeFromEncoded(arrayBuffer.toByteArray())
-            imagesCache[imageUrl] = skiaImg.toComposeImageBitmap()
+            imagesCache[imageUrl] = org.jetbrains.skia.Image.makeFromEncoded(
+                Res.readBytes(imageUrl)
+            ).toComposeImageBitmap()
             bitmap = imagesCache[imageUrl]
         }
     }
 }
+@OptIn(ExperimentalResourceApi::class)
 suspend fun CoroutineScope.prepareImagesCache() {
     val jobs = mutableListOf<Job>()
     // We have not many images, so we can prepare and cache them upfront
     snacks.forEach {
         val j = launch {
-            val arrayBuffer = loadImage(it.imageUrl)
-            val skiaImg = org.jetbrains.skia.Image.makeFromEncoded(arrayBuffer.toByteArray())
-            imagesCache[it.imageUrl] = skiaImg.toComposeImageBitmap()
+            imagesCache[it.imageUrl] = org.jetbrains.skia.Image.makeFromEncoded(
+                Res.readBytes(it.imageUrl)
+            ).toComposeImageBitmap()
         }
         jobs.add(j)
     }

examples/jetsnack/web/src/wasmJsMain/kotlin/Main.kt

@@ -13,6 +13,8 @@ import com.example.jetsnack.ui.components.loadImage
 import com.example.jetsnack.ui.components.toByteArray
 import com.example.jetsnack.ui.theme.Karla
 import com.example.jetsnack.ui.theme.Montserrat
+import kotlinx.coroutines.joinAll
+import kotlinx.coroutines.launch
 import org.jetbrains.compose.resources.*
 
 @OptIn(ExperimentalComposeUiApi::class, ExperimentalResourceApi::class)
@@ -31,9 +33,16 @@ fun main() {
         }
 
         LaunchedEffect(Unit) {
-            loadMontserratFont()
-            loadKarlaFont()
-            prepareImagesCache()
+            val j1 = launch {
+                loadMontserratFont()
+            }
+            val j2 = launch {
+                loadKarlaFont()
+            }
+            val j3 = launch {
+                prepareImagesCache()
+            }
+            joinAll(j1, j2, j3)
             loading = false
         }
     }