Changes for R8 Configuration analyzer example

app/build.gradle.kts

@@ -56,6 +56,15 @@ android {
             // Ensure Baseline Profile is fresh for release builds.
             baselineProfile.automaticGenerationDuringBuild = true
         }
+
+        create("benchmark") {
+            initWith(getByName("release"))
+            matchingFallbacks += listOf("release")
+            applicationIdSuffix = NiaBuildType.BENCHMARK.applicationIdSuffix
+            isMinifyEnabled = true
+            isShrinkResources = true
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+        }
     }
 
     packaging {
@@ -79,6 +88,7 @@ dependencies {
     implementation(projects.feature.search.api)
     implementation(projects.feature.search.impl)
     implementation(projects.feature.settings.impl)
+    implementation(projects.mylibrary)
 
     implementation(projects.core.common)
     implementation(projects.core.ui)

app/src/main/kotlin/com/google/samples/apps/nowinandroid/NiaApplication.kt

@@ -17,6 +17,7 @@
 package com.google.samples.apps.nowinandroid
 
 import android.app.Application
+import android.content.ComponentCallbacks2
 import android.content.pm.ApplicationInfo
 import android.os.StrictMode
 import android.os.StrictMode.ThreadPolicy.Builder
@@ -26,12 +27,21 @@ import com.google.samples.apps.nowinandroid.sync.initializers.Sync
 import com.google.samples.apps.nowinandroid.util.ProfileVerifierLogger
 import dagger.hilt.android.HiltAndroidApp
 import javax.inject.Inject
+import com.example.mylibrary.StartupTask
+import com.example.mylibrary.TaskRunner
+import android.util.Log
+
+class NiaStartupTask : StartupTask {
+    override fun run() {
+        Log.d("NiaStartupTask", "Running startup task from mylibrary")
+    }
+}
 
 /**
  * [Application] class for NiA
  */
 @HiltAndroidApp
-class NiaApplication : Application(), ImageLoaderFactory {
+class NiaApplication : Application(), ImageLoaderFactory, ComponentCallbacks2 {
     @Inject
     lateinit var imageLoader: dagger.Lazy<ImageLoader>
 
@@ -41,11 +51,10 @@ class NiaApplication : Application(), ImageLoaderFactory {
     override fun onCreate() {
         super.onCreate()
 
-        setStrictModePolicy()
-
         // Initialize Sync; the system responsible for keeping data in the app up to date.
         Sync.initialize(context = this)
         profileVerifierLogger()
+        TaskRunner.execute(NiaStartupTask::class.java)
     }
 
     override fun newImageLoader(): ImageLoader = imageLoader.get()
@@ -57,6 +66,27 @@ class NiaApplication : Application(), ImageLoaderFactory {
         return 0 != applicationInfo.flags and ApplicationInfo.FLAG_DEBUGGABLE
     }
 
+    override fun onTrimMemory(level: Int) {
+        super<Application>.onTrimMemory(level)
+        // 1. Explicitly clear or trim our ImageLoader's memory cache
+        // (Note: Coil automatically listens to ComponentCallbacks2, but this serves as a good 
+        // example of how to manually trim caches based on system memory signals).
+        if (level == TRIM_MEMORY_UI_HIDDEN){
+            // The user has navigated away from the app and the UI is no longer visible.
+            // This is a good place to release large UI-related resources that you
+            // won't need while in the background
+            imageLoader.get().memoryCache?.trimMemory(level)
+        }
+
+        if(level == TRIM_MEMORY_BACKGROUND) {
+            // The app is in the background and the system is running low on memory.
+            // As the level increases to COMPLETE, the likelihood of the app process
+            // being killed increases. Aggressively clear caches here.
+            imageLoader.get().memoryCache?.clear()
+        }
+
+    }
+
     /**
      * Set a thread policy that detects all potential problems on the main thread, such as network
      * and disk access.

build-logic/convention/src/main/kotlin/com/google/samples/apps/nowinandroid/NiaBuildType.kt

@@ -22,4 +22,5 @@ package com.google.samples.apps.nowinandroid
 enum class NiaBuildType(val applicationIdSuffix: String? = null) {
     DEBUG(".debug"),
     RELEASE,
+    BENCHMARK(".benchmark")
 }

core/network/src/main/kotlin/com/google/samples/apps/nowinandroid/core/network/di/NetworkModule.kt

@@ -81,7 +81,11 @@ internal object NetworkModule {
     ): ImageLoader = trace("NiaImageLoader") {
         ImageLoader.Builder(application)
             .callFactory { okHttpCallFactory.get() }
-            .components { add(SvgDecoder.Factory()) }
+            .memoryCache(null)      // ❌ Bug 1: Memory cache disabled
+            .diskCache(null)
+            // ❌ Bug 2: Disk cache disabled
+            .allowHardware(false)   // ❌ Bug 3: Forces bitmaps onto Java heap
+            .bitmapConfig(android.graphics.Bitmap.Config.ARGB_8888)
             // Assume most content images are versioned urls
             // but some problematic images are fetching each time
             .respectCacheHeaders(false)

core/ui/src/main/kotlin/com/google/samples/apps/nowinandroid/core/ui/NewsResourceCard.kt

@@ -17,6 +17,7 @@
 package com.google.samples.apps.nowinandroid.core.ui
 
 import android.content.ClipData
+import android.graphics.Bitmap
 import android.os.Build.VERSION
 import android.os.Build.VERSION_CODES
 import android.view.View
@@ -53,7 +54,10 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draganddrop.DragAndDropTransferData
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.graphics.painter.BitmapPainter
 import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalInspectionMode
 import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.res.painterResource
@@ -64,6 +68,7 @@ import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.tooling.preview.PreviewParameter
 import androidx.compose.ui.unit.dp
+import androidx.core.content.ContextCompat
 import coil.compose.AsyncImagePainter
 import coil.compose.rememberAsyncImagePainter
 import com.google.samples.apps.nowinandroid.core.designsystem.R.drawable
@@ -189,10 +194,29 @@ fun NewsResourceHeaderImage(
         },
     )
     val isLocalInspection = LocalInspectionMode.current
+
+    val context = LocalContext.current
+
+    val perRowBitmap = remember {
+        Bitmap.createBitmap(
+            2000, 2000, Bitmap.Config.ARGB_8888
+        ).apply {
+            val canvas = android.graphics.Canvas(this)
+
+            // Now you can use 'context' here to load the drawable
+            val drawable = ContextCompat.getDrawable(
+                context,
+                drawable.core_designsystem_ic_placeholder_default
+            )
+
+            drawable?.setBounds(0, 0, width, height)
+            drawable?.draw(canvas)
+        }.asImageBitmap()
+    }
     Box(
         modifier = Modifier
             .fillMaxWidth()
-            .height(180.dp),
+            .height(320.dp),
         contentAlignment = Alignment.Center,
     ) {
         if (isLoading) {
@@ -205,15 +229,16 @@ fun NewsResourceHeaderImage(
             )
         }
 
+
         Image(
             modifier = Modifier
                 .fillMaxWidth()
-                .height(180.dp),
+                .height(320.dp),
             contentScale = ContentScale.Crop,
             painter = if (isError.not() && !isLocalInspection) {
                 imageLoader
             } else {
-                painterResource(drawable.core_designsystem_ic_placeholder_default)
+                BitmapPainter(perRowBitmap)
             },
             // TODO b/226661685: Investigate using alt text of  image to populate content description
             // decorative image,

mylibrary/build.gradle.kts

@@ -0,0 +1,37 @@
+plugins {
+    alias(libs.plugins.android.library)
+}
+
+android {
+    namespace = "com.example.mylibrary"
+    compileSdk = 36
+
+    defaultConfig {
+        minSdk = 21
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles("consumer-rules.pro")
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = true
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
+    }
+}
+
+dependencies {
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.appcompat)
+    testImplementation(libs.junit)
+    androidTestImplementation(libs.androidx.test.ext)
+    androidTestImplementation(libs.androidx.test.espresso.core)
+}

mylibrary/consumer-rules.pro

@@ -0,0 +1,12 @@
+
+# Declare that the default constructor is called reflectively.
+-keep class * implements com.example.mylibrary.StartupTask {  <init>(); }
+
+-keep class  * {
+        public *;
+    }
+
+
+
+-dontwarn com.example.mylibrary.StartupTask
+-dontwarn com.example.mylibrary.TaskRunner

mylibrary/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

mylibrary/src/androidTest/java/com/example/mylibrary/ExampleInstrumentedTest.kt

@@ -0,0 +1,24 @@
+package com.example.mylibrary
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.example.mylibrary.test", appContext.packageName)
+    }
+}

mylibrary/src/main/AndroidManifest.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+</manifest>

mylibrary/src/main/java/com/example/mylibrary/MyLibrary.kt

@@ -0,0 +1,17 @@
+
+
+package com.example.mylibrary
+
+interface StartupTask {
+    fun run()
+}
+
+// The library object that loads and executes the task.
+object TaskRunner {
+    fun execute(taskClassFromApp: Class<out StartupTask>) {
+        // R8 will remove the class specified by this string.
+        val taskClassInstance =
+            taskClassFromApp.getDeclaredConstructor().newInstance() as StartupTask
+        taskClassInstance.run()
+    }
+}

mylibrary/src/test/java/com/example/mylibrary/ExampleUnitTest.kt

@@ -0,0 +1,17 @@
+package com.example.mylibrary
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}

settings.gradle.kts

@@ -15,6 +15,17 @@
  */
 
 pluginManagement {
+    buildscript {
+        repositories {
+            mavenCentral()
+            maven {
+                url = uri("https://storage.googleapis.com/r8-releases/raw")
+            }
+        }
+        dependencies {
+            classpath("com.android.tools:r8:9.3.7-dev")
+        }
+    }
     includeBuild("build-logic")
     repositories {
         google {
@@ -81,6 +92,7 @@ include(":lint")
 include(":sync:work")
 include(":sync:sync-test")
 include(":ui-test-hilt-manifest")
+include(":mylibrary")
 
 check(JavaVersion.current().isCompatibleWith(JavaVersion.VERSION_17)) {
     """