add thumbnails to the books example to make memory leaks easier to test

add_to_app/books/android_books/app/build.gradle

@@ -20,6 +20,7 @@ android {
         release {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+            signingConfig debug.signingConfig
         }
     }
     compileOptions {

add_to_app/books/android_books/app/src/main/java/dev/flutter/example/books/MainActivity.kt

@@ -94,6 +94,9 @@ class MainActivity : AppCompatActivity() {
                 book.summary = volumeInfoJson.get("description").asString
                 book.publishDate = volumeInfoJson.get("publishedDate").asString
                 book.pageCount = volumeInfoJson.get("pageCount").asLong
+                val thumbnail = Api.Thumbnail()
+                thumbnail.url = volumeInfoJson.getAsJsonObject("imageLinks").get("thumbnail").asString
+                book.thumbnail = thumbnail
                 books.add(book)
             } catch (e: Exception) {
                 println("Failed to parse book:")

add_to_app/books/flutter_module_books/lib/main.dart

@@ -96,6 +96,9 @@ class _BookDetailState extends State<BookDetail> {
     }));
   }
 
+  // Not overriding didUpdateWidget because the Android program can't change
+  // the book given to Flutter on the Android side.
+
   void clear() {
     book = null;
     // Keep focus if going to the home screen but unfocus if leaving
@@ -209,21 +212,29 @@ class BookForm extends StatelessWidget {
           ),
           const Divider(),
           const SizedBox(height: 32),
-          const Center(
+          if (book.thumbnail?.url != null) ... [
-            child: Text(
+            Center(
-              'BOOK DESCRIPTION',
+              child: Image.network(book.thumbnail!.url!),
-              style: TextStyle(
+            ),
-                fontSize: 15,
+            const SizedBox(height: 32),
-                fontWeight: FontWeight.bold,
+          ],
-                decoration: TextDecoration.underline,
+          if (book.summary != null) ... [
+            const Center(
+              child: Text(
+                'BOOK DESCRIPTION',
+                style: TextStyle(
+                  fontSize: 15,
+                  fontWeight: FontWeight.bold,
+                  decoration: TextDecoration.underline,
+                ),
               ),
             ),
-          ),
+            const SizedBox(height: 12),
-          const SizedBox(height: 12),
+            Text(
-          Text(
+              book.summary ?? '',
-            book.summary ?? '',
+              style: TextStyle(color: Colors.grey.shade600, height: 1.24),
-            style: TextStyle(color: Colors.grey.shade600, height: 1.24),
+            ),
-          ),
+          ]
         ],
       ),
     );

add_to_app/books/ios_books/IosBooks.xcodeproj/project.pbxproj

@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 51;
+	objectVersion = 50;
 	objects = {
 
 /* Begin PBXBuildFile section */
@@ -113,7 +113,7 @@
 				0DDE4C3325E0390700389930 /* Sources */,
 				0DDE4C3425E0390700389930 /* Frameworks */,
 				0DDE4C3525E0390700389930 /* Resources */,
-				F82F2089B06A5489DA98C8B9 /* [CP] Embed Pods Frameworks */,
+				CA4628050A0CDB5CBFD737AD /* [CP-User] Embed Flutter Build flutter_module_books Script */,
 			);
 			buildRules = (
 			);
@@ -203,22 +203,15 @@
 			shellPath = /bin/sh;
 			shellScript = "set -e\nset -u\nsource \"${SRCROOT}/../flutter_module_books/.ios/Flutter/flutter_export_environment.sh\"\nexport VERBOSE_SCRIPT_LOGGING=1 && \"$FLUTTER_ROOT\"/packages/flutter_tools/bin/xcode_backend.sh build";
 		};
-		F82F2089B06A5489DA98C8B9 /* [CP] Embed Pods Frameworks */ = {
+		CA4628050A0CDB5CBFD737AD /* [CP-User] Embed Flutter Build flutter_module_books Script */ = {
 			isa = PBXShellScriptBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
 			);
-			inputFileListPaths = (
+			name = "[CP-User] Embed Flutter Build flutter_module_books Script";
-				"${PODS_ROOT}/Target Support Files/Pods-IosBooks/Pods-IosBooks-frameworks-${CONFIGURATION}-input-files.xcfilelist",
-			);
-			name = "[CP] Embed Pods Frameworks";
-			outputFileListPaths = (
-				"${PODS_ROOT}/Target Support Files/Pods-IosBooks/Pods-IosBooks-frameworks-${CONFIGURATION}-output-files.xcfilelist",
-			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "\"${PODS_ROOT}/Target Support Files/Pods-IosBooks/Pods-IosBooks-frameworks.sh\"\n";
+			shellScript = "set -e\nset -u\nsource \"${SRCROOT}/../flutter_module_books/.ios/Flutter/flutter_export_environment.sh\"\nexport VERBOSE_SCRIPT_LOGGING=1 && \"$FLUTTER_ROOT\"/packages/flutter_tools/bin/xcode_backend.sh embed_and_thin";
-			showEnvVarsInLog = 0;
 		};
 /* End PBXShellScriptBuildPhase section */
 
@@ -381,6 +374,7 @@
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = IosBooks/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
@@ -403,6 +397,7 @@
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_STYLE = Automatic;
+				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = IosBooks/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",

add_to_app/books/ios_books/IosBooks.xcodeproj/xcshareddata/xcschemes/IosBooks.xcscheme

@@ -0,0 +1,78 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1320"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "0DDE4C3625E0390700389930"
+               BuildableName = "IosBooks.app"
+               BlueprintName = "IosBooks"
+               ReferencedContainer = "container:IosBooks.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0DDE4C3625E0390700389930"
+            BuildableName = "IosBooks.app"
+            BlueprintName = "IosBooks"
+            ReferencedContainer = "container:IosBooks.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0DDE4C3625E0390700389930"
+            BuildableName = "IosBooks.app"
+            BlueprintName = "IosBooks"
+            ReferencedContainer = "container:IosBooks.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

add_to_app/books/ios_books/IosBooks/ViewController.swift

@@ -47,7 +47,10 @@ class ViewController: UITableViewController, BKHostBookApi {
               let authors = (volumeInfo["authors"] as! [String]).joined(separator: " & ")
               let pageCount = volumeInfo["pageCount"] as! Int32
               let publishedDate = volumeInfo["publishedDate"] as! String
-              let summary = volumeInfo["description"] as! String
+              let summary = volumeInfo["description"] as! String?
+              let imageLinks = volumeInfo["imageLinks"] as! [String: Any]
+              let thumbnail: BKThumbnail = BKThumbnail.init()
+              thumbnail.url = imageLinks["thumbnail"] as! String?
               let book: BKBook = BKBook.init()
               book.author = authors
               book.title = title
@@ -56,6 +59,7 @@ class ViewController: UITableViewController, BKHostBookApi {
               book.pageCount = NSNumber.init(value: pageCount)
               book.publishDate = publishedDate
               book.summary = summary
+              book.thumbnail = thumbnail
               newBooks.append(book)
             }
             DispatchQueue.main.async {