build(app): hacky fix for building APKs

app/.gitignore

@@ -1,3 +1,6 @@
+# Files generated due to fix
+android/build/app/
+
 # Miscellaneous
 *.class
 *.log

app/CONTRIBUTING.md

@@ -28,6 +28,24 @@ alias flutter-generate='dart run build_runner build --delete-conflicting-outputs
 alias flutter-clean='find . -maxdepth 20 -type f \( -name "*.inject.summary" -o -name "*.inject.dart" -o  -name "*.g.dart" \) -delete'
 ```
 
+## Updating Flutter and Android
+
+... can be super painful, because Java, Gradle, and Kotlin versions may be
+wrong.
+
+Often problems in packages arise that rely on older Gradle versions.
+
+The places to check are:
+
+- Your Flutter version
+- Your `JAVA_HOME` version
+- The Gradle version in `gradle-wrapper.properties`; the recommended versions
+  are "between 7.3 and 7.6.1." (see
+  [Android Java Gradle migration guide](https://docs.flutter.dev/release/breaking-changes/android-java-gradle-migration-guide))
+- The Java version in `android/app/build/gradle`
+- The Java version used for Gradle (check in Android Studio)
+- The Kotlin version in `settings.gradle`
+
 ## Architecture
 
 The app consists of multiple so-called modules. Our main modules (usually app

app/android/build.gradle

@@ -18,6 +18,55 @@ allprojects {
     }
 }
 
+subprojects {
+    afterEvaluate { project ->
+        // From https://medium.com/@vortj/solving-namespace-errors-in-flutters-android-gradle-configuration-c2baa6262f8b
+        if (project.hasProperty('android')) {
+            project.android {
+                if (namespace == null) {
+                    namespace = project.group.toString()  // Set namespace as fallback
+                }
+                project.tasks.whenTaskAdded { task ->
+                    if (task.name.contains('processDebugManifest') || task.name.contains('processReleaseManifest')) {
+                        task.doFirst {
+                            File manifestFile = file("${projectDir}/src/main/AndroidManifest.xml")
+                            if (manifestFile.exists()) {
+                                String manifestContent = manifestFile.text
+                                if (manifestContent.contains('package=')) {
+                                    manifestContent = manifestContent.replaceAll(/package="[^"]*"/, "")
+                                    manifestFile.write(manifestContent)
+                                    println "Removed 'package' attribute from ${manifestFile}"
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        // From https://github.com/flutter/flutter/issues/153281#issuecomment-2292201697
+        if (project.extensions.findByName("android") != null) {
+            Integer pluginCompileSdk = project.android.compileSdk
+            if (pluginCompileSdk != null && pluginCompileSdk < 31) {
+                project.logger.error(
+                        "Warning: Overriding compileSdk version in Flutter plugin: "
+                                + project.name
+                                + " from "
+                                + pluginCompileSdk
+                                + " to 31 (to work around https://issuetracker.google.com/issues/199180389)."
+                                + "\nIf there is not a new version of " + project.name + ", consider filing an issue against "
+                                + project.name
+                                + " to increase their compileSdk to the latest (otherwise try updating to the latest version)."
+                )
+                project.android {
+                    compileSdk 31
+                }
+            }
+        }
+    }
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+    project.evaluationDependsOn(":app")
+}
+
 rootProject.buildDir = '../build'
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
@@ -27,3 +76,10 @@ subprojects {
 tasks.register("clean", Delete) {
     delete rootProject.buildDir
 }
+
+// From https://stackoverflow.com/a/69050529
+configurations.all {
+    resolutionStrategy {
+        force 'androidx.core:core-ktx:1.6.0'
+    }
+}