Remove package attributre from AndroidManifest as gradle build step (so you don't have to explicitly clone/modify third party modules)

gradle-remove-package-attrib

credits: https://github.com/SabriGhazali
source: https://github.com/proyecto26/react-native-inappbrowser/issues/451#issuecomment-2275538714

At project-level, android/build.gradle

allprojects {
    subprojects {
        afterEvaluate { project ->
            if (project.hasProperty('android')) {
                project.android {
                    if (namespace == null || namespace.isEmpty()) {
                        def defaultNamespace = project.group.toString().replace('.', '_')
                        namespace = defaultNamespace
                    }

                    buildFeatures {
                        buildConfig = true
                    }
                }

                // Task to ensure namespace and remove package attribute
                project.tasks.register("fixManifestsAndNamespace") {
                    doLast {
                        // Ensure namespace in build.gradle
                        def buildGradleFile = file("${project.projectDir}/build.gradle")
                        if (buildGradleFile.exists()) {
                            def buildGradleContent = buildGradleFile.getText('UTF-8')
                            def manifestFile = file("${project.projectDir}/src/main/AndroidManifest.xml")
                            if (manifestFile.exists()) {
                                def manifestContent = manifestFile.getText('UTF-8')
                                def packageName = manifestContent.find(/package="([^"]+)"/) { match, p -> p }
                                if (packageName && !buildGradleContent.contains("namespace")) {
                                println "Setting namespace in ${buildGradleFile}"
                                buildGradleContent = buildGradleContent.replaceFirst(
                                    /android\s*\{/, "android {\n    namespace '${packageName}'"
                                )
                                buildGradleFile.write(buildGradleContent, 'UTF-8')
                                }
                            }
                        }

                        // Remove package attribute from AndroidManifest.xml
                        def manifests = fileTree(dir: project.projectDir, includes: ['**/AndroidManifest.xml'])
                        manifests.each { File manifestFile ->
                            def manifestContent = manifestFile.getText('UTF-8')
                            if (manifestContent.contains('package=')) {
                                println "Removing package attribute from ${manifestFile}"
                                manifestContent = manifestContent.replaceAll(/package="[^"]*"/, '')
                                manifestFile.write(manifestContent, 'UTF-8')
                            }
                        }
                    }
                }

                // Ensure the task runs before the build process
                project.tasks.matching { it.name.startsWith("preBuild") }.all {
                    dependsOn project.tasks.named("fixManifestsAndNamespace")
                }
            }
        }
    }
}