Gradle can build the majority of a custom app

app/build.gradle

@@ -85,15 +85,43 @@ dependencies {
         buildConfigField "long", "ZIM_FILE_SIZE", "0"
         buildConfigField "int", "CONTENT_VERSION_CODE", "0"
         buildConfigField "String", "ENFORCED_LANG", "\"\""
+        resValue "string", "app_name", "Kiwix"
+        resValue "string", "app_search_string", "Search Kiwix"
+
       }
       custom {
-        applicationId "org.kiwix.kiwixcustomtest"
+        if (project.hasProperty('jsonFile')) {
+          def jsonFile = file(project.property('jsonFile'))
+          def parsedJson = new groovy.json.JsonSlurper().parseText(jsonFile.text)
+          applicationId "$parsedJson.package"
           buildConfigField "boolean", "IS_CUSTOM_APP", "true"
+          buildConfigField "boolean", "HAS_EMBEDDED_ZIM", "$parsedJson.embed_zim"
+          if (parsedJson.zim_file.lastIndexOf('/') >= 0) {
+            buildConfigField "String", "ZIM_FILE_NAME", parsedJson.zim_file.substring(parsedJson.zim_file.lastIndexOf('/'))
+          } else {
+            buildConfigField "String", "ZIM_FILE_NAME", "\"$parsedJson.zim_file\""
+          }
+          File file = new File(parsedJson.zim_file)
+          long length = file.length()
+          buildConfigField "long", "ZIM_FILE_SIZE", "$length"
+          if (parsedJson.content_version_code != null) {
+            buildConfigField "int", "CONTENT_VERSION_CODE", "$parsedJson.content_version_code"
+          } else {
+            buildConfigField "int", "CONTENT_VERSION_CODE", "$parsedJson.version_code"
+          }
+          buildConfigField "String", "ENFORCED_LANG", "\"$parsedJson.enforced_lang\""
+          resValue "string", "app_name", "$parsedJson.app_name"
+          resValue "string", "app_search_string", 'Search ' + "$parsedJson.app_name"
+        } else {
+          buildConfigField "boolean", "IS_CUSTOM_APP", "false"
           buildConfigField "boolean", "HAS_EMBEDDED_ZIM", "false"
           buildConfigField "String", "ZIM_FILE_NAME", "\"\""
           buildConfigField "long", "ZIM_FILE_SIZE", "0"
           buildConfigField "int", "CONTENT_VERSION_CODE", "0"
           buildConfigField "String", "ENFORCED_LANG", "\"\""
+          resValue "string", "app_name", "Custom"
+          resValue "string", "app_search_string", "Search Custom"
+        }
       }
     }
 

app/src/custom/AndroidManifest.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:tools="http://schemas.android.com/tools">
+<uses-permission android:name="android.permission.INTERNET" tools:node="remove"/>
+</manifest>

app/src/main/res/values/branding.xml

@@ -1,5 +0,0 @@
-<?xml version='1.0' encoding='UTF-8'?>
-<resources>
-  <string name="app_name">Kiwix</string>
-  <string name="app_search_string">Search Kiwix</string>
-</resources>