Resolve "Improve signing process and get application version"

Closes #15 (closed)

android/app/build.gradle

@@ -6,19 +6,27 @@ if (localPropertiesFile.exists()) {
     }
 }
 
+def gradleProperties = new Properties()
+def gradlePropertiesFile = rootProject.file('gradle.properties')
+if (gradlePropertiesFile.exists()) {
+    gradlePropertiesFile.withReader('UTF-8') { reader ->
+        gradleProperties.load(reader)
+    }
+}
+
 def flutterRoot = localProperties.getProperty('flutter.sdk')
 if (flutterRoot == null) {
     throw new FileNotFoundException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
 }
 
-def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
-if (flutterVersionCode == null) {
-    flutterVersionCode = '1'
+def appVersionCode = gradleProperties.getProperty('app.versionCode')
+if (appVersionCode == null) {
+    appVersionCode = '1'
 }
 
-def flutterVersionName = localProperties.getProperty('flutter.versionName')
-if (flutterVersionName == null) {
-    flutterVersionName = '1.0'
+def appVersionName = gradleProperties.getProperty('app.versionName')
+if (appVersionName == null) {
+    appVersionName = '1.0'
 }
 
 apply plugin: 'com.android.application'
@@ -41,8 +49,8 @@ android {
         applicationId "org.benoitharrault.hangman"
         minSdkVersion 21
         targetSdkVersion 29
-        versionCode flutterVersionCode.toInteger()
-        versionName flutterVersionName
+        versionCode appVersionCode.toInteger()
+        versionName appVersionName
         archivesBaseName = "$applicationId" + "_" + "$versionCode"
     }