Include Android NDK version in README documentation

Author: developernotes

README.md

@@ -40,6 +40,12 @@ SQLiteDatabaseHook hook = new SQLiteDatabaseHook() {
 
 ### Building 
 
+## Android NDK
+
+Currently, SQLCipher for Android uses NDK version "23.0.7599858".
+
+## External dependencies:
+
 This repository is not batteries-included. Specificially, you will need to build `libcrypto.a`, the static library from OpenSSL using the NDK for the [supported platforms](#compatibility), and bundle the top-level `include` folder from OpenSSL. Additionally, you will need to build a SQLCipher amalgamation. These files will need to be placed in the following locations:
 
 ```

README.md.template

@@ -40,6 +40,12 @@ SQLiteDatabaseHook hook = new SQLiteDatabaseHook() {
 
 ### Building 
 
+## Android NDK
+
+Currently, SQLCipher for Android uses NDK version "<%=androidNdkVersion%>".
+
+## External dependencies:
+
 This repository is not batteries-included. Specificially, you will need to build `libcrypto.a`, the static library from OpenSSL using the NDK for the [supported platforms](#compatibility), and bundle the top-level `include` folder from OpenSSL. Additionally, you will need to build a SQLCipher amalgamation. These files will need to be placed in the following locations:
 
 ```

build.gradle

@@ -26,6 +26,7 @@ allprojects {
 project.ext {
     libraryVersion = "4.4.3"
     androidXSQLiteVersion = "2.1.0"
+    androidNdkVersion = "23.0.7599858"
     mavenLocalRepositoryPrefix = "file://"
     if(project.hasProperty('publishLocal') && publishLocal.toBoolean()){
         mavenSnapshotRepositoryUrl = "outputs/snapshot"
@@ -77,7 +78,8 @@ task generateReadMe {
     def reader = new FileReader("README.md.template")
     def binding = [
                     libraryVersion: project.ext.libraryVersion,
-                    androidXSQLiteVersion: project.ext.androidXSQLiteVersion
+                    androidXSQLiteVersion: project.ext.androidXSQLiteVersion,
+                    androidNdkVersion: project.ext.androidNdkVersion
                   ]
     def template = engine.createTemplate(reader).make(binding)
     readme.write(template.toString())

sqlcipher/build.gradle

@@ -35,7 +35,7 @@ android {
         }
     }
 
-    ndkVersion '23.0.7599858'
+    ndkVersion "${rootProject.ext.androidNdkVersion}"
 
     useLibrary 'android.test.base' // for android.test.AndroidTestCase
     useLibrary 'android.test.runner' // for android.test.MoreAsserts