set Target SDK back to 25 (->for release)

app/build.gradle

@@ -1,15 +1,15 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 26
-    buildToolsVersion '26.0.0'
+    compileSdkVersion project.ext.compileSdkVersion
+    buildToolsVersion project.ext.buildToolsVersion
 
     defaultConfig {
-        applicationId "org.y20k.trackbook"
-        minSdkVersion 22
-        targetSdkVersion 26
-        versionCode 11
-        versionName "1.0.4 (Astronomy Domine)"
+        applicationId project.ext.applicationId
+        minSdkVersion project.ext.minSdkVersion
+        targetSdkVersion project.ext.targetSdkVersion
+        versionCode project.ext.versionCode
+        versionName project.ext.versionName
         vectorDrawables.useSupportLibrary = true
     }
     buildTypes {
@@ -22,9 +22,9 @@ android {
 
 dependencies {
     compile fileTree(include: ['*.jar'], dir: 'libs')
-    compile 'com.android.support:appcompat-v7:26.0.0-beta2'
-    compile 'com.android.support:design:26.0.0-beta2'
-    compile 'com.android.support:cardview-v7:26.0.0-beta2'
+    compile 'com.android.support:appcompat-v7:' + supportLibraryVersion
+    compile 'com.android.support:design:' + supportLibraryVersion
+    compile 'com.android.support:cardview-v7:' + supportLibraryVersion
     compile 'org.osmdroid:osmdroid-android:5.6.4'
     compile 'com.google.code.gson:gson:2.8.1'
 }

build.gradle

@@ -19,6 +19,22 @@ allprojects {
             url "https://maven.google.com"
         }
     }
+    project.ext {
+        applicationId = 'org.y20k.trackbook'
+        versionCode = 11
+        versionName = '1.0.4 (Astronomy Domine)'
+        minSdkVersion = 22
+        // Android N - release
+        compileSdkVersion = 25
+        targetSdkVersion = 25
+        buildToolsVersion = '25.0.3 '
+        supportLibraryVersion = '25.4.0'
+        // Android O - test
+//        compileSdkVersion = 26
+//        targetSdkVersion = 26
+//        buildToolsVersion = '26.0.0'
+//        supportLibraryVersion = '26.0.0-beta2'
+    }
 }
 
 task clean(type: Delete) {