up the sdk to 28 and some other changes

.travis.yml

@@ -4,18 +4,17 @@ jdk: oraclejdk8
 
 env:
   global:
-  - ANDROID_API_LEVEL=26
-  - ANDROID_BUILD_TOOLS_VERSION=26.0.0
-  - ANDROID_ABI=armeabi-v7a
-  - ANDROID_ABI=X86
-  - ANDROID_ABI=ARMEABI_V7A
+  - ANDROID_API_LEVEL=28
+  - ANDROID_BUILD_TOOLS_VERSION=28.0.3
+ # - ANDROID_ABI=armeabi-v7a
+ # - ANDROID_ABI=X86
+ # - ANDROID_ABI=ARMEABI_V7A
 
 android:
   components:
     - tools
     - build-tools-$ANDROID_BUILD_TOOLS_VERSION
     - android-$ANDROID_API_LEVEL
-    - extra-android-m2repository
   licenses:
     - yes | sudo sdkmanager --licenses
     - 'android-sdk-preview-license-52d11cd2'
@@ -23,8 +22,8 @@ android:
     - 'google-gdk-license-.+'
 
 before_install:  
-  - yes | sdkmanager "platforms;android-26"
-  - yes | sdkmanager "build-tools;26.0.0"
+#  - yes | sdkmanager "platforms;android-26"
+#  - yes | sdkmanager "build-tools;26.0.0"
   - yes | sdkmanager "platforms;android-28"
   - yes | sdkmanager "build-tools;28.0.3"
 
@@ -56,4 +55,4 @@ deploy:
   overwrite: true
   target_commitish: $TRAVIS_COMMIT
   on:
-    branch: gl4es_lwjgl3
+    branch: gl4es_lwjgl3A