Fixes for tablayout and tablets

Author: opt05

.gitignore

@@ -5,7 +5,7 @@ build/
 # Local configuration file (sdk path, etc)
 local.properties
 release.properties
-android_keystore.jks
+*.jks
 
 # Gradle generated files
 .gradle/

app/src/main/res/layout/activity_main.xml

@@ -30,7 +30,7 @@
                 android:theme="@style/AppTheme.AppBarOverlay"
                 app:popupTheme="@style/AppTheme.PopupThemeOverlay"
                 app:tabMode="fixed"
-                app:tabGravity="fill"
+                app:tabGravity="center"
                 app:tabBackground="?colorPrimary"
                 app:tabIndicatorColor="?colorAccent"
                 app:tabIndicatorHeight="4dp"