update build tools

.gitignore

@@ -196,3 +196,85 @@ fastlane/Preview.html
 fastlane/screenshots
 fastlane/test_output
 fastlane/readme.md
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/usage.statistics.xml
+
+# Sensitive or high-churn files
+.idea/**/dbnavigator.xml
+
+# Gradle
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+
+# File-based project format
+
+# IntelliJ
+
+# mpeltonen/sbt-idea plugin
+
+# JIRA plugin
+
+# Cursive Clojure plugin
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+
+# Editor-based Rest Client
+### Android template
+# Built application files
+
+# Files for the ART/Dalvik VM
+
+# Java class files
+
+# Generated files
+
+# Gradle files
+
+# Local configuration file (sdk path, etc)
+
+# Proguard folder generated by Eclipse
+
+# Log Files
+
+# Android Studio Navigation editor temp files
+
+# Android Studio captures folder
+
+# IntelliJ
+
+# Keystore files
+# Uncomment the following line if you do not want to check your keystore files in.
+#*.jks
+
+# External native build folder generated in Android Studio 2.2 and later
+
+# Google Services (e.g. APIs or Firebase)
+
+# Freeline
+
+# fastlane
+### Gradle template
+
+# Ignore Gradle GUI config
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+
+# Cache of project
+
+# # Work around https://youtrack.jetbrains.com/issue/IDEA-116898
+# gradle/wrapper/gradle-wrapper.properties

app/build.gradle

@@ -1,7 +1,7 @@
 apply plugin: 'com.android.application'
 android {
     compileSdkVersion 27
-    buildToolsVersion '27.0.3'
+    buildToolsVersion '28.0.2'
     defaultConfig {
         applicationId "com.rtugeek.android.colorseekbardemo"
         minSdkVersion 14

app/src/main/java/com/rtugeek/android/colorseekbardemo/MainActivity.java

@@ -1,23 +1,16 @@
 package com.rtugeek.android.colorseekbardemo;
 
 import android.content.SharedPreferences;
-import android.graphics.Color;
-import android.os.Handler;
-import android.support.v4.graphics.ColorUtils;
-import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
 import android.util.Log;
-import android.view.View;
 import android.widget.CheckBox;
 import android.widget.CompoundButton;
 import android.widget.SeekBar;
 import android.widget.TextView;
 
 import com.rtugeek.android.colorseekbar.ColorSeekBar;
 
-import java.util.ArrayList;
-import java.util.List;
-
 public class MainActivity extends AppCompatActivity {
     private ColorSeekBar mColorSeekBar;
     private SharedPreferences sp;

build.gradle

@@ -6,7 +6,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.1'
+        classpath 'com.android.tools.build:gradle:3.2.0'
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }

colorseekbar/build.gradle

@@ -2,12 +2,12 @@ apply plugin: 'com.android.library'
 group='com.github.rtugeek'
 android {
     compileSdkVersion 27
-    buildToolsVersion '27.0.3'
+    buildToolsVersion '28.0.2'
     defaultConfig {
         minSdkVersion 14
         targetSdkVersion 27
-        versionCode 6
-        versionName "1.7.1"
+        versionCode 7
+        versionName "1.7.2"
     }
     buildTypes {
         release {