Merge pull with updates from API level 21 to API level 28

.gitignore

@@ -1,6 +1,48 @@
+#built application files
+*.apk
+*.ap_
+
+# files for the dex VM
+*.dex
+
+# Java class files
+*.class
+
+# built native files (uncomment if you build your own)
+# *.o
+# *.so
+
+# generated files
+bin/
+gen/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Eclipse Metadata
+.metadata/
+
+# OSX files
+.DS_Store
+
+#Screenshot
+captures
+
+# Android Studio Projects
+*.iml
+app/app.iml
+.idea
 .gradle
-/local.properties
+/build
+.navigation
+.idea/gradle.xml
 /.idea/workspace.xml
+/.idea/tasks.xml
 /.idea/libraries
-.DS_Store
-/build
+
+#NDK
+obj/
+.externalNativeBuild

app/build.gradle

@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 21
-    buildToolsVersion '25.0.0'
+    compileSdkVersion versions.compileSdk
+    buildToolsVersion "${versions.buildTools}"
 
     defaultConfig {
         applicationId "com.danielkim.soundrecorder"
-        minSdkVersion 16
-        targetSdkVersion 21
+        minSdkVersion versions.minSdk
+        targetSdkVersion versions.targetSdk
         versionCode 130
         versionName "1.3.0"
     }
@@ -20,12 +20,18 @@ android {
     lintOptions{
         disable 'MissingTranslation'
     }
+    configurations.all {
+        resolutionStrategy {
+            force "com.android.support:support-v4:${versions.support}"
+        }
+    }
 }
 
 dependencies {
-    compile 'com.android.support:appcompat-v7:21.0.+'
-    compile 'com.android.support:cardview-v7:21.0.+'
-    compile 'com.android.support:recyclerview-v7:21.0.+'
-    compile 'com.melnykov:floatingactionbutton:1.1.0'
-    compile 'com.jpardogo.materialtabstrip:library:1.0.6'
+    implementation "com.android.support:appcompat-v7:${versions.support}"
+    implementation "com.android.support:cardview-v7:${versions.support}"
+    implementation "com.android.support:recyclerview-v7:${versions.support}"
+
+    implementation "com.melnykov:floatingactionbutton:${versions.floatingActionButton}"
+    implementation "com.jpardogo.materialtabstrip:library:${versions.materialTabStrip}"
 }