Update build.gradle (#125)

Author: MarcosSarges

android/build.gradle

@@ -1,24 +1,40 @@
 
 buildscript {
+     ext {
+        buildToolsVersion = "28.0.3"
+        minSdkVersion = 16
+        compileSdkVersion = 28
+        targetSdkVersion = 28
+        supportLibVersion = "28.0.0"
+    }
     repositories {
+        google()
         jcenter()
     }
-
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.3.1'
+        classpath 'com.android.tools.build:gradle:3.3.1'
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
     }
 }
 
 
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion "25.0.1"
+     compileSdkVersion rootProject.ext.compileSdkVersion
+     compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    compileSdkVersion 26
+  compileSdkVersion rootProject.ext.compileSdkVersion
 
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 22
+        minSdkVersion rootProject.ext.minSdkVersion
+        targetSdkVersion rootProject.ext.targetSdkVersion
         versionCode 1
         versionName "1.0"
         ndk {
@@ -33,6 +49,6 @@ repositories {
 
 
 dependencies {
-    compile 'com.tom_roush:pdfbox-android:1.8.10.0'
-    compile 'com.facebook.react:react-native:+'
+    implementation 'com.tom_roush:pdfbox-android:1.8.10.0'
+    implementation 'com.facebook.react:react-native:+'
 }