diff --git a/android/build.gradle b/android/build.gradle
index ccd521a3..0147bf08 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -11,15 +11,17 @@ buildscript {
 
 apply plugin: 'com.android.library'
 
+def safeExtGet(prop, fallback) {
+    rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
+}
+
 android {
-    compileSdkVersion 25
-    buildToolsVersion "25.0.0"
+    compileSdkVersion safeExtGet('compileSdkVersion', 28)
+    buildToolsVersion safeExtGet('buildToolsVersion', '28.0.3')
 
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 26
-        versionCode 1
-        versionName "1.0"
+        minSdkVersion safeExtGet('minSdkVersion', 16)
+        targetSdkVersion safeExtGet('targetSdkVersion', 28)
     }
     lintOptions {
         abortOnError false
diff --git a/android/src/main/java/com/philipphecht/RNDocViewerModule.java b/android/src/main/java/com/philipphecht/RNDocViewerModule.java
index b1693256..3be67cd8 100644
--- a/android/src/main/java/com/philipphecht/RNDocViewerModule.java
+++ b/android/src/main/java/com/philipphecht/RNDocViewerModule.java
@@ -9,7 +9,6 @@
 import com.facebook.react.bridge.ReactMethod;
 import com.facebook.react.bridge.ReadableMap;
 import com.facebook.react.bridge.ReadableArray;
-import com.facebook.react.views.webview.ReactWebViewManager;
 
 /* bridge react native
 int size();
@@ -31,7 +30,7 @@
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
-import android.support.v4.content.FileProvider;
+import androidx.core.content.FileProvider;
 
 import android.content.ActivityNotFoundException;
 import android.content.Context;
@@ -42,7 +41,6 @@
 import android.webkit.MimeTypeMap;
 import android.widget.Toast;
 import android.util.Log;
-import android.webkit.WebView;
 
 public class RNDocViewerModule extends ReactContextBaseJavaModule {
   public static final int ERROR_NO_HANDLER_FOR_DATA_TYPE = 53;