diff --git a/android/build.gradle b/android/build.gradle
index 261655d..6f3937f 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -11,13 +11,17 @@ buildscript {
 
 apply plugin: 'com.android.library'
 
+def safeExtGet(prop, fallback) {
+    rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
+}
+
 android {
-    compileSdkVersion 23
-    buildToolsVersion '27.0.3'
+    compileSdkVersion safeExtGet('compileSdkVersion', 23)
+    buildToolsVersion safeExtGet('buildToolsVersion', '27.0.3')
 
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 22
+        minSdkVersion safeExtGet('minSdkVersion', 16)
+        targetSdkVersion  safeExtGet('targetSdkVersion', 22)
         versionCode 1
         versionName "1.0"
     }
@@ -34,4 +38,4 @@ dependencies {
     compile 'com.facebook.react:react-native:+'
     compile 'com.aliyun.dpa:oss-android-sdk:+'
 }
-  
\ No newline at end of file
+