android sdk版本从主项目中查找

Author: hzlgit

.gitignore

@@ -4,3 +4,4 @@ android/build
 android/.idea/
 .DS_Store
 .idea/
+react-native-android.md

android/build.gradle

@@ -1,13 +1,20 @@
 apply plugin: 'com.android.library'
 
+def DEFAULT_COMPILE_SDK_VERSION   = 27
+def DEFAULT_BUILD_TOOLS_VERSION   = "27.0.3"
+def DEFAULT_TARGET_SDK_VERSION    = 27
+def DEFAULT_MIN_SDK_VERSION       = 16
+def DEFAULT_SUPPOR_LIBVERSION = "27.0.3"
+
 android {
 //    useLibrary 'org.apache.http.legacy'
 
-    compileSdkVersion 26
+    compileSdkVersion rootProject.hasProperty('compileSdkVersion') ? rootProject.compileSdkVersion : DEFAULT_COMPILE_SDK_VERSION
+
 
     defaultConfig {
-        minSdkVersion 16
-        targetSdkVersion 26
+        minSdkVersion rootProject.hasProperty('minSdkVersion') ? rootProject.minSdkVersion : DEFAULT_MIN_SDK_VERSION
+        targetSdkVersion rootProject.hasProperty('targetSdkVersion') ? rootProject.targetSdkVersion : DEFAULT_TARGET_SDK_VERSION
         versionCode 1
         versionName "1.0"
         ndk {