修复android 8.0bug

v5/android/android_sdk/Demo/app/build.gradle

@@ -1,12 +1,12 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion "26.0.0"
+    compileSdkVersion 28
+    buildToolsVersion "28.0.3"
     defaultConfig {
         applicationId "com.vtpayment.plugin"
-        minSdkVersion 16
-        targetSdkVersion 25
+        minSdkVersion 19
+        targetSdkVersion 28
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"