os 9でhttp通信有効設定・allowBackUpをfalse設定

ABVJE_Launcher_Android/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     package="jp.agentec.abookplus"
     android:versionCode="1"
     android:versionName="@string/version_name"
@@ -44,6 +45,9 @@
         android:icon="@drawable/app_icon"
         android:label="@string/app_name"
         android:theme="@style/ABook"
+        android:allowBackup="false"
+        tools:replace="android:allowBackup"
+        android:usesCleartextTraffic="true"
         android:largeHeap="true" >
 
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ABVJE_Launcher_Android/build.gradle

@@ -17,8 +17,8 @@ dependencies {
 }
 
 android {
-    compileSdkVersion 21
-    buildToolsVersion '27.0.3'
+    compileSdkVersion 28
+    buildToolsVersion '28.0.3'
 
     defaultConfig {
         minSdkVersion 23