upgrading build tools and NuGet packages. switching to Xamarin's Biometric Bindings (even though this reverts from 1.0.1 to 1.0.0) because of build issues/incompatibilities

src/java/JavaFileStorageTest-AS/app/build.gradle

@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 26
+    compileSdkVersion 28
     buildToolsVersion '28.0.3'
 
     defaultConfig {
         applicationId "com.crocoapps.javafilestoragetest"
         minSdkVersion 21
-        targetSdkVersion 23
+        targetSdkVersion 28
         versionCode 1
         versionName "1.0"
         multiDexEnabled true
@@ -28,7 +28,7 @@ android {
     }
 }
 
-apply plugin: 'com.getkeepsafe.dexcount'
+//apply plugin: 'com.getkeepsafe.dexcount'
 
 dependencies {
     compile project(':android-filechooser')

src/java/JavaFileStorageTest-AS/app/src/main/AndroidManifest.xml

@@ -8,7 +8,6 @@
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
-        tools:replace="android:icon"
         android:theme="@style/AppTheme">
         <activity android:name=".MainActivity">
             <intent-filter>

src/java/JavaFileStorageTest-AS/build.gradle

@@ -9,11 +9,11 @@ buildscript {
         }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.android.tools.build:gradle:3.3.2'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
-        classpath 'com.getkeepsafe.dexcount:dexcount-gradle-plugin:0.7.1'
+        //classpath 'com.getkeepsafe.dexcount:dexcount-gradle-plugin:0.7.1'
     }
 
 }

src/java/JavaFileStorageTest-AS/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.3-all.zip