Update project to use Android Gradle plugin 4.0 and support Java 8 desugaring.

Also migrate from kotlin-stdlib-jdk7 to kotlin-stdlib-jdk8.

android/BOINC/.idea/jarRepositories.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="Google" />
+      <option name="name" value="Google" />
+      <option name="url" value="https://maven.google.com/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="BintrayJCenter" />
+      <option name="name" value="BintrayJCenter" />
+      <option name="url" value="https://jcenter.bintray.com/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="MavenRepo" />
+      <option name="name" value="MavenRepo" />
+      <option name="url" value="https://repo.maven.apache.org/maven2/" />
+    </remote-repository>
+  </component>
+</project>

android/BOINC/app/build.gradle

@@ -57,6 +57,9 @@ android {
         targetSdkVersion 28
         versionCode buildVersionCode().toInteger()
         versionName buildVersionName()
+
+        // Required when setting minSdkVersion to 20 or lower
+        multiDexEnabled true
     }
 
     buildTypes {
@@ -76,6 +79,9 @@ android {
     compileOptions {
         sourceCompatibility '1.8'
         targetCompatibility '1.8'
+
+        // Flag to enable support for the new language APIs
+        coreLibraryDesugaringEnabled true
     }
     kotlinOptions {
         jvmTarget = '1.8'
@@ -105,12 +111,15 @@ ext {
 }
 
 dependencies {
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.0.5'
+    implementation 'androidx.multidex:multidex:2.0.1'
+
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
     implementation 'androidx.core:core-ktx:1.2.0'
     implementation 'commons-io:commons-io:2.6'
     implementation 'org.apache.commons:commons-lang3:3.10'
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
 
     testImplementation 'androidx.test:core:1.2.0'
     testImplementation 'com.google.guava:guava-testlib:28.2-jre'

android/BOINC/app/src/main/AndroidManifest.xml

@@ -60,7 +60,8 @@
             android:label="@string/app_name"
             android:theme="@style/Theme.Styled"
             android:largeHeap="true"
-            android:banner="@drawable/banner">
+            android:banner="@drawable/banner"
+            android:name="androidx.multidex.MultiDexApplication">
 
         <activity
                 android:name="edu.berkeley.boinc.SplashActivity"
@@ -81,11 +82,6 @@
                 android:label="@string/app_name"
                 android:launchMode="singleTop"
                 android:exported="true"/>
-        <activity android:name="edu.berkeley.boinc.attach.AcctMgrFragment">
-            <meta-data
-                    android:name="android.support.PARENT_ACTIVITY"
-                    android:value="edu.berkeley.boinc.BOINCActivity"/>
-        </activity>
         <activity
                 android:name="edu.berkeley.boinc.attach.SelectionListActivity"
                 android:theme="@style/Theme.Styled.NoActionBar"/>

android/BOINC/build.gradle

@@ -10,7 +10,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.6.3'
+        classpath 'com.android.tools.build:gradle:4.0.0-rc01'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath 'com.vanniktech:gradle-android-junit-jacoco-plugin:0.16.0'
     }