Add Java 8 API desugaring support.

build.gradle

@@ -20,6 +20,8 @@ android {
         minSdkVersion 14
         targetSdkVersion 29
         proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+
+        multiDexEnabled true
     }
     dexOptions {
         javaMaxHeapSize "2g"
@@ -27,6 +29,9 @@ android {
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
+
+        // Flag to enable support for the new language APIs
+        coreLibraryDesugaringEnabled true
     }
     sourceSets {
         main {
@@ -130,6 +135,9 @@ dependencies {
         */
     }
 
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.0.9'
+    implementation 'androidx.multidex:multidex:2.0.1'
+
     implementation 'androidx.media:media:1.1.0'
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'androidx.preference:preference:1.1.1'

gradle.properties

@@ -1,11 +1,2 @@
 android.enableJetifier=true
 android.useAndroidX=true
-###
-# This 'android.enableR8' property only matters when the current
-# build variant has 'minifyEnabled true'.
-#
-# Set this to false to use ProGuard.
-# Set this to true to use R8.
-#
-# Default: true
-android.enableR8=false

src/org/kde/kdeconnect/MyApplication.java

@@ -1,13 +1,12 @@
 package org.kde.kdeconnect;
 
-import android.app.Application;
-
 import androidx.annotation.NonNull;
 import androidx.lifecycle.DefaultLifecycleObserver;
 import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.ProcessLifecycleOwner;
+import androidx.multidex.MultiDexApplication;
 
-public class MyApplication extends Application {
+public class MyApplication extends MultiDexApplication {
     private static class LifecycleObserver implements DefaultLifecycleObserver {
         private boolean inForeground = false;