disable parallel building + fix some more kotlin compilation errors

.github/workflows/ci.yml

@@ -71,7 +71,7 @@ jobs:
           CMAKE_C_COMPILER_LAUNCHER: "ccache"
           CMAKE_CXX_COMPILER_LAUNCHER: "ccache"
           CCACHE_COMPILERCHECK: "string:${{ env.NDK_VERSION }}"
-        run: ./gradlew --stacktrace --configuration-cache --build-cache --parallel --configure-on-demand assembleFullRelease assembleFullReldebug
+        run: ./gradlew --stacktrace --configuration-cache --build-cache --configure-on-demand assembleFullRelease assembleFullReldebug
 
       - name: Rename APKs (Signed)
         if: env.IS_BUILD_SIGNED == 'true' && env.UPLOAD_ARTIFACTS == 'true'

app/src/main/java/emu/skyline/EmulationActivity.kt

@@ -647,7 +647,7 @@ class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback, View.OnTo
         val deviceIds = InputDevice.getDeviceIds()
 
         deviceIds.forEach { deviceId ->
-            InputDevice.getDevice(deviceId).apply {
+            InputDevice.getDevice(deviceId)?.apply {
                 // Verify that the device has gamepad buttons, control sticks, or both.
                 if (sources and InputDevice.SOURCE_JOYSTICK == InputDevice.SOURCE_JOYSTICK) {
                     // This device is a game controller.
@@ -691,12 +691,12 @@ class EmulationActivity : AppCompatActivity(), SurfaceHolder.Callback, View.OnTo
                 } else {
                     for (id in InputDevice.getDeviceIds()) {
                         val device = InputDevice.getDevice(id)
-                        if (device.descriptor == inputManager.controllers[index]!!.rumbleDeviceDescriptor) {
+                        if (device?.descriptor == inputManager.controllers[index]!!.rumbleDeviceDescriptor) {
                             val vibrator = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
-                                device.vibratorManager.defaultVibrator
+                                device?.vibratorManager!!.defaultVibrator
                             } else {
                                 @Suppress("DEPRECATION")
-                                device.vibrator!!
+                                device?.vibrator!!
                             }
                             vibrators[index] = vibrator
                             return@let vibrator

gradle.properties

@@ -10,7 +10,7 @@ org.gradle.jvmargs=-Xmx3g -XX:+UseParallelGC
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
-org.gradle.parallel=true
+org.gradle.parallel=false
 # Enable Gradle Daemon
 org.gradle.daemon=true
 # AndroidX package structure to make it clearer which packages are bundled with the