diff --git a/apct-tests/perftests/core/src/android/input/MotionPredictorBenchmark.kt b/apct-tests/perftests/core/src/android/input/MotionPredictorBenchmark.kt
index 9482591..aadbc23 100644
--- a/apct-tests/perftests/core/src/android/input/MotionPredictorBenchmark.kt
+++ b/apct-tests/perftests/core/src/android/input/MotionPredictorBenchmark.kt
@@ -130,7 +130,7 @@
                 eventTime, ACTION_MOVE, /*x=*/eventPosition, /*y=*/eventPosition)
             predictor.record(moveEvent)
             val predictionTime = eventTime + eventInterval
-            val predicted = predictor.predict(predictionTime.toNanos())
+            val predicted = checkNotNull(predictor.predict(predictionTime.toNanos()))
             assertTrue(predicted.eventTime <= (predictionTime + offset).toMillis())
         }
     }
diff --git a/core/tests/PackageInstallerSessions/src/android/content/pm/PackageSessionTests.kt b/core/tests/PackageInstallerSessions/src/android/content/pm/PackageSessionTests.kt
index 9acb99a..b794352 100644
--- a/core/tests/PackageInstallerSessions/src/android/content/pm/PackageSessionTests.kt
+++ b/core/tests/PackageInstallerSessions/src/android/content/pm/PackageSessionTests.kt
@@ -445,7 +445,9 @@
                     Manifest.permission.UPDATE_PACKAGES_WITHOUT_USER_ACTION)
         }
         handlerThread = HandlerThread("PackageSessionTests")
-        handlerThread?.start()
-        handler = Handler(handlerThread?.looper)
+        handlerThread?.let {
+            it.start()
+            handler = Handler(it.looper)
+        }
     }
 }
diff --git a/packages/EasterEgg/src/com/android/egg/quares/QuaresActivity.kt b/packages/EasterEgg/src/com/android/egg/quares/QuaresActivity.kt
index 5fa6137..562f7be 100644
--- a/packages/EasterEgg/src/com/android/egg/quares/QuaresActivity.kt
+++ b/packages/EasterEgg/src/com/android/egg/quares/QuaresActivity.kt
@@ -293,7 +293,7 @@
         return correct
     }
 
-    override fun onDraw(canvas: Canvas?) {
+    override fun onDraw(canvas: Canvas) {
         super.onDraw(canvas)
         if (!showText) return
         canvas?.let {
diff --git a/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/model/app/AppListRepository.kt b/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/model/app/AppListRepository.kt
index 8e0cf89..a428142 100644
--- a/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/model/app/AppListRepository.kt
+++ b/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/model/app/AppListRepository.kt
@@ -78,6 +78,7 @@
             packageManager.getInstalledModules(0)
                 .filter { it.isHidden }
                 .map { it.packageName }
+                .filterNotNull()
                 .toSet()
         }
         val hideWhenDisabledPackagesDeferred = async {
diff --git a/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/model/app/PackageManagers.kt b/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/model/app/PackageManagers.kt
index 69c6131..92fd0cd 100644
--- a/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/model/app/PackageManagers.kt
+++ b/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/model/app/PackageManagers.kt
@@ -82,7 +82,8 @@
         val packageInfo = getPackageInfoAsUser(packageName, PackageManager.GET_PERMISSIONS, userId)
         val index = packageInfo?.requestedPermissions?.indexOf(permission) ?: return false
         return index >= 0 &&
-            packageInfo.requestedPermissionsFlags[index].hasFlag(REQUESTED_PERMISSION_GRANTED)
+            checkNotNull(packageInfo.requestedPermissionsFlags)[index]
+                .hasFlag(REQUESTED_PERMISSION_GRANTED)
     }
 
     override suspend fun getAppOpPermissionPackages(userId: Int, permission: String): Set<String> =
diff --git a/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/model/enterprise/EnterpriseRepository.kt b/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/model/enterprise/EnterpriseRepository.kt
index cc3584b..dfd8f6b 100644
--- a/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/model/enterprise/EnterpriseRepository.kt
+++ b/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/model/enterprise/EnterpriseRepository.kt
@@ -28,7 +28,7 @@
     }
 
     fun getEnterpriseString(updatableStringId: String, resId: Int): String =
-        resources.getString(updatableStringId) { context.getString(resId) }
+        checkNotNull(resources.getString(updatableStringId) { context.getString(resId) })
 
     fun getProfileTitle(isManagedProfile: Boolean): String = if (isManagedProfile) {
         getEnterpriseString(WORK_CATEGORY_HEADER, R.string.category_work)
diff --git a/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/template/app/AppInfo.kt b/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/template/app/AppInfo.kt
index cee750e..ea83e1d 100644
--- a/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/template/app/AppInfo.kt
+++ b/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/template/app/AppInfo.kt
@@ -58,7 +58,7 @@
                 .semantics(mergeDescendants = true) {},
             horizontalAlignment = Alignment.CenterHorizontally,
         ) {
-            val app = packageInfo.applicationInfo
+            val app = checkNotNull(packageInfo.applicationInfo)
             Box(modifier = Modifier.padding(SettingsDimension.itemPaddingAround)) {
                 AppIcon(app = app, size = SettingsDimension.appIconInfoSize)
             }
diff --git a/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/template/app/TogglePermissionAppInfoPage.kt b/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/template/app/TogglePermissionAppInfoPage.kt
index 7f82be4..62c5f70 100644
--- a/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/template/app/TogglePermissionAppInfoPage.kt
+++ b/packages/SettingsLib/SpaPrivileged/src/com/android/settingslib/spaprivileged/template/app/TogglePermissionAppInfoPage.kt
@@ -144,7 +144,7 @@
         footerContent = { AnnotatedText(footerResId) },
         packageManagers = packageManagers,
     ) {
-        val model = createSwitchModel(applicationInfo)
+        val model = createSwitchModel(checkNotNull(applicationInfo))
         val restrictions = Restrictions(userId, switchRestrictionKeys)
         RestrictedSwitchPreference(model, restrictions, restrictionsProviderFactory)
     }
diff --git a/packages/StatementService/src/com/android/statementservice/utils/StatementUtils.kt b/packages/StatementService/src/com/android/statementservice/utils/StatementUtils.kt
index 92d752c..4837aad 100644
--- a/packages/StatementService/src/com/android/statementservice/utils/StatementUtils.kt
+++ b/packages/StatementService/src/com/android/statementservice/utils/StatementUtils.kt
@@ -88,6 +88,7 @@
         } catch (e: Exception) {
             return Result.Failure(e)
         }
+        checkNotNull(signingInfo)
         return if (signingInfo.hasMultipleSigners()) {
             signingInfo.apkContentsSigners
         } else {
diff --git a/services/tests/PackageManager/packageinstaller/src/com/android/packageinstaller/test/ExportedComponentTest.kt b/services/tests/PackageManager/packageinstaller/src/com/android/packageinstaller/test/ExportedComponentTest.kt
index d7d2726..7858b30 100644
--- a/services/tests/PackageManager/packageinstaller/src/com/android/packageinstaller/test/ExportedComponentTest.kt
+++ b/services/tests/PackageManager/packageinstaller/src/com/android/packageinstaller/test/ExportedComponentTest.kt
@@ -43,7 +43,7 @@
         assertThat(packageInstallers).isNotEmpty()
 
         packageInstallers.forEach {
-            val exported = it.receivers.filter { it.exported }
+            val exported = it.receivers?.filter { it.exported }
             assertWithMessage("Receivers should not be exported").that(exported).isEmpty()
         }
     }
diff --git a/services/tests/mockingservicestests/src/com/android/server/pm/SharedLibrariesImplTest.kt b/services/tests/mockingservicestests/src/com/android/server/pm/SharedLibrariesImplTest.kt
index cffd027..6c39275 100644
--- a/services/tests/mockingservicestests/src/com/android/server/pm/SharedLibrariesImplTest.kt
+++ b/services/tests/mockingservicestests/src/com/android/server/pm/SharedLibrariesImplTest.kt
@@ -131,7 +131,7 @@
         wheneverStatic { HexEncoding.decode(STATIC_LIB_NAME, false) }
                 .thenReturn(PackageUtils.computeSha256DigestBytes(
                         mSettings.getPackageLPr(STATIC_LIB_PACKAGE_NAME)
-                            .pkg.signingDetails.signatures!![0].toByteArray()))
+                            .pkg!!.signingDetails.signatures!![0].toByteArray()))
     }
 
     @Test
@@ -239,7 +239,7 @@
         testPackageSetting.setPkgStateLibraryFiles(listOf())
         assertThat(testPackageSetting.usesLibraryFiles).isEmpty()
 
-        mSharedLibrariesImpl.updateSharedLibraries(testPackageSetting.pkg, testPackageSetting,
+        mSharedLibrariesImpl.updateSharedLibraries(testPackageSetting.pkg!!, testPackageSetting,
                 null /* changingLib */, null /* changingLibSetting */, mExistingPackages)
 
         assertThat(testPackageSetting.usesLibraryFiles).hasSize(1)
@@ -252,7 +252,7 @@
         testPackageSetting.setPkgStateLibraryFiles(listOf())
         assertThat(testPackageSetting.usesLibraryFiles).isEmpty()
 
-        mSharedLibrariesImpl.updateSharedLibraries(testPackageSetting.pkg, testPackageSetting,
+        mSharedLibrariesImpl.updateSharedLibraries(testPackageSetting.pkg!!, testPackageSetting,
                 null /* changingLib */, null /* changingLibSetting */, mExistingPackages)
 
         assertThat(testPackageSetting.usesLibraryFiles).hasSize(2)
@@ -266,7 +266,7 @@
         testPackageSetting.setPkgStateLibraryFiles(listOf())
         assertThat(testPackageSetting.usesLibraryFiles).isEmpty()
 
-        mSharedLibrariesImpl.updateSharedLibraries(testPackageSetting.pkg, testPackageSetting,
+        mSharedLibrariesImpl.updateSharedLibraries(testPackageSetting.pkg!!, testPackageSetting,
                 null /* changingLib */, null /* changingLibSetting */, mExistingPackages)
 
         assertThat(testPackageSetting.usesLibraryFiles).hasSize(3)
diff --git a/tests/Input/src/com/android/test/input/UnresponsiveGestureMonitorActivity.kt b/tests/Input/src/com/android/test/input/UnresponsiveGestureMonitorActivity.kt
index e56ce81..63782f1 100644
--- a/tests/Input/src/com/android/test/input/UnresponsiveGestureMonitorActivity.kt
+++ b/tests/Input/src/com/android/test/input/UnresponsiveGestureMonitorActivity.kt
@@ -45,7 +45,7 @@
     private lateinit var mInputMonitor: InputMonitor
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        val inputManager = getSystemService(InputManager::class.java)
+        val inputManager = checkNotNull(getSystemService(InputManager::class.java))
         mInputMonitor = inputManager.monitorGestureInput(MONITOR_NAME, displayId)
         mInputEventReceiver = UnresponsiveReceiver(
                 mInputMonitor.getInputChannel(), Looper.myLooper()!!)
diff --git a/tests/TrustTests/src/android/trust/test/lib/LockStateTrackingRule.kt b/tests/TrustTests/src/android/trust/test/lib/LockStateTrackingRule.kt
index 1400dde..c1a7bd9 100644
--- a/tests/TrustTests/src/android/trust/test/lib/LockStateTrackingRule.kt
+++ b/tests/TrustTests/src/android/trust/test/lib/LockStateTrackingRule.kt
@@ -30,7 +30,7 @@
  */
 class LockStateTrackingRule : TestRule {
     private val context: Context = getApplicationContext()
-    private val windowManager = WindowManagerGlobal.getWindowManagerService()
+    private val windowManager = checkNotNull(WindowManagerGlobal.getWindowManagerService())
 
     @Volatile lateinit var lockState: LockState
         private set
diff --git a/tests/TrustTests/src/android/trust/test/lib/ScreenLockRule.kt b/tests/TrustTests/src/android/trust/test/lib/ScreenLockRule.kt
index 4189baa..f1edca3 100644
--- a/tests/TrustTests/src/android/trust/test/lib/ScreenLockRule.kt
+++ b/tests/TrustTests/src/android/trust/test/lib/ScreenLockRule.kt
@@ -36,7 +36,7 @@
 class ScreenLockRule : TestRule {
     private val context: Context = getApplicationContext()
     private val uiDevice = UiDevice.getInstance(getInstrumentation())
-    private val windowManager = WindowManagerGlobal.getWindowManagerService()
+    private val windowManager = checkNotNull(WindowManagerGlobal.getWindowManagerService())
     private val lockPatternUtils = LockPatternUtils(context)
     private var instantLockSavedValue = false