Fix some nullability errors when calling Android APIs.

Bug: 344882050
Test: N/A

Change-Id: I14e6eec68d199267cb63e07fed928016c3d47c83
diff --git a/health/connect/connect-client/src/main/java/androidx/health/connect/client/HealthConnectClient.kt b/health/connect/connect-client/src/main/java/androidx/health/connect/client/HealthConnectClient.kt
index e4a1e12..a5e0b5c 100644
--- a/health/connect/connect-client/src/main/java/androidx/health/connect/client/HealthConnectClient.kt
+++ b/health/connect/connect-client/src/main/java/androidx/health/connect/client/HealthConnectClient.kt
@@ -480,7 +480,7 @@
                 } catch (e: PackageManager.NameNotFoundException) {
                     return false
                 }
-            return packageInfo.applicationInfo.enabled &&
+            return (packageInfo.applicationInfo?.enabled == true) &&
                 (packageName != DEFAULT_PROVIDER_PACKAGE_NAME ||
                     PackageInfoCompat.getLongVersionCode(packageInfo) >= versionCode) &&
                 hasBindableService(packageManager, packageName)
diff --git a/health/connect/connect-client/src/main/java/androidx/health/connect/client/impl/HealthConnectClientUpsideDownImpl.kt b/health/connect/connect-client/src/main/java/androidx/health/connect/client/impl/HealthConnectClientUpsideDownImpl.kt
index 63c020f..7c0c569 100644
--- a/health/connect/connect-client/src/main/java/androidx/health/connect/client/impl/HealthConnectClientUpsideDownImpl.kt
+++ b/health/connect/connect-client/src/main/java/androidx/health/connect/client/impl/HealthConnectClientUpsideDownImpl.kt
@@ -337,12 +337,14 @@
             .getPackageInfo(context.packageName, PackageInfoFlags.of(GET_PERMISSIONS.toLong()))
             .let {
                 return buildSet {
-                    for (i in it.requestedPermissions.indices) {
+                    val requestedPermissions = it.requestedPermissions ?: emptyArray()
+                    for (i in requestedPermissions.indices) {
                         if (
-                            it.requestedPermissions[i].startsWith(PERMISSION_PREFIX) &&
-                                it.requestedPermissionsFlags[i] and REQUESTED_PERMISSION_GRANTED > 0
+                            requestedPermissions[i].startsWith(PERMISSION_PREFIX) &&
+                                it.requestedPermissionsFlags!![i] and REQUESTED_PERMISSION_GRANTED >
+                                    0
                         ) {
-                            add(it.requestedPermissions[i])
+                            add(requestedPermissions[i])
                         }
                     }
                 }
@@ -350,12 +352,14 @@
     }
 
     override suspend fun revokeAllPermissions() {
-        val allHealthPermissions =
+        val requestedPermissions =
             context.packageManager
                 .getPackageInfo(context.packageName, PackageInfoFlags.of(GET_PERMISSIONS.toLong()))
-                .requestedPermissions
-                .filter { it.startsWith(PERMISSION_PREFIX) }
-        revokePermissionsFunction(allHealthPermissions)
+                .requestedPermissions ?: emptyArray()
+        val allHealthPermissions = requestedPermissions.filter { it.startsWith(PERMISSION_PREFIX) }
+        if (allHealthPermissions.isNotEmpty()) {
+            revokePermissionsFunction(allHealthPermissions)
+        }
     }
 
     private suspend fun <T> wrapPlatformException(function: suspend () -> T): T {