diff --git a/app/build.gradle b/app/build.gradle
index 1909d89b9..1dcf5bcf9 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -26,13 +26,13 @@ apply plugin: 'com.google.firebase.crashlytics'
 
 android {
     namespace 'me.zhanghai.android.files'
-    buildToolsVersion = '34.0.0'
-    compileSdk 34
-    ndkVersion '26.3.11579264'
+    buildToolsVersion = '35.0.0'
+    compileSdk 35
+    ndkVersion '27.1.12297006'
     defaultConfig {
         applicationId 'me.zhanghai.android.files'
         minSdk 21
-        // Not supporting notification runtime permission yet.
+        // Not supporting foreground service timeout yet.
         //noinspection OldTargetApi
         targetSdk 34
         versionCode 39
diff --git a/app/src/main/java/me/zhanghai/android/files/coil/VideoFrameFetcher.kt b/app/src/main/java/me/zhanghai/android/files/coil/VideoFrameFetcher.kt
index 6600823d6..d18005b03 100644
--- a/app/src/main/java/me/zhanghai/android/files/coil/VideoFrameFetcher.kt
+++ b/app/src/main/java/me/zhanghai/android/files/coil/VideoFrameFetcher.kt
@@ -122,7 +122,7 @@ class VideoFrameFetcher(
             } else {
                 outBitmap.width == width && outBitmap.height == height
             }
-            val isValidConfig = !outBitmap.config.isHardware || options.config.isHardware
+            val isValidConfig = outBitmap.config?.isHardware != true || options.config.isHardware
             val bitmap = if (isValidSize && isValidConfig) {
                 outBitmap
             } else {
diff --git a/app/src/main/java/me/zhanghai/android/files/fileproperties/apk/ApkInfoLiveData.kt b/app/src/main/java/me/zhanghai/android/files/fileproperties/apk/ApkInfoLiveData.kt
index 21fb87951..85c2c4df0 100644
--- a/app/src/main/java/me/zhanghai/android/files/fileproperties/apk/ApkInfoLiveData.kt
+++ b/app/src/main/java/me/zhanghai/android/files/fileproperties/apk/ApkInfoLiveData.kt
@@ -49,11 +49,11 @@ class ApkInfoLiveData(path: Path) : PathObserverLiveData<Stateful<ApkInfo>>(path
                     val signingCertificates = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
                         // PackageInfo.signatures returns only the oldest certificate if there are
                         // past certificates on P and above for compatibility.
-                        packageInfo.signingInfo.apkContentsSigners ?: emptyArray()
+                        packageInfo.signingInfo?.apkContentsSigners
                     } else {
                         @Suppress("DEPRECATION")
                         packageInfo.signatures
-                    }
+                    } ?: emptyArray()
                     val signingCertificateDigests = signingCertificates
                         .map { it.toByteArray().sha1Digest().toHexString() }
                     val pastSigningCertificates =
@@ -61,7 +61,7 @@ class ApkInfoLiveData(path: Path) : PathObserverLiveData<Stateful<ApkInfo>>(path
                             val signingInfo = packageInfo.signingInfo
                             // SigningInfo.getSigningCertificateHistory() may return the current
                             // certificate if there are no past certificates.
-                            if (signingInfo.hasPastSigningCertificates()) {
+                            if (signingInfo?.hasPastSigningCertificates() == true) {
                                 // SigningInfo.getSigningCertificateHistory() also returns the
                                 // current certificate.
                                 signingInfo.signingCertificateHistory?.toMutableList()
diff --git a/app/src/main/java/me/zhanghai/android/files/fileproperties/apk/FilePropertiesApkTabFragment.kt b/app/src/main/java/me/zhanghai/android/files/fileproperties/apk/FilePropertiesApkTabFragment.kt
index 1124433cb..50f29ce8b 100644
--- a/app/src/main/java/me/zhanghai/android/files/fileproperties/apk/FilePropertiesApkTabFragment.kt
+++ b/app/src/main/java/me/zhanghai/android/files/fileproperties/apk/FilePropertiesApkTabFragment.kt
@@ -49,7 +49,7 @@ class FilePropertiesApkTabFragment : FilePropertiesTabFragment() {
                     packageInfo.longVersionCodeCompat
                 )
             )
-            val applicationInfo = packageInfo.applicationInfo
+            val applicationInfo = packageInfo.applicationInfo!!
             // PackageParser didn't return minSdkVersion before N, so it's hard to implement a
             // compat version.
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
@@ -77,7 +77,7 @@ class FilePropertiesApkTabFragment : FilePropertiesTabFragment() {
                 } else {
                     {
                         PermissionListDialogFragment.show(
-                            packageInfo.requestedPermissions, this@FilePropertiesApkTabFragment
+                            packageInfo.requestedPermissions!!, this@FilePropertiesApkTabFragment
                         )
                     }
                 }
diff --git a/app/src/main/java/me/zhanghai/android/files/nonfree/CrashlyticsInitializer.kt b/app/src/main/java/me/zhanghai/android/files/nonfree/CrashlyticsInitializer.kt
index e613f5eb6..d2dc3a4e0 100644
--- a/app/src/main/java/me/zhanghai/android/files/nonfree/CrashlyticsInitializer.kt
+++ b/app/src/main/java/me/zhanghai/android/files/nonfree/CrashlyticsInitializer.kt
@@ -9,12 +9,12 @@ import android.annotation.SuppressLint
 import android.content.pm.PackageManager
 import android.content.pm.Signature
 import com.google.firebase.crashlytics.FirebaseCrashlytics
+import java.security.MessageDigest
+import java.security.NoSuchAlgorithmException
 import me.zhanghai.android.files.BuildConfig
 import me.zhanghai.android.files.app.application
 import me.zhanghai.android.files.app.packageManager
 import me.zhanghai.android.files.util.getPackageInfoOrNull
-import java.security.MessageDigest
-import java.security.NoSuchAlgorithmException
 
 object CrashlyticsInitializer {
     private val HEX_CHARS = "0123456789ABCDEF".toCharArray()
@@ -39,9 +39,10 @@ object CrashlyticsInitializer {
         val packageInfo = packageManager.getPackageInfoOrNull(
             application.packageName, PackageManager.GET_SIGNATURES
         ) ?: return false
-        return packageInfo.signatures.size == 1
-            && computeCertificateFingerprint(packageInfo.signatures[0]) == ("87:3B:9B:60:C7:7C:F7"
-            + ":F3:CD:5F:AE:66:D0:FE:11:2C:4A:86:97:3E:11:8E:E8:A2:9C:34:6C:4C:67:3C:97:F0")
+        val signatures = packageInfo.signatures ?: return false
+        return signatures.size == 1 &&
+            computeCertificateFingerprint(signatures[0]) == "87:3B:9B:60:C7:7C:F7:F3:CD:5F:AE:66" +
+                ":D0:FE:11:2C:4A:86:97:3E:11:8E:E8:A2:9C:34:6C:4C:67:3C:97:F0"
     }
 
     private fun computeCertificateFingerprint(certificate: Signature): String {