diff --git a/app/src/main/java/com/hippo/ehviewer/ui/EhActivity.kt b/app/src/main/java/com/hippo/ehviewer/ui/EhActivity.kt
index 00c13933e..293fcbd4f 100644
--- a/app/src/main/java/com/hippo/ehviewer/ui/EhActivity.kt
+++ b/app/src/main/java/com/hippo/ehviewer/ui/EhActivity.kt
@@ -35,7 +35,6 @@ import com.hippo.ehviewer.EhApplication
 import com.hippo.ehviewer.EhApplication.locked_last_leave_time
 import com.hippo.ehviewer.R
 import com.hippo.ehviewer.Settings
-import com.hippo.ehviewer.ui.SecurityActivity.Companion.isAuthenticationSupported
 import rikka.core.res.resolveColor
 import rikka.insets.WindowInsetsHelper
 import rikka.layoutinflater.view.LayoutInflaterFactory
@@ -72,7 +71,6 @@ abstract class EhActivity : AppCompatActivity() {
                 WindowInsetsHelper.LISTENER
             )
         super.onCreate(savedInstanceState)
-        val window = window
         window.statusBarColor = Color.TRANSPARENT
         window.decorView.post {
             val rootWindowInsets = window.decorView.rootWindowInsets
@@ -104,7 +102,7 @@ abstract class EhActivity : AppCompatActivity() {
         val locked_resume_time = System.currentTimeMillis() / 1000
         val locked_delay_time = locked_resume_time - locked_last_leave_time
         if (Settings.getSecurity() && locked_delay_time >= Settings.getSecurityDelay() * 60
-            && isAuthenticationSupported(this) && EhApplication.locked
+            && isAuthenticationSupported() && EhApplication.locked
         ) {
             startActivity(Intent(this, SecurityActivity::class.java))
         }
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/SecurityActivity.kt b/app/src/main/java/com/hippo/ehviewer/ui/SecurityActivity.kt
index 0a5de95b5..e417c22e6 100755
--- a/app/src/main/java/com/hippo/ehviewer/ui/SecurityActivity.kt
+++ b/app/src/main/java/com/hippo/ehviewer/ui/SecurityActivity.kt
@@ -30,10 +30,16 @@ import androidx.fragment.app.FragmentActivity
 import com.hippo.ehviewer.EhApplication
 import com.hippo.ehviewer.R
 
+fun Context.isAuthenticationSupported(): Boolean {
+    val authenticators = BiometricManager.Authenticators.BIOMETRIC_WEAK or DEVICE_CREDENTIAL
+    return BiometricManager.from(this)
+        .canAuthenticate(authenticators) == BiometricManager.BIOMETRIC_SUCCESS
+}
+
 class SecurityActivity : AppCompatActivity() {
     override fun onResume() {
         super.onResume()
-        if (isAuthenticationSupported(this))
+        if (isAuthenticationSupported())
             startAuthentication(getString(R.string.settings_privacy_require_unlock))
         else
             onSuccess()
@@ -70,14 +76,6 @@ class SecurityActivity : AppCompatActivity() {
         }
     }
 
-    companion object {
-        fun isAuthenticationSupported(context: Context): Boolean {
-            val authenticators = BiometricManager.Authenticators.BIOMETRIC_WEAK or DEVICE_CREDENTIAL
-            return BiometricManager.from(context)
-                .canAuthenticate(authenticators) == BiometricManager.BIOMETRIC_SUCCESS
-        }
-    }
-
     private fun onSuccess() {
         EhApplication.locked = false
         finish()
diff --git a/app/src/main/java/com/hippo/ehviewer/ui/fragment/PrivacyFragment.kt b/app/src/main/java/com/hippo/ehviewer/ui/fragment/PrivacyFragment.kt
index 670b2ecaa..05cb540a1 100644
--- a/app/src/main/java/com/hippo/ehviewer/ui/fragment/PrivacyFragment.kt
+++ b/app/src/main/java/com/hippo/ehviewer/ui/fragment/PrivacyFragment.kt
@@ -23,7 +23,7 @@ import androidx.preference.SeekBarPreference
 import androidx.preference.SwitchPreferenceCompat
 import com.hippo.ehviewer.R
 import com.hippo.ehviewer.Settings
-import com.hippo.ehviewer.ui.SecurityActivity.Companion.isAuthenticationSupported
+import com.hippo.ehviewer.ui.isAuthenticationSupported
 
 /**
  * Created by Mo10 on 2018/2/10.
@@ -48,7 +48,7 @@ class PrivacyFragment : BasePreferenceFragment() {
 
     override fun onStart() {
         super.onStart()
-        if (!isAuthenticationSupported(requireContext())) {
+        if (!requireContext().isAuthenticationSupported()) {
             Settings.putSecurity(false)
             requireUnlock.isEnabled = false
             requireUnlock.isChecked = false