Hide logs behind authentication prompt

app/src/main/java/se/ajpanton/notificationlog/MainActivity.kt

@@ -39,6 +39,7 @@ class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelecte
         WindowCompat.setDecorFitsSystemWindows(window, true)
         binding = ActivityMainBinding.inflate(layoutInflater)
         setContentView(binding.root)
+        showLockedOverlay(AppLockStore(this).enabled)
         val isNightMode = resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK ==
             Configuration.UI_MODE_NIGHT_YES
         WindowInsetsControllerCompat(window, binding.root).isAppearanceLightNavigationBars = !isNightMode
@@ -84,12 +85,20 @@ class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelecte
 
     override fun onResume() {
         super.onResume()
-        if (needsUnlock && AppLockStore(this).enabled) requestUnlock()
+        if (needsUnlock && AppLockStore(this).enabled) {
+            showLockedOverlay(true)
+            requestUnlock()
+        } else {
+            showLockedOverlay(false)
+        }
     }
 
     override fun onStop() {
         super.onStop()
-        if (!isChangingConfigurations) needsUnlock = true
+        if (!isChangingConfigurations) {
+            needsUnlock = true
+            if (AppLockStore(this).enabled) showLockedOverlay(true)
+        }
     }
 
     private fun requestUnlock() {
@@ -98,11 +107,18 @@ class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelecte
             .setAllowedAuthenticators(Authenticators.BIOMETRIC_STRONG or Authenticators.DEVICE_CREDENTIAL)
             .build()
             .authenticate(CancellationSignal(), mainExecutor, object : BiometricPrompt.AuthenticationCallback() {
-                override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult?) { needsUnlock = false }
+                override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult?) {
+                    needsUnlock = false
+                    showLockedOverlay(false)
+                }
                 override fun onAuthenticationError(errorCode: Int, errString: CharSequence?) { finishAndRemoveTask() }
             })
     }
 
+    private fun showLockedOverlay(visible: Boolean) {
+        binding.lockOverlay.visibility = if (visible) View.VISIBLE else View.GONE
+    }
+
     override fun onNavigationItemSelected(item: MenuItem): Boolean {
         navigateTo(item.itemId)
         if (!permanentSidebar) {