android: Instantly apply screen protection (#1464)

apps/android/app/src/main/java/chat/simplex/app/views/usersettings/CallSettings.kt

@@ -80,8 +80,9 @@ private fun LockscreenOpts(lockscreenOpts: State<CallOnLockScreen>, enabled: Sta
 fun SharedPreferenceToggle(
   text: String,
   preference: SharedPreference<Boolean>,
-  preferenceState: MutableState<Boolean>? = null
-) {
+  preferenceState: MutableState<Boolean>? = null,
+  onChange: ((Boolean) -> Unit)? = null,
+  ) {
   val prefState = preferenceState ?: remember { mutableStateOf(preference.get()) }
   Row(Modifier.fillMaxWidth(), verticalAlignment = Alignment.CenterVertically) {
     Text(text, Modifier.padding(end = 24.dp))
@@ -91,6 +92,7 @@ fun SharedPreferenceToggle(
       onCheckedChange = {
         preference.set(it)
         prefState.value = it
+        onChange?.invoke(it)
       },
       colors = SwitchDefaults.colors(
         checkedThumbColor = MaterialTheme.colors.primary,

apps/android/app/src/main/java/chat/simplex/app/views/usersettings/PrivacySettings.kt

@@ -5,13 +5,17 @@ import SectionItemView
 import SectionSpacer
 import SectionTextFooter
 import SectionView
+import android.view.WindowManager
 import androidx.compose.foundation.layout.*
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.outlined.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalView
 import androidx.compose.ui.res.stringResource
+import androidx.fragment.app.FragmentActivity
 import chat.simplex.app.R
 import chat.simplex.app.model.*
 import chat.simplex.app.views.helpers.*
@@ -30,7 +34,17 @@ fun PrivacySettingsView(
     SectionView(stringResource(R.string.settings_section_title_device)) {
       ChatLockItem(chatModel.performLA, setPerformLA)
       SectionDivider()
-      SettingsPreferenceItem(Icons.Outlined.VisibilityOff, stringResource(R.string.protect_app_screen), chatModel.controller.appPrefs.privacyProtectScreen)
+      val context = LocalContext.current
+      SettingsPreferenceItem(Icons.Outlined.VisibilityOff, stringResource(R.string.protect_app_screen), chatModel.controller.appPrefs.privacyProtectScreen) { on ->
+        if (on) {
+          (context as? FragmentActivity)?.window?.setFlags(
+            WindowManager.LayoutParams.FLAG_SECURE,
+            WindowManager.LayoutParams.FLAG_SECURE
+          )
+        } else {
+          (context as? FragmentActivity)?.window?.clearFlags(WindowManager.LayoutParams.FLAG_SECURE)
+        }
+      }
     }
     SectionSpacer()
 

apps/android/app/src/main/java/chat/simplex/app/views/usersettings/SettingsView.kt

@@ -381,12 +381,18 @@ fun SettingsActionItem(icon: ImageVector, text: String, click: (() -> Unit)? = n
 }
 
 @Composable
-fun SettingsPreferenceItem(icon: ImageVector, text: String, pref: SharedPreference<Boolean>, prefState: MutableState<Boolean>? = null) {
+fun SettingsPreferenceItem(
+  icon: ImageVector,
+  text: String,
+  pref: SharedPreference<Boolean>,
+  prefState: MutableState<Boolean>? = null,
+  onChange: ((Boolean) -> Unit)? = null,
+) {
   SectionItemView {
     Row(verticalAlignment = Alignment.CenterVertically) {
       Icon(icon, text, tint = HighOrLowlight)
       Spacer(Modifier.padding(horizontal = 4.dp))
-      SharedPreferenceToggle(text, pref, prefState)
+      SharedPreferenceToggle(text, pref, prefState, onChange)
     }
   }
 }