Add back protection dialog on recovery key screen.

app/src/main/java/org/thoughtcrime/securesms/backup/v2/ui/subscription/MessageBackupsKeyRecordScreen.kt

@@ -6,6 +6,8 @@
 package org.thoughtcrime.securesms.backup.v2.ui.subscription
 
 import android.content.Context
+import androidx.activity.compose.BackHandler
+import androidx.activity.compose.LocalOnBackPressedDispatcherOwner
 import androidx.annotation.UiContext
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
@@ -94,6 +96,10 @@ fun MessageBackupsKeyRecordScreen(
     backupKey.chunked(4).joinToString("  ")
   }
 
+  if (mode is MessageBackupsKeyRecordMode.Next) {
+    RecordScreenBackHandler()
+  }
+
   Scaffolds.Settings(
     title = "",
     navigationIcon = ImageVector.vectorResource(R.drawable.symbol_arrow_start_24),
@@ -338,6 +344,38 @@ private fun BackupKeySaveErrorDialog(
   }
 }
 
+@Composable
+private fun RecordScreenBackHandler() {
+  var displayWarningDialog by remember { mutableStateOf(false) }
+  var didConfirmDialog by remember { mutableStateOf(false) }
+  val backPressedDispatcher = LocalOnBackPressedDispatcherOwner.current?.onBackPressedDispatcher
+
+  BackHandler(enabled = !didConfirmDialog) {
+    displayWarningDialog = true
+  }
+
+  LaunchedEffect(didConfirmDialog, backPressedDispatcher) {
+    if (didConfirmDialog) {
+      backPressedDispatcher?.onBackPressed()
+    }
+  }
+
+  if (displayWarningDialog) {
+    Dialogs.SimpleAlertDialog(
+      title = stringResource(R.string.MessageBackupsKeyRecordScreen__exit_backup_setup),
+      body = stringResource(R.string.MessageBackupsKeyRecordScreen__you_have_not_finished_setting_up_backups),
+      confirm = stringResource(R.string.MessageBackupsKeyRecordScreen__exit_backup_setup_confirm),
+      dismiss = stringResource(android.R.string.cancel),
+      onConfirm = {
+        didConfirmDialog = true
+      },
+      onDismiss = {
+        displayWarningDialog = false
+      }
+    )
+  }
+}
+
 @Composable
 private fun ColumnScope.CreateNewBackupKeySheetContent(
   onContinueClick: () -> Unit = {},

app/src/main/res/values/strings.xml

@@ -8513,6 +8513,12 @@
     <string name="MessageBackupsKeyRecordScreen__create_a_new_backup_key">Create a new recovery key</string>
     <!-- Bottom Sheet body for creating a new AEP key -->
     <string name="MessageBackupsKeyRecordScreen__creating_a_new_key_is_only_necessary">Creating a new key is only necessary if someone else knows your key. You will have to re-upload your backup, including media. If you are using \"Optimize storage\" you will have to download offloaded media first.</string>
+    <!-- Dialog title shown when user attempts to exit backup setup before completion -->
+    <string name="MessageBackupsKeyRecordScreen__exit_backup_setup">Exit backup setup?</string>
+    <!-- Dialog body warning user that backup setup is incomplete -->
+    <string name="MessageBackupsKeyRecordScreen__you_have_not_finished_setting_up_backups">You have not finished setting up backups, and no backup has been created. You can enable backups in Settings.</string>
+    <!-- Dialog confirmation button to exit backup setup -->
+    <string name="MessageBackupsKeyRecordScreen__exit_backup_setup_confirm">Exit backup setup</string>
 
     <!-- BackupKeyDisplayFragment -->
     <!-- Dialog title when exiting before confirming new key -->