Add warning banner after plaintext export

app/src/main/java/com/beemdevelopment/aegis/Preferences.java

@@ -316,6 +316,29 @@ public class Preferences {
         return _prefs.getBoolean("pref_backups_reminder_needed", false);
     }
 
+    public void setIsPlaintextBackupWarningNeeded(boolean needed) {
+        if (isPlaintextBackupWarningNeeded() != needed) {
+            _prefs.edit().putBoolean("pref_plaintext_backup_warning_needed", needed).apply();
+        }
+    }
+
+    public boolean isPlaintextBackupWarningNeeded() {
+        if (canShowPlaintextBackupWarning()) {
+            return _prefs.getBoolean("pref_plaintext_backup_warning_needed", false);
+        }
+        return false;
+    }
+
+    public void setCanShowPlaintextBackupWarning(boolean canShow) {
+        if (canShowPlaintextBackupWarning() != canShow) {
+            _prefs.edit().putBoolean("pref_can_show_plaintext_backup_warning", canShow).apply();
+        }
+    }
+
+    public boolean canShowPlaintextBackupWarning() {
+        return _prefs.getBoolean("pref_can_show_plaintext_backup_warning", true);
+    }
+
     public boolean isPinKeyboardEnabled() {
         return _prefs.getBoolean("pref_pin_keyboard", false);
     }

app/src/main/java/com/beemdevelopment/aegis/ui/MainActivity.java

@@ -9,14 +9,18 @@ import android.net.Uri;
 import android.os.Bundle;
 import android.provider.Settings;
 import android.view.KeyEvent;
+import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
+import android.widget.Button;
+import android.widget.CheckBox;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.view.ActionMode;
 import androidx.appcompat.widget.SearchView;
 
@@ -683,11 +687,46 @@ public class MainActivity extends AegisActivity implements EntryListView.Listene
                 startPreferencesActivity();
             });
             _btnErrorBar.setVisibility(View.VISIBLE);
+        } else if (_prefs.isPlaintextBackupWarningNeeded()) {
+            _textErrorBar.setText(R.string.backup_plaintext_export_warning);
+            _btnErrorBar.setOnClickListener(view -> {
+                showPlaintextExportWarningOptions();
+            });
+            _btnErrorBar.setVisibility(View.VISIBLE);
         } else {
             _btnErrorBar.setVisibility(View.GONE);
         }
     }
 
+    private void showPlaintextExportWarningOptions() {
+        View view = LayoutInflater.from(this).inflate(R.layout.dialog_plaintext_warning_options, null);
+
+        AlertDialog dialog = new AlertDialog.Builder(this)
+                .setTitle(R.string.backup_plaintext_export_warning)
+                .setView(view)
+                .setPositiveButton(android.R.string.ok, null)
+                .setNegativeButton(android.R.string.cancel, null)
+                .create();
+
+        CheckBox checkBox = view.findViewById(R.id.checkbox_dont_show_plaintext_warning_again);
+        checkBox.setChecked(false);
+
+        dialog.setOnShowListener(d -> {
+            Button btnPos = dialog.getButton(AlertDialog.BUTTON_POSITIVE);
+
+            btnPos.setOnClickListener(l -> {
+                dialog.dismiss();
+
+                _prefs.setCanShowPlaintextBackupWarning(!checkBox.isChecked());
+                _prefs.setIsPlaintextBackupWarningNeeded(false);
+
+                updateErrorBar();
+            });
+        });
+
+        Dialogs.showSecureDialog(dialog);
+    }
+
     @Override
     public void onEntryClick(VaultEntry entry) {
         if (_actionMode != null) {

app/src/main/java/com/beemdevelopment/aegis/ui/fragments/preferences/ImportExportPreferencesFragment.java

@@ -292,9 +292,11 @@ public class ImportExportPreferencesFragment extends PreferencesFragment {
                 break;
             case CODE_EXPORT_PLAIN:
                 cb.exportVault((stream) -> _vaultManager.getVault().export(stream, null));
+                _prefs.setIsPlaintextBackupWarningNeeded(true);
                 break;
             case CODE_EXPORT_GOOGLE_URI:
                 cb.exportVault((stream) -> _vaultManager.getVault().exportGoogleUris(stream));
+                _prefs.setIsPlaintextBackupWarningNeeded(true);
                 break;
         }
     }

app/src/main/res/layout/dialog_plaintext_warning_options.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:paddingBottom="10dp"
+    android:paddingTop="10dp">
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="25dp"
+        android:layout_marginEnd="25dp"
+        android:text="@string/backup_plaintext_warning_explanation" />
+
+    <CheckBox
+        android:id="@+id/checkbox_dont_show_plaintext_warning_again"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="20dp"
+        android:layout_marginEnd="20dp"
+        android:layout_marginTop="5dp"
+        android:text="@string/pref_show_plaintext_warning_hint"
+        android:checked="true" />
+
+</LinearLayout>

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

@@ -321,6 +321,9 @@
     <string name="google_qr_export_unexpected">Expected QR code #%d, but scanned #%d instead</string>
     <string name="backup_error_bar_message"><b>Vault backup failed recently</b></string>
     <string name="backup_reminder_bar_message"><b>Recent vault changes are not backed up</b></string>
+    <string name="backup_plaintext_export_warning"><b>The vault was recently exported in plain text</b></string>
+    <string name="pref_show_plaintext_warning_hint">Don\'t show this warning again</string>
+    <string name="backup_plaintext_warning_explanation">This warning is shown because you recently exported an unencrypted copy of the vault. To maintain security of your tokens, we recommend deleting this file once it\'s no longer needed.</string>
     <string name="switch_camera">Switch camera</string>
 
     <string name="custom_notices_format_style" translatable="false" >