Saving Data in Flutter

Jan 31 2024 · Dart 3, Flutter 3.10, Visual Studio Code

Part 2: Use SharedPreferences & Secure Storage

07. Connect the User Interface to the Data (Part 2)

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Previous episode: 06. Connect the User Interface to the Data (Part 1) Next episode: 08. Challenge: Add a Field

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OK, we are now ready to build the user interface for the settings screen.

Padding( 
  padding: const EdgeInsets.all(8.0), 
  child: TextField( 
    controller: _listNameController, 
    decoration: InputDecoration( 
        labelText: 'List Name', 
        labelStyle: TextStyle(fontSize: fontSize)), 
    onChanged: (value) { 
      setState(() { 
        _listName = value; 
      }); 
    }, 
  ), 
),

child: TextField( 
  controller: _caloriesController, 
  keyboardType: TextInputType.number, 
  decoration: InputDecoration( 
      labelText: 'Maximum Daily Calories', 
      labelStyle: TextStyle(fontSize: fontSize)), 
  onChanged: (value) { 
    setState(() { 
      _calories = int.tryParse(value) ?? 0; 
    }); 
  }, 
), 

SwitchListTile( 
    title: Text('Show File Size', style: TextStyle(fontSize: fontSize)), 
    value: _showFileSize, 
    onChanged: (bool value) { 
      setState(() { 
        _showFileSize = value; 
      }); 
    }, 
  ), 

final prefs = await SPHelper.getInstance(); 

await prefs.setListName(_listNameController.text); 

await prefs.setCalories(int.tryParse(_caloriesController.text) ?? 0); 

await prefs.setShowFileSize(_showFileSize); 

ScaffoldMessenger.of(context).showSnackBar( 
      const SnackBar(content: Text('Settings saved!')), 
    );