adaptive_image_picker #

The modern, zero-permission, all-in-one Flutter media picker.
Built from scratch with native Android 13+ Photo Picker, iOS 14+ PHPicker, pure-Dart interactive gesture cropper with circular avatar masks, binary-search target-size compressor, and adaptive modal sheets.

📑 Table of Contents #

Why Choose adaptive_image_picker?
Key Features
Zero-Permission Architecture
Quick Start
Platform Setup
Comprehensive Recipes & Code Examples
Feature Comparison Matrix
API Reference
FAQ & Troubleshooting
License

💡 Why Choose `adaptive_image_picker`? #

Traditional Flutter image pickers rely on legacy Android storage permissions (READ_EXTERNAL_STORAGE / READ_MEDIA_IMAGES) and outdated iOS library permissions (NSPhotoLibraryUsageDescription), leading to Play Store review rejections, privacy warnings, and inconsistent native cropper dependencies.

adaptive_image_picker solves this completely:

Zero Permissions for Gallery: Uses Android 13+ Photo Picker (MediaStore.ACTION_PICK_IMAGES, backported to Android 4.4 via Google Play Services) and iOS 14+ PHPickerViewController. No privacy declarations needed.
Pure-Dart Interactive Cropping: Pinch-to-zoom, pan, rule-of-thirds grid, circle masks, 90° rotation, and flips with zero native C++/Gradle/CocoaPods dependencies.
Guaranteed Byte Size Limits: Enforces strict payload limits (e.g. < 200 KB or < 1.5 MB) via an intelligent binary search compression and downscaling algorithm.
All Platforms Supported: Seamless, unified Dart API across Android, iOS, Web, macOS, Windows, and Linux.

✨ Key Features #

🔒 Zero-Permission Gallery: Native out-of-process photo selection requiring zero runtime storage permissions.
📸 Camera Integration: Automated FileProvider on Android and UIImagePickerController on iOS.
✂️ Pure-Dart Interactive Cropper:
- Touch gesture pinch, zoom, pan, and handle dragging.
- Circular avatar masking with antialiased alpha transparency.
- Preset aspect ratios: 1:1, 16:9, 4:3, 3:2, 9:16, Original, Freeform, and Custom.
- 90° clockwise rotation and horizontal/vertical flipping.
- Rule-of-thirds alignment grid.
🗜️ Smart Target-Size Compressor:
- Binary search convergence guaranteeing file size strictly $\le$ maxBytes.
- Format conversions: WebP, JPEG, PNG, or preserve original format.
- Automatic EXIF orientation normalization.
🌐 Remote Image Downloader: Import and transform images directly from URLs (e.g. Unsplash, CDN, cloud).
📱 Adaptive UI Design: Cupertino Action Sheets on iOS, Material 3 Bottom Sheets on Android, and responsive modal dialogs on Web/Desktop.

🏛️ Zero-Permission Architecture #

flowchart TD
    API[AdaptiveImagePicker] --> Selector{Source Selection}
    
    Selector -->|Gallery| NativePicker[Zero-Permission PhotoPicker]
    Selector -->|Camera| NativeCamera[Native Camera Capture]
    Selector -->|URL / Cloud| CloudDownloader[HTTP Downloader & Streamer]
    
    NativePicker -->|Android 13+| AndroidPicker[MediaStore.ACTION_PICK_IMAGES]
    NativePicker -->|iOS 14+| IOSPicker[PHPickerViewController]
    NativePicker -->|Web| WebPicker[HTML File Input & FileReader]
    
    AndroidPicker --> Raw[AdaptiveFile]
    IOSPicker --> Raw
    WebPicker --> Raw
    NativeCamera --> Raw
    CloudDownloader --> Raw
    
    Raw --> Pipeline{Processing Pipeline}
    
    Pipeline -->|Interactive Touch Crop| Cropper[ImageCropperEngine & AdaptiveCropView]
    Pipeline -->|Target-Size Optimization| Compressor[ImageCompressor Binary Search]
    
    Cropper --> Compressor
    Compressor --> Output[Optimized AdaptiveFile Result]

🚀 Quick Start #

Installation #

Add adaptive_image_picker to your pubspec.yaml:

dependencies:
  adaptive_image_picker: ^1.0.0

Or install via terminal:

flutter pub add adaptive_image_picker

Basic Example (One-Liner) #

import 'package:flutter/material.dart';
import 'package:adaptive_image_picker/adaptive_image_picker.dart';

// Pick an image from gallery with zero permissions
final AdaptiveFile? file = await AdaptiveImagePicker.pickImage();

if (file != null) {
  print('Picked ${file.name} (${file.formattedSize})');
}

⚙️ Platform Setup #

iOS Setup #

Gallery Selection: Zero configuration required! iOS 14+ uses PHPickerViewController, which does not require NSPhotoLibraryUsageDescription.
Camera Capture (Optional): If you enable ImageSource.camera, add the camera description to ios/Runner/Info.plist:

<key>NSCameraUsageDescription</key>
<string>This app requires access to the camera to take profile photos.</string>

Android Setup #

Gallery Selection: Zero configuration required! Automatically leverages Android 13+ Photo Picker (MediaStore.ACTION_PICK_IMAGES) with backward compatibility to Android 4.4 KitKat via Google Play Services.
Camera Capture (Optional): adaptive_image_picker automatically declares the internal FileProvider and <queries> block in its plugin manifest. No manual Android manifest modifications required.

Web Setup #

Zero configuration required. Web uses standard HTML <input type="file"> and FileReader APIs via package:web.

📖 Comprehensive Recipes & Code Examples #

Presents an OS-adaptive modal bottom sheet (Cupertino on iOS, Material 3 on Android):

final AdaptiveFile? file = await AdaptiveImagePicker.showPickerModal(
  context: context,
  options: const PickerOptions(
    modalTitle: 'Select Photo Source',
    sources: [ImageSource.camera, ImageSource.gallery, ImageSource.url],
  ),
  cropOptions: const CropOptions(title: 'Crop Photo'),
  compressionOptions: CompressionOptions.webOptimized(
    maxBytes: 500 * 1024, // <= 500 KB
  ),
);

2. Pick Single Image with Aspect Ratio Crop & Compression #

final AdaptiveFile? file = await AdaptiveImagePicker.pickImage(
  source: ImageSource.gallery,
  context: context,
  cropOptions: const CropOptions(
    title: '16:9 Banner Crop',
    aspectRatioPreset: CropAspectRatio.ratio16x9,
    lockAspectRatio: true,
    showGrid: true,
  ),
  compressionOptions: const CompressionOptions(
    maxBytes: 350 * 1024, // Compresses strictly under 350 KB
    format: OutputFormat.webp,
  ),
);

3. Profile Avatar Flow (Circle Mask + WebP Target Size) #

Picks an image, locks circular avatar crop with antialiased alpha transparency, and downscales to under 100 KB:

final AdaptiveFile? avatar = await AdaptiveImagePicker.pickImage(
  source: ImageSource.gallery,
  context: context,
  cropOptions: CropOptions.circle(
    title: 'Set Profile Avatar',
  ),
  compressionOptions: CompressionOptions.avatar(
    maxBytes: 100 * 1024, // Strictly <= 100 KB
  ),
);

4. Multi-Image Selection with Batch Compression #

Picks multiple photos concurrently and applies batch compression:

final List<AdaptiveFile> files = await AdaptiveImagePicker.pickMultiple(
  maxCount: 5,
  compressionOptions: const CompressionOptions(
    quality: 85,
    format: OutputFormat.webp,
    maxWidth: 1920,
    maxHeight: 1080,
  ),
);

for (final file in files) {
  print('${file.name}: ${file.formattedSize}');
}

5. Standalone Interactive Cropper View #

Open the gesture cropper on any existing AdaptiveFile:

final AdaptiveFile? cropped = await AdaptiveImagePicker.cropImage(
  file: existingFile,
  context: context,
  options: const CropOptions(
    showGrid: true,
    allowRotation: true,
    allowFlipping: true,
    availableAspectRatios: [
      CropAspectRatio.free,
      CropAspectRatio.ratio1x1,
      CropAspectRatio.ratio4x3,
      CropAspectRatio.ratio16x9,
    ],
  ),
);

6. Strict Target-Size Compressor (Binary Search) #

Guarantees output file size strictly adheres to the byte limit:

final AdaptiveFile compressed = await AdaptiveImagePicker.compressImage(
  file: largeFile,
  options: CompressionOptions.targetSize(
    150 * 1024, // Output will strictly be <= 150 KB
    format: OutputFormat.webp,
  ),
);

print('Optimized from ${largeFile.formattedSize} to ${compressed.formattedSize}');

7. Import Image from Remote URL & Transform #

Download directly from web/cloud, crop, and compress in one call:

final AdaptiveFile file = await AdaptiveImagePicker.fromUrl(
  'https://picsum.photos/800/600',
  context: context,
  cropOptions: const CropOptions(
    shape: CropShape.circle,
    aspectRatioPreset: CropAspectRatio.ratio1x1,
  ),
  compressionOptions: const CompressionOptions(
    maxBytes: 200 * 1024,
    format: OutputFormat.webp,
  ),
);

8. Save to Local App Storage or Device Gallery (Photos App) #

A. Save to App Local Filesystem (Built-in)

import 'package:path_provider/path_provider.dart';

final dir = await getApplicationDocumentsDirectory();

// Save directly with file.name into directory
final AdaptiveFile savedFile = await file.saveToDirectory(dir.path);
print('Saved at: ${savedFile.path}');

B. Save to User's Native Device Gallery / Photos App

Pair with the lightweight gal package:

import 'package:gal/gal.dart';

if (file.path != null) {
  await Gal.putImage(file.path!);
} else {
  final bytes = await file.readAsBytes();
  await Gal.putImageBytes(bytes, name: file.name);
}

C. Upload to Cloud Backend (Firebase / Supabase / AWS S3)

final Uint8List bytes = await file.readAsBytes();

// Example HTTP Multipart upload
final request = http.MultipartRequest('POST', Uri.parse('https://your-api.com/upload'))
  ..files.add(http.MultipartFile.fromBytes(
    'file',
    bytes,
    filename: file.name,
    contentType: MediaType.parse(file.mimeType ?? 'image/jpeg'),
  ));
final response = await request.send();

You can completely customize the visual appearance of bottom sheets, dialogs, and the cropper interface:

A. Custom `PickerTheme`

final file = await AdaptiveImagePicker.showPickerModal(
  context: context,
  options: PickerOptions(
    modalTitle: 'Choose Profile Image',
    theme: PickerTheme(
      backgroundColor: const Color(0xFF1E1E24),
      tileBackgroundColor: const Color(0xFF2A2A32),
      titleTextStyle: const TextStyle(
        color: Colors.white,
        fontSize: 18,
        fontWeight: FontWeight.bold,
      ),
      cameraIconColor: Colors.deepOrangeAccent,
      galleryIconColor: Colors.tealAccent,
      urlIconColor: Colors.purpleAccent,
      borderRadius: const BorderRadius.vertical(top: Radius.circular(32)),
      tileBorderRadius: BorderRadius.circular(18),
    ),
  ),
  cropOptions: const CropOptions(
    toolbarColor: Color(0xFF1E1E24),
    backgroundColor: Color(0xFF121214),
    activeHandleColor: Colors.deepOrangeAccent,
    gridColor: Colors.white24,
  ),
);

B. 100% Custom Modal Builder (`customModalBuilder`)

If you want to render your own proprietary UI layout for source selection:

final file = await AdaptiveImagePicker.showPickerModal(
  context: context,
  options: PickerOptions(
    customModalBuilder: (context, options, onSelectSource) {
      return Container(
        padding: const EdgeInsets.all(24),
        decoration: BoxDecoration(
          color: Theme.of(context).colorScheme.surface,
          borderRadius: const BorderRadius.vertical(top: Radius.circular(32)),
        ),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
          children: [
            IconButton(
              icon: const Icon(Icons.camera_alt_rounded, size: 32),
              onPressed: () => onSelectSource(ImageSource.camera),
            ),
            IconButton(
              icon: const Icon(Icons.photo_library_rounded, size: 32),
              onPressed: () => onSelectSource(ImageSource.gallery),
            ),
            IconButton(
              icon: const Icon(Icons.link_rounded, size: 32),
              onPressed: () => onSelectSource(ImageSource.url),
            ),
          ],
        ),
      );
    },
  ),
);

📊 Feature Comparison Matrix #

Feature	`adaptive_image_picker`	`image_picker`	`image_cropper`	`flutter_image_compress`
Zero-Permission Gallery (Android 13+ / iOS 14+)	✅ Yes	⚠️ Partial	❌ N/A	❌ N/A
Pure-Dart Gesture Cropper	✅ Yes	❌ No	❌ Native Only	❌ N/A
Circular Profile Avatar Mask	✅ Yes	❌ No	⚠️ OS Dependent	❌ N/A
Strict Target-Size Compression	✅ Guaranteed	❌ No	❌ No	❌ No
WebP / JPEG / PNG Conversions	✅ Yes	❌ No	❌ No	⚠️ Partial
Adaptive Cupertino/Material Sheet	✅ Built-in	❌ No	❌ No	❌ N/A
Direct Remote URL Downloader	✅ Built-in	❌ No	❌ No	❌ No
Zero Native Gradle / Pod Conflicts	✅ Pure Dart Engine	⚠️ Complex	❌ CocoaPod heavy	❌ Native C++

🛠️ API Reference #

`AdaptiveFile` #

Property / Method	Type	Description
`name`	`String`	File name with extension (e.g. `"avatar.webp"`).
`size`	`int?`	File size in bytes.
`formattedSize`	`String`	Human-readable size (`"1.4 MB"`, `"350 KB"`).
`width` / `height`	`int?`	Image dimensions in pixels.
`aspectRatio`	`double?`	Calculated aspect ratio (`width / height`).
`path`	`String?`	Local filesystem path (null on Web/in-memory).
`bytes`	`Uint8List?`	In-memory byte buffer (if cached).
`readAsBytes()`	`Future<Uint8List>`	Reads file bytes asynchronously.
`saveTo(destPath)`	`Future<AdaptiveFile>`	Writes bytes to disk on IO platforms.
`saveToDirectory(dir)`	`Future<AdaptiveFile>`	Saves file using its name into a folder.
`delete()`	`Future<bool>`	Deletes file from local storage if exists.

`CropOptions` #

Property	Type	Default	Description
`shape`	`CropShape`	`.rectangle`	`rectangle` or `circle` avatar mask.
`aspectRatioPreset`	`CropAspectRatio`	`.free`	Preset ratio (`1:1`, `16:9`, `4:3`, `3:2`, `9:16`, `free`).
`lockAspectRatio`	`bool`	`false`	Enforce locked aspect ratio.
`showGrid`	`bool`	`true`	Show rule-of-thirds grid overlay.
`allowRotation`	`bool`	`true`	Enable 90° clockwise rotation button.
`allowFlipping`	`bool`	`true`	Enable horizontal/vertical flip buttons.

`CompressionOptions` #

Property	Type	Default	Description
`maxBytes`	`int?`	`null`	Exact target byte limit enforced by binary search.
`quality`	`int`	`85`	Starting quality factor (1 - 100).
`maxWidth` / `maxHeight`	`int?`	`null`	Maximum output pixel dimensions.
`format`	`OutputFormat`	`.preserve`	Target format (`webp`, `jpeg`, `png`, `preserve`).
`autoOrientation`	`bool`	`true`	Automatically bake EXIF orientation.

❓ FAQ & Troubleshooting #

Q: Why doesn't iOS ask for photo library permissions?

A: adaptive_image_picker uses PHPickerViewController on iOS 14+, which runs out-of-process in a separate system service. The app only receives access to the specific images selected by the user.

Q: Why doesn't Android ask for `READ_MEDIA_IMAGES` or `READ_EXTERNAL_STORAGE`?

A: Android 13+ introduced the system Photo Picker (MediaStore.ACTION_PICK_IMAGES). Google backported this to Android 4.4 via Google Play Services. It grants temporary read access without granting broad storage access.

Q: Can I run compression and cropping in background isolates?

A: Yes! The pure-Dart engines use Flutter's compute isolate runner automatically for intensive operations to keep the UI smooth at 60/120 fps.

📄 License #

This project is licensed under the MIT License - see the LICENSE file for details.

adaptive_image_picker 1.0.1 adaptive_image_picker: ^1.0.1 copied to clipboard

Metadata

adaptive_image_picker #

📑 Table of Contents #

💡 Why Choose adaptive_image_picker? #

✨ Key Features #

🏛️ Zero-Permission Architecture #

🚀 Quick Start #

Installation #

Basic Example (One-Liner) #

⚙️ Platform Setup #

iOS Setup #

Android Setup #

Web Setup #

📖 Comprehensive Recipes & Code Examples #

1. Launch Adaptive Action Sheet Modal (Camera, Gallery, URL) #

2. Pick Single Image with Aspect Ratio Crop & Compression #

3. Profile Avatar Flow (Circle Mask + WebP Target Size) #

4. Multi-Image Selection with Batch Compression #

5. Standalone Interactive Cropper View #

6. Strict Target-Size Compressor (Binary Search) #

7. Import Image from Remote URL & Transform #

8. Save to Local App Storage or Device Gallery (Photos App) #

A. Save to App Local Filesystem (Built-in)

B. Save to User's Native Device Gallery / Photos App

C. Upload to Cloud Backend (Firebase / Supabase / AWS S3)

9. Full UI Theming & Custom Modal Builder #

A. Custom PickerTheme

B. 100% Custom Modal Builder (customModalBuilder)

📊 Feature Comparison Matrix #

🛠️ API Reference #

AdaptiveFile #

CropOptions #

CompressionOptions #

❓ FAQ & Troubleshooting #

Q: Why doesn't iOS ask for photo library permissions?

Q: Why doesn't Android ask for READ_MEDIA_IMAGES or READ_EXTERNAL_STORAGE?

Q: Can I run compression and cropping in background isolates?

📄 License #

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