Paulonia Cache Image #

Flutter package for download and store images in the cache. It supports in-memory and storage cache in Android, iOS and Web for network and Google Cloud Storage images.

Usage #

To use this package add paulonia_cache_image as a dependency in your pubspec.yaml file.

You have to initialize the package in your main() function:

void main() async{
  WidgetsFlutterBinding.ensureInitialized();
  await PCacheImage.init();
  runApp(MyApp());
}

Paulonia cache image extends ImageProvider, so you can use it with any widget that supports an ImageProvider only with the URL. By default, the image is cached in the platform storage:

Image(
  image: PCacheImage('https://i.imgur.com/jhRBVEp.jpg')
);
Image(
  image: PCacheImage(
    'gs://flutter-template-44674.appspot.com/images/user/0ooAw4dX5AeGhkH1JYkoWcdwvc72_big.jpg',
  )
);

In-memory cache #

With the default image cache in the platform storage there is a problem: when you make a setState() the package reads the storage and retrieve the image, this process causes the image to flicker!. With in-memory cache, this process is more quickly and there is no flicker. You can enable it as follows:

Image(
  image: PCacheImage('https://i.imgur.com/jhRBVEp.jpg', enableInMemory: true)
);

Use only where your require. The problem with this approach is the memory usage increase. We recommend use only with images in widgets that run setState(), to erase the flicker.

CORS on web #

On the web when you try to make a request and download an image, it can throw an error with the CORS. Depends on the image type there is a solution:

Google Storage Images #

You must to enable CORS in your bucket

Network Images #

You can set a proxy in the init() function:

void main() async{
  WidgetsFlutterBinding.ensureInitialized();
  await PCacheImage.init(proxy: "https://cors-anywhere.herokuapp.com/");
  runApp(MyApp());
}

The proxy property is only used with network image in the way: "https://cors-anywhere.herokuapp.com/http://image.jpg".

Properties #

PCacheImage has the follow properties:

Author #

This packaged was made by ChrisChV and is used in all Paulonia projects.