media_cache_manager

Helps you to cache and encrypt media (Audio, Video, Image, etc...) Permanently or for specific time.

With a URL the DownloadMediaBuilder Widget search locally for the file, if found file will be in a snapshot, if not found file will be downloaded and will be in a snapshot.

General Usage

What is new ??

- daysToExpire behavior changed.

- autoDownload option to enable/disable auto download.

- Rename onInit callback to onInitialize.

- Add initial state to DownloadMediaStatus.

- Encrypt and decrypt downloaded files with AES.

- Cancel download.

- Retry download if failed.

- Add Encrypting/Decrypting status.

- Refactor DownloadMediaBuilder Widget.

- Optimize plugin imports.

Install

in pubspec.yaml file under dependencies add

media_cache_manager:

For Android :

Go to android -> app -> build.gradle and add this line inside defaultConfig scope

multiDexEnabled true

and modify minSdkVersion to 20

Initializing plugin ( Required )

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await MediaCacheManager.instance.init();
  runApp(const MyApp());
}

Encrypted Files ( Optional )

Encrypting files using AES Encryption with OFB mode.

Call this method once in your main function or elsewhere.

await MediaCacheManager.instance.setEncryptionPassword("I love flutter");

Note :

  • Use this wisely it can affect on performance if you are processing multi and large files.
  • User and Other apps can not access unencrypted files due to files stored in Temporary Directory.

OR when Initializing plugin you can call a param encryptionPassword instead.

await MediaCacheManager.instance.init(encryptionPassword: 'I love flutter');

Note :

  • By default encryption is disabled until you call setEncryptionPassword.
  • Large files takes more time to en/decrypt.

Encrypt Single File

You can encrypt single file using encryptionPassword in DownloadMediaBuilder widget

DownloadMediaBuilder(
  url: "https://static.remove.bg/remove-bg-web/5c20d2ecc9ddb1b6c85540a333ec65e2c616dbbd/assets/start-1abfb4fe2980eabfbbaaa4365a0692539f7cd2725f324f904565a9a744f8e214.jpg",
  encryptionPassword: "this is a password",  
  onSuccess: (snapshot) {
    return Image.file(File(snapshot.filePath!);
  }
)

Note:

  • You have to save your files passwords somewhere safe plugin is not caching your files passwords.

  • If plugin could not decrypt file with given password file will start downloading again.

setExpireDate ( Optional )

before using the DownloadMediaBuilder Widget you have to call this method for once. ex: I am calling it in main method or at my splash screen. if you didn't call this method it will cache Permanently.

Note: File expiration will be expansion if user has loaded the file before expiration EX: if we set daysToExpire to 3, then user has loaded the file in the second day before expiration, result file will be loaded and expiration will be expansion for new 3 days and so on.

await MediaCacheManager.instance.setExpireDate(daysToExpire: 10);

OR when Initializing plugin you can call a param daysToExpire instead.

await MediaCacheManager.instance.init(daysToExpire: 1);

General Usage

DownloadMediaBuilder(
  url: 'https://static.remove.bg/remove-bg-web/5c20d2ecc9ddb1b6c85540a333ec65e2c616dbbd/assets/start-1abfb4fe2980eabfbbaaa4365a0692539f7cd2725f324f904565a9a744f8e214.jpg',
  onSuccess: (snapshot) {
    return Image.file(File(snapshot.filePath!));
  },
  onLoading: (snapshot) {
    return LinearProgressIndicator(
      value: snapshot.progress,
    );
  },
),

Disable autoDownload ( Optional )

auto download is enabled by default.

late DownloadMediaBuilderController controller;

DownloadMediaBuilder(
  url: 'https://sample-videos.com/video123/mp4/720/big_buck_bunny_720p_5mb.mp4',
  autoDownload: false,
  onInitialize: (controller) => this.controller = controller,
  onInitial: (snapshot) {
    return ElevatedButton(
      onPressed: controller.getFile,
      child: const Text('Load file'),
    );
  },
  onSuccess: (snapshot) {
    return BetterPlayer.file(snapshot.filePath!);
  },
  onLoading: (snapshot) {
    return LinearProgressIndicator(
      value: snapshot.progress,
    );
  },
),

Handle Loading and error states

DownloadMediaBuilder(
  url: 'https://sample-videos.com/video123/mp4/720/big_buck_bunny_720p_30mb.mp4',
  onLoading: (snapshot) {
    return LinearProgressIndicator(value: snapshot.progress); 
  },
  onSuccess: (snapshot) {
    return BetterPlayer.file(snapshot.filePath!);
  }, 
  onError: (snapshot) {
    return const Text('Error!');
  },
),

Handle Canceled and retry states

late DownloadMediaBuilderController controller;

DownloadMediaBuilder(
  url: 'https://sample-videos.com/video123/mp4/720/big_buck_bunny_720p_30mb.mp4',
  onInitialize: (controller) => this.controller = controller,
  onLoading: (snapshot) {
    /// Cancel download if the status is still loading
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        LinearProgressIndicator(
          value: snapshot.progress,
        ),
        const SizedBox(height: 20),
        ElevatedButton(
          onPressed: controller.cancel,
          child: const Text('Cancel Download'),
        ),
      ],
    );
  },
  onSuccess: (snapshot) {
    return BetterPlayer.file(snapshot.filePath!);
  }, 
  onError: (snapshot) {
    return const Text('Error!');
  },
  onCancel: (snapshot) {
    /// Retry to download the file if the status is canceled
    return ElevatedButton(
      onPressed: controller.retry,
      child: const Text('Retry'),
    );
  },
 ),

Note: if the status is not loading you can not call cancel function retry function is only available if the status is loading

Explaining of snapshot

DownloadMediaSnapshot has three fields :

  • Status, it has 7 status (Initial, Success, Loading, Error, Canceled, Encrypting, Decrypting).
  • FilePath, it will be available if the file had been downloaded.
  • Progress, it's the process progress if the file is downloading.

Libraries

media_cache_manager