I am making a new application with Flutter. Products are listed on the web with api. But I wonder,
The user opened the application and all products from json appeared in the application. Then I want him to see the same products when he closes the internet. How can I do this, what do I have to investigate?
for offline viewing:
Using sqflite for storing image and text (json)
or
Using cached_network_image for image caching & sqflite for storing text (json)
Related
Hi everyone I need help with downloading images in background in our flutter app
We are showing users list of images in our app we need to allow users to select these images and save them to thier phone but the download has to happen in the background so that the user can continue using rest of the features of the app
Our app is developed in flutter
Our backend is written in laravel 8
And database is SQL
I am a newbie and so I don't have much clarity regarding what more information shud I put in to help you all understand the code so I am adding a screenshot of the UI of our app search page
where we need to allow users to select multiple images and save them to their phone local storage but the download has to happen in background as the image size is big
You can use a async function where you call it and the app goes on. In the background all images are going to be saved on the phone while you still can use the app
I tiring to made app that get data(Images and titles) from a web site as json api and put this data in a ListView bulider,
but I want to save the data on device first to view it when the device isn't connected to the internet and I want the data who I save it , be different order
You can use the Shared Preferences Package to store a Map
on the device.
I recommend reading Data Persistence with Flutter in the Cookbook. This will show you how to tackle this.
You could use SQFLite if you are familiar with SQL or Hive if you prefer to stick with pure dart
I am developing an Android and iOS app that could be used in areas that have a very poor or no data connection. It is a requirement for the app to be pre-loaded with all of the data so it will work even if the app never communicated with the server, but it also needs to be able to update and sync when a connection is made. Is it possible to manually populate the AppSync (Apollo) cache database with data on launch and query and mutate it later? The app also contains several search and filter queries. Our backend API is currently using GraphQL.
I have seen this question, Is it possible to build offline-first mobile apps using AWS AppSync?, but it is a little different that what I'm asking.
The recommendation would be to hydrate (read: pre-load with data) a local SQLite database after install. SQLite is what the 'local cache' uses to persist data on the device.
Refer to this github issue for a code example of how to do this:
https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/160
I want to develop offline book reading app using flutter. There is any way in flutter so that user can access book offline.
you can put data in form of json and load data when you requires it
you can read more about it here
https://flutter.io/assets-and-images/
You can download the images/pdf files of your book in the device storage (External Storage) by asking user like
"Hey! Do you want this to be available offline? Cool, click the button and grant the storage permission in order to proceed".
After this, you can download the files from the server in device external storage and use it. Simple!
I know that Firestone will store data if the user is offline and I saw that there is a way to do this with native code, but is it possible to enable these offline capabilities in flutter itself?
Firebase firestore support full offline. I’m using it myself. So long as you’ve read the data at least once before going offline. If using firebase authentication - the custom option also works offline. Google sign-in does not.
The downside to firebases offline capabilities is that it’s only firestore (not counting the older firebase db) and not the other products like cloud storage.
So for example I’ve written an app and the document side of it is fully offline enabled however you can take photos in the app and I had the write the offline capabilities to sync this photos with firebase cloud storage myself.
(I basically just keep them in a pending folder and try to sync them when the device has connectivity.)