I use Picasso for downloading and caching images in my app.
Its work great then i decide to implement this for other requests from web.
my question is how can i cache data (Like json and xml) received from web in android ?
I mean at first request to web if request is successful response save in user device memory till he/she click update data to get fresh data and cache the new data.
You can write you own CacheManger ,below is what Cache Manager should do :
Hit http request and get json data
Add data to local database first[cache the url and json data both]
Provide Data model to your api
When the next reuest comes to cache manager check for url first if
present in db, provide that data since it is been already cached
if the url as key in db is not present then only hit the http apis.
Related
If not want to use SQLITE DB, what is the ways can use to save data?
example: Now i'm use RETROFIT for REST API to fetch Movies of a server when I turn-on Internet can show movies,
but when turn-off internet and restart app will show activity without movies.
I want to make app when turn-off internet show the movies which is loaded before. How can i do that?
Use Volley Android Volley library has a very elaborate caching mechanism. This is one of the best features of volley. When a request is made through volley first it is checked in the cache. If an appropriate response is present in cache then it is parsed and returned directly to main thread, else a network request is made.
You can try to save your json 'as-is' in file or SharedPreferences and get it when your device doesn't have any network.
Also you can try to work with OkHttp cache or interceptors https://github.com/square/okhttp/wiki/Recipes
I am working on an android application in which i want to use caching mechanism for httpurlrequest. I want to cache the response and want to use again for next request.
So, in android how to cache the response and how to use it next time when we do the same request.
Any working example would be great for me.
How to check whether response is from cache or from server?
How to check whether cache is available for the particular request.
PS: there is no any support of cache from server side. i.e sever doesn't send any 'Cache-Control' header field in response.
Thanks,
I have cached the response from the server based on the headers sent by the server . The value of max age is 180 s .From what I understand if any request is made for the same url after 180 s volley frameworks replaces the cache with the updated version of the data from the server . I want to display the cached data when the network connectivity is not present . How can I implement this using android volley???
in this case, hadle the network error and when it happens, get the data from the cache directly with mQueue.getCache().get(request.getCacheKey()), it will return the data if it's in the cache even if it's expired.
I have been looking around for a class to manage the caching of the data from a URLLoader call but been unsuccessful. Does URLLoader cache by default?
I am building an app that fetches a bunch of information on the user (profile details, friend lists, profile image etc) and I would prefer not to call URLLoader each time. I am caching their profile image on first load and hope I can do the same with the rest of the data without having to create a clone of the DB locally.
Cheers
Yes, the URLLoader caches requests, and there are various solutions to break that cache request (generally by adding a random element to the end of the web request). You can see the documentation here for the URLRequest object that's returned, and it's various cache options.
However, I recommend persisting the data locally upon receiving the request and using the platform's database / data storage pattern that you're on. Then, check for internet prior to making the request: if you can make a connection, make the request to retrieve and update the local data. If there's no internet / connection, just load the data you have saved locally. Using the "cached" version of the request isn't a trustworthy pattern.
hi in my app i have large data to be loaded from the web server and each time i call the web server it takes lot of time to load hence i decided to cache the old data and request server only when there is new data and load all the data on a DB and load it from DB offline so that the app is more responsive.
How to implement this as i have no idea about caching, please do suggest ways to implement this and what is the best DB i can use as the data from the server is in json format. what are the methods i need to follow to implement this caching in android.
After parsing , store the data in SQLite Database. For the first time download the data from the server and store in SQLite and show it to the user whenever user opens the app next time show the old data and do send a request to the server for new data if the new data is available update the database and change the UI.