I'm new to both using json and developing for android, however I'm looking to learn how to retrieve information using a json api key.
Let's say this website has all the information I need. How can I access and store that information?
https://website.com/api/user/key/a015b92aec875bd24e8fdc73477bfdcr
For example it would have something like this,
{"balance":"123","due":"3426"}
To access it, you need to open HTTPS connection to the server that has that API key, which is that https address you just provided. The server will return the JSON objects for you, to parse the string data, you can use GSON. GSON will translate all the JSON objects into Java objects, and it will help you populate your pre-built Java data structures with those data
You can get the web content using the Android HTTPClient (or follow something like the guide on this page).
For storage, you need to parse the JSON - see this SO question.
For storage, either store the raw JSON in a file or create an SQLite database and store it according to your specifications.
Related
As we all know parse server being shutdown, but if i want to use parse local data store concept without any parse server interaction(without calling parse initialize(context,appkey,masterkey)) , then how could we achieve this?
Please suggest me if we can use it or not? If not , any best option apart from parse server for local data store?
Thanks in adavance!
You can't use Parse local datastore without parse backend. Objects do not get an objectid until the device is in contact with the Parse backend. Parse pinning is meant as a convenience addition to the backend; not as a replacement.
If you're now considering using ONLY parse local datastore, you should replace your solution with Core Data instead. Or consider setting up your own Parse server at i.e. Heroku.
I need to get some simple data (actual currency values) to my android application. I'm not sure what is the best way to achieve it. Do I have to make some database and put it on server and than update it manually or there is some better way?
You can use an API Service and access to this service from you android device. You donot need to do a server implementation for this.
e.g. for exchange rates check https://openexchangerates.org/
Yes.
Please make a server and a PHP which going to print out the values in JSON. You can validate your json with http://jsonlint.com/. After it you can download and parse the json with yourself or a 3rd part library (like retrofit).
You can use this website to generate POJO, so retrofit can parse the json for you by it`s own.
http://www.jsonschema2pojo.org/
select: JSON instead of scheme and select GSON instead of JSON, if you are using retrofit.
sources:
https://en.wikipedia.org/wiki/Gson
https://github.com/square/retrofit
http://blog.robinchutaux.com/blog/a-smart-way-to-use-retrofit/
I need to retrieve huge amounts of data from a database through a web service from an Android app. I have two different ways to do this, and I wanted some advice on it:
1. The first option is to create a .php file on the server side that managed any POST coming from the client (Android app). The server would then create a JSON response. Finally we would parse this response using a JSON parser in Android. This is also known as the REST scheme.
2. The second option is to create a SERVLET, execute it from the client (Android), have the servlet send the request to the database for us, and finally parse that data from Android. Obviously the servlet would be written so that it could easily interact with the database.
Points to note (so as to decide which option is better):
1. I won't be storing anything in the database from the client. That is, my Android app is read-only.
2. I will be reading from a huge database, so it is a priority here the performance of the Client-Server interaction, with a special mention for data parsing and for servlet vs php performance.
Any help would be greatly appreciated.
Android has built-in support for parsing JSON data with the use of JSONObjects and JSONArrays, so it would be a lot easier to handle data in that form, rather than handling servlets. Its even possible to directly receive the web service response as a JSONObject or JSONArray.
In general, web services in Android should be of the RESTful type. That's how Google seems to prefer it. That's why there's built-in support for JSON, but not for SOA or Servlets.
References:
1. Reasons for not directly write Servlets for creating a REST API.
2. Servlet vs REST.
i need to get a website (any website ) in json format to use it with android and json parser to get data and if possible that the website include images to be able to download data and images using json parser.
i have been searching about 2 days without any success, its my first time that i use json so i do know where to search and how to search.
what i need is a website to make a test on it that will be available in json format
anyone can help me ???
i will appreciate that.
Use http://www.jsontest.com/ to get JSON from that website.
Read there and for example if you call http://ip.jsontest.com/ you will get a JSON response as {"ip": "203.92.62.242"} then you can parse them in your android application.
For future readers :
Facebook programmers provide the json format for each request.
All you have to do is :
If the facebook page url is : http://www.facebook.com/youtube
To get json format of page, request this : http://graph.facebook.com/youtube
I suggest to read that :
Usually standard web service today provide data in at least two format: json and xml for each endpoint (url), you just add .xml or .json extension to the requested url.
But most of the time you don't have to do that, common web services today always provide json data because it's defined in RESTFul rules. If they dont, you can't get the json. The case is same for you, just ask the developer for API docs.
I have a .net webApi project that contains some methods.
The methods send and get complex objects.
My android application gets the objects in json format and parsing them manually.
In any changes of the objects in the WebApi project I have to change manually the android application project.
I would like to know what is the best practice to work with android application client and .Net WebApi.
There is any tool to connect between them or to auto map the objects?
Please help me
Tal
U do use json parsing technique for parsing the json responses.its proper way of data parsing there is i think no tool for auto mapping.
From the Android Client end you have to use Spring RestTemplate together with Data Transfer Objects (DTOs). You wouldn't need to manually manipulate a JSON String values. It's all about dealing with Java Objects then. You can directly pass the Objects to the RestTemplate as Entity classes and get the JSON String Auto Mapped to your DTOs.