Hello, I am a newbie to android development
I am trying to understand how to parse JSON in android activity
I am not using anything such as PHP etc
I am using NODEJS on server in AWS to generate JSON
I have a JSON ::
{"1":"Hello","2":"World"}
This JSON is coming from an AWS server i have hosted my application
How to parse the JSON data for above JSON ?
How to populate to an android activity ?
PS:: Any links that would help me understand this concept would also be helpful
Thanks,
In the most basic form, you can parse JSON by simply creating a JSON object and passing the string representation of the JSON object to the constructor, like so...
JSONObject myJson = new JSONObject("{\"1\":\"Hello\",\"2\":\"World\"}");
Read the docs on this class for more info on how to extract data from objects and etc... https://developer.android.com/reference/org/json/JSONObject.html
A more abstract way of parsing can be done via the GSON library. In a nutshell, GSON has the ability to take your JSON response and parse it into a Java object for you so that you don't have to do it yourself.
Admittedly using GSON can save a good amount of time from writing code to parse yourself, however, I would probably rather go the JSONObject route if you're new to this.
Related
I want to parse website using retrofit, but I don't know how to create POJO.
And I don't have a json.
http://vuzopedia.ru/vuz/
This is the website where I want to parse information.
if your website does not have an API or anyway to get JSON data then you should consider Web Scraping. You cant make POJO/Models without JSON Data
I want to develop an android application which parses json data into some meaningful data sets and accordingly display them into the UI .
I need suggestions on how to go about it.
PS : i have 0 idea of the available options to chose , so different ways to do the same would help me a lot , since i am new to it
Thanks in advance
You can use gson for parsing the data together with some network library like volley or can use retrofit which provide direct parsing with the help of gson and other lib.
To accomplish this you first need to create some relevant Java pojo
For corresponding json dataset , so that you can use it .
You can generate pojo from this website very easily for any json data
http://www.jsonschema2pojo.org/
In my Android project i use Retrofit 2 with GSON. My problem is inside of JSON I recieve there is an object for example "city":{"id":"1","name":"Washington"} and when user doesn't fill city field server sends me "city":"" (now city is String). So I can't parse this.
You have two options:
Get your backend fixed
Write a custom parser for it
You can register custom parsers with Gson.
Follow the example on the offical site to create one: https://sites.google.com/site/gson/gson-user-guide#TOC-Custom-Serialization-and-Deserialization
I am writing a android application to read a php script in my LAMP server which display the data inside mysql database. The php script simply fetches all rows inside my database table.
I would like to ask if there is any method to parse the information of the php script and set the textview inside the application with the information fetched.
Should my php script echo the data in text, array or JSON format?
What methods or direction should I follow to fetch and parse the data into my android application?
Thanks
I think that JSON is the best format to use, as there are good JSON libraries around .
If you use a JSON library such as Gson or Jackson you can have the library map the JSON recieved from your php script to a Java domain class. So the library will parse the JSON and create an instance of your Java class for you.
Then it is easy to fill your textview with the values from your java object.
The above answer gives the details about what you may do in your app to parse the JSON data . I would like to add more details regarding how you can create the JSON object inside your php files . You may use the json_encode php function to convert the data that you get from your database into a JSON format .
PHP json_encode official documentation with exampes
i am trying to send JSON object to my php webservice.
I have referred this url :- http://www.josecgomez.com/2010/04/30/android-accessing-restfull-web-services-using-json/
In my web service, I have to pass username and password but i don't know,
what is the GSON. can you tell why GSON use in this.????
I am new in json. if you know about json please guide me to solve this problem.
GSON is a Java library to convert java objects to JSON and vice-versa. You don't need it unless you have some complex JSON structure. For simple objects you can easily construct the JSON string yourself.