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JSON Parsing File Example 2 In Android Studio: Below is the 2nd example of JSON parsing In Android Studio. In this example we create a JSON file and store it in assets folder of Android. In this JSON file we have list of users where each object contain the information like user id, name, email, gender and different contact numbers. The Firebase Assistant registers your app with a Firebase project and adds the necessary Firebase files and code to your Android project — all from within Android Studio. Caution: When using the Firebase Assistant, carefully follow the steps described in this section of the guide to check that all your dependencies and settings are configured.
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JSON stands for JavaScript Object Notation.It is an independent data exchange format and is the best alternative for XML. This chapter explains how to parse the JSON file and extract necessary information from it.
Android provides four different classes to manipulate JSON data. These classes are JSONArray,JSONObject,JSONStringer and JSONTokenizer.
The first step is to identify the fields in the JSON data in which you are interested in. For example. In the JSON given below we interested in getting temperature only.
JSON - Elements
An JSON file consist of many components. Here is the table defining the components of an JSON file and their description −
Sr.No | Component & description |
---|---|
1 | Array([) In a JSON file , square bracket ([) represents a JSON array |
2 | Objects({) In a JSON file, curly bracket ({) represents a JSON object |
3 | Key A JSON object contains a key that is just a string. Pairs of key/value make up a JSON object https://evervictory364.weebly.com/blog/best-speed-downloader-for-android. |
4 | Value Each key has a value that could be string , integer or double e.t.c |
JSON - Parsing
For parsing a JSON object, we will create an object of class JSONObject and specify a string containing JSON data to it. Its syntax is −
The last step is to parse the JSON. A JSON file consist of different object with different key/value pair e.t.c. So JSONObject has a separate function for parsing each of the component of JSON file. Its syntax is given below −
The method getJSONObject returns the JSON object. The method getString returns the string value of the specified key.
Apart from the these methods , there are other methods provided by this class for better parsing JSON files. These methods are listed below −
Sr.No | Method & description |
---|---|
1 | get(String name) This method just Returns the value but in the form of Object type |
2 | https://evervictory364.weebly.com/blog/android-phones-for-dummies-pdf-free-download. getBoolean(String name) https://evervictory364.weebly.com/blog/dr-drum-free-download-for-android. This method returns the boolean value specified by the key |
3 | getDouble(String name) This method returns the double value specified by the key |
4 | getInt(String name) This method returns the integer value specified by the key |
5 | getLong(String name) https://evervictory364.weebly.com/blog/google-earth-download-free-2011-for-android. This method returns the long value specified by the key |
6 | length() This method returns the number of name/value mappings in this object. |
7 | names() This method returns an array containing the string names in this object. |
Example
To experiment with this example , you can run this on an actual device or in an emulator.
Steps | Description |
---|---|
1 | You will use Android studio to create an Android application. |
2 | Modify src/MainActivity.java file to add necessary code. |
3 | Modify the res/layout/activity_main to add respective XML components |
4 | Modify the res/values/string.xml to add necessary string components |
5 | Run the application and choose a running android device and install the application on it and verify the results |
Following is the content of the modified main activity file src/MainActivity.java.
Following is the modified content of the xml HttpHandler.java.
Following is the modified content of the xml res/layout/activity_main.xml.
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Following is the modified content of the xml res/layout/list_item.xml.
Android Studio Json Parser
Following is the content of AndroidManifest.xml file.
Let's try to run our application we just modified. I assume you had created your AVD while doing environment setup. To run the app from Android studio, open one of your project's activity files and click Run icon from the toolbar. Android studio installs the app on your AVD and starts it and if everything is fine with your setup and application, it will display following Emulator window −
Android Studio Json Tutorial
Above Example showing the data from string json,The data has contained employer details as well as salary information.