What is JSON

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language, Standard ECMA-262 3rd Edition - December 1999.

• My GitHub Profile: https://github.com/rockstar96969696

What Will I Learn?

• How to Fetch JSON data to your Android App

Requirements

• Working Android Studio
• Basic Knowledge of Android Studio
• Save the data in JSON Format

Procedure

• Start a new Android Project and name it of your own choice.
  

• Now open the XML file of your MainActivity and add a Button and TextView in your Design. You can also copy this code for Testing

• If your Design Preview is Blank then change the Theme to "Holo Dark"
  

• Then Design your Layout and add a Button and a TextView where we fetch our JSON data by clicking that Button and give them id. Follows
  
  
  
  
  
  

• Now Register these Elements in the Main Activity, initialize them and implements the OnClickListener on the fetching Button as follows. Make sure that the TextView is public static
  
  
  

• Now create a new Java Class as follows
  
  
  

• And name it in my case I named it FetchMyData
  
  

• Now open this Link and paste your JSON data here or write down a new and save it.
  
  
  
• Save the data you will provide an API link. Copy this API Link we will use it later.
  
• Now extends you FetchMyData.java class and write down the code as follows
  

• You can also copy this code and change the Activity name According to yours.
  
  


public class FetchMyData extends AsyncTask<Void,Void,Void> {
String result;
@Override
protected Void doInBackground(Void... voids) {
try {
URL url = new URL("https://api.myjson.com/bins/.....");
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
String line = "";
while (line != null) {
line = bufferedReader.readLine();
result = result + line;
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
MainActivity.mydata.setText(result);
}
}


• Now open the Mainfest and add Internet Permission as follows
  
  
<uses-permission android:name="android.permission.INTERNET"/>

  
  

• Now write down the code in OnClickListener on Button in MainActivity as follows
  
  
fetchdata.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Logic Code here When this Button is Clicked
FetchMyData process = new FetchMyData();
process.execute();

        }
    });
  

• Now run your app any of your installed Emulator with "shift+F10" or "F10" and test your app by clicking the Button in it.

Thanks for Reading

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