JSON Parsing Example

Create JSONParser.java class for parsing api url

package com.examplejsonparsing.act;


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
  static InputStream is = null;
  static JSONObject jObj = null;
  static String json = "";
  // constructor
  public JSONParser() {
  }
  public JSONObject getJSONFromUrl(String url) {
    // Making HTTP request
    try {
      // defaultHttpClient
      DefaultHttpClient httpClient = new DefaultHttpClient();
      HttpPost httpPost = new HttpPost(url);
      HttpResponse httpResponse = httpClient.execute(httpPost);
      HttpEntity httpEntity = httpResponse.getEntity();
      is = httpEntity.getContent();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    } catch (ClientProtocolException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
    try {
      BufferedReader reader = new BufferedReader(new InputStreamReader(
          is, "iso-8859-1"), 8);
      StringBuilder sb = new StringBuilder();
      String line = null;
      while ((line = reader.readLine()) != null) {
        sb.append(line + "n");
      }
      is.close();
      json = sb.toString();
    } catch (Exception e) {
      Log.e("Buffer Error", "Error converting result " + e.toString());
    }
    // try parse the string to a JSON object
    try {
      jObj = new JSONObject(json);
    } catch (JSONException e) {
      Log.e("JSON Parser", "Error parsing data " + e.toString());
    }
    // return JSON String
    return jObj;
  }

}

then in main.xml file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
    
    <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/uid"
        android:textAppearance="?android:attr/textAppearanceLarge" />
    <TextView
        android:id="@+id/email"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/name"
        android:textAppearance="?android:attr/textAppearanceLarge" />
    <TextView
        android:id="@+id/uid"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/name"
        android:layout_alignParentTop="true"
        android:layout_marginTop="76dp"
        android:textAppearance="?android:attr/textAppearanceLarge" />


</LinearLayout>

and last is MainActivity.java file

package com.examplejsonparsing.act;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import android.app.Activity;

import android.os.Bundle;

import android.widget.TextView;

public class MainActivity extends Activity {

  //URL to get JSON Array

  private static String url = "http://10.0.2.2/JSON/";

  //JSON Node Names

  private static final String TAG_USER = "user";

  private static final String TAG_ID = "id";

  private static final String TAG_NAME = "name";

  private static final String TAG_EMAIL = "email";

  JSONArray user = null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

    // Creating new JSON Parser

    JSONParser jParser = new JSONParser();

    // Getting JSON from URL

    JSONObject json = jParser.getJSONFromUrl(url);

    try {

      // Getting JSON Array

      user = json.getJSONArray(TAG_USER);

      JSONObject c = user.getJSONObject(0);

      // Storing  JSON item in a Variable

      String id = c.getString(TAG_ID);

      String name = c.getString(TAG_NAME);

      String email = c.getString(TAG_EMAIL);

      

      //Importing TextView

      final TextView uid = (TextView)findViewById(R.id.uid);

      final TextView name1 = (TextView)findViewById(R.id.name);

      final TextView email1 = (TextView)findViewById(R.id.email);

      //Set JSON Data in TextView

      uid.setText(id);

      name1.setText(name);

      email1.setText(email);

  } catch (JSONException e) {

    e.printStackTrace();

  }

    }

}

and don't forget to give permission in manifest.xml file

<uses-permission android:name="android.permission.INTERNET" />