Create and parse JSON in Android.

activity_main.xml

<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/main_tv_json"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

MainActivity.java

package com.edinstudio.app.training;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class MainActivity extends Activity {
    public static final String TAG = "training";

    private TextView mTvJson;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTvJson = (TextView) findViewById(R.id.main_tv_json);
        mTvJson.setText(parseJSON(createJSON()));
    }

    public static JSONObject createJSON() {
        JSONObject jsonObject = new JSONObject();
        try {
            jsonObject.put("name", "Albert");

            JSONArray score = new JSONArray();
            score.put(60).put(80).put(100);
            jsonObject.put("score", score);

            JSONObject address = new JSONObject();
            address.put("country", "China").put("province", "Beijing");
            jsonObject.put("address", address);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return jsonObject;
    }

    public static String parseJSON(JSONObject jo) {
        String s = null;
        try {
            JSONObject address = jo.getJSONObject("address");
            s = "name: " + jo.getString("name") +
                    "\n2nd score: " + jo.getJSONArray("score").getInt(1) +
                    "\naddress: " + address.getString("province") +
                    ", " + address.getString("country");
        } catch (JSONException e) {
            e.printStackTrace();
        }

        return s;
    }


}