Main Activity code for the Fastjson tutorial on the SSaurel's Blog

MainActivity.java

package com.ssaurel.fastjson;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

import com.alibaba.fastjson.JSON;

public class MainActivity extends AppCompatActivity {

    private TextView resultTv;

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

        // display encode result
        Groups groups = createData();
        String json = encode(groups);
        resultTv.setText(json);

        // decode with fast JSON (next step)
        groups = decode(json);

        for (Group group : groups.getGroups()) {
            // iterate on groups ...
        }
    }

    public Groups createData() {
        Groups groups = new Groups();
        Group group1 = new Group();
        groups.addGroup(group1);
        Group group2 = new Group();
        groups.addGroup(group2);

        group1.setId(0L);
        group1.setName("Admin");

        group2.setId(1L);
        group2.setName("Moderators");

        User user = new User();
        user.setId(0L);
        user.setName("Sylvain Saurel");
        group1.addUser(user);

        user = new User();
        user.setId(1L);
        user.setName("Claude Saurel");
        group1.addUser(user);

        user = new User();
        user.setId(2L);
        user.setName("Rachida Saurel");
        group2.addUser(user);

        return groups;
    }

    public String encode(Groups groups) {
        // Encode POJO hierarchy to JSON quickly with Fastjson
        return JSON.toJSONString(groups); // That's All !
    }

    public Groups decode(String json) {
        // Decode JSON in String format and bind it in Groups Java POJO Hierarchy
        return JSON.parseObject(json, Groups.class);
    }
}