public class User {
  private String id;
  private String name;
  private String from;
  public String getId() {
    return id;
  }
  public void setId(String id) {
    this.id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getFrom() {
    return from;
  }
  public void setFrom(String from) {
    this.from = from;
  }
  @Override
  public String toString() {
    return "User [id=" + id + ",name=" + name + ",from=" + from +"]";
  }
}

//JSONObject解析类
public class JsonParseToObject {
  public Object AllJsonParseToObject(String json, String packageAddress) {
    Object parseObject = null;
    try {
      parseObject = JSON.parseObject(json, Class.forName(packageAddress));
    } catch (ClassNotFoundException e) {
      e.printStackTrace();
    }
    return parseObject;
  }  
} 

public class MainActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    TextView text = (TextView) findViewById(R.id.hw);
    //将我们的对象属性封装都JSONObject中
    JSONObject jo = new JSONObject();
    jo.put("id", "16");
    jo.put("name", "小了");
    jo.put("from", "河南");
    String str = jo.toString();
    Toast.makeText(this, str, Toast.LENGTH_LONG).show();
    //对JSONObject对象进行解析
    User u = (User) new JsonParseToObject().AllJsonParseToObject(jo.toString(), "com.example.jsontoobject.User");
    //判断JSONObject对象解析是否正确
    if(u != null){
      text.setText(jo.toString()+"\nid:"+u.getId()+";name:"+u.getName()+";from:"+u.getFrom());//进行对象操作
    }else{
      text.setText("User == null");
    }
  }
}