Android native JSON parsing instance

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 android:orientation="vertical"
 xmlns:andro
 xmlns:app="/apk/res-auto"
 xmlns:tools="/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="">

 <Button
  android:
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="Read json data in file"/>

 <Button
  android:
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="Parse json data"/>

 <TextView
  android:
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="Hello World!"/>

</LinearLayout>

package ;

import ;

public class ShoppingBean {

 private String msg;
 private InfoBean info;

 public String getMsg() {
  return msg;
 }

 public void setMsg(String msg) {
   = msg;
 }

 public InfoBean getInfo() {
  return info;
 }

 public void setInfo(InfoBean info) {
   = info;
 }

 @Override
 public String toString() {
  return "ShoppingBean{" +
    "msg='" + msg + '\'' +
    ", info=" + info +
    '}';
 }

 public static class InfoBean {

  private int cat_id;
  private List<GoodsBean> good;
  private boolean url;

  public int getCat_id() {
   return cat_id;
  }

  public void setCat_id(int cat_id) {
   this.cat_id = cat_id;
  }

  public List<GoodsBean> getGood() {
   return good;
  }

  public void setGood(List<GoodsBean> good) {
    = good;
  }

  public boolean isUrl() {
   return url;
  }

  public void setUrl(boolean url) {
    = url;
  }

  @Override
  public String toString() {
   return "InfoBean{" +
     "cat_, good=" + good +
     ", url=" + url +
     '}';
  }

  public static class GoodsBean {

   private long add_time;
   private String colorcode;
   private String currency_price;
   private String description;
   private String goods_id;
   private String goods_name;
   private String thumb;

   public long getAdd_time() {
    return add_time;
   }

   public void setAdd_time(long add_time) {
    this.add_time = add_time;
   }

   public String getColorcode() {
    return colorcode;
   }

   public void setColorcode(String colorcode) {
     = colorcode;
   }

   public String getCurrency_price() {
    return currency_price;
   }

   public void setCurrency_price(String currency_price) {
    this.currency_price = currency_price;
   }

   public String getDescription() {
    return description;
   }

   public void setDescription(String description) {
     = description;
   }

   public String getGoods_id() {
    return goods_id;
   }

   public void setGoods_id(String goods_id) {
    this.goods_id = goods_id;
   }

   public String getGoods_name() {
    return goods_name;
   }

   public void setGoods_name(String goods_name) {
    this.goods_name = goods_name;
   }

   public String getThumb() {
    return thumb;
   }

   public void setThumb(String thumb) {
     = thumb;
   }

   @Override
   public String toString() {
    return "GoodsBean{" +
      "add_time=" + add_time +
      ", colorcode='" + colorcode + '\'' +
      ", currency_price='" + currency_price + '\'' +
      ", description='" + description + '\'' +
      ", goods_id='" + goods_id + '\'' +
      ", goods_name='" + goods_name + '\'' +
      ", thumb='" + thumb + '\'' +
      '}';
   }
  }

 }

}

/**
  * 1. Store the json file in external storage and use IO stream to read the data in the file
  * 2. Use JSONObject to parse the read data
  */
public class MainActivity extends AppCompatActivity implements  {

 private String mJson = "";

 protected Button mReadFileBtn;
 protected Button mParseBtn;
 protected TextView mResultTv;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  (savedInstanceState);
  (.activity_main);
  initView();
 }

 @Override
 public void onClick(View view) {
  if (() == .read_file_btn) {
   readFile();
  } else if (() == .parse_btn) {
   ShoppingBean shopping = parseJson();
   ("1507", "" + shopping);
  }
 }

 // parse JSON data // Create JSONObject when encountering {}, and create JSONArray when encountering [] private ShoppingBean parseJson() {
  ShoppingBean shopping = null;
  try {
   JSONObject rootObject = new JSONObject(mJson);
   shopping = new ShoppingBean();

   String msg = ("msg");
   (msg);

   JSONObject infoObject = ("info");
    info = new ();
   (info);

   int catId = ("cat_id");
   info.setCat_id(catId);

   boolean url = ("url");
   (url);

   JSONArray goodsArray = ("goods");
   List<> goodsList = new ArrayList<>();
   (goodsList);

   for (int i = 0; i < (); i++) {
    JSONObject goodsObject = (i);
     goods = new ();

    long addTime = ("add_time");
    goods.setAdd_time(addTime);

    String colorCode = ("colorcode");
    (colorCode);

    String currencyPrice = ("currency_price");
    goods.setCurrency_price(currencyPrice);

    String description = ("description");
    (description);

    String goodsName = ("goods_name");
    goods.setGoods_name(goodsName);

    String thumb = ("thumb");
    (thumb);

    (goods);
   }

  } catch (Exception e) {
   ();
  }

  return shopping;

 }

 // Read JSON data in the file private void readFile() {
  // Root directory  // ()

  // Public path for external storage, such as: folders provided by DCIM, DOWNLOADS and other systems//  (type)
  // External storage private path: Android folder//  (null)

  // downloads folder path  String filePath = Environment
    .getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
    .getAbsolutePath();
  String fileName = "";

  File file = new File(filePath, fileName);

  // File character input stream  // Input the word slow character to flush  BufferedReader br = null;
  try {
   br = new BufferedReader(new FileReader(file));
   String line = new String();
   while ((line = ()) != null) {
    mJson += line;
   }
   if (mJson != null) {
    (mJson);
   }
  } catch (Exception e) {
   ();
  } finally {
   try {
    ();
   } catch (IOException e) {
    ();
   }
  }
 }

 private void initView() {
  mReadFileBtn = (Button) findViewById(.read_file_btn);
  ();
  mParseBtn = (Button) findViewById(.parse_btn);
  ();
  mResultTv = (TextView) findViewById(.result_tv);
 }
}

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