java - 检查并读取 android 中主 json 数组中的内部 json 数组？

Question

我想检查并读取主 JSON 数组中的 JSON 数组。

如何检查主 jsonarray 是否有我想要读取的“子菜单”数组？

我在这里实现了我的代码，但它在子菜单数组中没有给我任何值:

for (int i = 0; i < jarray.length(); i++) {
  listDataHeader.add(jarray.getJSONObject(i).get(ClassVariable.MENU.TITLE).toString());

  // For Getting Main Menu in ArrayList
  String title = jarray.getJSONObject(i).get(ClassVariable.MENU.TITLE).toString();
  String uid = jarray.getJSONObject(i).get(ClassVariable.MENU.UID).toString();
  String pid = jarray.getJSONObject(i).get(ClassVariable.MENU.PID).toString();

  HashMap<String,String> map = new HashMap<String, String>();
  map.put(ClassVariable.MENU.TITLE, title);
  map.put(ClassVariable.MENU.UID, uid);
  map.put(ClassVariable.MENU.PID, pid);
  headerarraylist.add(map);

  if (jarray.getJSONObject(i).has(ClassVariable.SUBMENU.SUBMENU)) {
    JSONArray jarraysubmenu  = jarray.getJSONObject(i).getJSONArray(ClassVariable.SUBMENU.SUBMENU);
    Log.e("JarraySubmenu","----->" + jarraysubmenu);
  }
}

Answer 1

How can I check if main jsonarray has a "submenu" array that I want to read?

给你:

JsonArray jarr = jarray.getJSONObject(i).optJSONArray(ClassVariable.SUBMENU.SUBMENU);

if(jarr.length()>0 && jarr!=null)
{
    SUBMENU Jarray is present
}
else
{
    SUBMENU Jarray is Not present
}