pavel null

<resources>
     <integer-array name="lectures">
          <item>R.id.lecture1</item>
          <item>R.id.lecture2</item>
          <item>R.id.lecture3</item>
     </integer-array>
</resources>

int[] lectures = getResources().getIntArray(R.array.lectures);
for (int i = 0;  i < lectures.length; i++) {
  arLecture.add(findViewById(lectures[i]));
}

JSONArray array = root.getJSONArray("some id");
for (int i = 0; i < array.length(); i++) {
    JSONObject item = array.getJSONObject(i);
    db.Insert_Cleaner_Usage()
}

JSONObject list = root.getJSONObject("some id");
Iterator<String> iterator = list.keys();
while(iterator.hasNext()) {
    String key = iterator.next();
    JSONObject item = list.getJSONObject(key);
    db.Insert_Cleaner_Usage()
}