Android java ArrayList Object

Question

Trying to educate myself from a sample Android app in Android Studio, I have found an ArrayList<String>.
In the debugging mode, the value(s) of this array is as below (using the view tool of the IDE)
I don't really understand how to recognize each element of the array.
I would appreciate any help.

The list is constructed as below (from a JSON file).

public static List<ArrayList<String>> getPrintDataFromJson(Context context, String jsonFileName, int copies, float multiple) {
    try {
        String jsonContent = AssetJsonReader.readJsonFromAssets(context, jsonFileName,
                    error -> Log.e(TAG, "Json not found: " + jsonFileName + ", error: " + error));

        if (jsonContent == null || jsonContent.isEmpty()) {
            Log.e(TAG, "JSON is empty: " + jsonFileName);
            return null;
        }
        return parseJsonToPrintData(jsonContent, copies, multiple);
    } catch (Exception e) {
        Log.e(TAG, "Cannot get data from Json: " + jsonFileName, e);
        return null;
    }
}

and...

private static List<ArrayList<String>> parseJsonToPrintData(String jsonContent, int copies, float multiple) {
        try {
            List<PrintTemplate> templates = null;

            try {
                PrintTemplate[] templateArray = JsonProcessor.GSON_INSTANCE.fromJson(jsonContent, PrintTemplate[].class);
                if (templateArray != null && templateArray.length > 0) {
                    templates = new ArrayList<>();
                    Collections.addAll(templates, templateArray);
                }
            } catch (Exception e) {
                try {
                    PrintTemplate template = JsonProcessor.GSON_INSTANCE.fromJson(jsonContent, PrintTemplate.class);
                    if (template != null) {
                        templates = new ArrayList<>();
                        templates.add(template);
                    }
                } catch (Exception ex) {
                    Log.e(TAG, "Unable to parse JSON as a PrintTemplate object or array", ex);
                    return null;
                }
            }

            if (templates == null || templates.isEmpty()) {
                Log.e(TAG, "There is no valid template data in the JSON.");
                return null;
            }

            List<String> processedJsonData = JsonProcessor.processTemplateList(templates);
            int templateLength = templates.size();
            List<PrinterImageProcessingInfoWrapper> infoWrappers = new ArrayList<>();

            for (int i = 0; i < templateLength; i++) {
                infoWrappers.add(createPrinterImageProcessingInfoWrapper(templates.get(i), copies, multiple));
            }
            List<String> processedInfoData = JsonProcessor.processInfoWrapperList(infoWrappers);

            List<ArrayList<String>> printData = new ArrayList<>();
            printData.add(new ArrayList<>(processedJsonData));
            printData.add(new ArrayList<>(processedInfoData));

            return printData;

        } catch (JsonSyntaxException e) {
            Log.e(TAG, "JSON syntax error", e);
            return null;
        } catch (Exception e) {
            Log.e(TAG, "Parsing JSON content failed to print data", e);
            return null;
        }
    }

and the result in the list is as below.

{
  "width" : 40.0,
  "height" : 20.0,
  "rotate" : 0,
  "background" : "",
  "backgroundImage" : "",
  "elements" : [ {
    "type" : "barcode",
    "x" : 2.0,
    "y" : 2.0,
    "width" : 36.0,
    "height" : 16.0,
    "rotate" : 0,
    "codeType" : 20,
    "value" : "6942141752896",
    "fontSize" : 3.200000047683716,
    "textHeight" : 3.200000047683716,
    "textPosition" : 0,
    "zIndex" : 0,
    "isTitle" : 0
    },{
    "type" : "text",
    "x" : 2.0,
    "y" : 2.0,
    "width" : 36.0,
    "height" : 7.400000095367432,
    "rotate" : 0,
    "value" : "Certificate",
    "fontCode" : "",
    "fontFamily" : "",
    "fontSize" : 5.599999904632568,
    "textAlignHorizonral" : 1,
    "textAlignVertical" : 1,
    "lineMode" : 9,
    "letterSpacing" : 0.0,
    "lineSpacing" : 1.0,
    "typesettingMode" : 1,
    "colorReverse" : 0,
    "zIndex" : 101,
    "wordSpacing" : 0,
    "lineBreakMode" : 1,
    "isTitle" : 0,
    "fontStyle" : [ "bold" ]
  } ]

The only thing you have posted is JSON. Where is your Java ArrayList<String>? — Elliott Frisch
– Elliott Frisch, Commented 20 hours ago
Please see stackoverflow.com/staging-ground/79921054. This question was promoted from staging ground while there were still open question. — Sören
– Sören, Commented 19 hours ago
Elliott, you are right. But here what I see ... private ArrayList<String> jsonList; Then.. List<ArrayList<String>> printData = JsonPrintData.getPrintData(this, printType, copies, multiple); for (int i = 0; i < length; i++){ jsonList.add(printData.get(0).get(i));} — Dimitrios Georgiadis
– Dimitrios Georgiadis, Commented 2 hours ago
and then...public static List<ArrayList<String>> getPrintData(Context context, String type,int copies, float multiple) { String jsonFileName === some json file; return getPrintDataFromJson(context, jsonFileName, copies, multiple); } So, the inital declaration is ArrayList<String> !! not json. — Dimitrios Georgiadis
– Dimitrios Georgiadis, Commented 2 hours ago

Dimitrios Georgiadis · Accepted Answer · 2026-04-13 10:44:49Z

0

Ok, I found how to address the element.

((BarCodeElement) template.getElements().get(0)).getJson().setValue(MainActivity.tbar.getText().toString());
((TextElement) template.getElements().get(1)).getJson().setValue(MainActivity.tcod.getText().toString());
((TextElement) template.getElements().get(2)).getJson().setValue(MainActivity.tnam.getText().toString());
((TextElement) template.getElements().get(3)).getJson().setValue(MainActivity.tprc.getText().toString());

answered 2 hours ago

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