扫描条形码并将其存储在回收器视图中后从JSON中读取

Question

//1.我正在尝试使用 ZXingScannerView 扫描仪传递条形码值

//阿拉伯数字。然后，如果扫描的条形码等于 JSON 条形码对象显示回收器视图中 JSON//文件中的item_name和成本，我的问题是扫描后什么都没有显示

@Override public View onCreateView(LayoutInflower inflater， ViewGroup container， Bundle savedInstanceState( { View view = inflater.inflate(R.layout.fragment_second， container， false(;

recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
scannerView = (ZXingScannerView) view.findViewById(R.id.zxscan);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity().getApplicationContext());
recyclerView.setLayoutManager(linearLayoutManager);

CustomAdapter customAdapter = new CustomAdapter(getActivity(), products_name, cost);
recyclerView.setAdapter(customAdapter); // set the Adapter to RecyclerView

Dexter.withActivity(getActivity())
.withPermission(Manifest.permission.CAMERA)
.withListener(new PermissionListener() {
@Override
public void onPermissionGranted(PermissionGrantedResponse response) {
scannerView.setResultHandler(SecondFragment.this);
scannerView.startCamera();
}
@Override
public void onPermissionDenied(PermissionDeniedResponse response) {
Toast.makeText(getActivity(), "Please Accept The Permission", Toast.LENGTH_LONG).show();
}
@Override
public void onPermissionRationaleShouldBeShown(PermissionRequest permission, PermissionToken token) {
}
})
.check();
return view;
}
@Override
public void onDestroy() {
scannerView.stopCamera();
super.onDestroy();
}

@Override
public void handleResult(Result rawResult) {
processRawResult(rawResult.getText());
if (Patterns.WEB_URL.matcher(rawResult.getText()).matches()) {
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(rawResult.getText()));
startActivity(browserIntent);
}
}
private void processRawResult(String text) {
if (text.startsWith("BEGIN:")){
String[] tokens = text.split("n");
QRVCardModel qrvCardModel = new QRVCardModel();
for (int i = 0; i < tokens.length; i++)
{
if (tokens[i].startsWith("BEGIN:")) {
qrvCardModel.setType(tokens[i].substring("BEGIN:".length()));
}
else if (tokens[i].startsWith("N")) {
qrvCardModel.setName(tokens[i].substring("N:".length()));
}
else if (tokens[i].startsWith("ORG")) {
qrvCardModel.setOrg(tokens[i].substring("ORG:".length()));
}
else if (tokens[i].startsWith("TEL:")) {
qrvCardModel.setTel(tokens[i].substring("TEL:".length()));
}
else if (tokens[i].startsWith("URL:")) {
qrvCardModel.setUrl(tokens[i].substring("URL:".length()));
}
else if (tokens[i].startsWith("EMAIL:")) {
qrvCardModel.setEmail(tokens[i].substring("EMAIL:".length()));
}
else if (tokens[i].startsWith("ADS:")) {
qrvCardModel.setEmail(tokens[i].substring("ADS:".length()));
}
else if (tokens[i].startsWith("NOTE:")) {
qrvCardModel.setNote(tokens[i].substring("NOTE:".length()));
}
else if (tokens[i].startsWith("SUMMERY:")) {
qrvCardModel.setSummer(tokens[i].substring("SUMMERY:".length()));
}
else if (tokens[i].startsWith("DTSTART:")) {
qrvCardModel.setDtstart(tokens[i].substring("DTSTART:".length()));
}
else if (tokens[i].startsWith("DTEND:")) {
qrvCardModel.setDtend(tokens[i].substring("DTEND:".length()));
}
}
}
else if (text.startsWith("hhtp://")||
text.startsWith("hhtps://")||
text.startsWith("www."))
{
QRURLMode qrurlMode = new QRURLMode(text);
}
else if (text.startsWith("geo:"))
{
QRGeoModel qrGeoModel= new QRGeoModel();
String delims = "[ ,?q= ] +";
String tokens[]= text.split(delims);
for (int i=0; i< tokens.length;i++)
{
if (tokens[i].startsWith("geo:"))
{
qrGeoModel.setLat(tokens[i].substring("geo:".length()));
}
}
qrGeoModel.setLat(tokens[0].substring("geo".length()));
qrGeoModel.setLng(tokens[1]);
qrGeoModel.setGeo_place(tokens[2]);
}
else
{
Toast.makeText(getActivity(),"QR CODE PASS", Toast.LENGTH_SHORT).show();

String json;

try {
InputStream is = getActivity().getAssets().open("products.json");
Toast.makeText(getActivity(), "JSON1", Toast.LENGTH_SHORT).show();
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
//Toast.makeText(getActivity(),"JSON2", Toast.LENGTH_SHORT).show();
json = new String(buffer, "UTF-8");
Log.d("JSONTestLogs", "JSON Raw Text: " + json);
JSONObject object = new JSONObject(json);
JSONArray productsArray = object.getJSONArray("products");
Log.d("JSONTestLogs", "Fetching the Products array from JSON File. Size: " + productsArray.length());
for (int i = 0; i < productsArray.length(); i++) {
JSONObject item = productsArray.getJSONObject(i);
Log.d("JSONTestLogs", "Item: " + i + "n" + item.toString());
if (text.equals(item.getString("bar_code"))) {
products_name.add(item.getString("item_name"));
cost.add(item.getString("cost"));
}
}
}
catch
(IOException e)
{
e.printStackTrace();
}
catch (JSONException e){
e.printStackTrace(); }
}

scannerView.resumeCameraPreview(SecondFragment.this);
// Toast.makeText(getActivity(),"JSON3", Toast.LENGTH_SHORT).show();
}
}

Answer 1

扫描条形码后。我认为将条形码添加到您的列表中;

products_name.add(item.getString("item_name"));

添加操作后，您没有刷新回收站视图数据。

此代码部分仅工作一次。

CustomAdapter customAdapter = new CustomAdapter(getActivity(), products_name, cost);
recyclerView.setAdapter(customAdapter); // set the Adapter to RecyclerView

您应该再次调用此部分，或者您需要在适配器中创建一个函数来通知RecyclerView的数据。