I followed a tutorial on how to link a csv file I have to android studio so I can view one row of the elements from the csv in a dropdown. (The left row is for 'number' and the right row is for 'items'.
but now I'm trying to figure out so that:
When the user selects an item from the dropdown, the corressponding 'number' (from the csv) shows up, on a TextView.
Is this possible? Any ideas on how to get this working?
Thanks!
MyListAdapter.java
public class MyListAdapter extends ArrayAdapter<String> { int groupid; List<String> items; Context context; String path; public MyListAdapter(Context context, int vg, int id, List<String> items) { super(context, vg, id, (List<String>) items); this.context = context; groupid = vg; this.items = items; } static class ViewHolder { public TextView textid; public TextView textname; } @Override public View getDropDownView(int position, View convertView, ViewGroup parent) { { View rowView = convertView; if (rowView == null) { LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); rowView = inflater.inflate(groupid, parent, false); ViewHolder viewHolder = new ViewHolder(); viewHolder.textid = (TextView) rowView.findViewById(R.id.txtid); viewHolder.textname = (TextView) rowView.findViewById(R.id.txtname); rowView.setTag(viewHolder); } // Fill data in the drop down. ViewHolder holder = (ViewHolder) rowView.getTag(); String row = items.get(position); //holder.textid.setText(row[0]); //prints aisle number, dont need holder.textname.setText(row); return rowView; } } } create.java
public class create extends AppCompatActivity { private LinearLayout mLinearLayout; private ArrayList<SearchableSpinner> mSpinners; //TODO add the below list of buttons and checkboxes private List<AppCompatButton> mButtons = new ArrayList<>(); private List<CheckBox> mCheckboxes = new ArrayList<>(); private List<View> mViews = new ArrayList<>(); //Button buttontest; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_create); getSupportActionBar().setDisplayHomeAsUpEnabled(true); GlobalClass globalClass = (GlobalClass) this.getApplicationContext(); ArrayList<String> items = new ArrayList<>(); items.add(String.valueOf(mSpinners)); // add you selected item globalClass.setItems(items); mSpinners = new ArrayList<>(); mLinearLayout = findViewById(R.id.my_linearLayout); //mLinearLayout.setBackgroundColor(Color.parseColor("#ffffff")); sets colour for whole mlinearLayout so if you want to pess it to elete it'll deelete deverhything . //mLinearLayout.addView(makeSpinner()); // First spinner //When user clicks the FAB button, hide the existing layout, using View.GONE,and then create spinner and checkbox // programatically(refer to my aligning code) and then programatically set the mLinearLayou background to the bg.xml // layouts background = mLinearLayout //You can choose which all elements to hide, using their id //btn2.setVisibility(View.GONE); //take away the white button , . //code for the add button to add more items FloatingActionButton floatingActionButton = (FloatingActionButton) findViewById(R.id.fab); floatingActionButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Toast.makeText(getBaseContext(), "Item added!", Toast.LENGTH_SHORT).show(); // Handle ze click. final Spinner spinner = makeSpinner(); mLinearLayout.addView(spinner); LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) spinner.getLayoutParams(); layoutParams.setMargins(5, 100, 10, 0); //top 70 Resources resources = getResources(); DisplayMetrics metrics = resources.getDisplayMetrics(); layoutParams.height = (int) (70 * ((float) metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT)); //80 layoutParams.width = (int) (240 * ((float) metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT)); //240 spinner.setLayoutParams(layoutParams); //Add a new button final AppCompatButton newButton = makeButton(); mLinearLayout.addView(newButton); // Add another button //TODO add button to the list mButtons.add(newButton); final int listSize = mButtons.size(); //code for deleting the said item. newButton.setOnClickListener(new View.OnClickListener() { //start @Override public void onClick(View view) { //when the 'new button' is pressed, alert shows if you are sure you want to delete the item or not. final View.OnClickListener context = this; AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(create.this); // set title alertDialogBuilder.setTitle("Delete Item"); // set dialog message alertDialogBuilder .setMessage("Are you sure you want to delete this item?") .setCancelable(false) .setPositiveButton("Yes", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { // if this button is clicked, close // current activity if (listSize > 0) { mButtons.get(listSize - 1).setVisibility(View.GONE); mCheckboxes.get(listSize - 1).setVisibility(View.GONE); mSpinners.get(listSize - 1).setVisibility(View.GONE); mViews.get(listSize - 1).setVisibility(View.GONE); Toast.makeText(getBaseContext(), "Item removed.", Toast.LENGTH_SHORT).show(); } } }) .setNegativeButton("No", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { // if this button is clicked, just close // the dialog box and do nothing dialog.cancel(); } }); // create alert dialog AlertDialog alertDialog = alertDialogBuilder.create(); // show it alertDialog.show(); } }); //TODO adds a new view that is suppose to replicate the button so when it is pressed, blah happens. //TODO i.e move the button code to the onclick View then delete button cause its useless. //Add a new view final View newView = makeView(); mLinearLayout.addView(newView); //TODO create new layout params here mViews.add(newView); //Add a new checkbox final CheckBox newCheckbox = makeCheckbox(); mLinearLayout.addView(newCheckbox); //TODO add checkbox to your list mCheckboxes.add(newCheckbox); } }); } //DUPLICATING ITEMS WHEN FAB IS PRESSED// private CheckBox makeCheckbox() { //Create new Checkbox CheckBox checkbox = new CheckBox(this); // Setup layout LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); checkbox.setLayoutParams(layoutParams); return checkbox; } private View makeView() { //create new View View view = new View(this); view.setBackgroundColor(Color.parseColor("#FFC0CB")); LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, 50); new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, 50); //LinearLayout.LayoutParams.MATCH_PARENT, // LinearLayout.LayoutParams.WRAP_CONTENT); view.setLayoutParams(layoutParams); //setup layout return view; } private AppCompatButton makeButton() { //creates new buttons i need //Create new Button AppCompatButton button = new AppCompatButton(this); // Setup layout LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); button.setBackgroundColor(Color.parseColor("#ffffff")); return button; } private Spinner makeSpinner() { //opens csv InputStream inputStream = getResources().openRawResource(R.raw.shopitems); CSVFile csvFile = new CSVFile(inputStream); List<String> itemList = csvFile.read(); //Create new spinner // SearchableSpinner spinner = (SearchableSpinner) new Spinner(this, Spinner.MODE_DROPDOWN); SearchableSpinner spinner = new SearchableSpinner(this); // Setup layout LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); spinner.setLayoutParams(layoutParams); MyListAdapter adapter = new MyListAdapter(this, R.layout.listrow, R.id.txtid, itemList); spinner.setAdapter(adapter); //Add it to your list of spinners so you can retrieve their data when you click the getSpinner button mSpinners.add(spinner); return spinner; } private class CSVFile { InputStream inputStream; public CSVFile(InputStream inputStream) { this.inputStream = inputStream; } public List<String> read() { List<String> resultList = new ArrayList<String>(); BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream)); try { String line; while ((line = reader.readLine()) != null) { String[] row = line.split(","); resultList.add(row[1]); } } catch (IOException e) { Log.e("Main", e.getMessage()); } finally { try { inputStream.close(); } catch (IOException e) { Log.e("Main", e.getMessage()); } } return resultList; } } } 2 Answers
Answers 1
When the user selects an item from the dropdown, the corressponding 'number' (from the csv) shows up, on a TextView.
Is this possible? Any ideas on how to get this working?
Yes, it is possible. You have to do the following :
- read the CSV file
- create a data structure containing a
map<item, number>
Answers 2
You can create a HashMap<item, number> and store your values like this (Assuming both values are string values)
HashMap<String, String> resultList =new HashMap<String, String>(); BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream)); try { String line; while ((line = reader.readLine()) != null) { String[] row = line.split(","); resultList.put(row[1],row[0]); } } catch (IOException e) { Log.e("Main", e.getMessage()); } finally { try { inputStream.close(); } catch (IOException e) { Log.e("Main", e.getMessage()); } } return resultList; This will return a HashMap
You can access the values using
for (Map.Entry<String,String> entry : resultList.entrySet()) { Toast.makeText("Item : " + entry.getKey() + " Number : " + entry.getValue()).show(); } if you still want a List<String> of items you can create is using the above method. and you can get the corresponding 'number' to the item using the HashMap
String number = resultList.get(item); 
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