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checkbox uncheck and row values of listview are not updated

Confusing at it may seem, I am confused of what is happening too. I have an application in which there is a listview that displays values and when a row is pressed, the third value of the row will display a value.
Example is: third value is 30 and when it's pressed, it should be divided by 6, so the answer should be 5.
But when I scroll in the listview, the checkbox becomes unchecked and the third value of the row goes back to its old value (30).
Is there any way to keep the checkbox from being checked and the value of the row preserved when clicked?
Here's the snippet of my code.
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#RequiresApi(api = Build.VERSION_CODES.N)
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
CheckBox checkBox = (CheckBox)view.findViewById(R.id.checkmark);
TextView tv3 = (TextView)view.findViewById(R.id.tx_counter);
EditText editText = (EditText)findViewById(R.id.editText3);
String yy = editText.getText().toString().trim();
String shitts = listView.getItemAtPosition(position).toString();
try {
String[] a = shitts.split(", ");
String[] b = a[1].split("=");
String[] sep = a[0].split("=");
String betnumber = sep[1];
String betamount= b[1];
if (view != null) {
checkBox.setChecked(!checkBox.isChecked());
if(checkBox.isChecked()){
//sort number
final String sorted = betnumber.chars().sorted().mapToObj(c -> Character.valueOf((char)c).toString()).collect(Collectors.joining());
System.out.println(sorted);
//check if double digit
Boolean checker = doubleChecker(sorted);
if (checker == true){
Toast.makeText(getApplicationContext(),"DOUBLE DIGIT", LENGTH_SHORT).show();
int answer = Integer.parseInt(betamount) / 3;
tv3.setText(String.valueOf(answer));
}else{
Toast.makeText(getApplicationContext(),"NOT DOUBLE DIGIT", LENGTH_SHORT).show();
int answer;
if(yy.equals("")){
answer = Integer.parseInt(betamount) / 6;
tv3.setText(String.valueOf(answer));
}else{
answer = (Integer.parseInt(betamount) - Integer.parseInt(yy)) / 6;
tv3.setText(String.valueOf(answer));
}
}
//TODO save to array to send
}else{
//TODO mistake RETURN tv3 to old value
}
}
}catch (Exception e){
}
}
});
Here's my adapter.
class MyAdapter extends BaseAdapter {
private ArrayList<HashMap<String, String>> mData;
public MyAdapter(ArrayList<HashMap<String, String>> mData2) {
this.mData = mData2;
}
#Override
public int getCount() {
return mData.size();
}
#Override
public Object getItem(int i) {
return this.mData.get(i);
}
#Override
public long getItemId(int i) {
return i;
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
view = getLayoutInflater().inflate(R.layout.row_layout, null);
TextView tx_number = (TextView) view.findViewById(R.id.tx_number);
TextView tx_amount = (TextView) view.findViewById(R.id.tx_amount);
TextView tx_counter = (TextView) view.findViewById(R.id.tx_counter);
String betid = mData.get(i).get("betid");
if(betid!=null){
String betnumber = mData.get(i).get("betnumber");
String amountTarget = mData.get(i).get("amountTarget");
String amountRamble = mData.get(i).get("amountRamble");
tx_number.setText(betnumber);
tx_amount.setText(amountTarget);
tx_counter.setText(amountRamble);
}
return view;
}
}

Replace your adapter code with:
public class MyAdapter extends BaseAdapter {
private ArrayList<HashMap<String, String>> mData;
public MyAdapter(ArrayList<HashMap<String, String>> mData2) {
this.mData = mData2;
}
#Override
public int getCount() {
return mData.size();
}
#Override
public Object getItem(int i) {
return this.mData.get(i);
}
#Override
public long getItemId(int i) {
return i;
}
#Override
public View getView(int i, View convertView, ViewGroup viewGroup) {
View mView = convertView;
String betid = mData.get(i).get("betid");
ViewHolder holder ;
if (mView == null) {
Context context = viewGroup.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
mView = inflater.inflate(R.layout.row_layout, null,false);
holder = new ViewHolder();
holder.tx_number = (TextView) mView.findViewById(R.id.tx_number);
holder.tx_amount = (TextView) mView.findViewById(R.id.tx_amount);
holder.tx_counter = (TextView) mView.findViewById(R.id.tx_counter);
mView.setTag(holder);
} else {
holder = (ViewHolder) mView.getTag();
}
if (betid != null) {
String betnumber = mData.get(i).get("betnumber");
String amountTarget = mData.get(i).get("amountTarget");
String amountRamble = mData.get(i).get("amountRamble");
holder.tx_number.setText(betnumber);
holder.tx_amount.setText(amountTarget);
holder.tx_counter.setText(amountRamble);
}
return mView;
}
private static class ViewHolder {
TextView tx_number;
TextView tx_amount;
TextView tx_counter;
}
}
I added new code with ViewHolder.

How avoid refresh checkbox while expand list in android

I'm making NLevel expandable list using listview. I've added checkbox only last level data in list view. I have stuck in below scenario.
If I check checkbox then when I expand listview means checkbox gets automatically unchecked.I don't want it to be like that. If I checked checkbox it should stay checked until I uncheck manually.
Please anyone help me!! It's been two days I stuck here.
Here goes my code:
MainActivity.java
public class MainActivity extends Activity {
List<NLevelItem> list;
ListView listView;
Context context;
Button checkButton;
ArrayList<String>tempList;
CheckBox selected = null; //Make only one selection at a time
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView1);
list = new ArrayList<NLevelItem>();
context = this;
checkButton = (Button)findViewById(R.id.buttons);
tempList = new ArrayList<String>();
//here we create 5 grandparent (top level) NLevelItems
//then foreach grandparent create a random number of parent (second level) NLevelItems
//then foreach parent create a random number of children (third level) NLevelItems
//we pass in an anonymous instance of NLevelView to the NLevelItem, this NLevelView is
//what supplies the NLevelAdapter with a View for this NLevelItem
Random rng = new Random();
final LayoutInflater inflater = LayoutInflater.from(this);
for (int i = 0; i < 5; i++) {
final NLevelItem grandParent = new NLevelItem(new SomeObject("GrandParent "+i),null, new NLevelView() {
#Override
public View getView(NLevelItem item) {
View view = inflater.inflate(R.layout.list_item, null);
TextView tv = (TextView) view.findViewById(R.id.textView);
//tv.setBackgroundColor(Color.GREEN);
String name = (String) ((SomeObject) item.getWrappedObject()).getName();
tv.setText(name);
return view;
}
});
list.add(grandParent);
int numChildren = rng.nextInt(4) + 1;
for (int j = 0; j < numChildren; j++) {
NLevelItem parent = new NLevelItem(new SomeObject("Parent "+j),grandParent, new NLevelView() {
#Override
public View getView(NLevelItem item) {
View view = inflater.inflate(R.layout.list_item, null);
TextView tv = (TextView) view.findViewById(R.id.textView);
//tv.setBackgroundColor(Color.YELLOW);
String name = (String) ((SomeObject) item.getWrappedObject()).getName();
tv.setText(name);
return view;
}
});
list.add(parent);
int children = rng.nextInt(3)+1;
for(int x=0; x<children;x++){
final NLevelItem childs = new NLevelItem(new SomeObject("Parent1 "+x),parent, new NLevelView() {
#Override
public View getView(NLevelItem item) {
View view = inflater.inflate(R.layout.list_item, null);
TextView tv = (TextView) view.findViewById(R.id.textView);
//tv.setBackgroundColor(Color.BLUE);
String name = (String) ((SomeObject) item.getWrappedObject()).getName();
tv.setText(name);
return view;
}
});
list.add(childs);
int grandChildren = rng.nextInt(5)+1;
for( int k = 0; k < grandChildren; k++) {
NLevelItem child = new NLevelItem(new SomeObject("child "+k),childs, new NLevelView() {
#Override
public View getView(NLevelItem item) {
View view = inflater.inflate(R.layout.check_list, null);
TextView tv = (TextView) view.findViewById(R.id.checktextView);
final String name = (String) ((SomeObject) item.getWrappedObject()).getName();
final CheckBox checkBox = (CheckBox)view.findViewById(R.id.check);
checkBox.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(selected != null){ //Edit
selected.setChecked(false);
}
selected = checkBox; //Edit
if(checkBox.isChecked()){
tempList.add((String) ((SomeObject)childs.getWrappedObject()).getName()+"+"+name);
}
else {
tempList.remove((String) ((SomeObject)childs.getWrappedObject()).getName()+"+"+name);
}
}
});
//tv.setBackgroundColor(Color.GRAY);
tv.setText(name);
return view;
}
});
list.add(child);
}
}
}
}
NLevelAdapter adapter = new NLevelAdapter(list);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
((NLevelAdapter)listView.getAdapter()).toggle(arg2);
((NLevelAdapter)listView.getAdapter()).getFilter().filter();
}
});
checkButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
for (int i=0;i<tempList.size();i++){
Toast.makeText(context,tempList.get(i),Toast.LENGTH_LONG).show();
}
}
});
}
class SomeObject {
public String name;
public SomeObject(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
}
NLevelAdapter.java
public class NLevelAdapter extends BaseAdapter {
List<NLevelItem> list;
List<NLevelListItem> filtered;
public void setFiltered(ArrayList<NLevelListItem> filtered) {
this.filtered = filtered;
}
public NLevelAdapter(List<NLevelItem> list) {
this.list = list;
this.filtered = filterItems();
}
#Override
public int getCount() {
return filtered.size();
}
#Override
public NLevelListItem getItem(int arg0) {
return filtered.get(arg0);
}
#Override
public long getItemId(int arg0) {
return 0;
}
#Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
return getItem(arg0).getView();
}
public NLevelFilter getFilter() {
return new NLevelFilter();
}
class NLevelFilter {
public void filter() {
new AsyncFilter().execute();
}
class AsyncFilter extends AsyncTask<Void, Void, ArrayList<NLevelListItem> > {
#Override
protected ArrayList<NLevelListItem> doInBackground(Void...arg0) {
return (ArrayList<NLevelListItem>)filterItems();
}
#Override
protected void onPostExecute(ArrayList<NLevelListItem> result) {
setFiltered(result);
NLevelAdapter.this.notifyDataSetChanged();
}
}
}
public List<NLevelListItem> filterItems() {
List<NLevelListItem> tempfiltered = new ArrayList<NLevelListItem>();
OUTER: for (NLevelListItem item : list) {
//add expanded items and top level items
//if parent is null then its a top level item
if(item.getParent() == null) {
tempfiltered.add(item);
} else {
//go through each ancestor to make sure they are all expanded
NLevelListItem parent = item;
while ((parent = parent.getParent())!= null) {
if (!parent.isExpanded()) {
//one parent was not expanded
//skip the rest and continue the OUTER for loop
continue OUTER;
}
}
tempfiltered.add(item);
}
}
return tempfiltered;
}
public void toggle(int arg2) {
filtered.get(arg2).toggle();
}
}
Thanks in advance!!

i think you need to store the checkbox state in a boolean (is checked), and reflect that on the view, when getView() is called.
1- Add boolean checked to NLevelItem :
private boolean checked = false;
//add setter: setChecked(boolean)
//add getter isChecked()
2- Use that boolean in getView() (last one where checkbox is added)
#Override
public View getView(final NLevelItem item) {
// .......
final CheckBox checkBox = (CheckBox)view.findViewById(R.id.check);
checkBox.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//store checkbox state, note that NLevelItem item might need to be defined with 'final'
item.setChecked(checkBox.isChecked());
if(checkBox.isChecked()){
tempList.add((String) ((SomeObject)childs.getWrappedObject()).getName()+"+"+name);
}
else {
tempList.remove((String) ((SomeObject)childs.getWrappedObject()).getName()+"+"+name);
}
}//onClick()
}//setOnClickListener()
//update checkbox state from the corresponding NLevelItem
checkBox.setChecked(item.isChecked());
//.......
}//getView()
-EDIT:
to select 1 item, you need to iterate all items, set checked = false, but 1
i am not sure if you have to do it on:
List<NLevelItem> list;
or
List<NLevelListItem> filtered;
in the adapter class
private void selectOnly(int position){
for(int a=0;a<list.size();a++){
if(a == position){
list.get(a).setChecked(true);
continue;
}
list.get(a).setChecked(false);
}//for loop
notifyDataSetChanged(); // to update views (checkbox state)
}
Usage: selectOnly(15);

Use ViewHolder class to set and get Tag like this:
public class ListAdapter extends BaseAdapter {
private Context con;
private List<String> dataLt;
private static LayoutInflater inflater = null;
public ListAdapter(Context context, List<String> dataList){
con = context;
dataLt = dataList;
inflater = (LayoutInflater)con.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return dataLt.size();
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
ViewHolder holder;
if(convertView==null){
/****** Inflate tabitem.xml file for each row ( Defined below ) *******/
vi = inflater.inflate(R.layout.list_item_search, null);
/****** View Holder Object to contain tabitem.xml file elements ******/
holder = new ViewHolder();
holder.textView = (TextView) vi.findViewById(R.id.textView);
/************ Set holder with LayoutInflater ************/
vi.setTag( holder );
}
else
holder=(ViewHolder)vi.getTag();
return vi;
}
public static class ViewHolder{
TextView textView;
}
}
Hope this may help.

detecting ParseObject in Custom List View

In each row, I have a button and a textView. When the Button is clicked, It successfully sets the textView to a new value in that row. However, When I call ParseQuery() in GetView(); and try to do object.put("objectName", num) The only value that is populated to my Parse-Server is the last row. My SetTag(); and GetTag(); and ViewHolder class is correct When I click the button, I believe android studio is unsure of which row's TextView to populate so it just automatically populates the last row's TextView.
Custom ListView Adapter Class
public class CustomFeedListViewAdapter extends BaseAdapter {
String likesString;
int position;
private Context mContext;
private ArrayList<HashMap<String, String>> feed;
private static LayoutInflater inflater = null;
ParseObject parseObFeed;
public CustomFeedListViewAdapter(Context context, ArrayList<HashMap<String, String>> data) {
super();
this.mContext = context;
this.feed = data;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return feed.size();
}
#Override
public Object getItem(int i) {
return feed.get(i);
}
#Override
public long getItemId(int i) {
return i;
}
#Override
public View getView(final int i, View view, ViewGroup viewGroup) {
position = i;
final ViewHolder holder;
if (view == null) {
view = inflater.inflate(R.layout.feed_list_row, viewGroup, false);
holder = new ViewHolder();
holder.feedProfilePic = (ImageView) view.findViewById(R.id.feedProfilePic);
holder.feedUsername = (TextView) view.findViewById(R.id.feedUsernameId);
holder.feedNumOfLikes = (TextView) view.findViewById(R.id.feedNumofLikes);
holder.feedUpVoteButton = (Button) view.findViewById(R.id.feedUpVoteButton);
view.setTag(holder);
HashMap<String, String> mFeed = new HashMap<>();
mFeed = feed.get(i);
holder.feedNumOfLikes.setText(mFeed.get("likes"));
likesString = mFeed.get("likes");
holder.mLikes = Integer.valueOf(likesString);
position = i;
}
else{
position = i;
holder = (ViewHolder) view.getTag();
}
holder.feedUpVoteButton.setTag(position);
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("FeedItem");
query.addDescendingOrder("createdAt");
query.findInBackground(new FindCallback<ParseObject>() {
#Override
public void done(List<ParseObject> objects, ParseException e) {
if(e == null){
for (final ParseObject object : objects) {
holder.feedUpVoteButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ParseObject[] mParseObject = new ParseObject[feed.size()];
int pos = (Integer) v.getTag();
mParseObject[pos] = object;
holder.likes[pos] = holder.mLikes;
mParseObject[pos].put("likes", holder.likes[pos]);
mParseObject[pos].saveInBackground();
holder.feedNumOfLikes.setText(String.valueOf(holder.likes[pos]
));
}
});
}
}
}
});
return view;
}
class ViewHolder {
ImageView feedProfilePic;
TextView feedUsername;
TextView feedNumOfLikes;
TextView feedFeedItem;
TextView feedDate;
TextView feedNumofReplies;
Button feedUpVoteButton;
Button feedDownVoteButton;
Button feedCommentButton;
ListView feedListView;
int likes[] = new int[feed.size()];
int mLikes;
}
}

changes intended on one row but effects are showing in next row

hi friends i am not able to understand how to set text in the same row of the list view where i am having two button with text view at the center but when i am trying to increment or decrement the effect is showing on the next row but not the row on which i want the changes to be applied
CartAdapter.java
public class Cart_Adapter extends BaseAdapter {
Context cartcontext;
List<MobiData> cartlist;
LayoutInflater inflater;
cartlist cartdata;
public ArrayList<Integer> quantity = new ArrayList<Integer>();
CustomButtonListener customButtonListener;
public Cart_Adapter(Context cartcontext, List<MobiData> cartlist) {
this.cartcontext = cartcontext;
this.cartlist = cartlist;
}
#Override
public int getCount() {
return cartlist.size();
}
#Override
public Object getItem(int position) {
return cartlist.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
inflater = (LayoutInflater) cartcontext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
cartdata = new cartlist();
convertView = inflater.inflate(R.layout.cart_row, parent, false);
cartdata.decrement = (TextView) convertView.findViewById(R.id.decrement);
cartdata.single = (TextView) convertView.findViewById(R.id.single);
cartdata.single.setTag(position);
cartdata.increment = (TextView) convertView.findViewById(R.id.increment);
cartdata.increment.setTag(position);
cartdata.cancel = (TextView) convertView.findViewById(R.id.cancel);
cartdata.vcmedname = (TextView) convertView.findViewById(R.id.vcmedname);
cartdata.vcmedprice = (TextView) convertView.findViewById(R.id.vcmedprice);
Typeface carttext = Typeface.createFromAsset(cartcontext.getAssets(), "fonts/fontawesome.ttf");
cartdata.decrement.setTypeface(carttext);
cartdata.increment.setTypeface(carttext);
cartdata.cancel.setTypeface(carttext);
convertView.setTag(cartdata);
} else {
cartdata = (cartlist) convertView.getTag();
}
MobiData newcart = cartlist.get(position);
cartdata.vcmedname.setText(newcart.getVcmedname());
cartdata.vcmedprice.setText(newcart.getVcmedprice());
cartdata.single.setText(newcart.getVcqty());
final String cartids = newcart.getVcmedid();
cartdata.cancel.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
cartlist.remove(position);
notifyDataSetChanged();
}
});
cartdata.increment.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick( View v) {
if (customButtonListener !=null){
int plus = Integer.parseInt(cartdata.single.getText().toString());
plus++;
int plus = Integer.parseInt(cartdata.single.getText().toString());
plus++;
cartdata.single.setText(String.valueOf(plus));
SharedPreferences viewpref = cartcontext.getSharedPreferences("datapref", Context.MODE_PRIVATE);
String cartuid = viewpref.getString("uid", "");
String carttempid = viewpref.getString("tempid", "");
String incremnturl = "http://sampletemplates.net/mobichemist/json/cart_process.php?mid=" + cartids + "&userid=" + cartuid + "&tempid=" + carttempid;
Log.d("Incremnturl", incremnturl);
JsonArrayRequest incrementarray = new JsonArrayRequest(Request.Method.GET, incremnturl, (String) null, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
for (int i = 0; i < response.length(); i++) {
try {
JSONObject incrobj = response.getJSONObject(i);
int plus = Integer.parseInt(cartdata.single.getText().toString());
plus++;
cartdata.single.setText(String.valueOf(plus));
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.d("Incrementurl", String.valueOf(error));
}
});
incrementarray.setRetryPolicy(new DefaultRetryPolicy(50000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
AppController.getInstance().addToRequestQueue(incrementarray);
}
});
cartdata.decrement.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int i = Integer.parseInt(cartdata.single.getText().toString());
i--;
if (i <= 0) {
Toast.makeText(Single_Cart_Page.this, "Minimum Quantity is 1", Toast.LENGTH_SHORT).show();
} else {
cartdata.single.setText(String.valueOf(i));
}
}
});
return convertView;
}
static class cartlist {
TextView decrement, single, increment, cancel, vcmedname, vcmedprice;
}

try this and add your other code.
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.cart_row, parent, false);
holder = new ViewHolder();
holder.decrement = (TextView) convertView.findViewById(R.id.decrement);
holder.single = (TextView) convertView.findViewById(R.id.single);
holder.increment = (TextView) convertView.findViewById(R.id.increment);
holder.cancel = (TextView) convertView.findViewById(R.id.cancel);
holder.vcmedname = (TextView) convertView.findViewById(R.id.vcmedname);
holder.vcmedprice = (TextView) convertView.findViewById(R.id.vcmedprice);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
Typeface carttext = Typeface.createFromAsset(cartcontext.getAssets(), "fonts/fontawesome.ttf");
holder.decrement.setTypeface(carttext);
holder.increment.setTypeface(carttext);
holder.cancel.setTypeface(carttext);
MobiData newcart = cartlist.get(position);
holder.vcmedname.setText(newcart.getVcmedname());
holder.vcmedprice.setText(newcart.getVcmedprice());
holder.single.setText(newcart.getVcqty());
final String cartids = newcart.getVcmedid();
holder.cancel.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
cartlist.remove(position);
notifyDataSetChanged();
}
});
return convertView;
}
static class ViewHolder {
private TextView decrement;
private TextView single;
private TextView increment;
private TextView vcmedname;
private TextView vcmedprice;
}

Use ArrayAdaper instead of Base Adapter with ViewHolder. Don't set setTag(position) manually for all views.
Find ViewHolder example here https://dzone.com/articles/optimizing-your-listview .It will solve your indexing problem. ViewHolder class sets all views position. Also find more description on Hold View Objects in a View Holder

EditText works correctly in ListView but CheckBoxes do not

So I have a custom list adapter, and I've learned that attaching listeners to particular items in that list is incredibly confusing. I understand that ListView recycles views, and that you must reference each item using a holder and a reference for that item. My EditTexts work when I scroll, but my CheckBoxes take the value of recycled views. Here is my code. Everything displays correctly, so it's not an XML issue.
public void changeMate(View view) {
View parent = (View)view.getParent();
CheckBox box = (CheckBox)view;
CheckBox mate;
if (view.getId()==R.id.trueBox) mate = (CheckBox) parent.findViewById(R.id.falseBox);
else mate = (CheckBox) parent.findViewById(R.id.trueBox);
mate.setChecked(!box.isChecked());
TextView label = (TextView)parent.findViewById(R.id.atomName);
// MainActivity.atoms[(int)label.getText().charAt(0)-'A'].immutableTruth=box.getId()==R.id.trueBox;
MainActivity.atoms[(int)label.getText().charAt(0)-'A'].immutableTruth=((CheckBox)findViewById(R.id.trueBox)).isChecked();
MainActivity.atoms[(int)label.getText().charAt(0)-'A'].valueSet=true;
c.put((int)label.getText().charAt(0)-'A',MainActivity.atoms[(int)label.getText().charAt(0)-'A'].immutableTruth);
}
public void kill(View view) {
try {
finish();
} catch (Throwable throwable) {
throwable.printStackTrace();
}
}
public void handleChanges(View view) {
}
static class AtomViewer extends ArrayAdapter<Atom> {
private ArrayList<Atom> objects;
public AtomViewer(Context context, int resource, ArrayList objects) {
super(context, resource, objects);
this.objects = objects;
}
#Override
public View getView(int position, View convertView, final ViewGroup parent) {
// assign the view we are converting to a local variable
View v = convertView;
final ViewHolder holder;
// first check to see if the view is null. if so, we have to inflate it.
// to inflate it basically means to render, or show, the view.
if (v == null) {
holder=new ViewHolder();
LayoutInflater inflater = (LayoutInflater) `enter code here` getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.atom_view, null);
holder.editText1= (EditText) convertView.findViewById(R.id.definition);
convertView.setTag(holder);
} else holder= (ViewHolder) convertView.getTag();
v=convertView;
holder.ref=position;
CheckBox tb = (CheckBox) v.findViewById(R.id.trueBox);
CheckBox fb = (CheckBox) v.findViewById(R.id.falseBox);
holder.tb=tb;
holder.fb=fb;
TextView name = (TextView) v.findViewById(R.id.atomName);
Atom i = objects.get(position);
holder.editText1.setText(e.valueAt(position));
holder.editText1.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
#Override
public void afterTextChanged(Editable s) {
e.setValueAt(holder.ref, s);
}
});
{
if (!i.valueSet)
{
holder.fb.setChecked(!i.truth);
holder.tb.setChecked(i.truth);
}
boolean truth = c.get(position);
if (truth&&i.valueSet) {
holder.fb.setChecked(false);
holder.tb.setChecked(true);
}
else if(!truth)
{
holder.fb.setChecked(true);
holder.tb.setChecked(false);
}
CharSequence t = String.valueOf(i.getname());
name.setText(t);
if (i.dictionaryValue != null) ``holder.editText1.setText(i.dictionaryValue);
}
`return v;
}
}
public static Atom[] atoms;
public ArrayList<Atom> mParts = new ArrayList<Atom>();
public AtomViewer mAdapter;
public ListView listView;
public static SparseArray<Editable> e = new SparseArray<>(26);
public static SparseBooleanArray c = new SparseBooleanArray(26);
#Override
protected void onCreate(Bundle stuff) {
super.onCreate(null);
setContentView(R.layout.activity_info);
Intent i = getIntent();
getWindow().getDecorView().setSaveEnabled(false);
Bundle b=i.getExtras();
atoms=MainActivity.atoms;
String arg = b.getString("Argument");
String conc = b.getString("Conclusion");
TextView tv = (TextView) findViewById(R.id.argText);
tv.setText(arg);
tv = (TextView) findViewById(R.id.concText);
tv.setText(conc);
tv=(TextView)findViewById(R.id.valid);
tv.setText(b.getString("Validity"));
tv=(TextView)findViewById(R.id.sound);
tv.setText(b.getString("Soundness"));
//int index = 0;
for (Atom a:atoms
) {
if(a!=null) {
if(a.valueSet) c.put(a.ID,a.immutableTruth); else c.put(a.ID,a.truth);
mParts.add(a);
}
}
ArrayAdapter<Atom> arrayAdapter = new `enter code here`AtomViewer(this,R.layout.atom_view,mParts);
listView= (ListView) findViewById(R.id.list);
listView.setAdapter(arrayAdapter);
listView.getCheckedItemPositions();
}
private static class ViewHolder {
EditText editText1;
CheckBox tb,fb;
int ref;
}
}

Edit your code, move
holder.ref=position;
CheckBox tb = (CheckBox) v.findViewById(R.id.trueBox);
CheckBox fb = (CheckBox) v.findViewById(R.id.falseBox);
holder.tb=tb;
holder.fb=fb;
TextView name = (TextView) v.findViewById(R.id.atomName);
inside if (v == null)