How to delete the item from database and listview by position - android-studio

Question

I need to delete the item from database and ListView. I can delete the item from ListView but i can't delete it from database. I think the problem is in getting the position of the item from the database i tried to do it in my own but it does not work. I don't know what should I do.Help me to slove this.
myDB = new DbHandler(this);
userList = new ArrayList<>();
data = myDB.getListContents();
numRows = data.getCount();
if (numRows == 0) {
Toast.makeText(AddCount.this, "No Items", Toast.LENGTH_LONG).show();
} else {
while (data.moveToNext()) {
user = new User(data.getString(1), data.getString(2));
userList.add(user);
}
}
adapter = new Two_columnListAdapter(this, R.layout.list_item_layout, userList);
listView.setAdapter(adapter);
adapter.notifyDataSetChanged();
listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
#Override
public boolean onItemLongClick(final AdapterView<?> arg0, View arg1, final int arg2, final long arg3) {
final AlertDialog.Builder delete = new AlertDialog.Builder(AddCount.this);
delete.setIcon(R.drawable.ic_baseline_delete_24);
delete.setTitle("Are you sure");
delete.setMessage("Do you want to delete this item?");
delete.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
DbHandler db = new DbHandler(getApplicationContext());
myDB.deleteData(userList.get(arg2));
userList.remove(arg2);
adapter.notifyDataSetChanged();
Toast.makeText(getApplicationContext(), "Deleted" ,Toast.LENGTH_SHORT).show();
}
});`
`Two_columnAdapter.java
public class Two_columnListAdapter extends ArrayAdapter<User> {
private LayoutInflater layoutInflater;
private ArrayList<User>users;
private int mviewResourceId;
public Two_columnListAdapter(Context context,int textViewResourceId,ArrayList<User>users){
super(context,textViewResourceId,users);
this.users = users;
layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mviewResourceId = textViewResourceId;
}
public View getView(int position, View convertView, ViewGroup parents){
convertView = layoutInflater.inflate(mviewResourceId,null);
User user= users.get(position);
if (user != null){
TextView text = (TextView)convertView.findViewById(R.id.title);
TextView num = (TextView)convertView.findViewById(R.id.value);
if (text != null){
text.setText(user.getText());
}
if (num != null){
num.setText(user.getNum());
}
}
return convertView;
}
DatabaseHelpher(delete the single row from database)
public void deleteData(String id) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_Inputs, KEY_ID + " =?", new String[]{id});
db.close();
}

Answer 1

You can save the return data inside a model class instead of a list. Then call the setOnLongClickListener in your adapter class, inside onBindViewHolder.
class listHolder extends RecyclerView.ViewHolder{
private View view;
public listHolder(#NonNull View itemView) {
super(itemView);
view = itemView;
}
}
#Override
public void onBindViewHolder(#NonNull listHolder listHolder, int position, #NonNull userModel userModel) {
viewHolder.view.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
// Do somethings....
}
});
For more info you can check out this link, Hope this helps!