recyclerview sqlite database, data deleted on recyclerview but not deleting in database - sqlite

Question

I want to delete both recyclerview and sqlite database, but the only recyclerview gets deleted.
When submitting a new record, the deleted records are visible.
Data is not deleted in the SQLite database.
How to delete data in SQLite database using recyclerview in android.
Here is my code.
AdapterClass
package com.example.recyclerviewsqlite;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHoder> {
private ArrayList<Model> modelArrayList;
private Context context;
DBmain dBmain;
public MyAdapter(ArrayList<Model> modelArrayList, Context context) {
this.modelArrayList = modelArrayList;
this.context = context;
}
#NonNull
#Override
public MyAdapter.ViewHoder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.singledata, parent, false);
return new ViewHoder(view);
}
#Override
public void onBindViewHolder(#NonNull MyAdapter.ViewHoder holder, int position) {
Model model = modelArrayList.get(position);
holder.txtname.setText(model.getSname());
holder.txtsub.setText(model.getSsubject());
//delete data
holder.txtimag.setOnClickListener(new View.OnClickListener() {
int newPosition = holder.getAdapterPosition();
#Override
public void onClick(View v) {
dBmain = new DBmain(context);
dBmain.delete(newPosition);
modelArrayList.remove(newPosition);
notifyItemRemoved(newPosition);
notifyItemRangeChanged(newPosition, modelArrayList.size());
}
});
}
#Override
public int getItemCount() {
return modelArrayList.size();
}
public class ViewHoder extends RecyclerView.ViewHolder {
private TextView txtname, txtsub;
private ImageView icon, txtimag;
public ViewHoder(#NonNull View itemView) {
super(itemView);
txtname = (TextView) itemView.findViewById(R.id.txtname);
txtsub = (TextView) itemView.findViewById(R.id.txtsub);
icon = (ImageView) itemView.findViewById(R.id.icon);
txtimag = (ImageView) itemView.findViewById(R.id.txtimg);
}
}
}
Database Class
package com.example.recyclerviewsqlite;
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import androidx.annotation.Nullable;
public class SqliteHelper extends SQLiteOpenHelper {
public static final String DBNAME="student";
public static final String TABLENAME="college";
public static final int VER=1;
public SqliteHelper(#Nullable Context context) {
super(context, DBNAME, null, VER);
}
#Override
public void onCreate(SQLiteDatabase db) {
String query="create table "+TABLENAME+"(id integer primary key, name text, subject text)";
db.execSQL(query);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
String query="drop table if exists "+TABLENAME+"";
db.execSQL(query);
}
public void delete(int id) {
SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
//deleting row
sqLiteDatabase.delete(TABLENAME, "id=" + id, null);
sqLiteDatabase.close();
}
}

Answer 1

for this check this soluion
public void remove(String Id){
SQLiteDatabase db = this.getWritableDatabase();
db.delete(PE.TABLE_NAME, PE.COLUMN_PLACE_ID + "=\"" + Id+"\"", null) ;
}
and call this method when u want to delete
private void delete(int position){
Dbhelper dbHelper = new Dbhelper(MainActivity.this);
dbHelper.removePlace(arraylist.get(position).getPlaceId());
arraylist.remove(position);
mAdapter.notifyDataSetChanged();
}