在onitemlongclick监听器中删除listview和数据库中的值

Question

On clicking on ListView it deletes the value from ListView at index but not deleted that value from that index again.

for eg., it deletes the value from index 1 and again if I delete that value it doesn't delete from index 1. deleted from another index if selected other index

onItemLongClickListener (Book.class)

        lview.setOnItemLongClickListener(new 
        AdapterView.OnItemLongClickListener() {
            @Override
        public boolean onItemLongClick(AdapterView<?> adapterView, View 
           view, int i, long l) {

            String parse = String.valueOf(i);

            Integer deletedrows =  mydb.DeleteData(String.valueOf(i));
            if(deletedrows > 0 )
            {

                Toast.makeText(BookList.this, "deleted" + parse, Toast.LENGTH_SHORT).show();

            }
            else
            {

                Toast.makeText(BookList.this, "not Deleted" + parse, Toast.LENGTH_SHORT).show();
            }
            return true;
        }

Set data on list view (Book.class)

      public void getdata()
       {

     ListAdapter lviewAdapter;
    ArrayList<HashMap<String, String>> userList;

        userList = mydb.getalldata();
        if(userList.isEmpty())
        {
           showdata("Error","Nothing Found");
           return;
        }
         ArrayList list = new ArrayList();
        StringBuffer buffer = new StringBuffer();

       lviewAdapter = new SimpleAdapter(BookList.this, userList, 
        R.layout.book_custom_list,
            new String[]{"ID","url","title"},
            new int[]{  R.id.customid,R.id.customurl,R.id.customtitle});
       lview.setAdapter(lviewAdapter);


   }

getdata method (Database Helper.class)

   public ArrayList<HashMap<String, String>> getalldata()
    {
      SQLiteDatabase db = this.getWritableDatabase();
      ArrayList<HashMap<String, String>> userList = new ArrayList<>();
      Cursor cursor = db.rawQuery("select * from " + TABLE_NAME,null);

    while (cursor.moveToNext()){
        HashMap<String,String> user = new HashMap<>();
        user.put("ID",cursor.getString(cursor.getColumnIndex(Id_name)));

    user.put("title",cursor.getString(cursor.getColumnIndex(title_name)));
        user.put("url",cursor.getString(cursor.getColumnIndex(url_name)));
        userList.add(user);
    }
    return userList;

delete data also affected the id showing in the list view, want that to change the id to 1,2,3 in sequential form. thanks

Answer 1

Try this,

 lview.setOnItemLongClickListener(new 
    AdapterView.OnItemLongClickListener() {
        @Override
    public boolean onItemLongClick(AdapterView<?> adapterView, View 
       view, int i, long l) {

        String parse = String.valueOf(i);

        //Add this code when you try to delete the item

        try{
        SQLiteDatabase db = getWritableDatabase();
        String query = "delete from TABLE_NAME where id like "+"'"+(ListView_ID)+"'";
        db.delete(TABLE_ORDERS, KEY_LISTVIEW_ID + "='" + LISTVIEW_ID+ "'", null);
        Cursor cursor = db.rawQuery(query,null);
        cursor.close();

        //Now set the Data in the ListView from the database after you delete the item
        getFreshData();
    }
    catch (Exception e){
        Log.e("order_proof",""+e);
    }

        return true;
    }




private void getFreshData(){

 String query = "SELECT * FROM TABLE_NAME";
 ArrayList<HashMap<String, String>> userList = new ArrayList<>();
  Cursor cursor = db.rawQuery("select * from " + TABLE_NAME,null);

while (cursor.moveToNext()){
    HashMap<String,String> user = new HashMap<>();
    user.put("ID",cursor.getString(cursor.getColumnIndex(Id_name)));

user.put("title",cursor.getString(cursor.getColumnIndex(title_name)));
    user.put("url",cursor.getString(cursor.getColumnIndex(url_name)));
    userList.add(user);
}
return userList;

//populate this list in the ListView.
}

Let me know after you add this code @Harpreet.