//the following function 'listens to the click' - here we are using an 'item click listener' which gives you a number of which one was clicked
        lv_customerList.setOnItemClickListener((parent, view, position, id) -> {
            //getting the customer that was just clicked to send it to the method to delete
            //the parent of the listener is the listview
            CustomerModel clickedCustomer = (CustomerModel) parent.getItemAtPosition(position); //this tells me which person was just clicked
            //now we call the "deleteOne" function from the databaseHelper class
            dataBaseHelper.deleteOne(clickedCustomer);
            //now we update the list view
            ShowCustomersOnListView(dataBaseHelper);
            Toast.makeText(MainActivity.this, "Deleted" + clickedCustomer,Toast.LENGTH_SHORT).show();
        });

这是主活动中的代码

//creating a new function that will delete contents from a database
    public boolean deleteOne(CustomerModel customerModel) {
        //find customerModel in the database. if is is found, delete it and return true, otherwise return false

        SQLiteDatabase db = this.getWritableDatabase();
        String queryString = "DELETE FROM" + CUSTOMER_TABLE + "WHERE"  + CUSTOMER_ID + " = " + customerModel.getId();

        Cursor cursor = db.rawQuery(queryString, null);

        if (cursor.moveToFirst()) {
            return true;
        }
        else {
            return false;
        }
    }

这是来自DatabaseHelper活动的代码
我遵循了https://youtu.be/312RhjfetP8教程，并完全复制了代码（尽管Android IDE建议更改...

new AdapterView.OnItemClickListener()

转换为lambda（在mainactivity的方法中）
但现在每当我点击应用程序中的一行（看视频了解我的意思）-应用程序只是崩溃，我不知道为什么：（
有人能帮帮我吗？
太感谢你了！