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calculate value based on current and previous row in cursor android


calculate value based on current and previous row in cursor android

By : user2956405
Date : November 22 2020, 10:56 AM
I hope this helps . Ok, i thought of posting an answer of what i was telling you in the comments. ope this helps you somehow.
assuming you have a layout file custom_row.xml to represent each item in the list and in this layout you have 3 textviews, say txtDate, txtSpend and txtDif: your data list is an ArrayList where SpendingItem have (Date, Spend), and in the adapter class it's called items
code :
@override
public View getView(int position, View convertView, ViewGroup parent){
        //convertView == null or not, init ViewHolder, setTag or getTag (in case you are usin this approach to recycle views).

        //here comes the calculations:
        holder.txtDate.setText(items.get(position).getDate());
        holder.txtSpend.setText(items.get(position).getSpend() + "");//as getSpend() return int
        if(items.size() > position+1){
            holder.txtDif.setText((items.get(position+1).getSpend() - items.get(position).getSpend()) + "");
        //result is int, to avoid considering this int as a resource int (in strings xml file) or you can use Integer.toString()
        }else{
            holder.txtDif.setText("N/A");
        }

        // some other code ...

        return convertView;
}
@Override
public void bindView(View arg0, Context context, Cursor cursor) {
    //here comes the calculations:
    holder.txtDate.setText(cursor.getString(1));
    holder.txtSpend.setText(cursor.getInt(2) + "");
    final int currentSpen = cursor.getInt(2); // conside index 2 is spending value in cursor
    if(cursor.moveToNext()){
        holder.txtDif.setText((cursor.getInt(2) - currentSpen) + "");
        cursor.moveToPrevious();//return to current position so you will not skip a row from cursor
    }else{
        holder.txtDif.setText("N/A");
    }

    // some other code ...
}


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cursor to update a row with values from the previous and current rows

cursor to update a row with values from the previous and current rows


By : Laurence Thomas
Date : March 29 2020, 07:55 AM
I wish this help you Fellow Query Writers, , OK, Try this.
code :
CREATE TABLE MyTable (Id INT Identity, Col2 int, Col3 int)

INSERT INTO MyTable (Col2, Col3)
VALUES (2,1), (3,0), (4,0),(5,0),(6,0)

SELECT * from MyTable

WHILE (SELECT COUNT(*) FROM MyTable WHERE Col3=0) > 0
BEGIN
    UPDATE TOP (1) MyTable
    SET CoL3 = (Mytable.col2 + (select col3 from mytable t2 where (t2.id = mytable.id-1)))
    WHERE Col3 = 0
END

SELECT * from MyTable
Android DatePicker : Disabling the PREVIOUS dates based on the CURRENT date

Android DatePicker : Disabling the PREVIOUS dates based on the CURRENT date


By : Subhasish Pal
Date : March 29 2020, 07:55 AM
will help you I have a DatePicker in my app which is set in this way :
code :
private DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {
    // the callback received when the user "sets" the Date in the
    // DatePickerDialog
    public void onDateSet(DatePicker view, int yearSelected,
            int monthOfYear, int dayOfMonth) {
        year = yearSelected;
        month = monthOfYear + 1;
        day = dayOfMonth;
        // Set the Selected Date in Select date Button
        txtarrivedate.setText(year + "-" + month + "-" + day);
    }
};
   @Override
   protected Dialog onCreateDialog(int id) {
    switch (id) {
    case 1:
        // create a new DatePickerDialog with values you want to show

        DatePickerDialog da = new DatePickerDialog(this, mDateSetListener,
                mYear, mMonth, mDay);
        Calendar c = Calendar.getInstance();

        c.add(Calendar.DATE, 1);
        Date newDate = c.getTime();
        da.getDatePicker().setMinDate(newDate.getTime());
        return da;
        // create a new TimePickerDialog with values you want to show
    case 2:
        // create a new DatePickerDialog with values you want to show
        DatePickerDialog da1 = new DatePickerDialog(this,
                mDateSetListener2, mYear, mMonth, mDay);
        Calendar c1 = Calendar.getInstance();

        c1.add(Calendar.DATE, 1);
        Date newDate2 = c1.getTime();
        da1.getDatePicker().setMinDate(newDate2.getTime());
        return da1;

    }
    return null;
}
Android Spinner : Show toast if the user select previous hour or minutes based on CURRENT time

Android Spinner : Show toast if the user select previous hour or minutes based on CURRENT time


By : Poonam
Date : March 29 2020, 07:55 AM
To fix the issue you can do I have two spinners with id's hh and mm and with global array list , You have this in your condition:
code :
 if(position<hour)
                     {
                         Toast.makeText(OnlineBooking.this, "Choose greater hour",
                                    Toast.LENGTH_LONG).show();

    }
 String hourSelected = pickup_hour[position];
 if(Integer.parseInt(hourSelected)<hour)
                     {
                         Toast.makeText(OnlineBooking.this, "Choose greater hour",
                                    Toast.LENGTH_LONG).show();

    }
How to calculate current value on object based on previous conditions?

How to calculate current value on object based on previous conditions?


By : Melifaro
Date : March 29 2020, 07:55 AM
This might help you Assuming that no new data will be added after this runs (!!), execute the for-loop backwards:
code :
for (int i = databaseData.Count() - 1; i > 0; i--)
{
    databaseData[i].SoldTickets = databaseData[i].SoldTickets - databaseData[i - 1].SoldTickets;
}
How to calculate new column based on ratio between current and previous row using library(dplyr) in panel data?

How to calculate new column based on ratio between current and previous row using library(dplyr) in panel data?


By : Mikhail Protsenko
Date : March 29 2020, 07:55 AM
it fixes the issue I would like to create a new column grouped by Name as follows: , We need to use parentheses around 1+lag(contribution)
code :
data %>%
    group_by(Name) %>% 
    mutate(change = (contribution - lag(contribution))/(1+ lag(contribution)))
#    Name      dates contribution        new
#   <fctr>     <date>        <dbl>      <dbl>
#1    Andy 2011-01-13            2         NA
#2    Andy 2011-01-14            3  0.3333333
#3    Andy 2011-01-15            2 -0.2500000
#4    Andy 2011-01-16            2  0.0000000
#5    Andy 2011-01-17            3  0.3333333
#6      Jo 2011-01-13            4         NA
#7      Jo 2011-01-14            5  0.2000000
#8      Jo 2011-01-15           10  0.8333333
#9      Jo 2011-01-16            4 -0.5454545
#10     Jo 2011-01-17           10  1.2000000
#11     Me 2011-01-13            1         NA
#12     Me 2011-01-14            2  0.5000000
#13     Me 2011-01-15            4  0.6666667
#14     Me 2011-01-16            1 -0.6000000
#15     Me 2011-01-17            5  2.0000000
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