Question

I would like to see if I can get a sample method written in Android that would achieve the following:

Loop through each row in a SQLlite table; grab the sum of all numbers;
to keep simple, lets say there are 3 columns with a numeric value in each row, and a forth that is simply the “row id” that should not be included.

(Let’s assume the table has been created and everything is set-up; just looking for the method that would do this. Lets sat the method outputs the number to a TextView on the activity that calls it).

Answer 1

Hope, you have basic knowledge and you can operate with Cursor.

1. Get Cursor with your data
2. Enumerate through each row
3. Enumerate through each columns
4. Calculate SUM

5. Set result to TextView

   long sum = 0;
   Cursor cursor = db.query(...); // or contentResolver.query(...)
   for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
       int columns = cursor.getColumnCount();
       for (int col = 0; col < columns; col++) {
           sum += cursor.getLong(col); // or cursor.getInt(col)
       }
   }
   cursor.close();
   
   textView.setText(String.valueOf(sum));