Finding last written row in Google Spreadsheet API - google-sheets-api

Question

Is there any way to find the last row you have written in a google spreadsheet in Java?
I tried to do that by having a variable which I keep in another file and I update that every time I do another writing. Is there any other way?

Answer 1

Finding last written row in Google Spreadsheet API
I'll give you a concept first using REST calls but you'll have to apply that in Java.
Exceed the range of cells where you're writing.
So to find last written row between cells A1:A10, use the range A1:A11 or A1:B (using B means all the rows in cell A will be traversed).
Fetch a range of cells, using GET. Parse the response result. And get the length of the parsed values. The length will always indicate the last row since Sheetsv4 ignores blank/empty cells.
So example I have a range of cells between A1:A10. I wrote "hello" in A10. Following the concepts above I do this:
..
xhr.open('GET', 'https://sheets.googleapis.com/v4/spreadsheets/'+myspreadsheetId+'/values/Sheet1!A1:A10);
..
xhr.onload = function (oEvent) {
arrayBuffer = xhr.response;
myArray = JSON.parse(arrayBuffer);
console.log("last row is " + myArray.values.length)
.. //output is 'last row is 10'
This part of my XHR request returns 10. Now I know that the last written row in my sheet is A10.
To do this in Java use the solution based on this SO thread.
mService.spreadsheets().values().get("ID_SHEET", "Sheet1!A1:B").execute();
Also check this thread about writing on data cells using Java. I think it offers additional insight as well.