Getting nil online from the tableview

Solar2D Android
#1

Hello I would like to take a doubt, I have an app that scrapes the internet and I get a string in a variable and write it in a txt, so far so good, but when I try to display this string in a table, I always get nil, it doesn’t matter where in the code I include reading the string in the txt, and when looking inside the txt, the string is there! I realized that onRowRender executes the table line before reading the txt, even though this code is in show / did and the writing and reading of the string in the composer create.

Solar2D build 3590
macOS Catalina

#2

If you could put together a sample project and upload it here, we might be able to help. It’s hard to say something without seeing some code.

#3 
local composer = require("composer")
local widget = require( "widget" )

local scene = composer.newScene()

local page
local bg

function scene:create( event )

  local sceneGroup = self.view

  background = display.newRect(sceneGroup, 0, 0, display.contentWidth, display.contentHeight)
  background.anchorX = 0
  background.anchorY = 0
  background:setFillColor(1,0,0) 

  function networkListener( event )

    if ( event.isError ) then
      print( "Network error: ", event.response )
    else
      local dados = event.response

      local pageLimited = string.match(dados,"<h4 class=\"sub\">......................")

      local pageLimited2 = string.sub(pageLimited,18,38)

      local pageLimited3 = string.gsub(pageLimited2,"\n","")
      local dataFormatted = "Java: " ..  pageLimited3        

      local path = system.pathForFile( "versions.txt", system.DocumentsDirectory )
      local file, errorString = io.open( path, "w" )

      if not file then
        print( "File error: " .. errorString )
      else
        file:write( dataFormatted)
        io.close( file )
      end

      file = nil 
      
    end
  end  

  network.request( "https://www.java.com/pt_BR/download/", "GET", networkListener )

end

function scene:show( event )

  local sceneGroup = self.view
  local phase = event.phase

  if ( phase == "will" ) then

  elseif ( phase == "did" ) then

    local path = system.pathForFile( "versions.txt", system.DocumentsDirectory )

    local file, errorString = io.open( path, "r" )

    if not file then
     
      print( "File error: " .. errorString )
      
    else
      
      contents = file:read( "*a" )
     
      io.close( file )
      
    end

    file = nil

    local function onRowRender( event )

      local row = event.row

      local rowHeight = row.contentHeight
      local rowWidth = row.contentWidth

      local rowTitle = display.newText( row, contents, 0, 0, nil, 14 )
      rowTitle:setFillColor( 0 )

      rowTitle.anchorX = 0
      rowTitle.x = 8
      rowTitle.y = rowHeight * 0.5
      
    end 
    

    local tableView = widget.newTableView(
      {
        left = 0,
        top = display.contentCenterY + 20,
        height = display.contentHeight - display.contentCenterY + 12,
        width = display.contentWidth,
        onRowRender = onRowRender,
        onRowTouch = onRowTouch,
        listener = scrollListener
      }
    )

    for i = 1, 1 do

      tableView:insertRow{}

    end

  end

end 

function scene:hide( event )

  local sceneGroup = self.view
  local phase = event.phase

  if ( phase == "will" ) then

  elseif ( phase == "did" ) then

  end
end 

-- destroy()
function scene:destroy( event )

  local sceneGroup = self.view

end 

scene:addEventListener( "create", scene )
scene:addEventListener( "show", scene )
scene:addEventListener( "hide", scene )
scene:addEventListener( "destroy", scene )

return scene
#4

I’m sorry I didn’t understand what the problem is. It fails the first time because you check if the file exists and do nothing else so it takes a second run to work correctly. Also, it probably fails because you are not waiting for network request to complete before moving on. The code you posted does this in the second run.

1
1572×893 18.1 KB