r - How to keep running a shinyMobile app on a smartphone with turned off screen?

Question

I am running a shinyMobile app (on an Android smartphone, using the internal browser, running on shinyapps.io) using the leaflet.extras package to retrieve GPS location data. That is working fine, as long as the screen is turned on.

When the screen is turned off, no further locations are checked.

When I turn again the screen on, the process continues to run without issues.

Is there a way to continue monitoring the GPS location with screen turned off?

The code:

library(leaflet)
library(leaflet.extras)
library(shiny)
library(shinyMobile)

ui <- f7Page(
  title = "Tracker",
  f7SingleLayout(
    navbar = f7Navbar(title = "Tracker"),
    leafletOutput('map'),
    tableOutput("table")
  ) 
) 

server <- function(input, output, session) {

  # track df creation
  track <- reactiveValues(pos=data.frame(matrix(ncol = 3,
                                                nrow = 0)),count =1)
  # creating df for a single point  
   newpos <- reactive({
     data.frame(
       id = track$count,
       lon = input$map_gps_located$coordinates$lng,
       lat = input$map_gps_located$coordinates$lat)
   }) 
   
   # adding a point to the track
   storedValues <- observeEvent(input$map_gps_located$coordinates, {
     track$pos <- rbind(track$pos, newpos())
     track$count <- track$count +1
   })
 
   # track
   output$table <- renderTable({track$pos})
     
   #plotting the map
   output$map <- renderLeaflet({ 
    leaflet()%>%
    addTiles() %>% 
    addControlGPS(options = gpsOptions(position = "topleft", activate = TRUE, 
                                         autoCenter = TRUE, maxZoom = 60, 
                                         setView = TRUE))
    })
 
}

shinyApp(ui, server)

question from:https://stackoverflow.com/questions/65647454/how-to-keep-running-a-shinymobile-app-on-a-smartphone-with-turned-off-screen

Answer 1

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