Is there a way to load multiple URL's in a for loop

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I'm trying to control RGB LED's with an ESP8266 module. But if i try to control multiple ESP8266 modules at once, the for loop only works for the last array element.

I've tried Toast.makeText(applicationContext, i.toString(), Toast.LENGTH_SHORT).show() and the loop only counts 2 also if i remove the if statement.

The toast itself works fine on the AVD but not on my Galaxy S8. The loading of all ips doesn't work on my phone and on the AVD. Every time i try to control multiple devices only the last one lights up. Here's my RGBActivity maybe I'm missing something.

iv_rgb.setOnTouchListener {
  event - >

  if (event.action == MotionEvent.ACTION_DOWN || event.action == MotionEvent.ACTION_MOVE) {

    bitmap = iv_rgb.drawingCache
    val pixel = bitmap.getPixel(event.x.toInt(), event.y.toInt())

    var r = ( * brightness) / 100
    var g = ( * brightness) / 100
    var b = ( * brightness) / 100

    val hex = "#" + Integer.toHexString(pixel)

    //color_layout.setBackgroundColor(Color.rgb(r, g, b))
    //color_view.text = "RGB: $r, $g, $b, \nHex: $hex\n${Devices.deviceIP[0]}"
    //Toast.makeText(this@RGBActivity, Devices.deviceIP[1], Toast.LENGTH_SHORT).show()
    for (i in Devices.deviceIP.indices) {
      if (Devices.switch[i]) {
        Toast.makeText(applicationContext, Devices.deviceIP[i], Toast.LENGTH_SHORT).show()
        //tv_color_rgb.text = "RGB: $r, $g, $b, \nHex: $hex\n${Devices.deviceIP[0]}"

      //Toast.makeText(this@RGBActivity, Devices.deviceIP[i], Toast.LENGTH_SHORT).show()




If `wv_rgb' is a WebView than for a loadUrl you have to wait for event onPageFinished() (or onPageLoaded() forgot name).

Open Multiple URLs, Opens a list of URLs. because URLs of tabs are accessible, although this access is only used to set the URL of tabs opened by the extension. There is a check box "don't load tabs until selected". In the same way add one more check box with option "load tabs 3 at a time when 1st one is selected. That means if I open the first tab 3 more

inside the loop you can try using onPageStarted() passing view url anf favicon and than call onPageFinished()(as stated by @blackapps) passing view and url. or try using conventional for loop(not sure, but worth a shot).

also you can look into this link

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Thanks for your answers they've helped me a lot but for me i could not wait for the webView to finish loading beacause this would be to slow to control multiple ESP8266 Modules.

I've used an array of webViews to load the urls in a short time period.

colorPickerView.setColorListener(ColorListener { color, _ ->
    brightness = seekBar.progress

    r = (*brightness)/255
    g = (*brightness)/255
    b = (*brightness)/255

    val hex = "#" + Integer.toHexString(color)

    for (i in Devices.deviceIP.indices) {
        if (Devices.switch[i]) {
            url = "http://${Devices.deviceIP[i]}/?r${r}g${g}b${b}&"
            wvRGB[i].settings.javaScriptEnabled = true
            //Toast.makeText(this@RGBActivity, "${Devices.deviceIP[i]}", Toast.LENGTH_SHORT).show()


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  • What is wv_rgb?
  • Yes wv_rgb is a WebView
  • and than call onPageFinished()(as stated by ... One can not call onPageFinished(). It's an event. One can override it and place code in it which is executed ... when the page is finished.