Android WebView doesn't load url after returning to WebView page/activity










1















Depending on WiFi connection (whether it's "on" or "off"), I want to display one of the two views/activities: No Connection or WebView with URL. I'm using BroadcastReceiver to check the connection.



Everything seems to work fine when the app loads, but when I toggle WiFi "off" and then "on" again (whenever I leave WebView and then come back), WebView URL doesn't load (get Webpage not available message). No Connection view works always, so I'm assuming there is something with WebView. And also, WebView works if I add 5 second delay and then do loadUrl again. I can also see that WiFi status is detected properly.



I would appreciate any input. I've googled it, but all I can find is basic WebView examples. I'm very new to Android, so maybe I'm missing something basic. Thanks in advance for your help!



```
class WebViewActivity : AppCompatActivity()



private lateinit var wifiManager : WifiManager
private lateinit var intentMain: Intent
private lateinit var webView: WebView

override fun onCreate(savedInstanceState: Bundle?)
Log.d("WIFI_TEST", "WV: onCreate")
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_web_view)

wifiManager = applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
intentMain = Intent(this, MainActivity::class.java)
webView = findViewById(R.id.webview)

webView.settings.javaScriptEnabled = true
webview.settings.domStorageEnabled = true
webView.webViewClient = WebViewClient()
webView.loadUrl("https://google.com")


override fun onStart()
super.onStart()
val intentFilter = IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION)
registerReceiver(wifiStateReceiver, intentFilter)


override fun onStop()
super.onStop()
webView.destroy()
unregisterReceiver(wifiStateReceiver)


override fun onBackPressed()
if (webView.canGoBack())
webView.goBack()
else
super.onBackPressed()



private val wifiStateReceiver = object : BroadcastReceiver()
override fun onReceive(context: Context, intent: Intent)
val wifiStateExtra = intent.getIntExtra(
WifiManager.EXTRA_WIFI_STATE,
WifiManager.WIFI_STATE_UNKNOWN
)

when (wifiStateExtra)
WifiManager.WIFI_STATE_DISABLED ->
Log.d("WIFI_TEST", "WV: OFF")
startActivity(intentMain)

WifiManager.WIFI_STATE_ENABLED ->
Log.d("WIFI_TEST", "WV: ON")
// Works with delay with at least 5 sec
// Why?
Timer().schedule(5000)
Log.d("WIFI_TEST", "WV: delay")
webView.post(Runnable
webView.loadUrl("https://google.com")
)








```










share|improve this question


























    1















    Depending on WiFi connection (whether it's "on" or "off"), I want to display one of the two views/activities: No Connection or WebView with URL. I'm using BroadcastReceiver to check the connection.



    Everything seems to work fine when the app loads, but when I toggle WiFi "off" and then "on" again (whenever I leave WebView and then come back), WebView URL doesn't load (get Webpage not available message). No Connection view works always, so I'm assuming there is something with WebView. And also, WebView works if I add 5 second delay and then do loadUrl again. I can also see that WiFi status is detected properly.



    I would appreciate any input. I've googled it, but all I can find is basic WebView examples. I'm very new to Android, so maybe I'm missing something basic. Thanks in advance for your help!



    ```
    class WebViewActivity : AppCompatActivity()



    private lateinit var wifiManager : WifiManager
    private lateinit var intentMain: Intent
    private lateinit var webView: WebView

    override fun onCreate(savedInstanceState: Bundle?)
    Log.d("WIFI_TEST", "WV: onCreate")
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_web_view)

    wifiManager = applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
    intentMain = Intent(this, MainActivity::class.java)
    webView = findViewById(R.id.webview)

    webView.settings.javaScriptEnabled = true
    webview.settings.domStorageEnabled = true
    webView.webViewClient = WebViewClient()
    webView.loadUrl("https://google.com")


    override fun onStart()
    super.onStart()
    val intentFilter = IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION)
    registerReceiver(wifiStateReceiver, intentFilter)


    override fun onStop()
    super.onStop()
    webView.destroy()
    unregisterReceiver(wifiStateReceiver)


    override fun onBackPressed()
    if (webView.canGoBack())
    webView.goBack()
    else
    super.onBackPressed()



    private val wifiStateReceiver = object : BroadcastReceiver()
    override fun onReceive(context: Context, intent: Intent)
    val wifiStateExtra = intent.getIntExtra(
    WifiManager.EXTRA_WIFI_STATE,
    WifiManager.WIFI_STATE_UNKNOWN
    )

    when (wifiStateExtra)
    WifiManager.WIFI_STATE_DISABLED ->
    Log.d("WIFI_TEST", "WV: OFF")
    startActivity(intentMain)

    WifiManager.WIFI_STATE_ENABLED ->
    Log.d("WIFI_TEST", "WV: ON")
    // Works with delay with at least 5 sec
    // Why?
    Timer().schedule(5000)
    Log.d("WIFI_TEST", "WV: delay")
    webView.post(Runnable
    webView.loadUrl("https://google.com")
    )








    ```










    share|improve this question
























      1












      1








      1








      Depending on WiFi connection (whether it's "on" or "off"), I want to display one of the two views/activities: No Connection or WebView with URL. I'm using BroadcastReceiver to check the connection.



      Everything seems to work fine when the app loads, but when I toggle WiFi "off" and then "on" again (whenever I leave WebView and then come back), WebView URL doesn't load (get Webpage not available message). No Connection view works always, so I'm assuming there is something with WebView. And also, WebView works if I add 5 second delay and then do loadUrl again. I can also see that WiFi status is detected properly.



      I would appreciate any input. I've googled it, but all I can find is basic WebView examples. I'm very new to Android, so maybe I'm missing something basic. Thanks in advance for your help!



      ```
      class WebViewActivity : AppCompatActivity()



      private lateinit var wifiManager : WifiManager
      private lateinit var intentMain: Intent
      private lateinit var webView: WebView

      override fun onCreate(savedInstanceState: Bundle?)
      Log.d("WIFI_TEST", "WV: onCreate")
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_web_view)

      wifiManager = applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
      intentMain = Intent(this, MainActivity::class.java)
      webView = findViewById(R.id.webview)

      webView.settings.javaScriptEnabled = true
      webview.settings.domStorageEnabled = true
      webView.webViewClient = WebViewClient()
      webView.loadUrl("https://google.com")


      override fun onStart()
      super.onStart()
      val intentFilter = IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION)
      registerReceiver(wifiStateReceiver, intentFilter)


      override fun onStop()
      super.onStop()
      webView.destroy()
      unregisterReceiver(wifiStateReceiver)


      override fun onBackPressed()
      if (webView.canGoBack())
      webView.goBack()
      else
      super.onBackPressed()



      private val wifiStateReceiver = object : BroadcastReceiver()
      override fun onReceive(context: Context, intent: Intent)
      val wifiStateExtra = intent.getIntExtra(
      WifiManager.EXTRA_WIFI_STATE,
      WifiManager.WIFI_STATE_UNKNOWN
      )

      when (wifiStateExtra)
      WifiManager.WIFI_STATE_DISABLED ->
      Log.d("WIFI_TEST", "WV: OFF")
      startActivity(intentMain)

      WifiManager.WIFI_STATE_ENABLED ->
      Log.d("WIFI_TEST", "WV: ON")
      // Works with delay with at least 5 sec
      // Why?
      Timer().schedule(5000)
      Log.d("WIFI_TEST", "WV: delay")
      webView.post(Runnable
      webView.loadUrl("https://google.com")
      )








      ```










      share|improve this question














      Depending on WiFi connection (whether it's "on" or "off"), I want to display one of the two views/activities: No Connection or WebView with URL. I'm using BroadcastReceiver to check the connection.



      Everything seems to work fine when the app loads, but when I toggle WiFi "off" and then "on" again (whenever I leave WebView and then come back), WebView URL doesn't load (get Webpage not available message). No Connection view works always, so I'm assuming there is something with WebView. And also, WebView works if I add 5 second delay and then do loadUrl again. I can also see that WiFi status is detected properly.



      I would appreciate any input. I've googled it, but all I can find is basic WebView examples. I'm very new to Android, so maybe I'm missing something basic. Thanks in advance for your help!



      ```
      class WebViewActivity : AppCompatActivity()



      private lateinit var wifiManager : WifiManager
      private lateinit var intentMain: Intent
      private lateinit var webView: WebView

      override fun onCreate(savedInstanceState: Bundle?)
      Log.d("WIFI_TEST", "WV: onCreate")
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_web_view)

      wifiManager = applicationContext.getSystemService(Context.WIFI_SERVICE) as WifiManager
      intentMain = Intent(this, MainActivity::class.java)
      webView = findViewById(R.id.webview)

      webView.settings.javaScriptEnabled = true
      webview.settings.domStorageEnabled = true
      webView.webViewClient = WebViewClient()
      webView.loadUrl("https://google.com")


      override fun onStart()
      super.onStart()
      val intentFilter = IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION)
      registerReceiver(wifiStateReceiver, intentFilter)


      override fun onStop()
      super.onStop()
      webView.destroy()
      unregisterReceiver(wifiStateReceiver)


      override fun onBackPressed()
      if (webView.canGoBack())
      webView.goBack()
      else
      super.onBackPressed()



      private val wifiStateReceiver = object : BroadcastReceiver()
      override fun onReceive(context: Context, intent: Intent)
      val wifiStateExtra = intent.getIntExtra(
      WifiManager.EXTRA_WIFI_STATE,
      WifiManager.WIFI_STATE_UNKNOWN
      )

      when (wifiStateExtra)
      WifiManager.WIFI_STATE_DISABLED ->
      Log.d("WIFI_TEST", "WV: OFF")
      startActivity(intentMain)

      WifiManager.WIFI_STATE_ENABLED ->
      Log.d("WIFI_TEST", "WV: ON")
      // Works with delay with at least 5 sec
      // Why?
      Timer().schedule(5000)
      Log.d("WIFI_TEST", "WV: delay")
      webView.post(Runnable
      webView.loadUrl("https://google.com")
      )








      ```







      android kotlin android-webview






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 15 '18 at 22:40









      quietbitsquietbits

      14319




      14319






















          1 Answer
          1






          active

          oldest

          votes


















          0














          Remember that when the Wifi is enabled again probably is available but you have to wait some milliseconds for connectivity.



           WifiManager.WIFI_STATE_ENABLED -> 
          Log.d("WIFI_TEST", "WV: ON")
          // Works with delay with at least 5 sec
          // Why?
          Timer().schedule(5000)
          Log.d("WIFI_TEST", "WV: delay")
          webView.post(Runnable
          webView.loadUrl("https://google.com")
          )





          isAvailable(): Indicates whether network connectivity is possible. A
          network is unavailable when a persistent or semi-persistent condition
          prevents the possibility of connecting to that network.



          isConnected(): Indicates whether network connectivity exists and it is
          possible to establish connections and pass data.







          share|improve this answer























          • Thanks for your quick response! I see what you mean, will try and update with progress.

            – quietbits
            Nov 16 '18 at 15:01










          Your Answer






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          active

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          0














          Remember that when the Wifi is enabled again probably is available but you have to wait some milliseconds for connectivity.



           WifiManager.WIFI_STATE_ENABLED -> 
          Log.d("WIFI_TEST", "WV: ON")
          // Works with delay with at least 5 sec
          // Why?
          Timer().schedule(5000)
          Log.d("WIFI_TEST", "WV: delay")
          webView.post(Runnable
          webView.loadUrl("https://google.com")
          )





          isAvailable(): Indicates whether network connectivity is possible. A
          network is unavailable when a persistent or semi-persistent condition
          prevents the possibility of connecting to that network.



          isConnected(): Indicates whether network connectivity exists and it is
          possible to establish connections and pass data.







          share|improve this answer























          • Thanks for your quick response! I see what you mean, will try and update with progress.

            – quietbits
            Nov 16 '18 at 15:01















          0














          Remember that when the Wifi is enabled again probably is available but you have to wait some milliseconds for connectivity.



           WifiManager.WIFI_STATE_ENABLED -> 
          Log.d("WIFI_TEST", "WV: ON")
          // Works with delay with at least 5 sec
          // Why?
          Timer().schedule(5000)
          Log.d("WIFI_TEST", "WV: delay")
          webView.post(Runnable
          webView.loadUrl("https://google.com")
          )





          isAvailable(): Indicates whether network connectivity is possible. A
          network is unavailable when a persistent or semi-persistent condition
          prevents the possibility of connecting to that network.



          isConnected(): Indicates whether network connectivity exists and it is
          possible to establish connections and pass data.







          share|improve this answer























          • Thanks for your quick response! I see what you mean, will try and update with progress.

            – quietbits
            Nov 16 '18 at 15:01













          0












          0








          0







          Remember that when the Wifi is enabled again probably is available but you have to wait some milliseconds for connectivity.



           WifiManager.WIFI_STATE_ENABLED -> 
          Log.d("WIFI_TEST", "WV: ON")
          // Works with delay with at least 5 sec
          // Why?
          Timer().schedule(5000)
          Log.d("WIFI_TEST", "WV: delay")
          webView.post(Runnable
          webView.loadUrl("https://google.com")
          )





          isAvailable(): Indicates whether network connectivity is possible. A
          network is unavailable when a persistent or semi-persistent condition
          prevents the possibility of connecting to that network.



          isConnected(): Indicates whether network connectivity exists and it is
          possible to establish connections and pass data.







          share|improve this answer













          Remember that when the Wifi is enabled again probably is available but you have to wait some milliseconds for connectivity.



           WifiManager.WIFI_STATE_ENABLED -> 
          Log.d("WIFI_TEST", "WV: ON")
          // Works with delay with at least 5 sec
          // Why?
          Timer().schedule(5000)
          Log.d("WIFI_TEST", "WV: delay")
          webView.post(Runnable
          webView.loadUrl("https://google.com")
          )





          isAvailable(): Indicates whether network connectivity is possible. A
          network is unavailable when a persistent or semi-persistent condition
          prevents the possibility of connecting to that network.



          isConnected(): Indicates whether network connectivity exists and it is
          possible to establish connections and pass data.








          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 16 '18 at 0:55









          ElenasysElenasys

          95k16248215




          95k16248215












          • Thanks for your quick response! I see what you mean, will try and update with progress.

            – quietbits
            Nov 16 '18 at 15:01

















          • Thanks for your quick response! I see what you mean, will try and update with progress.

            – quietbits
            Nov 16 '18 at 15:01
















          Thanks for your quick response! I see what you mean, will try and update with progress.

          – quietbits
          Nov 16 '18 at 15:01





          Thanks for your quick response! I see what you mean, will try and update with progress.

          – quietbits
          Nov 16 '18 at 15:01



















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