CODEWITHSUNDEEP
androidkotlinandroid-webviewandroid-connectivitymanager
Zeni
Zeni

Reputation: 995

Android:Listen to Internet connectivity change and load URL in webView On connected

I am very new to android development so sorry in advance for very basic question.

At start of my app I want to check if network is available and connected, If yes then load webView and load URL. This was an easy part and I did it.

Now if at start of app not network is available I want user to connect to internet by click of button (also done) and once connected, setContentView to webView and load URL (big puzzle).

I found the below code here , but I don't know how to use it or where to put it. 

val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
connectivityManager?.let {
    it.registerDefaultNetworkCallback(object : ConnectivityManager.NetworkCallback() {
        override fun onAvailable(network: Network) {
            //take action when network connection is gained
        }
        override fun onLost(network: Network?) {
            //take action when network connection is lost
        }
    })
}

My code is as below:

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    if (supportActionBar != null)
        supportActionBar?.hide()
    val myWebView = WebView(this)
    myWebView.settings.setDomStorageEnabled(true)
    myWebView.settings.setJavaScriptCanOpenWindowsAutomatically(true)
    myWebView.settings.setDatabaseEnabled(true)
    myWebView.settings.javaScriptEnabled = true
    myWebView.webViewClient = WebViewClient()
    myWebView.addJavascriptInterface(WebAppInterface(this), "Android")



    val cm = getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    val activeNetwork: NetworkInfo? = cm.activeNetworkInfo
    val dialogBuilder = AlertDialog.Builder(this)


    if (activeNetwork!=null)
    {
        if (activeNetwork.isConnected) {
            // Toast.makeText(getApplicationContext(), "internet avialable", Toast.LENGTH_LONG).show();
            setContentView(myWebView)
            myWebView.loadUrl("https://xxxxxxx.com/xxx/xxx.html");


        }
    }else {
        setContentView(R.layout.activity_main)
        Toast.makeText(getApplicationContext(), "internet is not avialable", Toast.LENGTH_LONG).show();
        val alert = dialogBuilder.create()
        // set title for alert dialog box
        alert.setTitle("internet Not avialable")
        // show alert dialog
        alert.show()
        }
    }

    fun EnableWiFi(){

    val wifimanager=getApplicationContext().getSystemService(Context.WIFI_SERVICE) as WifiManager
    wifimanager.setWifiEnabled(true)
   }

Upvotes: 2

Views: 974

Answers (2)

Shahnawaz Ansari
Shahnawaz Ansari

Reputation: 370

Add A broadcast receiver for network changes class NetworkChangeReceiver : BroadcastReceiver() {

    override fun onReceive(context: Context, intent: Intent) {
        //Check if connected
        context.sendBroadcast(new Intent("INTERNET_CONNECTED"));
    }
}

Register the receiver in manifest as follows

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<receiver
        android:name="NetworkChangeReceiver"
        android:label="NetworkChangeReceiver" >
        <intent-filter>
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
            <action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
        </intent-filter>
</receiver>

Now in your activity create a broadcast receiver to receive the result for internet change

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    registerReceiver(broadcastReceiver, new IntentFilter("INTERNET_CONNECTED"));
}

val broadcastReceiver = object : BroadcastReceiver(){
    override fun onReceive(context: Context?, intent: Intent?) {
        //do your webview code here
    }
}

override fun onDestroy() {
    super.onDestroy()
    unregisterReceiver(broadcastReceiver);
}

Upvotes: 1

Abdul Waheed
Abdul Waheed

Reputation: 4678

You are supposed to put below code in your onCreate() method. By this you will be able to register your call back for listening to Internet connectivity changes

val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
connectivityManager?.let {
it.registerDefaultNetworkCallback(object : ConnectivityManager.NetworkCallback() {
    override fun onAvailable(network: Network) {
        //take action when network connection is gained
    }
    override fun onLost(network: Network?) {
        //take action when network connection is lost
    }
})

}

Hope this helps you.

Upvotes: 1

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