Android - Show a message if no internet connection and continue to check

Question

I've been working on this for a couple of days now. I just started working with Android. I have a 2 part question. i want to check if internet is available. If it is launch the webView if not give an alert and prevent webView from loading. I have tried this but it force closes if there is not internet connection(e.g. airplane mode). How do I get it to give a message and stop loading the webview. Also is there a way to continuously check for connection so that the webpage 404 is not shown when it loses connection? Here is my code. ``` public class MainActivity extends Activity { private WebView webView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); android.net.NetworkInfo wifi = cm .getNetworkInfo(ConnectivityManager.TYPE_WIFI); android.net.NetworkInfo datac = cm .getNetworkInfo(ConnectivityManager.TYPE_MOBILE); if ((wifi != null & datac !=…

Accepted Answer

To check Network connection availability use the below ``` public class CheckNetwork { private static final String TAG = CheckNetwork.class.getSimpleName(); public static boolean isInternetAvailable(Context context) { NetworkInfo info = (NetworkInfo) ((ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo(); if (info == null) { Log.d(TAG,"no internet connection"); return false; } else { if(info.isConnected()) { Log.d(TAG," internet connection available..."); return true; } else { Log.d(TAG," internet connection"); return true; } } } } ``` In your Activity ``` if(CheckNetwork.isInternetAvailable(Activity.this)) //returns true if internet available { //do something. loadwebview. } else { Toast.makeText(Activity.this,"No Internet Connection",1000).show(); } ``` On back button press ``` @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(event.getAction() == KeyEvent.ACTION_DOWN){ switch(keyCode) { case KeyEvent.KEYCODE_BACK: if(mWebView.canGoBack() == true){ mWebView.goBack(); }else{ finish(); } return true; } } return super.onKeyDown(keyCode, event); } ``` Update : if you need to check network connection availability at all times, System broadcasts events when there is connectivity change or loss of connectivity. You can capture those broadcasts in your activity by registering for the broadcast. But you need to unregister when not required. An example is at the below Link. Android service to check internet connectivity?. Or you can use a service that checks internet connectivity in the background. But you need to destroy the service when not required. But service is used for running long running operations in background Update 2: Try the below. I have tested. It works on my Samsung Galaxy S3. Add these permissions in manifest ```

``` Your activity_main.xml ``` ``` Your activity ``` public class MainActivity extends Activity { private WebView webView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); webView = (WebView) findViewById(R.id.wv); if(CheckNetwork.isInternetAvailable(MainActivity.this)) { CookieManager cookieManager = CookieManager.getInstance(); cookieManager.setAcceptCookie(true); // webView = (WebView) findViewById(R.id.wv); // webView.setWebViewClient(new MyWebViewClient()); webView.getSettings().setJavaScriptEnabled(true); webView.setWebChromeClient(new WebChromeClient() { public void onProgressChanged(WebView view, int progress) { // Activities and WebViews measure progress with different scales. // The progress meter will automatically disappear when we reach 100% MainActivity.this.setProgress(progress * 1000); } }); webView.setWebViewClient(new WebViewClient() { public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) { Toast.makeText(MainActivity.this, "Oh no! " + description, Toast.LENGTH_SHORT).show(); } }); webView.loadUrl("http://slashdot.org/"); } else{ //no connection Toast toast = Toast.makeText(MainActivity.this, "No Internet Connection", Toast.LENGTH_LONG); toast.show(); } } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { webView.goBack(); return true; } else { finish(); } return super.onKeyDown(keyCode, event); } } ```

Android - Show a message if no internet connection and continue to check

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