Daily#2. Handling Network Connectivity Issues in Android Apps

 When developing an Android app, it's important to ensure your app can handle network connectivity issues, especially when switching between Wi-Fi and mobile data. Android provides APIs to monitor network connectivity and report issues to help you manage your app's behavior in different network situations.

1. Register a `ConnectivityManager.NetworkCallback` to monitor network changes:

   private ConnectivityManager connectivityManager;
   private ConnectivityManager.NetworkCallback networkCallback;
   
   private void registerNetworkCallback(Context context) {
       connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
       networkCallback = new ConnectivityManager.NetworkCallback() {
           @Override
           public void onAvailable(Network network) {
               // Handle network connection established
           }
   
           @Override
           public void onCapabilitiesChanged(@NonNull Network network, @NonNull NetworkCapabilities nc) {
               // onCapabilitiesChanged
               boolean valid = nc.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED);
           }
   
           @Override
           public void onLost(Network network) {
               // Handle network connection lost
           }
       };
   
       NetworkRequest.Builder builder = new NetworkRequest.Builder();
       connectivityManager.registerNetworkCallback(builder.build(), networkCallback);
   }     

2. Don't forget to unregister the `NetworkCallback` when it's no longer needed, such as in your Activity's `onDestroy()` method:

   @Override
   protected void onDestroy() {
       super.onDestroy();
       if (connectivityManager != null && networkCallback != null) {
           connectivityManager.unregisterNetworkCallback(networkCallback);
       }
   }

3. Report network connectivity problems using ConnectivityManager.reportNetworkConnectivity():

   private void reportNetworkConnectivity(Context context, boolean hasProblem) {
       Network activeNetwork = connectivityManager.getActiveNetwork();
       if (activeNetwork != null) {
           connectivityManager.reportNetworkConnectivity(activeNetwork, hasProblem);
       }
   }   

With these code snippets, your app can monitor and respond to network connectivity changes and provide a better user experience by handling Wi-Fi and mobile data transitions more gracefully. Remember to request the ACCESS_NETWORK_STATE permission in your AndroidManifest.xml file to use the ConnectivityManager APIs:

  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />