I am working on an Android application that could recognize if the device is connected to a Network. If not, application display an AlertDialog
and give the chance to the user to go to the device settings and open the wifi.
I have create a BroadcastReceiver
for this job but i dont know how i can create an AlertDialog
and give the option to the user to enable the the wifi.
Here is the code of BroadcastReceiver
.
public class ExampleBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, Intent intent) {
if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {
boolean noConnectivity = intent.getBooleanExtra(
ConnectivityManager.EXTRA_NO_CONNECTIVITY, false
);
if (noConnectivity) {
AlertDialog.Builder builder1 = new AlertDialog.Builder(context);
builder1.setMessage("You must have internet connection");
builder1.setCancelable(true);
builder1.setPositiveButton(
"Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
builder1.setNegativeButton(
"No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
builder1.create();
builder1.show();
} else {
Toast.makeText(context, "Connected", Toast.LENGTH_SHORT).show();
}
}
}
}
Please note, the below code is just for your reference. You could update/change this code based on your requirement.
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getSimpleName();
private BroadcastReceiver mNetworkReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
registerNetworkBroadcastForNougat();
}
private void registerNetworkBroadcastForNougat() {
mNetworkReceiver = new NetworkChangeReceiver();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
registerReceiver(mNetworkReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
registerReceiver(mNetworkReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
}
}
protected void unregisterNetworkChanges() {
try {
unregisterReceiver(mNetworkReceiver);
} catch (IllegalArgumentException e) {
e.printStackTrace();
}
}
@Override
public void onDestroy() {
super.onDestroy();
unregisterNetworkChanges();
}
class NetworkChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent)
{
try
{
if (!isOnline(context)) {
showDialog(context);
}
} catch (NullPointerException e) {
e.printStackTrace();
}
}
private void showDialog(final Context context) {
AlertDialog.Builder builder1 = new AlertDialog.Builder(context);
builder1.setMessage("You must have internet connection");
builder1.setCancelable(true);
builder1.setPositiveButton(
"Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
startActivity(new Intent(WifiManager.ACTION_PICK_WIFI_NETWORK));
}
});
builder1.setNegativeButton(
"No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
builder1.create();
builder1.show();
}
private boolean isOnline(Context context) {
try {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
//should check null because in airplane mode it will be null
return (netInfo != null && netInfo.isConnected());
} catch (NullPointerException e) {
e.printStackTrace();
return false;
}
}
}
}