Question

I want to show a custom dialog in a webview app when there is no connection to the Internet. How can I check the Internet connection and after that call a dialog?

Answer 1

You can use ConnectivityManager to check if there is an internet connection, and you can show a Toast AlertDialog message to the user.

See also: AlertDialog.Builder

Edit:
Here is an example of how to do this with a Toast message:

ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = cm.getActiveNetworkInfo();
if (info != null) {
    if (!info.isConnected()) {
        Toast.makeText(this, "Please check your wireless connection and try again.", Toast.LENGTH_SHORT).show();
    }
}
else {
    Toast.makeText(this, "Please check your wireless connection and try again.", Toast.LENGTH_SHORT).show();
}