Question

In my application, most of the processing in all Activity need to connect to Server to get data.
So, where should I check the Internet connection?
Is there any methods that can tell me when the connection is unavailable?
Finally, how to implement it? Is there any API for handle this case?

Answer 1

// just checks if network connectivity is available 
public boolean isNetworkConnected(Context context){
    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    if (cm.getActiveNetworkInfo() != null && cm.getActiveNetworkInfo().isAvailable() && cm.getActiveNetworkInfo().isConnected()) return true;
    return false;           
}//end method