如何检查Android中每个处理的Internet连接？

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

use the ConnectivityManager class and Context.getSystemService(Context.CONNECTIVITY_SERVICE) method. More information: http://developer.android.com/reference/android/net/ConnectivityManager.html

Answer 2

// 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