android检测当前网络是否可用

package cn.chen.util;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class NetworkDetector {
/**
* detect the current network
*
* @param context
* @return
*/
public static boolean detect(Context context) {

ConnectivityManager manager = (ConnectivityManager) context
.getApplicationContext().getSystemService(
Context.CONNECTIVITY_SERVICE);

if (manager == null) {
return false;
}

NetworkInfo networkinfo = manager.getActiveNetworkInfo();

if (networkinfo == null || !networkinfo.isAvailable()) {
return false;
}

return true;
}

}