检查android客户端网络是否可用

/**

*检查网络是否可用

*

*/

public class CheckNetWorkUtil  {

 
 public static boolean checkNetWork(Context context){
  //判断网络是否可用，如果不可用，给出提示
        boolean isAvailable = netWorkIsAvailable(context);
        if(!isAvailable){//如果不可用
         openDialog(context);
         return false;
        }
        return true;
 }
 
 public static boolean netWorkIsAvailable(Context context) {
  ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService( Context.CONNECTIVITY_SERVICE );
  NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
  if(activeNetInfo!=null){
   if(activeNetInfo.isAvailable()){
    return true;
   }else{
    return false;
   }
  }
  return false;
 }
 
 private static void openDialog(final Context context) {
  final Builder builder=new AlertDialog.Builder(context);
  builder.setTitle("没有可用的网络");
        builder.setMessage("请开启GPRS或WIFI网络连接");
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {
                Intent mIntent = new Intent("/");
                   ComponentName comp = new ComponentName("com.android.settings", "com.android.settings.WirelessSettings");
                   mIntent.setComponent(comp);
                   mIntent.setAction("android.intent.action.VIEW");
                   context.startActivity(mIntent);

 }
        }).setNeutralButton("取消", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {
                dialog.cancel();
            }
        }).create().show();

}
}