网络连接异常处理工具

public class NetStateUtils {
  
   
   /**
    * 对网络连接状态进行判断
    * 
    * @return true, 可用； false， 不可用
    */
   public static boolean isNetworkConnected(Context context) {
      if (context != null) {
         ConnectivityManager connManager = (ConnectivityManager) context
               .getSystemService(Context.CONNECTIVITY_SERVICE);
         NetworkInfo networkInfo = connManager.getActiveNetworkInfo();
         if (networkInfo != null) {
            return networkInfo.isAvailable();
         }
      }
      return false;
   }
   
   
   /**
    * 提示设置网络连接
    * 
    */
   public static void alertSetNetwork(final Context context) {
      AlertDialog.Builder builder = new AlertDialog.Builder(context);
      builder.setTitle(context.getResources().getString(R.string.neterror)).setMessage(context.getString(R.string.question));

      builder.setPositiveButton(context.getResources().getString(R.string.set), new DialogInterface.OnClickListener() {
         @Override
         public void onClick(DialogInterface dialog, int which) {
            Intent intent = null;
            try {
               int sdkVersion = android.os.Build.VERSION.SDK_INT;
               if (sdkVersion > 10) {
                  intent = new Intent(
                        android.provider.Settings.ACTION_WIRELESS_SETTINGS);
               } else {
                  intent = new Intent();
                  ComponentName comp = new ComponentName(
                        "com.android.settings",
                        "com.android.settings.WirelessSettings");
                  intent.setComponent(comp);
                  intent.setAction("android.intent.action.VIEW");
               }
               context.startActivity(intent);
            } catch (Exception e) {
               e.printStackTrace();
            }
         }
      });
      builder.setNegativeButton(context.getString(R.string.cancle), new DialogInterface.OnClickListener() {
         @Override
         public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
            System.exit(0);
            System.gc();
         }
      });
      builder.show();
   }
}