public class ToastUtil {
 /* private Context context;
  public ToastUtil(Context context) {
  this.context=context;
  }*/
  private static Toast toast;
  public static void showToast(Context context,int code,String content)
  {
    //code=1时Toast显示的时间长，code=0时显示的时间短。
    if (toast==null)
    {
      if (code ==0)
      toast=Toast.makeText(context,content,Toast.LENGTH_SHORT);
      if (code==1)
        toast=Toast.makeText(context,content,Toast.LENGTH_LONG);
    }
    else
    {
      toast.setText(content);
    }
    toast.show();
  }
}