// 参数分别是父容器，提示信息，持续时间public static Snackbar make(@NonNull View view, @NonNull CharSequence text,@Duration int duration) 

// 用于给SnackBar设定一个Action，点击之后会回调OnclickListener中的Onclick方法public Snackbar setAction(CharSequence text, final View.OnClickListener listener) 
// 用于设定Action的字体颜色public Snackbar setActionTextColor(@ColorInt int color) 
// 设定提示的字体public Snackbar setText(@NonNull CharSequence message) 
// 展示SnackBarpublic void show() 
// 清除SnackBarpublic void dismiss() 
// 设置回调，比如OnDismissed或者OnShownpublic Snackbar setCallback(Callback callback) 

delete.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    backupMap = mdata.get(position);
    mdata.remove(position);
    notifyDataSetChanged();
    Snackbar snackBar = Snackbar.make(root, "是否撤销删除？", Snackbar.LENGTH_LONG);
    snackBar.setAction("YES", new MyOnClickListener(position));
    snackBar.setCallback(new MyCallback());
    snackBar.show();
   }
  });

private class MyOnClickListener implements View.OnClickListener {
  private final int position;

  public MyOnClickListener(int position) {
   this.position = position;
  }

  @Override
  public void onClick(View v) {
   mdata.add(position, backupMap);
   notifyDataSetChanged();
  }
 }

private class MyCallback extends Snackbar.Callback {
  @Override
  public void onDismissed(Snackbar snackbar, int event) {
   super.onDismissed(snackbar, event);
   if (event == DISMISS_EVENT_SWIPE || event == DISMISS_EVENT_TIMEOUT || event ==
     DISMISS_EVENT_CONSECUTIVE) {
    mdatabase.execSQL("delete from tally where id=?", new String[]{backupMap.get
      ("id").toString()});
   }
  }
 }

/** Indicates that the Snackbar was dismissed via a swipe.*/
public static final int DISMISS_EVENT_SWIPE = 0;
/** Indicates that the Snackbar was dismissed via an action click.*/
public static final int DISMISS_EVENT_ACTION = 1;
/** Indicates that the Snackbar was dismissed via a timeout.*/
public static final int DISMISS_EVENT_TIMEOUT = 2;
/** Indicates that the Snackbar was dismissed via a call to {@link #dismiss()}.*/
public static final int DISMISS_EVENT_MANUAL = 3;
/** Indicates that the Snackbar was dismissed from a new Snackbar being shown.*/
public static final int DISMISS_EVENT_CONSECUTIVE = 4;