public class ProductSortPop {
  private Context mContext;
  private View.OnClickListener mOnClickListener; //創建一個點擊事件接口回調數據
  private TextView mAllSort;
  private TextView mNewSort;
  private TextView mCommentSort;
  private View mLeftV;
  private PopupWindow mPopupWindow;
  public ProductSortPop(View.OnClickListener onClickListener, Context context) {
    mOnClickListener = onClickListener;
    mContext = context;
    initView();
  }
  //加載布局
  private void initView() {
    View view = LayoutInflater.from(mContext).inflate(R.layout.product_sort_pop_layout, null);
    //找到控件
    mAllSort = (TextView) view.findViewById(R.id.all_sort);
    mNewSort = (TextView) view.findViewById(R.id.new_sort);
    mCommentSort = (TextView) view.findViewById(R.id.comment_sort);
    //設置點擊事件
    mAllSort.setOnClickListener(mOnClickListener);
    mNewSort.setOnClickListener(mOnClickListener);
    mCommentSort.setOnClickListener(mOnClickListener);
    view.findViewById(R.id.left_v).setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        onDismiss();
      }
    });
    mPopupWindow = new PopupWindow(view,
        LinearLayout.LayoutParams.MATCH_PARENT,
        LinearLayout.LayoutParams.MATCH_PARENT);
    //設置內部獲取焦點
    mPopupWindow.setFocusable(true);
    //設置外部獲取焦點
    mPopupWindow.setOutsideTouchable(true);
    mPopupWindow.setBackgroundDrawable(new ColorDrawable());
    //更新當前的狀態
    mPopupWindow.update();
  }
  //創建一個顯示的方法
  public void onShow(View v){
    if (!mPopupWindow.isShowing()){
      mPopupWindow.showAsDropDown(v,0,5);
    }
  }
  //創建一個隱藏的方法
  public void onDismiss(){
    if (mPopupWindow.isShowing()){
      mPopupWindow.dismiss();
    }
  }
}