如何在Gridview中检测点击位置的图像视图？

2 回答

• 1

  您可以实现自己的自定义OnClickListener，并且可以为gridview的每个项目的每个onclick关联id / tag / position .

  item.setOnclickListener(new GridItemClick(position));
  

  下面的自定义点击事件类：

  Class GridItemClick implements View.OnClickListener
  {
       int position;
       Public GridItemClick(int position)
       {
           this.position = position;
       }
       @Override
       public onClick(View v)
       { 
           // You can add logic here for each item clicked using position of each item you passed in constructor
       }
  
  }
  

  我在开始时遇到了同样的问题，为了解决这个问题，我为视图创建了自定义clickListener，如上所述 .

  回复于 2024-04-30T14:34:00+08:00
• 1

  这是因为重用膨胀视图的默认行为 . 采取临时arraylist存储点击位置并验证相同的arraylist是否包含在getView方法中的特定位置

  ArrayList<String> selectedPosition = new ArrayList<String>();
  

  现在按以下方式更新你的getView（）方法：

  @Override
          public View getView(int position, View convertView, ViewGroup parent) {
          View row = convertView;
          holder = null;
  
          Product productItem = (Product) productList.get(position);
  
          if (row == null) {
  
  
                  LayoutInflater inflater = ((Activity) context).getLayoutInflater();
                  row = inflater.inflate(R.layout.products_grid_item_layout, parent, false);
                  holder = new ViewHolder();
                  holder.productImage = (ImageView) row.findViewById(R.id.productImage);
                  holder.detailsIcon = (ImageView) row.findViewById(R.id.detailsIcon);
                  holder.productTitle = (TextView) row.findViewById(R.id.productTitle);
                  holder.productSubTitle = (TextView) row.findViewById(R.id.productSubTitle);
                  holder.productQuantity = (TextView) row.findViewById(R.id.productQuantity);
                  holder.priceDollar = (TextView) row.findViewById(R.id.priceDollar);
                  holder.priceCent = (TextView) row.findViewById(R.id.priceCent);
                  holder.productCount = (TextView) row.findViewById(R.id.productCount);
                  holder.productGridLayout = (RelativeLayout) row.findViewById(R.id.productGridLayout);
  
                  row.setTag(holder);
  
          } else {
              holder = (ViewHolder) row.getTag();
          }
  
  
  
          String price = productItem.getPrice().toString();
  
          String[] pricearray;
          pricearray =  price.split("\\.");
  
          holder.productTitle.setText(productItem.getTitle().toString());
          holder.productSubTitle.setText(productItem.getSubtitle().toString());
          holder.productQuantity.setText(productItem.getVolume().toString());
          holder.priceDollar.setText(pricearray[0]+".");
          holder.priceCent.setText(pricearray[1]);
  
  
          if(productItem.getInCart()) {
              holder.productCount.setVisibility(View.VISIBLE);
              holder.productCount.setText(productItem.getVolume());
          }
  
          Picasso.with(context)
                  .load(productItem.getImageUrl())
                  .placeholder(R.drawable.favourites)
                  .error(R.drawable.favourites)
                  .into(holder.productImage);
  
          urlSlug = productItem.getUrlSlug();
  
  
         //Added Change here...Check if arraylist contains selectedposition or not?
  
          if(selectedPosition.contains(String.valueOf(position)))
                shrinkImage(holder.productImage);
          else
             //Nothing
  
  
  
          holder.detailsIcon.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
  
                  final int position = currentGridView.getPositionForView(v);
                  Log.e("grid position", position+"");
  
                  Intent productDetailIntent = new Intent(context,ProductDetailActivity.class);
                  productDetailIntent.putExtra("url_slug", productList.get(position).getUrlSlug());
  
                  context.startActivity(productDetailIntent);
              }
  
          });
  
      holder.productGridLayout.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
  
              //final int position = currentGridView.getPositionForView(v);
              //Log.e("grid position", position+"");
  
              //shrinkImage();
  
  
             //Simply store and check selectedPosition
  
             if(selectedPosition.contains(String.valueOf(position)))
                 selectedPosition.remove(String.valueOf(position));
             else
                 selectedPosition.add(String.valueOf(position));
  
             //And then update adapter
             notifyDataSetChanged();
          }
  
      });
  
  
          return row;
      }
  

  更新您的shirnkImage方法并使用通过参数传递的持有者图像的引用 .

  public void shrinkImage(ImageView productImage){
          // first 0f, 1f mean scaling from X-axis to X-axis, meaning scaling from 0-100%
          // first 0f, 1f mean scaling from Y-axis to Y-axis, meaning scaling from 0-100%
          // The two 0.5f mean animation will start from 50% of X-axis & 50% of Y-axis, i.e. from center
  
  
          ScaleAnimation fade_in =  new ScaleAnimation(1f, 0f, 1f, 0f, Animation.RELATIVE_TO_SELF, 1f, Animation.RELATIVE_TO_SELF, 1f);
          fade_in.setDuration(1000);     // animation duration in milliseconds
          fade_in.setFillAfter(true);    // If fillAfter is true, the transformation that this animation performed will persist when it is finished.
          productImage.startAnimation(fade_in);
  
          Log.e("fade","fade out");
      }
  

  回复于 2024-04-30T14:34:00+08:00