我在这里有GridViewAdapter的getView方法。
我想要的是，每当我点击gridview中的项目时，我点击的位置的图像应缩小，以便将其添加到购物车中。
但是，不是缩小点击位置的图像，而是收缩单元格的另一个图像（滚动视图时从Viewholder创建的最后一个图像）。任何帮助是极大的赞赏。感谢!!!
@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();
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();
}
});
return row;
}
public void shrinkImage(){
// 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.
holder.productImage.startAnimation(fade_in);
Log.e("fade","fade out");
}
答案 0 :(得分：1)
由于重用膨胀视图的默认行为而发生这种情况。采取临时arraylist来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>();
现在按照以下内容更新你的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;
}
更新你的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");
}
答案 1 :(得分：1)
您可以实现自己的自定义OnClickListener，并且可以为每个gridview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。