我一直在尝试为ecommmerce应用的产品详情页面实现无限滚动功能。网格显示项目的详细信息，当我滚动到底部时，我需要显示进度条，然后附加新的项目网格。
api调用的工作原理如下，我需要发送一个start_row_number和limit，它会将start_row_number中的所有项目发送给我。示例：start_row_number = 0和limit = 10.这将返回0到10之间的项目
之后我需要在用户到达网格底部时加载更多项目，并将其附加到gridview。所以我将发送start_row_number = 10和limit = 10，这将返回10到20的项目。
截至目前，我可以获得0到10之间的项目，但之后不会。我如何创建无限滚动功能，并使一切不会给我带来错误，例如在主线程上做太多工作＆＃39;
这是我的MainActivity：
public class ProductListing extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.product_listing_act);
init();
}
public void productListingApiCall(ProductListingCondtionModel productListingCondtionModel) {
RestAdapter restAdapter = new RestAdapter.Builder().setEndpoint(productListingCondtionModel.getBase_url()).setLogLevel(RestAdapter.LogLevel.FULL).build();
final ProductListingApi productListingApi =
restAdapter.create(ProductListingApi.class);
productListingApi.getFeed(productListingCondtionModel.getFile(),
productListingCondtionModel.getOperation_condition(),
productListingCondtionModel.getSearch_string_condition(),
productListingCondtionModel.getMinprice_condition(),
productListingCondtionModel.getMaxprice_condition(),
productListingCondtionModel.getMincusratings_condition(),
productListingCondtionModel.getMaxcusratings_condition(),
productListingCondtionModel.getDiscount_condition(),
productListingCondtionModel.getCatids_condition(),
productListingCondtionModel.getBrands_condition(),
productListingCondtionModel.getAffids_condition(),
productListingCondtionModel.getStart_row_condition(),
productListingCondtionModel.getLimit(),
productListingCondtionModel.getOrderby_condition(),
productListingCondtionModel.getSortby_condition(), new Callback<ProductListingPojo>() {
@Override
public void success(ProductListingPojo productListingPojo, Response response) {
final ProductListingPojo product = productListingPojo;
new Thread(new Runnable() {
@Override
public void run() {
String[] t = Arrays.copyOf(product.getTitle(),
product.getTitle().length);
int[] p = Arrays.copyOf(product.getSellingprice(),
product.getSellingprice().length);
int[] m = Arrays.copyOf(product.getMrp(),
product.getMrp().length);
int[] d = Arrays.copyOf(product.getDiscountpercent(),
product.getDiscountpercent().length);
String[] i = Arrays.copyOf(product.getProductimageSmall1(),
product.getProductimageSmall1().length);
for(int j = 0; j < t.length; j++) {
CategoryAllApi categoryAllApi = new CategoryAllApi();
categoryAllApi.setTitle(t[j]);
categoryAllApi.setPrice(p[j]);
categoryAllApi.setMrp(m[j]);
categoryAllApi.setDiscount(d[j]);
categoryAllApi.setImage(i[j]);
arrayList.add(categoryAllApi);
}
}
}).run();
setAdapter();
}
@Override
public void failure(RetrofitError error) {
tv_title_header.setText(error.getMessage());
Log.e("error", error.getMessage());
}
});
}
void setAdapter() {
adapter = new ProductListingGridAdapter(this, arrayList);
gv_product_listing_act.setAdapter(adapter);
}
}
继承人：
public class ProductListingGridAdapter extends BaseAdapter {
public ProductListingGridAdapter(ProductListing productListing, ArrayList<CategoryAllApi> arrayList) {
this.arrayList= arrayList;
context = productListing;
inflater = ( LayoutInflater )context.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return arrayList.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
public class Holder
{
ImageView im_pic;
TextView tv_title, tv_price, tv_mrp, tv_discount;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
GridView grid = (GridView) parent;
DisplayMetrics metrics = context.getResources().getDisplayMetrics();
int width = metrics.widthPixels;
grid.setColumnWidth(width);
grid.setNumColumns(2);
int size = grid.getRequestedColumnWidth() / 2 ;
Double d = new Double(size * 2);
int h = d.intValue();
Holder holder = new Holder();
View rowView;
int index = grid.getFirstVisiblePosition();
View v = grid.getChildAt(0);
int top = (v == null) ? 0 : (v.getTop() - grid.getPaddingTop());
grid.setSelectionFromTop(index, top);
rowView = inflater.inflate(R.layout.product_listing_gv_items_lay, null);
rowView.setLayoutParams(new GridView.LayoutParams(size, h));
holder.im_pic = (ImageView) rowView.findViewById(R.id.im_product_listing_gv_items_lay_pic);
holder.tv_title = (TextView) rowView.findViewById(R.id.tv_product_listing_gv_items_lay_title);
holder.tv_price = (TextView) rowView.findViewById(R.id.tv_product_listing_gv_items_lay_price);
holder.tv_mrp = (TextView) rowView.findViewById(R.id.tv_product_listing_gv_items_lay_mrp);
holder.tv_discount = (TextView) rowView.findViewById(R.id.tv_product_listing_gv_items_lay_discount);
holder.tv_title.setTypeface(EasyFonts.robotoMedium(rowView.getContext()));
holder.tv_price.setTypeface(EasyFonts.robotoBlack(rowView.getContext()));
holder.tv_mrp.setTypeface(EasyFonts.robotoLight(rowView.getContext()));
holder.tv_mrp.setPaintFlags(holder.tv_mrp.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
holder.tv_discount.setTypeface(EasyFonts.robotoLight(rowView.getContext()));
categoryAllApi = arrayList.get(position);
Ion.with(holder.im_pic).load(categoryAllApi.getImage());
holder.tv_title.setText(categoryAllApi.getTitle());
holder.tv_price.setText("Rs. " + categoryAllApi.getPrice());
holder.tv_mrp.setText("Rs. " + categoryAllApi.getMrp());
holder.tv_discount.setText("" + categoryAllApi.getDiscount() + "%");
rowView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(context, ProductDetails.class);
Bundle bundle = new Bundle();
bundle.putString("operation", "");
bundle.putString("productkey", "");
intent.putExtras(bundle);
context.startActivity(intent);
}
});
return rowView;
}
}
继承了CategoryApiCall.java：
public class CategoryAllApi {
private String title, image;
private int price, mrp, discount;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
public int getMrp() {
return mrp;
}
public void setMrp(int mrp) {
this.mrp = mrp;
}
public int getDiscount() {
return discount;
}
public void setDiscount(int discount) {
this.discount = discount;
}
}
答案 0 :(得分：0)
我看到你使用过GridView。
Google已经推出了RecyclerView，克服了listview和Gridview的缺陷，这些漏洞充斥着ram并使app变得笨重。
将RecyclerView与GridLayoutManager一起使用。此外，在RecyclerView中研究无限滚动（这很容易实现）。
我强烈建议您使用此应用，因为我尝试了同样的结果，结果非常出色。应用程序更快，内存变轻，滚动效果很好。此外，还有许多功能，如recyclerView对象将提供。关于谷歌处理这些事情并提高应用程序质量的时间。
流程可能看起来像一项任务，但从长远来看，它会为您和应用用户提供很多帮助。