Koltin25.Takeout首页填充其他的数据(11)

原创于 2020-10-22 02:29:02 发布 · 144 阅读

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本文展示了如何在Android应用中使用Picasso库加载网络图片，并将其显示在RecyclerView的不同ViewHolder中。HomeRvAdapter类包含了处理标题和商家信息的方法，包括设置图片路径、加载图片、显示评分等。同时，还介绍了Servlet配置以处理图片请求。

图片的路径===http://127.0.0.1:8090/image?name=takeout/imgs/seller/3.jpg

HomeRvAdapter.kt加载图片的方法，其中服务端的url是“takeout/imgs/seller/3.jpg”通过拼接“http://127.0.0.1:8090/image?name=”的方法来请求图片

package com.example.takeout.ui.adapter

import android.content.Context
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.RatingBar
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.daimajia.slider.library.SliderLayout
import com.daimajia.slider.library.SliderTypes.TextSliderView
import com.example.takeout.R
import com.heima.takeout.model.beans.Seller
import com.squareup.picasso.Picasso
import org.jetbrains.anko.find

class HomeRvAdapter(val context: Context) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {

    //定义常量
    companion object {
        val TYPE_TITLE = 0
        val TYPE_SELLER = 1
    }

    val host = "http://127.0.0.1:8090/image?name="

    var mDatas: ArrayList<Seller> = ArrayList()

    fun setData(data: ArrayList<Seller>) {
        this.mDatas = data
        notifyDataSetChanged()
    }

    /**
     * 不同position对应不同类型
     */
    override fun getItemViewType(position: Int): Int {
        if (position == 0) {
            return TYPE_TITLE
        } else {
            return TYPE_SELLER
        }
    }

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        val viewType = getItemViewType(position)
        when (viewType) {
            TYPE_TITLE -> (holder as TitleHolder).bindData("我是title----------------------------------------")
            TYPE_SELLER -> (holder as SellerHolder).bindData(mDatas[position - 1])
        }

    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        when (viewType) {
            TYPE_TITLE -> return TitleHolder(View.inflate(context, R.layout.item_title, null))
            TYPE_SELLER -> return SellerHolder(View.inflate(context, R.layout.item_seller, null))
            else -> return TitleHolder(View.inflate(context, R.layout.item_home_common, null))
        }
    }

    override fun getItemCount(): Int {
        if (mDatas.size > 0) {
            return mDatas.size + 1
        } else {
            return 0
        }
    }

    //内部类，商家的holder
    inner class SellerHolder(item: View) : RecyclerView.ViewHolder(item) {
        val tvTitle: TextView
        val ivLogo: ImageView
        val rbScore: RatingBar
        val tvSale: TextView
        val tvSendPrice: TextView

        init {
            tvTitle = item.find(R.id.tv_title)
            ivLogo = item.find(R.id.seller_logo)
            rbScore = item.find(R.id.ratingBar)
            tvSale = item.find(R.id.tv_home_sale)
            tvSendPrice = item.find(R.id.tv_home_send_price)
        }

        fun bindData(seller: Seller) {
            tvTitle.text = seller.name
            //图片路径http://127.0.0.1:8090/image?name=takeout/imgs/seller/3.jpg
            println("seller.ensure====" + seller.ensure)
            Picasso.with(context).load(host + seller.ensure).into(ivLogo)
            rbScore.rating = seller.score.toFloat()
            tvSale.text = "月售${seller.sale}单"
            tvSendPrice.text = "￥${seller.sendPrice}起送/配送费￥${seller.deliveryFee}"
        }
    }

    //存放图片的url和名称
    var url_maps: HashMap<String, Int> = HashMap()

    //内部类，title的holder
    inner class TitleHolder(item: View) : RecyclerView.ViewHolder(item) {

        val sliderLayout: SliderLayout

        init {
            sliderLayout = item.findViewById(R.id.slider)
        }

        fun bindData(data: String) {
            if (url_maps.size == 0) {
                url_maps.put("Hannibal", R.mipmap.pic1);
                url_maps.put("Big Bang Theory", R.mipmap.pic2);
                url_maps.put("House of Cards", R.mipmap.pic3);
                url_maps.put("Game of Thrones", R.mipmap.pic4);
                for ((key, value) in url_maps) {
                    val textSlideView: TextSliderView = TextSliderView(context)
                    textSlideView.description(key).image(value)
                    sliderLayout.addSlider(textSlideView)
                }

            }
        }
    }
}

ServlertConfig.java中新增配置请求图片的servelet

handler.addServlet(new ServletHolder(new TakeoutImgServlet()), "/takeoutImg");

TakeoutImgServlet.java请求的图片的方法：http://127.0.0.1:8090/image?name=takeout/imgs/seller/3.jpg其中takeout/imgs/seller/3.jpg是url

package cn.ldw.servlet;

import android.os.Environment;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TakeoutImgServlet extends BaseServlet {

	private static final long serialVersionUID = 1L;

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		resp.setStatus(HttpServletResponse.SC_OK);
		String name = req.getParameter("name");
		String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + "Apaches/" + name;
		File file = new File(path);
		long length = file.length();
		resp.setContentLength((int) length);
		OutputStream out = resp.getOutputStream();
		FileInputStream stream = new FileInputStream(file);
		int count = -1;
		byte[] buffer = new byte[1024];
		while ((count = stream.read(buffer)) != -1) {
			out.write(buffer, 0, count);
			out.flush();
		}
		stream.close();
		out.close();
	}
}

效果图如下：