Android Studio实现解析HTML获取json，解析json图片URL，将URL存到list，进行瀑布流展示

dependencies {implementation 'com.squareup.picasso:picasso:2.71828'implementation fileTree(dir: 'libs', include: ['*.jar'])implementation 'com.airbnb.android:lottie:3.0.3'implementation 'com.facebook.fresco:fresco:0.9.0+'implementation 'org.jsoup:jsoup:1.14.1'implementation 'com.squareup.okhttp3:okhttp:4.9.1'implementation 'com.github.bumptech.glide:glide:4.12.0'annotationProcessor 'com.github.bumptech.glide:compiler:4.12.0'implementation 'com.readystatesoftware.sqliteasset:sqliteassethelper:+'implementation 'androidx.sqlite:sqlite:2.2.0'implementation fileTree(dir: 'libs', include: ['*.jar'])implementation 'com.google.code.gson:gson:2.8.9'implementation 'com.alibaba:fastjson:1.2.67'implementation("com.squareup.okhttp3:okhttp:4.10.0")}

AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

 <applicationandroid:usesCleartextTraffic="true">

错误

如果出现错误：app:checkDebugDuplicateClasses
参考这篇博客尝试解决

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><androidx.recyclerview.widget.RecyclerViewandroid:id="@+id/recyclerView"android:layout_width="match_parent"android:layout_height="match_parent" /></RelativeLayout>

item_image.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"android:padding="5dp"><ImageViewandroid:id="@+id/imageView"android:layout_width="200dp"android:layout_height="200dp"android:scaleType="centerCrop"android:adjustViewBounds="true" /></LinearLayout>

MainActivity

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.StaggeredGridLayoutManager;
import android.os.Bundle;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.regex.Matcher;
import java.util.regex.Pattern;public class MainActivity extends AppCompatActivity {private RecyclerView mRecyclerView;private ImageAdapter mImageAdapter;public String html = "https://2k317b5009.goho.co/images/List?type=breakfast";private List<ImageModel> mImageUrlsList = new ArrayList<>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//使用单线程的线程池来异步执行 callable 对象中的任务，并在任务执行完成后获取结果并显示图片和进行其他操作//使用 ExecutorService 来执行一个 Callable 对象，并获取它的返回结果//创建一个单线程的线程池，用于执行任务ExecutorService executor = Executors.newSingleThreadExecutor();//将 callable 对象提交给线程池进行执行，并返回一个 Future 对象，该对象可以用于获取任务的执行结果Future<List<ImageModel>> future = executor.submit(callable);try {//通过调用 future.get() 方法来阻塞主线程，直到任务执行完成并返回结果。在这里，我们将返回的结果赋值给 imageUrls 变量List<ImageModel> imageUrls = future.get();//将获取到的图片列表传递给 showImages 方法，以显示图片和后续操作showImages(imageUrls);} catch (InterruptedException | ExecutionException e) {e.printStackTrace();} catch (Exception e) {throw new RuntimeException(e);} finally {executor.shutdown();}}private void showImages(List<ImageModel> imageUrls) {LinearLayoutManager layoutManager = new LinearLayoutManager(this);mRecyclerView.setLayoutManager(layoutManager);mRecyclerView = findViewById(R.id.recyclerView);//通过设置RecyclerView的布局管理器为StaggeredGridLayoutManager，并指定每行或每列的单元格数量和布局方向，就可以实现错乱瀑布流的效果//spanCount：指定每行或每列的单元格数量。在这个例子中，设置为2，表示每行有两个单元格。//orientation：指定布局的方向,VERTICAL表示垂直mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL));//自定义的适配器类 将数据绑定到RecyclerView中的每个列表项上ImageAdapter adapter = new ImageAdapter(imageUrls, this);//调用RecyclerView的setAdapter()方法，将适配器与RecyclerView关联mRecyclerView.setAdapter(adapter);}/*** 使用 java.util.concurrent 包来执行并发任务，可以通过创建 ExecutorService 和 Future 对象来实现* 在 onCreate() 方法中，我们创建了一个单线程的 ExecutorService，然后通过 submit() 方法将 HtmlParserTask 提交给线程池进行执行。* 接着，我们使用 future.get() 来获取并发任务的结果，并调用 showImages() 方法来展示图片*/Callable<List<ImageModel>> callable = new Callable<List<ImageModel>>() {@Overridepublic List<ImageModel> call() throws Exception {List<ImageModel> imageModels = new ArrayList<>();// 解析 HTML 获取图片 URL 的逻辑Document document = Jsoup.connect(html).get();//使用 Jsoup 连接到给定的 HTML 页面，并使用 body().text() 方法获取页面的纯文本内容String jsonString = document.body().text();//转换成objectJSONObject jsonObject = new JSONObject(jsonString);//从jsonObject里面找一个ImageList的对象JSONArray jsonArray = jsonObject.getJSONArray("ImageList");String imageUrl = null;//开始遍历for (int i = 0; i < jsonArray.length(); i++) {//遍历ImageList里面的每个对象JSONObject item = jsonArray.getJSONObject(i);// 检查是否存在 "src" 键if (item.has("src")) {imageUrl = item.getString("src");//Log.e(TAG,imageUrl);imageModels.add(new ImageModel(imageUrl));}}return imageModels;}};
}

Image适配器

import static android.content.ContentValues.TAG;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.squareup.picasso.Picasso;
import java.util.List;
import java.util.Random;//适配器类
public class ImageAdapter extends RecyclerView.Adapter<ImageAdapter.ImageViewHolder> {private List<ImageModel> imageList;private Context context;//有参构造public ImageAdapter(List<ImageModel> imageList, Context context) {Log.e(TAG, "ImageAdapter thread id= "+ Thread.currentThread().getId() + " name="+Thread.currentThread().getName());this.imageList = imageList;this.context = context;}//onCreateViewHolder() 方法用于创建RecyclerView的每个列表项的视图@NonNull@Overridepublic ImageViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {View view = LayoutInflater.from(context).inflate(R.layout.item_image, parent, false);return new ImageViewHolder(view);}//onBindViewHolder() 方法用于将数据绑定到ViewHolder中的视图@Overridepublic void onBindViewHolder(@NonNull ImageViewHolder holder, int position) {ImageModel imageModel = imageList.get(position);//获取特定位置的图像模型（ImageModel）对象，并从中获取图像URLString imageUrl = imageModel.getImageUrl();//使用Picasso库加载图像URL并显示在ViewHolder的ImageViewPicasso.get().load(imageUrl).fit().centerCrop().into(holder.imageView);// 设置图片的高度为随机高度，以实现错乱瀑布流效果ViewGroup.LayoutParams layoutParams = holder.imageView.getLayoutParams();layoutParams.height = getRandomHeight();//随机高度holder.imageView.setLayoutParams(layoutParams);}// 获取随机高度private int getRandomHeight() {Random random = new Random();return random.nextInt(400) + 300; // 设置图片高度范围为300-700之间的随机值}//返回图像列表的大小，即列表中包含的图像数量@Overridepublic int getItemCount() {return imageList.size();}//设置适配器的图像列表public void setImageList(List<ImageModel> imageList) {this.imageList = imageList;}public class ImageViewHolder extends RecyclerView.ViewHolder {ImageView imageView;//持有每个列表项的视图组件，这里是一个ImageViewpublic ImageViewHolder(@NonNull View itemView) {super(itemView);imageView = itemView.findViewById(R.id.imageView);}}
}

ImageModel 接收图片URL

//接收图片url
public class ImageModel {private String imageUrl;public ImageModel(String imageUrl) {this.imageUrl = imageUrl;}public void setImageUrl(String imageUrl) {this.imageUrl = imageUrl;}public String getImageUrl() {return imageUrl;}
}