锦州网站推广,企业网站特色建设,ps网页设计尺寸规范,详情页设计图片目录 效果activity_main.xmlMainActivityImageItemImageAdapter 效果 项目本来是要做成图片保存到手机然后读取数据后瀑布流展示#xff0c;但是有问题#xff0c;目前只能做到保存到手机
activity_main.xml
?xml version1.0 encodingutf-8?… 目录 效果activity_main.xmlMainActivityImageItemImageAdapter 效果 项目本来是要做成图片保存到手机然后读取数据后瀑布流展示但是有问题目前只能做到保存到手机
activity_main.xml
?xml version1.0 encodingutf-8?
LinearLayout xmlns:androidhttp://schemas.android.com/apk/res/androidxmlns:apphttp://schemas.android.com/apk/res-autoxmlns:toolshttp://schemas.android.com/toolsandroid:layout_widthmatch_parentandroid:layout_heightmatch_parenttools:context.MainActivityandroid:orientationhorizontalButtonandroid:idid/buttonandroid:layout_widthmatch_parentandroid:layout_heightwrap_contentandroid:text生成瀑布流tools:ignoreMissingConstraints /androidx.recyclerview.widget.RecyclerViewandroid:idid/recycler_viewandroid:layout_widthmatch_parentandroid:layout_heightmatch_parent //LinearLayoutMainActivity
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;import android.Manifest;
import android.annotation.SuppressLint;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.os.FileUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;import com.bumptech.glide.Glide;
import com.bumptech.glide.request.target.CustomTarget;
import com.bumptech.glide.request.transition.Transition;import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;public class MainActivity extends AppCompatActivity {private ImageView imageView;private static final String TAG MainActivity;private static final int PERMISSION_REQUEST_CODE 1;private Button mButton;private ListImageItem mImageList;private RecyclerView mRecyclerView;private ImageAdapter mAdapter;SuppressLint(MissingInflatedId)Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mButton findViewById(R.id.button);mImageList new ArrayList();mRecyclerView findViewById(R.id.recycler_view);mRecyclerView.setLayoutManager(new LinearLayoutManager(this));mAdapter new ImageAdapter(mImageList, this);mRecyclerView.setAdapter(mAdapter);mButton.setOnClickListener(new View.OnClickListener() {Overridepublic void onClick(View view) {if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)! PackageManager.PERMISSION_GRANTED) {ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},PERMISSION_REQUEST_CODE);} else {// 开始解析HTML并下载图片startParsingAndDownloading();imageView findViewById(R.id.image_view);Log.e(TAG,开始解析HTML并下载图片);}}});}Overridepublic void onRequestPermissionsResult(int requestCode, NonNull String[] permissions, NonNull int[] grantResults) {super.onRequestPermissionsResult(requestCode, permissions, grantResults);if (requestCode PERMISSION_REQUEST_CODE) {if (grantResults.length 0 grantResults[0] PackageManager.PERMISSION_GRANTED) {// 写入外部存储权限已授予解析HTML并下载图片new ParseHtmlTask().execute(https://example.com); // 替换为你要解析的HTML网页URL} else {// 用户拒绝了权限请求可以根据需要进行处理}}}//开始解析HTMLprivate void startParsingAndDownloading() {new ParseHtmlTask().execute(https://home.meishichina.com/show-top-type-recipe.html);}private class ParseHtmlTask extends AsyncTaskString, Void, ListImageItem {Overrideprotected ListImageItem doInBackground(String... urls) {String url urls[0];Document document null;try {document Jsoup.connect(url).get();Elements imgElements document.select(div.pic);for (Element element : imgElements) {String imgUrl element.select(a).select(img).attr(data-src);mImageList.add(new ImageItem(imgUrl));downloadImage(imgUrl);}} catch (IOException e) {Log.e(TAG,111);//throw new RuntimeException(e);}return mImageList;}Overrideprotected void onPostExecute(ListImageItem imageList) {mAdapter.notifyDataSetChanged();}private void downloadImage(String imgUrl) {Glide.with(MainActivity.this).downloadOnly().load(imgUrl).into(new CustomTargetFile() {Overridepublic void onResourceReady(NonNull File resource, Nullable Transition? super File transition) {// 下载完成后的处理逻辑可根据需求进行保存或其他操作// 这里将图片文件保存到手机的公共图片目录下String fileName image_ System.currentTimeMillis() .jpg;File destFile new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), fileName);try {copyFile(resource, destFile);} catch (IOException e) {e.printStackTrace();}}Overridepublic void onLoadCleared(Nullable Drawable placeholder) {// 可选的清除逻辑}});}private void copyFile(File sourceFile, File destFile) throws IOException {InputStream inputStream null;OutputStream outputStream null;try {inputStream new FileInputStream(sourceFile);outputStream new FileOutputStream(destFile);byte[] buffer new byte[1024];int length;while ((length inputStream.read(buffer)) ! -1) {outputStream.write(buffer, 0, length);}} finally {if (inputStream ! null) {inputStream.close();}if (outputStream ! null) {outputStream.close();}}}ImageItem
public class ImageItem {private String imageUrl;public ImageItem(String imageUrl) {this.imageUrl imageUrl;}public String getImageUrl() {return imageUrl;}
}
ImageAdapter
import android.content.Context;
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.bumptech.glide.Glide;import java.util.List;public class ImageAdapter extends RecyclerView.AdapterImageAdapter.ViewHolder {private ListImageItem imageList;private Context context;public ImageAdapter(ListImageItem imageList, Context context) {this.imageList imageList;this.context context;}NonNullOverridepublic ViewHolder onCreateViewHolder(NonNull ViewGroup parent, int viewType) {View view LayoutInflater.from(context).inflate(R.layout.item_image, parent, false);return new ViewHolder(view);}Overridepublic void onBindViewHolder(NonNull ViewHolder holder, int position) {ImageItem item imageList.get(position);String imageUrl item.getImageUrl();// 使用Glide加载图片Glide.with(context).load(imageUrl).into(holder.imageView);}Overridepublic int getItemCount() {return imageList.size();}public class ViewHolder extends RecyclerView.ViewHolder {ImageView imageView;public ViewHolder(NonNull View itemView) {super(itemView);imageView itemView.findViewById(R.id.image_view);}}
}
