1、图源API
在问度娘之后发现了几个可用的API，主要来自下面几个博主的分享
在线随机美图API接口服务
可以获取随机图片的API收集
随机图片API接口
最终自己测试使用的是下面三个网址：
https://uploadbeta.com/api/pictures/random //必应推荐
https://img.xjh.me/random_img.php //二次元
url返回text/html文本需要进行解析，python处理文本内容示例，获取img的src
import requests
import json
import redef find_img_src(html):replace_pattern = r'<[img|IMG].*?/>' #img标签的正则式img_url_pattern = r'.+?src="(\S+)"' #img_url的正则式replaced_img_url_list = []img_url_list = []need_replace_list = re.findall(replace_pattern, html)#找到所有的img标签for tag in need_replace_list:img_url_list.append(re.findall(img_url_pattern, tag)[0])#找到所有的img_urlreturn img_url_listheaders = {"User-Agent": "Mozilla/5.0"}
#"Content-Type": "text/html" ,这个返回的是text
#text中含有图片地址的src标签
# response = requests.get("https://cdn.mom1.cn/?mom=306",headers = headers)#"Content-Type": "text/html" ,这个返回的是text
#text中含有图片地址的src标签
response = requests.get("https://img.xjh.me/random_img.php")
print(response.text)
url_list = find_img_src(response.text) #返回url列表#"Content-Type": "image/jpeg" 或者网站直接返回的是图片
# response = requests.get("https://uploadbeta.com/api/pictures/random",headers = headers)
for i in url_list:response = requests.get("https:"+i, headers=headers)print(response.status_code)if response.status_code == 200:if (response.headers!=None):print(json.dumps(dict(response.headers),indent=1)) #indent缩排，使得换行显示if (response.content!=None):# print(response.text)open(r'C:\Users\******\Desktop\erci.png','wb').write(response.content) # 将内容写入图片print("done")
java从文本中解析出图片的url示例，参考Java获取img标签里的src路径
public List<String>getImgSrc(String content){ List<String>list=new ArrayList<String>();Pattern p_img=Pattern.compile("<(img|IMG)(.*?)(/>|></img>|>)");Matcher m_img=p_img.matcher(content); //matcher方法返回对象boolean result_img=m_img.find();if(result_img){while(result_img){String str_img=m_img.group(2); //捕获组Pattern p_src=Pattern.compile("(src|SRC)=(\"|\')(.*?)(\"|\')");Matcher m_src=p_src.matcher(str_img);if(m_src.find()){String str_src=m_src.group(3);list.add(str_src);}//结束匹配<img/>标签中的src//匹配content中是否存在下一个<img/>标签，有则继续以上步骤匹配<img/>标签中的srcresult_img=m_img.find();}}return list;}
https://cdn.mom1.cn/img/mom2018%20(666).jpg //妹子大图
2、JAVA获取图片
使用okhttp包，建立http连接，得到输入流，再进行解码，关于图片的解析与处理，参考Bitmap的inJustDecodeBounds属性，下面是代码示例
class Network_http_optimize {OkHttpClient myokHttpClient = new OkHttpClient().newBuilder()
// .connectTimeout(5, TimeUnit.SECONDS) //设置连接超时
// .readTimeout(5,TimeUnit.SECONDS).build();//创建get请求函数public InputStream getInputStream(String url) throws IOException {Request request = new Request.Builder().url(url).get().build();Response response = myokHttpClient.newCall(request).execute();return response.body().byteStream();}//创建get请求函数public String getString(String url) throws IOException {Request request = new Request.Builder().url(url).get().build();Response response = myokHttpClient.newCall(request).execute();return response.body().string();}}public class Network_http extends Thread {String im_group_url = null;InputStream inputStream = null;String result_json_data = null;JSONArray data_array = null;int category ;Message msg = new Message();Bitmap bitmap = null;@Overridepublic void run() {Network_http_optimize network_http_optimize = new Network_http_optimize();category = (int)(Math.random()*10)%3; switch(category) {case 0:String im_url = "https://cdn.mom1.cn/img/mom2018%20("+(int)(Math.random()*1000)+").jpg"; bitmap = Get_img_and_scale(im_url);if (bitmap==null){System.out.println("未获取到图片->美女");}msg.what = 1;msg.obj = new Image_object(im_url,bitmap);my_handler.sendMessage(msg); //每一张图片我就发送一个消息break;case 1:String im_url_1 = "https://uploadbeta.com/api/pictures/random";Bitmap bitmap = Get_img_and_scale(im_url_1); if (bitmap==null){System.out.println("未获取到图片->必应");}msg.what = 1;msg.obj = new Image_object(im_url_1,bitmap);my_handler.sendMessage(msg); //每一张图片我就发送一个消息break;case 2://这种返回的是text文本，包含img的src标签，通过正则表达式，可以获取图片正真的网络地址String im_url_2 = "https://img.xjh.me/random_img.php"; //二次元图片APItry {String text = network_http_optimize.getString(im_url_2);List src_list = getImgSrc(text); //成功得到src资源im_url_2 = "https:"+src_list.get(0).toString(); //得到真实的urlbitmap = Get_img_and_scale(im_url_2); if (bitmap==null){System.out.println("未获取到图片->二次元");}msg.what = 1;msg.obj = new Image_object(im_url_2,bitmap);my_handler.sendMessage(msg); //每一张图片我就发送一个消息} catch (IOException e) {e.printStackTrace();}break;default:break;}}public Bitmap Get_img_and_scale(String url) {Network_http_optimize network_http_optimize = new Network_http_optimize();Bitmap bitmap = null;try {InputStream inputStream = network_http_optimize.getInputStream(url);BitmapFactory.Options options = new BitmapFactory.Options();options.inJustDecodeBounds = true;//不返回实际的bitmap，但可以通过这个bitmap获取图片的宽和高bitmap = BitmapFactory.decodeStream(inputStream, null,options);float realWidth = options.outWidth;float realHeight = options.outHeight;System.out.print("真实图片高度：" + realHeight + " 宽度:" + realWidth+" ");int scale = (int) ((realHeight > realWidth ? realHeight : realWidth) / 1000); if (scale <= 0) { scale = 1; }System.out.println("缩放scale："+scale);inputStream.close();options.inSampleSize = scale;options.inJustDecodeBounds = false;//注意这次要把options.inJustDecodeBounds 设为 false，这次图片是要读取出来的inputStream = network_http_optimize.getInputStream(url); //重新载入，读取数据流的bitmap = BitmapFactory.decodeStream(inputStream,null,options);inputStream.close();} catch (IOException e) {e.printStackTrace();System.out.println("请求出现错误");}return bitmap;}public List<String>getImgSrc(String content){ List<String>list=new ArrayList<String>();Pattern p_img=Pattern.compile("<(img|IMG)(.*?)(/>|></img>|>)");Matcher m_img=p_img.matcher(content); //matcher方法返回对象boolean result_img=m_img.find();if(result_img){while(result_img){String str_img=m_img.group(2);Pattern p_src=Pattern.compile("(src|SRC)=(\"|\')(.*?)(\"|\')");Matcher m_src=p_src.matcher(str_img);if(m_src.find()){String str_src=m_src.group(3);list.add(str_src);}//结束匹配<img/>标签中的src//匹配content中是否存在下一个<img/>标签，有则继续以上步骤匹配<img/>标签中的srcresult_img=m_img.find();}}return list;}}
3、显示到ListVIEW
继承adapter，建立图片对象，加载自己的布局文件，实现图片显示
public class Image_object {String im_description;Bitmap im_self;int im_drawable_id;public Image_object(String im_discription,Bitmap im_self){this.im_description = im_discription;this.im_self = im_self;}public Image_object(String im_discription,int im_drawable_id){this.im_description = im_discription;this.im_drawable_id = im_drawable_id;}public String getIm_description(){return im_description;}public Bitmap getIm_self(){return im_self;}public int getIm_drawable_id(){return im_drawable_id;}}public class UserListAdapter extends ArrayAdapter {private int resourceId;public UserListAdapter(Context context, int textViewResourceId, List objects) {super(context, textViewResourceId, objects);resourceId = textViewResourceId;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {Image_object image_object = (Image_object) getItem(position); View view;if(convertView==null){ view= LayoutInflater.from(getContext()).inflate(resourceId,parent,false);}else {view=convertView;}TextView imagedescription = view.findViewById(R.id.image_discription);ImageView imageself = view.findViewById(R.id.image_self);imagedescription.setText(image_object.getIm_description());imageself.setImageBitmap(image_object.getIm_self());return view;}}
4、实现图片的点击放大与保（dialog方法）
继承dialog，添加初始化的方法，在onCreate当中设置点击与长按的监听事件，点击图片将使得dialog取消，长按将进入保存设置。方法参考点击图像显示大图Dialog，保存图片可以详细看下这篇文章Android中保存图片到本地功能实现，下面是代码示例
package com.example.pbrowser;import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.graphics.Point;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;import androidx.annotation.NonNull;public class Photo_zoom_dialog extends Dialog {public Photo_zoom_dialog(@NonNull Context context) {super(context); //需要构造方法}public Photo_zoom_dialog setBitmap(Bitmap bitmap){ //方法this.bitmap = bitmap;return this;}ImageView imageView;Bitmap bitmap;AlertDialog alertDialog;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.z_zoom_photo);//按空白处能取消动画setCanceledOnTouchOutside(true);imageView = findViewById(R.id.my_picture);Point point = new Point();getWindow().getWindowManager().getDefaultDisplay().getSize(point);if (bitmap != null){imageView.setImageBitmap(bitmap); Window win = getWindow(); //设置显示图片区域大小WindowManager.LayoutParams lp = win.getAttributes();lp.gravity = Gravity.CENTER;//如果宽度小于point.x,会按原尺寸显示，大于就屏宽显示lp.height = WindowManager.LayoutParams.WRAP_CONTENT; //高度设置成自适应lp.width = point.x; //这个跟手机有关系，我的HD+为720，FHD+为1080win.setAttributes(lp);getWindow().setBackgroundDrawableResource(android.R.color.transparent); //去点dialog的白边}imageView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Photo_zoom_dialog.super.dismiss(); //调用对象自己dismiss()方法}});imageView.setOnLongClickListener(new View.OnLongClickListener() {@Overridepublic boolean onLongClick(View v) {alertDialog = new AlertDialog.Builder(getContext()).setMessage("保存图片").setPositiveButton("确定", new DialogInterface.OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which) {}}).setNegativeButton("取消",null).create();alertDialog.show();return false;}});}
}调用就非常简单，点击ListVIEW的item,创建dialog对象，实现图片显示，代码示例
myListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position, long id) {Image_object image_object = (Image_object) display_image_list.get(position);Photo_zoom_dialog photo_zoom_dialog = new Photo_zoom_dialog(getContext());photo_zoom_dialog.setBitmap(image_object.getIm_self());photo_zoom_dialog.show();}});
