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打开嗅事百科 按 f12 查看源码
我对网页了解也不是太多，在网上查了一些资料，然后就开始上手了，对于网址的处理可以使用开源库，我使用了Jsoup
首先添加依赖库implementation 'org.jsoup:jsoup:1.11.3'
具体的内容请查看Jsoup
下面看我的主活动
很显然我首先调用了方法init((++id) % 13);
参数其实不重要，这是我为了给listview刷新用的，因为我发现嗅事百科的下一页内容就是网址里面的一个数字加了一，但是最多十三页，所以我就取余了，看这个方法，实际上是另开了一个线程去进行网络请求，当请求完后就通知Handler更新UI，最初做的时候，我切换线程加载HTML后，不知道该如何处理网络请求和UI更新，因为，当网络请求没有结束时是不能更新UI的，就算是更新了但也存在一个问题，我在这个线程请求网络，如果适配器不为空了便可以更新UI了，但是更新完后，网络请求的这个线程还没结束，所以适配器内容就和UI上显示的不一样，然后你要是处理listview的点击事件就会崩掉，最后我使用了Handler，我让线程去进行网络请求，当线程结束时再通知Handler进行UI更新。
方法里面
Jsoup.connect();
是为了把源码解析出来
document.select(“a.contentHerf”);
可以由我截图圈的发现正文正是a.contentHerf下的 ，所以把他当做条件筛选即可，然后会返回多个数据，逐个遍历即可，看代码里面的循环
element.text() 便是得到正文部分了
另外一个
element.attr(“href”) 是筛选href下的内容了，这个是什么呢
我们把嗅事百科这个正文点击一下进入详情页，观察网址，是不是https://www.qiushibaike.com+href呢？之所以弄这个原因是有的文章太长，不能一次性显示完，所以就要进入详情页继续爬，我这里的实现是点击点击这个listview子项就重新启动一个活动，访问这个详情页的网址，然后展示出来，其实这个网页里面还会有图片，或者视频，大家看我圈的一个内容，src便签下的东西便是图片的地址了，大家可以自行拓展，把这些视频图片和头像都可以趴下来，展示出来，还有一个要说的事适配器的Thing这个有两个成员变量，一个是解析出的正文，还有就是详情页的地址了，地址传给另一个活动，即可把所有的内容爬下来。
public class MainActivity extends AppCompatActivity {
private SmartRefreshLayout smartRefreshLayout;
private String TAG = "MainActivity";
private List<Thing> things = new ArrayList<>();
ListView listView;
XiuAdapter adapter;
private int id = 0;
private Handler handler;
@SuppressLint("HandlerLeak")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = findViewById(R.id.xiuShi);
smartRefreshLayout = findViewById(R.id.smart_layout);
smartRefreshLayout.setEnableRefresh(true);//启用刷新
smartRefreshLayout.setEnableLoadmore(true);//启用加载
init((++id) % 13);
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg.what == 111) {
adapter = new XiuAdapter(MainActivity.this, R.layout.thing_item, things);
listView.setAdapter(adapter);
}
}
};
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Thing thing = things.get(position);
Intent intent = new Intent(MainActivity.this, ContentActivity.class);
intent.putExtra("url", thing.getAddress());
startActivity(intent);
}
});
smartRefreshLayout.setOnRefreshListener(new OnRefreshListener() {
@Override
public void onRefresh(RefreshLayout refreshlayout) {
refresh((++id) % 13);
}
});
smartRefreshLayout.setOnLoadmoreListener(new OnLoadmoreListener() {
@Override
public void onLoadmore(RefreshLayout refreshlayout) {
moreContent((++id) % 13);
}
});
}
private void moreContent(int i) {
new Thread(new Runnable() {
@Override
public void run() {
try {
Document document = Jsoup.connect(
"https://www.qiushibaike.com/8hr/page/" + id + "/").get();
Elements elements = document.select("a.contentHerf");
for (int i = 0; i < elements.size(); i++) {
Element element = elements.get(i);
Thing thing = new Thing(" " + element.text() + "",
"https://www.qiushibaike.com" + element.attr("href"));
things.add(thing);
}
runOnUiThread(new Runnable() {
@Override
public void run() {
adapter.notifyDataSetChanged();
smartRefreshLayout.finishLoadmore();
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
}
private void refresh(final int id) {
new Thread(new Runnable() {
@Override
public void run() {
try {
things.clear();
Document document = Jsoup.connect(
"https://www.qiushibaike.com/8hr/page/" + id + "/").get();
Elements elements = document.select("a.contentHerf");
for (int i = 0; i < elements.size(); i++) {
Element element = elements.get(i);
Thing thing = new Thing(" " + element.text() + "",
"https://www.qiushibaike.com" + element.attr("href"));
things.add(thing);
}
runOnUiThread(new Runnable() {
@Override
public void run() {
adapter.notifyDataSetChanged();
smartRefreshLayout.finishRefresh();
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
}
private void init(final int id) {
new Thread(new Runnable() {
@Override
public void run() {
try {
Log.d("HTML", "-----------------------");
Document document = Jsoup.connect("https://www.qiushibaike.com/8hr/page/" + id + "/").get();
Elements elements = document.select("a.contentHerf");
for (int i = 0; i < elements.size(); i++) {
Element element = elements.get(i);
Thing thing = new Thing(" " + element.text() + "",
"https://www.qiushibaike.com" + element.attr("href"));
things.add(thing);
Log.d("HTML", thing.getAddress());
Log.d("HTML", element.text());
}
Log.d("HTML", "-----------------------");
Message msg = new Message();
msg.what = 111;
handler.sendMessage(msg);
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
}
}
package com.example.webspider;
public class Thing {
public Thing(String item, String address) {
this.item = item;
this.address = address;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
private String item;
private String address;
public void setItem(String item) {
this.item = item;
}
public String getItem() {
return item;
}
}
package com.example.webspider;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.List;
public class XiuAdapter extends ArrayAdapter<Thing> {
private int id;
public XiuAdapter(@NonNull Context context, int resource, @NonNull List<Thing> objects) {
super(context, resource, objects);
id = resource;
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
View view = LayoutInflater.from(getContext()).inflate(id, parent, false);
Thing thing = getItem(position);
TextView textView = view.findViewById(R.id.thing_name);
textView.setText(thing.getItem());
return view;
}
}
package com.example.webspider;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.IOException;
public class ContentActivity extends AppCompatActivity {
private String url;
private String content = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_content);
final TextView textView = findViewById(R.id.content_thing);
url = getIntent().getStringExtra("url");
final Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg.what == 111) {
textView.setText(" " + msg.obj.toString());
}
}
};
new Thread(new Runnable() {
@Override
public void run() {
try {
Document document = Jsoup.connect(url).get();
Elements elements = document.select("div.content");
for (int i = 0; i < elements.size(); i++) {
Element element = elements.get(i);
Log.d("wds", element.text());
Message msg = new Message();
msg.obj = element.text();
msg.what = 111;
handler.sendMessage(msg);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
}
}
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.scwang.smartrefresh.layout.SmartRefreshLayout
android:id="@+id/smart_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:srlAccentColor="#00000000"
app:srlEnablePreviewInEditMode="true"
app:srlPrimaryColor="#00000000">
<ListView
android:id="@+id/xiuShi"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
>
</ListView>
</com.scwang.smartrefresh.layout.SmartRefreshLayout>
</android.support.constraint.ConstraintLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".ContentActivity">
<ScrollView xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="20dp"
android:layout_marginBottom="20dp">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
app:cardUseCompatPadding="true"
app:cardCornerRadius="10dp"
app:cardBackgroundColor="#FFF8DC">
<TextView
android:id="@+id/content_thing"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp" />
</android.support.v7.widget.CardView>
</ScrollView>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:layout_marginTop="10dp"
app:cardBackgroundColor="#FFF8DC"
app:cardCornerRadius="10dp"
app:cardUseCompatPadding="true">
<TextView
android:id="@+id/thing_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp" />
</android.support.v7.widget.CardView>
implementation 'com.android.support:cardview-v7:28.0.0-rc02'
implementation 'com.scwang.smartrefresh:SmartRefreshLayout:1.0.4-7'
implementation 'com.scwang.smartrefresh:SmartRefreshHeader:1.0.4-7'
<uses-permission android:name="android.permission.INTERNET" />
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