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最新推荐文章于 2024-04-24 07:56:33 发布

原创最新推荐文章于 2024-04-24 07:56:33 发布 · 365 阅读

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本示例展示了如何使用Android应用程序加载优快云的技术区帖子列表，并通过RecyclerView展示列表项。应用采用OkHttp进行网络请求，XmlPullParser解析XML数据。

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<?xml version="1.0" encoding="utf-8"?> rgb(43,43,43);"><LinearLayout 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:orientation="vertical" android:layout_height="match_parent" tools:context="com.example.csdn.MainActivity"> ,106);"> 43,43);"> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@color/colorPrimary" app:logo="@mipmap/ic_launcher" app:title="优快云 → 版主推荐-技术区帖子讨论列表" app:titleTextColor="#FFF" /> rgb(43,43,43);"> <android.support.v7.widget.RecyclerView android:id="@+id/rv" android:layout_width="match_parent" android:layout_height="match_parent"> style="background-color:rgb(43,43,43);"> </android.support.v7.widget.RecyclerView> ,106);"> style="background-color:rgb(43,43,43);"></LinearLayout>

<?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="10dp">
    <TextView
        android:id="@+id/item_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:textColor="@color/colorAccent"
        android:text="关于ClientWebSocket的异步转同步，我把这个项目搬出来，讲讲清楚" />
    <TextView
        android:id="@+id/item_summary"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="14sp"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:text="关于ClientWebSocket的异步转同步，我把这个项目搬出来，讲讲清楚" />
    <TextView
        android:id="@+id/item_author"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="14sp"
        android:text="作者：shawb" />
    <ImageView
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:background="@color/colorPrimary"
        android:layout_marginTop="10dp"/>
</LinearLayout>

package com.example.csdn;

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private Toolbar toolbar;
    private RecyclerView rv;
    private LinearLayoutManager manager;
    private List<EntryBean> mDatas;
    private EntryAdapter adapter;
    public String url = "http://bbs.youkuaiyun.com/recommend_tech_topics.atom";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
//        查找控件
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        rv = (RecyclerView) findViewById(R.id.rv);
//        设置布局管理器
        manager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL,false);
        rv.setLayoutManager(manager);
//        设置数据源
        mDatas = new ArrayList<>();
//        设置适配器
        adapter = new EntryAdapter(this,mDatas);
        rv.setAdapter(adapter);
//        获取网络数据
        loadWebData(url);
    }
    private void loadWebData(final String url) {
//        加载网络数据的方法
        new AsyncTask<Void,Void,String>(){
            @Override
            protected String doInBackground(Void... params) {
                String s = HttpUtils.getStringByOkHttp(url);
                return s;
            }
            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                if (s!=null) {
//                    解析数据
                    List<EntryBean> beanList = ParseXMLData.parseXml(s);
//                    将网络的集合添加到数据源当中
                    mDatas.addAll(beanList);
//                    提示数据更新
                    adapter.notifyDataSetChanged();
                }
            }
        }.execute();
    }
}

package com.example.csdn;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;
import java.io.ByteArrayInputStream;
import java.util.ArrayList;
import java.util.List;
/**
 * Created by Administrator on 2018/3/5.
 */
public class ParseXMLData {
    public static List<EntryBean> parseXml(String s){
        List<EntryBean>mDatas = new ArrayList<>();
//  1.工厂    2，解析器     3，设置解析数据    4.获取解析码
        try {
            XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
            XmlPullParser pullParser = factory.newPullParser();
            ByteArrayInputStream baos = new ByteArrayInputStream(s.getBytes());
            pullParser.setInput(baos,"utf-8");
            int type = pullParser.getEventType();
            EntryBean bean = null;
            while (type != XmlPullParser.END_DOCUMENT) {
                String name = pullParser.getName();
                switch (type) {
                    case XmlPullParser.START_TAG:
                        if (name.equals("entry")) {
                            bean = new EntryBean();
                        }else if (name.equals("title")) {
                            if (bean!=null) {
                                bean.setTitle(pullParser.nextText());
                            }
                        }else if (name.equals("summary")) {
                            bean.setSummary(pullParser.nextText());
                        }else if (name.equals("author")) {
                            bean.setAuthor(pullParser.nextText());
                        }
                        break;
                    case XmlPullParser.END_TAG:
                        if (name.equals("entry")) {
                            mDatas.add(bean);
                        }
                        break;
                }
                type = pullParser.next();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return mDatas;
    }
}

package com.example.csdn;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import java.util.List;
/**
 * Created by Administrator on 2018/3/5.
 */
public class EntryAdapter extends RecyclerView.Adapter<EntryAdapter.EntryViewHolder>{
    private Context context;
    private List<EntryBean>mDatas;
    public EntryAdapter(Context context, List<EntryBean> mDatas) {
        this.context = context;
        this.mDatas = mDatas;
    }
    @Override
    public EntryViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(context).inflate(R.layout.item_rv,parent,false);
        EntryViewHolder holder = new EntryViewHolder(itemView);
        return holder;
    }
    @Override
    public void onBindViewHolder(EntryViewHolder holder, int position) {
        final EntryBean bean = mDatas.get(position);
        holder.titleTv.setText(bean.getTitle());
        holder.summaryTv.setText(bean.getSummary());
        holder.authorTv.setText("作者："+bean.getAuthor());
//        添加每一项的点击事件
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(context,bean.getTitle(),Toast.LENGTH_SHORT).show();
            }
        });
    }
    @Override
    public int getItemCount() {
        return mDatas.size();
    }
    class EntryViewHolder extends RecyclerView.ViewHolder{
        TextView titleTv,summaryTv,authorTv;
        public EntryViewHolder(View itemView) {
            super(itemView);
            titleTv = (TextView) itemView.findViewById(R.id.item_title);
            summaryTv = (TextView) itemView.findViewById(R.id.item_summary);
            authorTv = (TextView) itemView.findViewById(R.id.item_author);
        }
    }
}

package com.example.csdn;

/**
 * Created by Administrator on 2018/3/5.
 * <entry>
 <id>http://bbs.youkuaiyun.com/topics/392327427</id>
 <published>2018-03-02T23:04:14+08:00</published>
 <updated>2018-03-04T12:58:14+08:00</updated>
 <link rel="alternate" type="text/html" href="http://bbs.youkuaiyun.com/topics/392327427"/>
 <title>关于ClientWebSocket的异步转同步，我把这个项目搬出来，讲讲清楚</title>
 <summary>关于ClientWebSocket的异步转同步，我把这个项目搬出来，讲讲清楚</summary>
 <author>shawb</author>
 </entry>
 */

public class EntryBean {
    private String title;
    private String summary;
    private String author;
    public EntryBean() {
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getSummary() {
        return summary;
    }
    public void setSummary(String summary) {
        this.summary = summary;
    }
    public String getAuthor() {
        return author;
    }
    public void setAuthor(String author) {
        this.author = author;
    }
}

package com.example.csdn;

import java.io.IOException;

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.ResponseBody;

/**
 * Created by Administrator on 2018/3/5.
 */

public class HttpUtils {
    public static String getStringByOkHttp(String path){
//        1.客户端对象
        OkHttpClient client = new OkHttpClient();
//        2.请求对象
        Request request = new Request.Builder().get().url(path).build();
//        3.开始执行请求，获取响应对象
        try {
            Response response = client.newCall(request).execute();
//            4.判断响应是否成功
            if (response.isSuccessful()) {
//                5.获取响应体内容
                ResponseBody body = response.body();
                return body.string();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

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

compile 'com.android.support:recyclerview-v7:26.1.0'
compile files('libs/okhttp-3.2.0.jar')
compile files('libs/okio-1.8.0.jar')