listview展示网络新闻类条目包括图片
首先根据json类型去封装bean
package com.yinyulong.bean; import java.util.List; /** * Created by Alongstorm on 2017/8/7,0007. */ public class InfoBean { private int status; private String info; private List<DataBean> data; public int getStatus() { return status; } public void setStatus(int status) { this.status = status; } public String getInfo() { return info; } public void setInfo(String info) { this.info = info; } public List<DataBean> getData() { return data; } public void setData(List<DataBean> data) { this.data = data; } @Override public String toString() { return "InfoBean{" + "status=" + status + ", info='" + info + '\'' + ", data=" + data + '}'; } public static class DataBean { /** * news_id : 13811 * news_title : 深港澳台千里连线，嘉年华会今夏入川 * news_summary : 6月17—20日，“2016成都深港澳台嘉年华会”(简称嘉年华会)将在成都世纪城国际会展中心举办。其主办方励展华博借力旗 * pic_url : http://f.expoon.com/sub/news/2016/01/21/887844_230x162_0.jpg */ private String news_id; private String news_title; private String news_summary; private String pic_url; public String getNews_id() { return news_id; } public void setNews_id(String news_id) { this.news_id = news_id; } public String getNews_title() { return news_title; } public void setNews_title(String news_title) { this.news_title = news_title; } public String getNews_summary() { return news_summary; } public void setNews_summary(String news_summary) { this.news_summary = news_summary; } public String getPic_url() { return pic_url; } public void setPic_url(String pic_url) { this.pic_url = pic_url; } @Override public String toString() { return "DataBean{" + "news_id='" + news_id + '\'' + ", news_title='" + news_title + '\'' + ", news_summary='" + news_summary + '\'' + ", pic_url='" + pic_url + '\'' + '}'; } } }下边这个布局就不解释了
<?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" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.bwie.yinyulong.OtherActivity"> <ListView android:id="@+id/lv" android:layout_width="match_parent" android:layout_height="match_parent"></ListView> </RelativeLayout>然后是list条目item的布局
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:orientation="horizontal" android:layout_height="match_parent"> <ImageView android:id="@+id/iv_pic" android:src="@mipmap/ic_launcher" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:id="@+id/tv_title" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout>下边是解析的方法 这里要导入谷歌第三方Gson的jar包
然后添加到library里
package com.yinyulong; import android.content.ContentValues; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.Drawable; import android.net.Uri; import android.os.AsyncTask; import android.os.Handler; import android.os.Message; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import com.yinyulong.bean.InfoBean; import com.google.gson.Gson; import java.io.ByteArrayOutputStream; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.util.ArrayList; import java.util.List; public class OtherActivity extends AppCompatActivity { List<InfoBean.DataBean> datas; ListView lv; Myadapter adapter; int code; Handler handler; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_other); lv= (ListView) findViewById(R.id.lv); datas=new ArrayList<InfoBean.DataBean>(); new AsyncTask<String,String,String>(){ @Override protected String doInBackground(String... strings) { String res=initData(); return res; } @Override protected void onPostExecute(String s) { Gson gson=new Gson(); InfoBean info=gson.fromJson(s,InfoBean.class); datas=info.getData(); adapter=new Myadapter(); lv.setAdapter(adapter); super.onPostExecute(s); } }.execute(""); } class Myadapter extends BaseAdapter{ @Override public int getCount() { return datas.size(); } @Override public Object getItem(int i) { return null; } @Override public long getItemId(int i) { return 0; } @Override public View getView(int i, View view, ViewGroup viewGroup) { final ViewHolder holder; if (view==null){ view=View.inflate(OtherActivity.this,R.layout.list_item,null); holder=new ViewHolder(); holder.tv_title=(TextView) view.findViewById(R.id.tv_title); holder.iv_pic=(ImageView) view.findViewById(R.id.iv_pic); view.setTag(holder); }else{ holder= (ViewHolder) view.getTag(); } holder.tv_title.setText(datas.get(i).getNews_title()); final String ss=datas.get(i).getPic_url(); //主线程不能做耗时操作 所以要new一个子线程 new Thread(new Runnable() { @Override public void run() { //定义一个bitmap去得到网络上加载的图片资源 Bitmap bitmap = getHttpBitmap(ss); Message message=new Message(); message.what=0; //绑定在message上发送给handler message.obj=bitmap; //biu 发送 handler.sendMessage(message); } }).start(); Log.i("/*+*+/+/+*/*+/-*+/-*/-*+/+-/-+/*-/+*", "getView: "+ss); //使用handler能更新UI handler=new Handler(){ @Override public void handleMessage(Message msg) { holder.iv_pic.setImageBitmap((Bitmap) msg.obj); super.handleMessage(msg); } }; return view; } } //这个方法传入图片路径 返回一个bitmap对象 public static Bitmap getHttpBitmap(String ss) { URL myFileURL; Bitmap bitmap=null; try { myFileURL=new URL(ss); HttpURLConnection conn= (HttpURLConnection) myFileURL.openConnection(); conn.setConnectTimeout(5000); //想要传流开启一个方法 conn.setDoInput(true); conn.setUseCaches(false); //从conn得到流 InputStream is=conn.getInputStream(); //使用工厂类把流转换为bitmap对象 bitmap= BitmapFactory.decodeStream(is); //关闭流 is.close(); } catch (Exception e) { e.printStackTrace(); } return bitmap; } static class ViewHolder{ //对listview进行优化使用 TextView tv_title; ImageView iv_pic; } public String initData() { String result=""; String path="http://api.expoon.com/AppNews/getNewsList/type/1/p/"; try { URL url=new URL(path); HttpURLConnection conn= (HttpURLConnection) url.openConnection(); //设置请求时间和读取时间 conn.setConnectTimeout(5000); conn.setReadTimeout(5000); conn.setRequestMethod("GET"); code=conn.getResponseCode(); Log.i("++++++++++++++++++++++++++++++++++++++++", "initData: "+code); if (code==200){ //得到流转换为String InputStream is = conn.getInputStream(); ByteArrayOutputStream bos=new ByteArrayOutputStream(); int len=0; byte[] buff=new byte[1024]; while ((len=is.read(buff))!=-1){ bos.write(buff,0,len); } byte[] bytes=bos.toByteArray(); result=new String(bytes); Log.i("********************************************", "initData: "+result); is.close(); } } catch (Exception e) { e.printStackTrace(); } return result; } }最后不要忘了在清单文件中添加网络权限
<uses-permission android:name="android.permission.INTERNET"/> 最后展示一下效果图