Android-通過網路獲取xml檔案使用pull解析得到伺服器中的資訊（新聞客戶端）
阿新 • • 發佈：2019-01-06
通過網路獲取xml檔案，使用pull解析該檔案得到伺服器中的資訊；
demo中使用了一個開源的圖片載入包，故上傳原始碼方便檢視；
效果圖：
步驟：
1.連線伺服器獲取xml檔案；
2.使用pull解析xml檔案存入實體物件中；
3.解析後將實體物件存入List集合中；
4.使用BaseAdapter,將List集合中中的資料顯示在listview中；
注意許可權的新增；
xml佈局檔案：
item_listview.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <com.loopj.android.image.SmartImageView android:id="@+id/image" android:layout_width="90dp" android:layout_height="70dp" android:layout_alignBottom="@+id/tv_comment" android:layout_alignParentLeft="true" android:layout_margin="5dp" android:layout_alignParentTop="true" android:src="@drawable/ic_launcher" /> <TextView android:id="@+id/tv_title" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_toRightOf="@id/image" android:singleLine="true" android:text="新聞標題" android:textSize="22sp" /> <TextView android:id="@+id/tv_detail" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/tv_title" android:layout_toRightOf="@id/image" android:lines="2" android:text="新聞內容新聞內容新聞內容新聞內容新聞內容" android:textSize="15sp" /> <TextView android:id="@+id/tv_comment" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_below="@id/tv_detail" android:text="13833條評論" android:textColor="#ff0000" /> </RelativeLayout>
activity_main.xml
<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.example.android07.MainActivity" > <ListView android:id="@+id/lisview" android:layout_width="wrap_content" android:layout_height="wrap_content" > </ListView> </RelativeLayout>
java檔案
News.java
package com.example.android07; public class News { private String title; private String detail; private String comment; private String imageUrl; @Override public String toString() { return "News [title=" + title + ", detail=" + detail + ", comment=" + comment + ", imageUrl=" + imageUrl + "]"; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public String getDetail() { return detail; } public void setDetail(String detail) { this.detail = detail; } public String getComment() { return comment; } public void setComment(String comment) { this.comment = comment; } public String getImageUrl() { return imageUrl; } public void setImageUrl(String imageUrl) { this.imageUrl = imageUrl; } }
MainActivity.java
package com.example.android07;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import org.xmlpull.v1.XmlPullParser;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.util.Xml;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import com.loopj.android.image.SmartImageView;
public class MainActivity extends Activity {
List<News> newsList;
ListView listView;
Handler handler;
MyAdapter myAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.lisview);
getNewsInfo();
//建立介面卡例項
myAdapter = new MyAdapter(this);
//建立Handler例項
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
// 要保證在設定介面卡時，新聞xml檔案已經解析完畢了
// 新增介面卡
listView.setAdapter(myAdapter);
}
};
}
class MyAdapter extends BaseAdapter {
Context context;
LayoutInflater inflater;
public MyAdapter(Context context) {
this.context = context;
inflater = LayoutInflater.from(context);
}
@Override
// 得到模型層中元素的數量，用來確定listview需要有多少個條目
public int getCount() {
// TODO Auto-generated method stub
return newsList.size();
}
@Override
// 返回一個View物件，作為listview的條目顯示至介面
public View getView(int position, View convertView, ViewGroup parent) {
News news = newsList.get(position);
ViewHolder viewHolder = null;
if (convertView == null) {
convertView = inflater.inflate(R.layout.item_listview, null);
viewHolder = new ViewHolder();
// 把佈局檔案中所有元件的物件封裝至ViewHolder物件中
viewHolder.St_image = (SmartImageView) convertView
.findViewById(R.id.image);
viewHolder.tv_title = (TextView) convertView
.findViewById(R.id.tv_title);
viewHolder.tv_detail = (TextView) convertView
.findViewById(R.id.tv_detail);
viewHolder.tv_commen = (TextView) convertView
.findViewById(R.id.tv_comment);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
// 給新聞圖片imageview設定內容
viewHolder.St_image.setImageUrl(news.getImageUrl());
// 給三個文字框設定內容
viewHolder.tv_title.setText(news.getTitle());
viewHolder.tv_detail.setText(news.getDetail());
viewHolder.tv_commen.setText(news.getComment());
//返回填充的佈局item_listview
return convertView;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
class ViewHolder {
//條目的佈局檔案中有什麼元件，這裡就定義什麼屬性
private SmartImageView St_image;
private TextView tv_title;
private TextView tv_detail;
private TextView tv_commen;
}
}
private void getNewsInfo() {
Thread thread = new Thread() {
@Override
public void run() {
super.run();
Log.v("tag", "1111111111");
String path = "http://192.168.47.25:8080/mytest/news.xml";
try {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url
.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
conn.setReadTimeout(5000);
// conn.connect();
//傳送http GET請求，獲取相應碼
if (conn.getResponseCode() == 200) {
InputStream is = conn.getInputStream();
//使用pull解析器，解析這個流
parseNewsXml(is);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
thread.start();
}
private void parseNewsXml(InputStream is) {
XmlPullParser xp = Xml.newPullParser();
try {
xp.setInput(is, "utf-8");
//對節點的事件型別進行判斷，就可以知道當前節點是什麼節點
int type = xp.getEventType();
News news = null;
while (type != XmlPullParser.END_DOCUMENT) {
switch (type) {
case XmlPullParser.START_TAG:
if ("newslist".equals(xp.getName())) {
newsList = new ArrayList<>();
} else if ("news".equals(xp.getName())) {
news = new News();
} else if ("title".equals(xp.getName())) {
String title = xp.nextText();
news.setTitle(title);
} else if ("detail".equals(xp.getName())) {
String detail = xp.nextText();
news.setDetail(detail);
} else if ("comment".equals(xp.getName())) {
String comment = xp.nextText();
news.setComment(comment);
} else if ("image".equals(xp.getName())) {
String image = xp.nextText();
news.setImageUrl(image);
}
break;
case XmlPullParser.END_TAG:
if ("news".equals(xp.getName())) {
newsList.add(news);
}
break;
default:
break;
}
//解析完當前節點後，把指標移動至下一個節點，並返回它的事件型別
type = xp.next();
}
// 發訊息，讓主執行緒設定listview的介面卡，如果訊息不需要攜帶資料，可以傳送空訊息
handler.sendEmptyMessage(1);
} catch (Exception e) {
e.printStackTrace();
}
}
}
伺服器端中news.xml的檔案程式碼：
<?xml version="1.0" encoding="UTF-8" ?>
<newslist>
<news>
<title>新聞一</title>
<detail>新聞一內容</detail>
<comment>15687</comment>
<image>http://192.168.47.25:8080/mytest/images/1.jpg</image>
</news>
<news>
<title>新聞二</title>
<detail>新聞二內容</detail>
<comment>16359</comment>
<image>http://192.168.47.25:8080/mytest/images/2.jpg</image>
</news>
<news>
<title>新聞三</title>
<detail>新聞三內容</detail>
<comment>14112</comment>
<image>http://192.168.47.25:8080/mytest/images/3.jpg</image>
</news>
<news>
<title>新聞四</title>
<detail>新聞四內容</detail>
<comment>6427</comment>
<image>http://192.168.47.25:8080/mytest/images/4.jpg</image>
</news>
<news>
<title>新聞五</title>
<detail>新聞五內容</detail>
<comment>681</comment>
<image>http://192.168.47.25:8080/mytest/images/5.jpg</image>
</news>
</newslist>