具体步骤如下：
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1 布局文件中控件的设计
2 访问远程服务器的资源xml文件，该文件包含新闻的内容等信息
3 访问到内容后把访问内容显示到页面上
具体代码如下：
1 MainActivity
package com.yuanlp.newsclient;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.yuanlp.newsclient.bean.NewsBean;
import com.yuanlp.newsclient.utils.XMLToBean;
import com.yuanlp.newsclient.view.SmartImageView;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private static final int LOAD_ERROR =2 ;
private static final int LOAD_SUCCESS =1 ;
private ListView mLv_news;
private LinearLayout mLoading;
//new 一个Handler来做android的消息机制，处理子线程数据
private Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
//不管加载成功失败，进度条应该隐藏
mLoading.setVisibility(View.INVISIBLE);
switch (msg.what){
case LOAD_ERROR:
Toast.makeText(MainActivity.this, "加载失败", Toast.LENGTH_SHORT).show();
break;
case LOAD_SUCCESS:
//显示listView的内容
mLv_news.setAdapter(new MyNewsAdapter());
break;
}
}
};
private List mList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/**
* 初始化获取界面元素
*/
initView();
/**
* 加载远程资源到本地文件
*/
loadMessage();
//readMessage();
}
/**
* 初始化界面
*/
private void initView() {
setContentView(R.layout.activity_main);
mLv_news = (ListView) findViewById(R.id.lv_news);
mLoading = (LinearLayout) findViewById(R.id.ll_loading);
//打开客户端后，设置ll_loading可见
mLoading.setVisibility(View.VISIBLE);
}
/**
* 加载远程资源到本地
*/
private void loadMessage() {
NewsBean newsBean=null;
//访问网络不能再主线程中进行，需要一个新线程
new Thread(){
@Override
public void run() {
try {
Thread.sleep(5000);
NewsBean newsBean=null;
URL url = new URL("http://192.168.1.107:8080/WebServer/news.xml");
HttpURLConnection conn= (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
int code = conn.getResponseCode();
if (code==200){
//获取到资源
InputStream is = conn.getInputStream();
//调用utils方法，将xml文件转为list类型返回
mList = XMLToBean.readStream(newsBean,is);
//利用android的循环消息机制，放到UI线程中执行结果
Message msg = Message.obtain();
msg.what=LOAD_SUCCESS;
handler.sendMessage(msg);
}else{
Message msg = Message.obtain();
msg.what=LOAD_ERROR;
handler.sendMessage(msg);
}
} catch (Exception e) {
e.printStackTrace();
Message msg = Message.obtain();
msg.what=LOAD_ERROR;
handler.sendMessage(msg);
}
}
}.start();
}
/**
* 显示listView中的数据
*/
private class MyNewsAdapter extends BaseAdapter {
@Override
public int getCount() {
return mList.size();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//布局打气筒，把xml资源文件转变为view 即加载另外的一个布局文件
View view = View.inflate(MainActivity.this, R.layout.news, null);
//获取子布局文件中的各个控件
SmartImageView img = (SmartImageView) view.findViewById(R.id.iv_img);
TextView tv_title= (TextView) view.findViewById(R.id.tv_title);
TextView tv_desc= (TextView) view.findViewById(R.id.tv_desc);
TextView tv_type= (TextView) view.findViewById(R.id.tv_type);
//获取当前位置的对象
NewsBean item = getItem(position);
//设置图片显示
img.showImgByPath(item.getImg());
tv_title.setText(item.getTitle());
tv_desc.setText(item.getDescription());
String type=item.getType();
if ("1".equals(type)){ //当类型为1时，表示有评论，而且显示评论数
tv_type.setText("评论:"+item.getComment());
tv_type.setTextColor(Color.BLACK);
tv_type.setBackgroundColor(Color.TRANSPARENT);
}else if ("2".equals(type)){
tv_type.setText("专题");
tv_type.setBackgroundColor(Color.RED);
tv_type.setTextColor(Color.WHITE);
}else if ("3".equals(type)){
tv_type.setText("直播");
tv_type.setBackgroundColor(Color.RED);
tv_type.setTextColor(Color.WHITE);
}
return view;
}
@Override
public NewsBean getItem(int position) {
return mList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
}
}
2 utils 中的将xml转为list，可以参考前面几天写的博客，android解析xml。
package com.yuanlp.newsclient.utils;
import android.util.Xml;
import com.yuanlp.newsclient.bean.NewsBean;
import org.xmlpull.v1.XmlPullParser;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
/**
* Created by 原立鹏 on 2017/6/21.
*/
public class XMLToBean {
public static List readStream(NewsBean newsBean, InputStream is){
List list=null;
try {
XmlPullParser xmlPullParser = Xml.newPullParser();
xmlPullParser.setInput(is,"utf-8");
int event=xmlPullParser.getEventType();
while(event!=XmlPullParser.END_DOCUMENT){
switch (event){ //根据eventType来区分，分为START_DOCUMENT,START_TAG,END_TAG,END_DOCUMENT
case XmlPullParser.START_DOCUMENT:
list=new ArrayList();
break;
case XmlPullParser.START_TAG:
String tagName=xmlPullParser.getName(); //获取标签名称
if (tagName.equalsIgnoreCase("item")){
newsBean=new NewsBean();
}else if (tagName.equalsIgnoreCase("title")){
newsBean.setTitle(xmlPullParser.nextText());
}else if (tagName.equalsIgnoreCase("description")){
newsBean.setDescription(xmlPullParser.nextText());
}else if (tagName.equalsIgnoreCase("p_w_picpath")){
newsBean.setImg(xmlPullParser.nextText());
}else if (tagName.equalsIgnoreCase("type")){
newsBean.setType(xmlPullParser.nextText());
}else if (tagName.equalsIgnoreCase("comment")){
newsBean.setComment(xmlPullParser.nextText());
}
break;
case XmlPullParser.END_TAG:
if (xmlPullParser.getName().equalsIgnoreCase("item")&&newsBean!=null){
list.add(newsBean);
newsBean=null;
}
}
event=xmlPullParser.next();
}
} catch (Exception e) {
e.printStackTrace();
}
return list;
}
}
3 获取远程新闻的方法
package com.yuanlp.newsclient.view;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.widget.ImageView;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
/**
* Created by 原立鹏 on 2017/6/21.
*/
/**
* 根据url地址去获取远程图片，并显示到新闻标题的左侧
*/
public class SmartImageView extends ImageView {
private Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
Bitmap bitmap= (Bitmap) msg.obj;
setImageBitmap(bitmap);
}
};
public SmartImageView(Context context) {
super(context);
}
public SmartImageView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public SmartImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public void showImgByPath(final String imgURL){
new Thread(){
@Override
public void run() {
try {
URL url = new URL(imgURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
int code = conn.getResponseCode();
if (code==200){
InputStream is = conn.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(is);
Message msg = Message.obtain();
msg.what=1;
msg.obj=bitmap;
handler.sendMessage(msg);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();
}
}
4 activity_main.xml
5 news.xml
文章题目：android消息机制与仿新闻客户端
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