PHP编程：基于PHP后台的Android新闻浏览客户端

PHP应用
<?php
$con = mysql_connect("localhost","root","123456");
//设置字符集为UTF-8 可解决中文乱码
mysql_query("SET NAMES 'utf8'");
mysql_query("SET CHARACTER SET utf8");
mysql_query("SET CHARACTER_SET_RESULT=utf8");
if(!$con){
die(mysql_error());
}
mysql_select_db("newsdemo",$con);
?>

PHP应用
<?php
/*获得JSON数据
 * 返回值：title desc time content_url pic_url*/ 
 
 require 'mysql_connect.php';
$n = 0;
$result = mysql_query("select * from news");
while($row = mysql_fetch_array($result)){
$arr[$n++] = array(
"title"=>$row['title'],
"desc"=>$row['desc'],
"time"=>$row['time'],
"content_url"=>$row['content_url'],
"pic_url"=>$row['pic_url']
);
}
//数组转化为JSON字符串
echo json_encode($arr);
?>

PHP应用
public class MainActivity extends Activity implements OnItemClickListener{
  private ListView lvNews ;
  private NewsAdapter adapter ;
  //定义集合
  private List<News> newsList ;
  
  //获取json字符串的URL地址
  public static final String GET_NEWS_URL = "http://211.87.234.20/NewsDemo/getNewsJSON.php";
  //获取msg之后如何处理
  private Handler getNewsHandler = new Handler(){
  public void handleMessage(android.os.Message msg){
  String jsonData = (String) msg.obj ;
  System.out.println(jsonData) ;
  try {
JSONArray jsonArray = new JSONArray(jsonData) ;
for(int i=0;i<jsonArray.length();i++){
JSONObject object = jsonArray.getJSONObject(i) ;
String title = object.getString("title") ;
String desc = object.getString("desc") ;
String time = object.getString("time") ;
String content_url = object.getString("content_url") ;
String pic_url = object.getString("pic_url") ;
System.out.println("title="+title) ;
//add一个News类型的Object
newsList.add(new News(title,desc,time,content_url,pic_url)) ;
}
//通知更新
adapter.notifyDataSetChanged() ;
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
  
  } ;
  } ;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState) ;
    setContentView(R.layout.activity_main) ;
    
    lvNews = (ListView) findViewById(R.id.lvNews) ;
    //初始化
    newsList = new ArrayList<News>();  
    adapter = new NewsAdapter(this,newsList) ;
    lvNews.setAdapter(adapter) ;
    lvNews.setOnItemClickListener(this) ;
    
    HttpUtils.getNewsJSON(GET_NEWS_URL,getNewsHandler) ;
  }
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
// TODO Auto-generated method stub
News news = newsList.get(position) ;
Intent intent = new Intent(this,BrowseNewsActivity.class) ;
intent.putExtra("content_url",news.getContent_url()) ;
startActivity(intent) ;
}
  
}

PHP应用
package com.MR.news.utils;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.os.Message;
import android.widget.ImageView;
public class HttpUtils {
//工具类直接定义成静态方法即可
/*url用于内部类中,所以要将其设定为final类型*/
/*读取完成需要通知主线程,需要使用handler*/
public static void getNewsJSON(final String url,final Handler handler){
//访问网络,时间长,开启新线程
new Thread(new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
HttpURLConnection conn ;
InputStream is ;
try {
conn = (HttpURLConnection) new URL(url).openConnection() ;
//GET方式获取
conn.setRequestMethod("GET") ;
//得到输入流
is=conn.getInputStream() ;
//读取数据用缓冲,里面要传入一个reader
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
//一行一行读取数据
String line = "";
//没读完一行进行拼接,高效
StringBuilder result = new StringBuilder();
while((line = reader.readLine()) != null){
result.append(line);
}
Message msg = new Message() ;
//msg.obj可以放进去任何对象
msg.obj = result.toString() ;
handler.sendMessage(msg) ;
} catch (Exception e) {
e.printStackTrace();
}
}}).start() ;
}
public static void setPicBitMap(final ImageView ivPic,final String pic_url){
new Thread(new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
try {
HttpURLConnection conn = (HttpURLConnection) new URL(pic_url).openConnection() ;
conn.connect() ;
InputStream is = conn.getInputStream() ;
//bitmap就是所需图片资源
/*从资源文件中的到图片*/
Bitmap bitmap = BitmapFactory.decodeStream(is) ;
ivPic.setImageBitmap(bitmap) ;
is.close() ;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} 
}
}).start() ;
}
}

PHP应用
package com.MR.news.adapter;
import java.util.List;
import com.MR.news.R;
import com.MR.news.model.News;
import com.MR.news.utils.HttpUtils;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class NewsAdapter extends BaseAdapter {
//声明上下文对象,后面的getView方法需要
private Context context;
private List<News> newsList;
public NewsAdapter(Context context, List<News> newsList){
this.context = context ;
this.newsList = newsList ;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return newsList.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return newsList.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup arg2) {
// TODO Auto-generated method stub
if(convertView == null){
convertView = LayoutInflater.from(context).inflate(R.layout.news_item,null) ;
}
TextView tvTitle = (TextView) convertView.findViewById(R.id.tvTitle) ;
TextView tvDesc = (TextView) convertView.findViewById(R.id.tvDesc) ;
TextView tvTime = (TextView) convertView.findViewById(R.id.tvTime) ;
ImageView ivPic = (ImageView) convertView.findViewById(R.id.ivPic);
News news = newsList.get(position) ;
tvTitle.setText(news.getTitle()) ;
tvDesc.setText(news.getDesc()) ;
tvTime.setText(news.getTime()) ;
String pic_url = news.getPic_url() ;
HttpUtils.setPicBitMap(ivPic, pic_url) ;
return convertView;
}
}

PHP应用
<?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" >
  
  <ImageView 
    android:id="@+id/ivPic"
    android:layout_width="42dp"
    android:layout_height="42dp"
    android:src="@drawable/ic_launcher"
    />
  <TextView
    android:id="@+id/tvTitle"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_toRightOf="@+id/ivPic"
    android:text="title"
    android:textSize="18sp" />
  <TextView
    android:id="@+id/tvDesc"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/tvTitle"
    android:layout_below="@+id/tvTitle"
    android:text="desc"
    android:textSize="18sp" />
  <TextView
    android:id="@+id/tvTime"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:text="time"
    android:textSize="10sp"
    />
</RelativeLayout>