Android新浪微博客户端（五）——主界面的TabHost和WeiboUtil
时间：2014-05-18 08:22:30
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原文出自：方杰|http://fangjie.sinaapp.com/?p=183 转载请注明出处
最终效果演示：http://fangjie.sinaapp.com/?page_id=54
该项目代码已经放到github：https://github.com/JayFang1993/SinaWeibo
一.TabHost的实现
之前的一篇文章讲的就是TabHost，但是那个是用Fragment实现TabHost，这里我就尝试用另一种方式，继承TabActivity的方式实现TabHost。
MainActivity.java
public class MainActivity extends TabActivity{
private TabHost tabHost;
private static final String HOME_TAB="home";
private static final String AT_TAB="at";
private static final String MSG_TAB="msg";
private static final String MORE_TAB="more";
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tabHost = this.getTabHost();
TabSpec homeSpec=tabHost.newTabSpec(HOME_TAB).setIndicator(HOME_TAB).setContent(new Intent(this,HomeActivity.class));
TabSpec atSpec=tabHost.newTabSpec(AT_TAB).setIndicator(AT_TAB).setContent(new Intent(this,AtActivity.class));
TabSpec msgSpec=tabHost.newTabSpec(MSG_TAB).setIndicator(MSG_TAB).setContent(new Intent(this,MsgActivity.class));
TabSpec moreSpec=tabHost.newTabSpec(MORE_TAB).setIndicator(MORE_TAB).setContent(new Intent(this,MoreActivity.class));
tabHost.addTab(homeSpec);
tabHost.addTab(atSpec);
tabHost.addTab(msgSpec);
tabHost.addTab(moreSpec);
tabHost.setCurrentTabByTag(HOME_TAB);
RadioGroup radioGroup = (RadioGroup) this.findViewById(R.id.main_radio);
final RadioButton rb=(RadioButton)this.findViewById(R.id.rb_home);
rb.setBackgroundResource(R.drawable.tabhost_press);
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener()
{
public void onCheckedChanged(RadioGroup group, int checkedId)
{
rb.setBackgroundResource(R.drawable.tabhost_bg_selector);
switch (checkedId)
{
case R.id.rb_home:
tabHost.setCurrentTabByTag(HOME_TAB);
break;
case R.id.rb_at:
tabHost.setCurrentTabByTag(AT_TAB);
break;
case R.id.rb_mess:
tabHost.setCurrentTabByTag(MSG_TAB);
break;
case R.id.rb_more:
tabHost.setCurrentTabByTag(MORE_TAB);
break;
default:
break;
}
}
});
}
}
布局文件：main.xml
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@android:id/tabhost"<!--注意这里 -->
android:background="#ffffff"
>
<TabWidget
android:id="@android:id/tabs"<!--注意这里 -->
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:visibility="gone"/>
<FrameLayout
android:id="@android:id/tabcontent"<!--注意这里 -->
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
<RadioGroup
android:id="@+id/main_radio"
android:layout_width="fill_parent"
android:layout_height="48dp"
android:layout_gravity="bottom"
android:orientation="horizontal"
android:background="@drawable/bar" >
<RadioButton
android:id="@+id/rb_home"
android:drawableTop="@drawable/home_icon"
style="@style/rg_style"
android:text="主页" />
<RadioButton
android:id="@+id/rb_at"
android:drawableTop="@drawable/at_icon"
style="@style/rg_style"
android:text="我" />
<RadioButton
android:id="@+id/rb_mess"
android:drawableTop="@drawable/msg_icon"
style="@style/rg_style"
android:text="消息" />
<RadioButton
android:id="@+id/rb_more"
android:drawableTop="@drawable/more_icon"
style="@style/rg_style"
android:text="更多" />
</RadioGroup>
</TabHost>
其中的每一个Tab选项的内容都是一个Activity，然后再去针对性的写每一个Tab下的内容。
二.WeiboAPI WeiboUtil.java
这个类的操作主要是发Http请求，然后解析数据，封装到bean中。这里我只写好了 读取所关注人的微博列表。下面的HttpRequest是我写的一个HTTP请求的方法，因为经常涉及到Http请求，就把这部分代码抽出来写成一个方法。
WeiboUtil.java的全部代码
package com.fangjie.weibo.util;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.fangjie.weibo.bean.User;
import com.fangjie.weibo.bean.Weibo;
public class WeiboUtil {
public List<Weibo> getWeiboList(String token, long i) {
List<Weibo> weibos=new ArrayList<Weibo>();
String url="https://api.weibo.com/2/statuses/home_timeline.json";
String params="access_token="+token+"&max_id="+i;
String result=HttpRequest(1, url, params);
try {
JSONObject json_res=new JSONObject(result);
JSONArray json_weibos=json_res.getJSONArray("statuses");
for(int j=0;j<json_weibos.length();j++)
{
Weibo weibo=new Weibo();
JSONObject json_weibo=json_weibos.getJSONObject(j);
weibo.setComments_count(json_weibo.getInt("comments_count"));
weibo.setContent(json_weibo.getString("text"));
weibo.setFrom(json_weibo.getString("source"));
weibo.setReposts_count(json_weibo.getInt("reposts_count"));
weibo.setTime(json_weibo.getString("created_at"));
weibo.setWid(json_weibo.getLong("id"));
User user=new User();
JSONObject json_user=json_weibo.getJSONObject("user");
user.setUid(json_user.getLong("id"));
user.setName(json_user.getString("screen_name"));
user.setProfile_image_url(json_user.getString("profile_image_url"));
user.setIsv(json_user.getBoolean("verified"));
weibo.setUser(user);
if(!json_weibo.isNull("thumbnail_pic"))
weibo.setBmiddle_pic(json_weibo.getString("thumbnail_pic"));
else
weibo.setBmiddle_pic("");
if(!json_weibo.isNull("retweeted_status"))
{
Weibo zweibo=new Weibo();
JSONObject json_zweibo=json_weibo.getJSONObject("retweeted_status");
zweibo.setComments_count(json_zweibo.getInt("comments_count"));
zweibo.setContent(json_zweibo.getString("text"));
zweibo.setFrom(json_zweibo.getString("source"));
zweibo.setReposts_count(json_zweibo.getInt("reposts_count"));
zweibo.setTime(json_zweibo.getString("created_at"));
zweibo.setWid(json_zweibo.getLong("id"));
User zuser=new User();
JSONObject json_zuser=json_zweibo.getJSONObject("user");
zuser.setUid(json_zuser.getLong("id"));
zuser.setName(json_zuser.getString("screen_name"));
zuser.setProfile_image_url(json_zuser.getString("profile_image_url"));
zuser.setIsv(json_zuser.getBoolean("verified"));
zweibo.setUser(zuser);
if(!json_zweibo.isNull("thumbnail_pic"))
zweibo.setBmiddle_pic(json_zweibo.getString("thumbnail_pic"));
else
zweibo.setBmiddle_pic("");
weibo.setWeibo(zweibo);
}
else
{
weibo.setWeibo(null);
}
weibos.add(weibo);
System.out.println(weibo.content);
}
} catch (JSONException e) {
e.printStackTrace();
}
return weibos;
}
//HTTP请求 way-0 Post way-1 Get
public static String HttpRequest(int way,String url,String params)
{
String result = "";
BufferedReader in = null;
PrintWriter out = null;
try {
String urlNameString = url + "?" + params;
System.out.println(urlNameString);
URL realUrl = new URL(urlNameString);
URLConnection connection;
if(way==0)
{
// 打开和URL之间的连接
connection= realUrl.openConnection();
// 发送POST请求必须设置如下两行
connection.setDoOutput(true);
connection.setDoInput(true);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(connection.getOutputStream());
// 发送请求参数
out.print(params);
// flush输出流的缓冲
out.flush();
}
else
{
// 打开和URL之间的连接
connection = realUrl.openConnection();
// 设置通用的请求属性
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 建立实际的连接
//connection.connect();
}
// 定义 BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送GET请求出现异常！" + e);
e.printStackTrace();
}
// 使用finally块来关闭输入流
finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
return result;
}
}
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