Android新浪微博客户端（六）——Home界面的ListView
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Android新浪微博客户端（六）——Home界面的ListView
原文出自：方杰|http://fangjie.sinaapp.com/?p=184 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.首先是ListView的adapter。
因为微博列表的Item不是规则的，比如说有些微博有转发子微博，有些没有，有些有图片，有些没有图片，所以说很不固定。这里就采用BaseAdapter，要自己为微博Item设计一个WeiboAdapter.java
package com.fangjie.weibo.ui;
import java.util.Date;
import java.util.List;
import com.fangjie.weibo.R;
import com.fangjie.weibo.bean.Weibo;
import android.content.Context;
import android.graphics.Bitmap;
import android.support.v4.util.LruCache;
import android.text.Html;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
public class WeiboAdapter extends BaseAdapter {
private Context context;
private List weibos;
public WeiboAdapter(Context context,List weibos) {
System.out.println(weibos.get(1).content);
this.context=context;
this.weibos=weibos;
}
public int getCount() {
return weibos.size();
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
//position代表位置
//通过View关联自定义Item布局，进行填充
if(convertView == null)
{
convertView = View.inflate(context, R.layout.wb_item, null);
}
System.out.println(position);
final Weibo weibo =weibos.get(position);
//获取要显示的组件,注意findViewById的调用对象是上面填充了Item的布局的对象View
TextView tv_name = (TextView)convertView.findViewById(R.id.txt_wb_item_uname);
TextView tv_content = (TextView)convertView.findViewById(R.id.txt_wb_item_content);
TextView tv_time =(TextView)convertView.findViewById(R.id.txt_wb_item_time);
TextView tv_from =(TextView)convertView.findViewById(R.id.txt_wb_item_from);
TextView tv_comment =(TextView)convertView.findViewById(R.id.txt_wb_item_comment);
TextView tv_repost =(TextView)convertView.findViewById(R.id.txt_wb_item_redirect);
LinearLayout zlayout=(LinearLayout)convertView.findViewById(R.id.lyt_wb_item_sublayout);
TextView tv_zcontent=(TextView)convertView.findViewById(R.id.txt_wb_item_subcontent);
final ImageView iv_userhead=(ImageView)convertView.findViewById(R.id.img_wb_item_head);
ImageView iv_isv=(ImageView)convertView.findViewById(R.id.img_wb_item_V);
ImageView iv_content_pic=(ImageView)convertView.findViewById(R.id.img_wb_item_content_pic);
ImageView iv_zcontent_pic=(ImageView)convertView.findViewById(R.id.img_wb_item_content_subpic);
//组件添加内容
tv_content.setText(weibo.getContent());
tv_name.setText(weibo.getUser().getName());
tv_from.setText("来自:"+Html.fromHtml(weibo.getFrom()));
tv_repost.setText(weibo.getReposts_count()+"");
tv_comment.setText(weibo.getComments_count()+"");
tv_time.setText(dealTime(weibo.getTime()));
loadBitmap(weibo.getUser().getProfile_image_url(), iv_userhead,80,80);
if(!weibo.getBmiddle_pic().equals(""))
{
loadBitmap(weibo.getBmiddle_pic(), iv_content_pic,0,0);
iv_content_pic.setVisibility(View.VISIBLE);
}
else
{
iv_content_pic.setVisibility(View.GONE);
}
if(weibo.getUser().isIsv())
iv_isv.setVisibility(View.VISIBLE);
else
iv_isv.setVisibility(View.GONE);
if(weibo.getWeibo()!=null)
{
zlayout.setVisibility(View.VISIBLE);
tv_zcontent.setText("@"+weibo.getWeibo().getUser().getName()+":"+weibo.getWeibo().getContent());
if(!weibo.getWeibo().getBmiddle_pic().equals(""))
{
loadBitmap(weibo.getWeibo().getBmiddle_pic(), iv_zcontent_pic,0,0);
iv_zcontent_pic.setVisibility(View.VISIBLE);
}
}
else
zlayout.setVisibility(View.GONE);
return convertView;
}
public void addItem(Weibo weibo)
{
weibos.add(weibo);
}
}
微博Item的布局文件 wb_item.xml
WeiboAdapter的作用就是将List
二.ListView的细节——底部加载更多
首先需要为这个东西写一个布局文件 load_more.xml，布局很简单，就是一个button。
然后在HomeActivity.java中为ListView增加一个底部视图，ListView.addFooterView(View view);
//设置列表底部视图-加载更多
View loadMoreView = getLayoutInflater().inflate(R.layout.load_more, null);
loadMoreButton= (Button) loadMoreView.findViewById(R.id.loadMoreButton);
weibolist.addFooterView(loadMoreView);
三.ListView的刷新按钮
在点击主界面的刷新按钮时，会出现progressbar，这些都不是很难。首先写好一个progress的布局，在刷新任务开始之前然progressbar显示，任务结束后就View.gone就OK啦，详细请看源代码HomeActivity.
四.注意：我在写ListView的时候，在模拟器测试完全OK，但是在真机上调试时，ListView与上面的TitleBar和TabHost交界处会有阴影。加上这句就可以了。
ListView.setFadingEdgeLength(0);
可能讲的不是很直观，最后附上HomeActivity.java的全部代码，这个就是Home界面的代码
package com.fangjie.weibo.ui;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.fangjie.weibo.R;
import com.fangjie.weibo.bean.Task;
import com.fangjie.weibo.bean.Weibo;
import com.fangjie.weibo.logic.MainService;
import com.fangjie.weibo.util.SharePreferencesUtil;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class HomeActivity extends Activity implements IWeiboAcitivity {
private ListView weibolist;
private List weibos;
private WeiboAdapter adapter;
private TextView tv_title;
private Button btn_refresh;
private Button btn_update;
private LinearLayout progress;
private Button loadMoreButton;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.home);
init();
}
public void init() {
weibolist=(ListView)findViewById(R.id.lv_weibos);
tv_title=(TextView)findViewById(R.id.txt_wb_title);
btn_refresh=(Button)findViewById(R.id.btn_refresh);
btn_update=(Button)findViewById(R.id.btn_writer);
progress=(LinearLayout)findViewById(R.id.layout_progress);
//设置列表底部视图-加载更多
View loadMoreView = getLayoutInflater().inflate(R.layout.load_more, null);
loadMoreButton= (Button) loadMoreView.findViewById(R.id.loadMoreButton);
weibolist.addFooterView(loadMoreView);
weibolist.setFadingEdgeLength(0);
final String token=SharePreferencesUtil.getLoginUser(HomeActivity.this).getToken();
tv_title.setText(SharePreferencesUtil.getLoginUser(HomeActivity.this).getUserName());
Map params=new HashMap();
params.put("token", token);
Task task=new Task(Task.GET_WEIBOS, params);
progress.setVisibility(View.VISIBLE);
MainService.newTask(task);
MainService.addActivty(HomeActivity.this);
loadMoreButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Map params=new HashMap();
params.put("token", token);
params.put("max_id", weibos.get(weibos.size()-1).getWid());
loadMoreButton.setText("正在加载，请稍候...");
Task task=new Task(Task.LOADMORE, params);
MainService.newTask(task);
MainService.addActivty(HomeActivity.this);
}
});
btn_refresh.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Map params=new HashMap();
params.put("token", token);
progress.setVisibility(View.VISIBLE);
Task task=new Task(Task.GET_WEIBOS, params);
MainService.newTask(task);
MainService.addActivty(HomeActivity.this);
}
});
btn_update.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Toast.makeText(HomeActivity.this, "亲，程序猿还没写好呢...", Toast.LENGTH_LONG).show();
}
});
}
@SuppressWarnings("unchecked")
public void refresh(int taskID, Object... objects) {
switch (taskID)
{
case Task.GET_WEIBOS:
weibos=(List)objects[0];
adapter=new WeiboAdapter(HomeActivity.this,weibos);
weibolist.setAdapter(adapter);
break;
case Task.LOADMORE:
weibos=(List)objects[0];
for(int i=1;i
可能大家在HomeActivity中只看到新开一些任务，但是这些任务具体做什么操纵不清楚，大家可以看看前面的博文，因为有一个 逻辑处理的MainService处理类。针对Task.GET_WEIBOS和Task.LOADMORE，其中的代码又增加了。这里也附上MainService.java关于这两个任务的部分代码。
//刷新微博
case Task.GET_WEIBOS:
{
String token=(String)task.getParams().get("token");
WeiboUtil weiboutil=new WeiboUtil();
List weibos=weiboutil.getWeiboList(token,0);
msg.obj=weibos;
break;
}
//加载更多
case Task.LOADMORE:
{
String token=(String)task.getParams().get("token");
long max_id=(Long) task.getParams().get("max_id");
WeiboUtil weiboutil=new WeiboUtil();
List weibos=weiboutil.getWeiboList(token,max_id);
msg.obj=weibos;
break;
}
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