編輯:關於Android編程
原文出自:方傑|http://fangjie.sinaapp.com/?p=184 轉載請注明出處
最終效果演示:http://fangjie.sinaapp.com/?page_id=54
該項目代碼已經放到github:https://github.com/JayFang1993/SinaWeibo
一.首先是ListView的adapter。
因為微博列表的Item不是規則的,比如說有些微博有轉發子微博,有些沒有,有些有圖片,有些沒有圖片,所以說很不固定。這裡就采用BaseAdapter,要自己為微博Item設計一個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 Listweibos; 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 //通過View關聯自定義Item布局,進行填充 if(convertView == null) { convertView = View.inflate(context, R.layout.wb_item, null); } System.out.println(position); final Weibo weibo =weibos.get(position); //獲取要顯示的組件,注意findViewById的調用對象是上面填充了Item的布局的對象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); //組件添加內容 tv_content.setText(weibo.getContent()); tv_name.setText(weibo.getUser().getName()); tv_from.setText("來自:"+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的作用就是將List
二.ListView的細節——底部加載更多
首先需要為這個東西寫一個布局文件 load_more.xml,布局很簡單,就是一個button。
然後在HomeActivity.java中為ListView增加一個底部視圖,ListView.addFooterView(View view);
//設置列表底部視圖-加載更多 View loadMoreView = getLayoutInflater().inflate(R.layout.load_more, null); loadMoreButton= (Button) loadMoreView.findViewById(R.id.loadMoreButton); weibolist.addFooterView(loadMoreView);
三.ListView的刷新按鈕
在點擊主界面的刷新按鈕時,會出現progressbar,這些都不是很難。首先寫好一個progress的布局,在刷新任務開始之前然progressbar顯示,任務結束後就View.gone就OK啦,詳細請看源代碼HomeActivity.
四.注意:我在寫ListView的時候,在模擬器測試完全OK,但是在真機上調試時,ListView與上面的TitleBar和TabHost交界處會有陰影。加上這句就可以了。
ListView.setFadingEdgeLength(0);
可能講的不是很直觀,最後附上HomeActivity.java的全部代碼,這個就是Home界面的代碼
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 Listweibos; 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); //設置列表底部視圖-加載更多 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("正在加載,請稍候..."); 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, "親,程序猿還沒寫好呢...", 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中只看到新開一些任務,但是這些任務具體做什麼操縱不清楚,大家可以看看前面的博文,因為有一個 邏輯處理的MainService處理類。針對Task.GET_WEIBOS和Task.LOADMORE,其中的代碼又增加了。這裡也附上MainService.java關於這兩個任務的部分代碼。
//刷新微博 case Task.GET_WEIBOS: { String token=(String)task.getParams().get("token"); WeiboUtil weiboutil=new WeiboUtil(); Listweibos=weiboutil.getWeiboList(token,0); msg.obj=weibos; break; } //加載更多 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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