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Android使用ListView实现下拉刷新及上拉显示更多的方法
时间:2022-06-25 23:29:14 编辑:袖梨 来源:一聚教程网
今天得需求是做listview+上下拉动在header和footer显示progressdialog,但不影响用户操作
直接上代码,我已经加上注释了,自己看。
代码如下 | 复制代码 |
packagecom.stay.main; importjava.net.HttpURLConnection; importjava.util.ArrayList; importjava.util.HashMap; importorg.json.JSONObject; importandroid.app.Activity; importandroid.app.ProgressDialog; importandroid.graphics.drawable.Drawable; importandroid.os.Bundle; importandroid.os.Handler; importandroid.os.HandlerThread; importandroid.os.Looper; importandroid.os.Message; importandroid.view.LayoutInflater; importandroid.view.View; importandroid.widget.AbsListView; importandroid.widget.AbsListView.OnScrollListener; importandroid.widget.Button; importandroid.widget.LinearLayout; importandroid.widget.ListView; importandroid.widget.RelativeLayout; importandroid.widget.TextView; importcom.stay.wifi.R; /** * @author Stay * 动态加载listview数据,上拉 刷新,下拉 更多 */ publicclassListViewActivityextendsActivityimplementsOnScrollListener { privatestaticfinalintLOAD =0; privatestaticfinalintERROR =0; privatestaticfinalintMEMBER =1; privatestaticfinalintLOADED =2; privatestaticfinalintDIALOG =3; privatestaticfinalintFULL =4; privateNearbyAdapter adapter; privateListView nearby_lv; privateRelativeLayout nearby_lv_header; privateButton list_bottom_btn; privateLinearLayout list_bottom_linear; privateTextView bottom_progress_text; privateRelativeLayout nearby_lv_footer; privateButton list_header_btn; privateLinearLayout list_header_linear; privateTextView heard_progress_text; privateArrayList privateintlastItem; privateHashMap privatecom.stay.main.ListViewActivity.MyHandler myHandler; privateProgressDialog dialog; privateintcurPage =1; privatebooleanisMember =false; privateintfirstItem; publicintcount; /** Called when the activity is first created. */ @Override publicvoidonCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initView(); myHandler.sendEmptyMessage(LOAD); } @Override publicvoidonScrollStateChanged(AbsListView view,intscrollState) { DebugUtil.debug("onScrollStateChanged"); //当滚动停止且滚动的总数等于数据的总数,去加载 if(lastItem == count && scrollState == SCROLL_STATE_IDLE) { DebugUtil.debug("onScrollStateChanged--------next"); if(curPage ==4&& !isMember) { DebugUtil.show(this,"您不是正式会员,请申请正式会员,"); list_bottom_linear.setVisibility(View.GONE); }else{ //加载数据 myHandler.sendEmptyMessage(LOAD); } return; } //当往上拉时更新数据,将data清空然后去重新加载 if(firstItem ==0&& scrollState == SCROLL_STATE_IDLE) { DebugUtil.debug("onScrollStateChanged--------refresh"); curPage =0; myHandler.sendEmptyMessage(LOAD); } } @Override publicvoidonScroll(AbsListView view,intfirstVisibleItem,intvisibleItemCount,inttotalItemCount) { DebugUtil.debug("firstVisibleItem="+ firstVisibleItem); DebugUtil.debug("visibleItemCount="+ visibleItemCount); DebugUtil.debug("totalItemCount="+ totalItemCount); //这里要减二,因为我加了header footer lastItem = firstVisibleItem + visibleItemCount -2; firstItem = firstVisibleItem; } publicintgetData() { try{ HttpURLConnection conn = DownloadUtil.download(url//自己写咯); ArrayList if(curPage ==0&& nearby_data.size() >0) { nearby_data.clear(); count =0; } if(temp !=null&& temp.size() >0) { count += temp.size(); nearby_data.addAll(temp); DebugUtil.debug("nearby_data.size()="+nearby_data.size()); }else{ returnFULL; } returnLOADED; }catch(Exception e) { returnERROR; } } privateHandler handler =newHandler() { @Override publicvoidhandleMessage(Message msg) { super.handleMessage(msg); switch(msg.what) { caseDIALOG: list_bottom_linear.setVisibility(View.VISIBLE); list_header_linear.setVisibility(View.VISIBLE); break; caseLOADED: list_bottom_linear.setVisibility(View.GONE); list_header_linear.setVisibility(View.GONE); curPage++; adapter.notifyDataSetChanged(); break; caseERROR: DebugUtil.debug("error,missing data"); break; caseMEMBER: DebugUtil.debug("you must regist formal member"); break; default: break; } } }; //创建子线程加载数据,然后更新 privateclassMyHandlerextendsHandler { privateintstatus; publicMyHandler(Looper looper) { super(looper); } @Override publicvoidhandleMessage(Message msg) { synchronized(this) { switch(msg.what) { caseLOAD:// get data from server handler.sendEmptyMessage(DIALOG);//显示等待框 status = getData(); handler.sendEmptyMessageDelayed(status,1000); break; default: break; } } } } publicvoidinitView() { imageCache =newHashMap HandlerThread handlerThread =newHandlerThread("nearby"); // 在使用HandlerThread的getLooper()方法之前,必须先调用该类的start(); handlerThread.start(); myHandler =newMyHandler(handlerThread.getLooper()); nearby_lv = (ListView) findViewById(R.id.nearby_lv); nearby_lv_footer = (RelativeLayout) LayoutInflater.from(ListViewActivity.this).inflate(R.layout.nearby_lv_header,null); list_bottom_btn = (Button) nearby_lv_footer.findViewById(R.id.list_bottom_btn); list_bottom_linear = (LinearLayout) nearby_lv_footer.findViewById(R.id.list_bottom_linear); bottom_progress_text = (TextView) nearby_lv_footer.findViewById(R.id.progress_text); nearby_lv_header = (RelativeLayout) LayoutInflater.from(ListViewActivity.this).inflate(R.layout.nearby_lv_header,null); list_header_btn = (Button) nearby_lv_header.findViewById(R.id.list_bottom_btn); list_header_linear = (LinearLayout) nearby_lv_header.findViewById(R.id.list_bottom_linear); heard_progress_text = (TextView) nearby_lv_header.findViewById(R.id.progress_text); list_header_btn.setText("刷新"); list_bottom_btn.setText("更多"); list_header_linear.setVisibility(View.GONE); nearby_lv.addHeaderView(nearby_lv_header); nearby_lv.addFooterView(nearby_lv_footer); // list_header_btn.setOnClickListener(header_click); adapter =newNearbyAdapter(ListViewActivity.this, nearby_data); nearby_lv.setAdapter(adapter); nearby_lv.setOnScrollListener(ListViewActivity.this); } } |
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