Android ListView滑动加载

项目结构如图所示：

项目主要包括一个activity和三个xml页面布局，代码如下：

MainActivity.java

                    packagecom.android.ray.activity; 
            
            importandroid.app.ListActivity; 
            importandroid.os.Bundle; 
            importandroid.os.Handler; 
            importandroid.view.LayoutInflater; 
            importandroid.view.View; 
            importandroid.view.ViewGroup; 
            importandroid.widget.AbsListView; 
            importandroid.widget.BaseAdapter; 
            importandroid.widget.Button; 
            importandroid.widget.LinearLayout; 
            importandroid.widget.ListView; 
            importandroid.widget.TextView; 
            importandroid.widget.AbsListView.OnScrollListener; 
            
            publicclassMainActivityextendsListActivityimplementsOnScrollListener{ 
             
            privateListViewlistView; 
            //全局变量，用来记录ScrollView的滚动状态，1表示开始滚动，2表示正在滚动，0表示停止滚动 
            privateintscrollState; 
            //可加载记录的条数 
            privateintcount=100; 
            privateintlastItem; 
            //当前可见页面中的Item总数 
            privateintvisibleItemCount; 
             
            privateButtonfooterButton; 
            privateLinearLayoutfooterProgressBarLayout; 
            privateViewview; 
            privateListAdaptermAdapter=newListAdapter(); 
             
            publicvoidonCreate(BundlesavedInstanceState){ 
            super.onCreate(savedInstanceState); 
            //加载主页面布局 
            setContentView(R.layout.main); 
             
            LayoutInflaterinflater=LayoutInflater.from(this); 
            //加载底部布局 
            view=inflater.inflate(R.layout.main_more,null); 
            footerButton=(Button)view.findViewById(R.id.button); 
            footerProgressBarLayout=(LinearLayout)view.findViewById(R.id.linearlayout); 
            footerProgressBarLayout.setVisibility(View.GONE); 
            //更多按钮点击事件 
            footerButton.setOnClickListener(newView.OnClickListener(){ 
             
            publicvoidonClick(Viewv){ 
            if(lastItem==mAdapter.count&&scrollState==OnScrollListener.SCROLL_STATE_IDLE){ 
            //设置页面底部布局控件可见性 
            footerButton.setVisibility(View.GONE); 
            footerProgressBarLayout.setVisibility(View.VISIBLE); 
            if(mAdapter.count<=count){ 
            //使用Handler动态加载数据 
            newHandler().postDelayed(newRunnable(){ 
             
            publicvoidrun(){ 
            mAdapter.count+=10; 
            mAdapter.notifyDataSetChanged(); 
            listView.setSelection(lastItem-visibleItemCount+1); 
            //获取数据成功设置Layout不可见,Button设为可见 
            footerButton.setVisibility(View.VISIBLE); 
            footerProgressBarLayout.setVisibility(View.GONE); 
            } 
            },2000); 
            } 
            } 
            } 
            }); 
             
            listView=getListView(); 
            //将布局添加到ListView的Footer中 
            listView.addFooterView(view); 
            listView.setAdapter(mAdapter); 
             
            //设置滑动监听 
            listView.setOnScrollListener(this); 
            } 
            
            publicvoidonScroll(AbsListViewview,intfirstVisibleItem, 
            intvisibleItemCount,inttotalItemCount){ 
            this.visibleItemCount=visibleItemCount; 
            lastItem=firstVisibleItem+visibleItemCount-1; 
            if(mAdapter.count>=count){ 
            listView.removeFooterView(view); 
            } 
             
            //booleanloadMore=firstVisibleItem+visibleItemCount>=totalItemCount; 
            //if(loadMore){ 
            //mAdapter.count+=visibleItemCount; 
            //mAdapter.notifyDataSetChanged(); 
            //} 
            } 
            
            publicvoidonScrollStateChanged(AbsListViewview,intscrollState){ 
            this.scrollState=scrollState; 
            } 
             
            /** 
            *数据匹配器 
            *@authorqin_lei 
            * 
            */
            publicclassListAdapterextendsBaseAdapter{ 
            
            intcount=10; 
             
            publicintgetCount(){ 
            returncount; 
            } 
            
            publicObjectgetItem(intposition){ 
            returnposition; 
            } 
            
            publiclonggetItemId(intposition){ 
            returnposition; 
            } 
            
            publicViewgetView(intposition,ViewconvertView,ViewGroupparent){ 
            LayoutInflaterinflater=LayoutInflater.from(MainActivity.this); 
            Viewview=inflater.inflate(R.layout.main_item,null); 
            TextViewtv=(TextView)view.findViewById(R.id.tv); 
            tv.setText("Hello"+position); 
            returnview; 
            } 
            } 
            }

主要布局文件代码如下：

main.xml

                    <?xmlversion="1.0"encoding="utf-8"?>
            <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android" 
            android:orientation="vertical" 
            android:layout_width="fill_parent" 
            android:layout_height="fill_parent"> 
            <ListView 
            android:id="@android:id/list" 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content"/>
            </LinearLayout>

main_more.xml

                    <?xmlversion="1.0"encoding="utf-8"?>
            <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android" 
            android:orientation="vertical" 
            android:layout_width="fill_parent" 
            android:layout_height="fill_parent"> 
            <Button 
            android:id="@+id/button" 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:text="更多"/> 
            <LinearLayout 
            android:orientation="horizontal" 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:gravity="center" 
            android:id="@+id/linearlayout"> 
            <ProgressBar 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content"/> 
            <TextView 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="正在获取..."/> 
            </LinearLayout>
            </LinearLayout>

ListView单个显示item布局main_item.xml

                    <?xmlversion="1.0"encoding="utf-8"?>
            <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android" 
            android:orientation="horizontal" 
            android:layout_width="fill_parent" 
            android:layout_height="fill_parent"> 
            <ImageView 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:scaleType="fitXY" 
            android:src="@drawable/icon_head"/> 
            <TextView 
            android:id="@+id/tv" 
            android:layout_width="fill_parent" 
            android:layout_height="20dp" 
            android:text="@string/hello"/>
            </LinearLayout>

项目运行结果如下图：

点击更多，十条，依次类推：

本文出自 “RayChin” 博客，谢绝转载！

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