ListView学习（一） 滑动分页时底部显示进度条

我们在使用listview时难免会遇到分页的情况，既然是分页，那么能给用户看见分页的情况，无疑让用户在等待下一页数据的时候会有好处的，如果获取下一页时间过久的话，用户会觉得好像死机了，这样就会给用户一个不好的体验，下面我就来实现在listview分页是现实进度条，由于这个效果的要求不高，我只使用了很简单的方式来实现，高手莫笑哦！

 

1、首先便是xml文件

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

     android:id="@+id/main" android:orientation="vertical"

      android:background="@drawable/mainapp_ic_bg" android:layout_width="fill_parent"

     android:layout_height="fill_parent">

     <LinearLayout android:gravity="center_horizontal" android:layout_above="@+id/main_progessbar" android:layout_alignParentTop="true"

         android:orientation="vertical" android:id="@+id/top" android:layout_width="fill_parent"

         android:layout_height="fill_parent">

     <TextView android:text="学习" android:background="@drawable/com_ttb_1l_bg"

         android:id="@+id/main_title"

         android:layout_width="fill_parent" android:gravity="center"

         android:layout_height="wrap_content" android:textSize="18dip"

         android:textColor="@color/white" android:visibility="gone"/>

     <ListView android:id="@+id/main_listview"  android:layout_below="@+id/main_title" android:cacheColorHint="#00000000"

         android:layout_width="fill_parent"  android:layout_height="fill_parent"></ListView>

</LinearLayout>

     <LinearLayout android:gravity="center"    android:layout_alignParentBottom="true"

         android:background="@color/black" android:id="@+id/main_progessbar" android:layout_width="fill_parent"

         android:visibility="gone" android:layout_height="wrap_content" >

         <ProgressBar android:layout_width="wrap_content"

              android:layout_height="wrap_content"></ProgressBar>

         <TextView android:text="加载中..." android:layout_width="wrap_content" 

              android:paddingLeft="10dip" android:gravity="center"  android:layout_height="fill_parent"></TextView>

     </LinearLayout>

</RelativeLayout>

 

2、activity类

public class ListView_ProgressBar extends Activity implements OnScrollListener {

     int lastItem = 0;

     int mProgressStatus = 0;

     private Handler mHandler = new Handler();

     ProgressBar progressBar;

     MyAdapter myAdapter;

     List<String> str = new ArrayList<String>();

     int pageNo = 1;

     ListView listview;

     int totalPage = 10;

     int totalRecord = 200;

     LinearLayout main_progessbarn;

 

     private boolean isScrolling = false;

     int now = 0;

     boolean isPagination = false;

     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         requestWindowFeature(Window.FEATURE_NO_TITLE);

         setContentView(R.layout.main);

         main_progessbarn = (LinearLayout)findViewById(R.id.main_progessbar);

         listview = (ListView) findViewById(R.id.main_listview);

         for (int i = 0; i < 15; i++) {

              str.add("条目内容" + (pageNo-1)*20+i);

         }

         myAdapter = new MyAdapter(ListView_ProgressBar.this, str);

         listview.setAdapter(myAdapter);

         listview.setOnScrollListener(this);               

     }

     public void onScroll(AbsListView v, int firstVisibleItem,

              int visibleItemCount, int totalItemCount) {

             lastItem = firstVisibleItem + visibleItemCount - 1;

             System.out.println("lastItem:" + lastItem);

     }

     public void onScrollStateChanged(AbsListView v, int state) {

         if (lastItem == str.size()-1

                   && state == OnScrollListener.SCROLL_STATE_IDLE) {

              pageNo++;

              if (pageNo <= totalPage) {

                   ccc(pageNo);

              }

         }

     }

     private void ccc(final int pageNo){

         main_progessbarn.setVisibility(View.VISIBLE);

         new Thread() {

              public void run() {

                   getStringList(pageNo);

                   mHandler.post(refreshAdapter);

              }

         }.start();

     }

     private Runnable refreshAdapter = new Runnable() {

         public void run() {

              myAdapter.notifyDataSetChanged();

              main_progessbarn.setVisibility(View.GONE);

         }

     };

     public void getStringList(int pageNo) {

         for (int i = 0; i < 10000; i++) {

              str.add("条目内容" + (pageNo-1)*20+i);

         }

}

}

 

3、listview适配器

public class MyAdapter extends BaseAdapter {

     Context context;

     List<String> list;

     LayoutInflater lif;

     public MyAdapter(Context context, List<String> list,) {

         this.context = context;

         this.list = list;

     }

     public int getCount() {

         if (list != null) {

                   return list.size();

         } else {

              return 0;

         }

     }

     public Object getItem(int position) {

         return null;

     }

     public long getItemId(int position) {

         // mHandler.post(mScrollToButton);//传�?�?��消息进行滚动

         return position;

     }

     public View getView(final int position, View convertView, ViewGroup parent) {

         final MyView mv;

         if (convertView == null) {

              mv = new MyView();

              lif = LayoutInflater.from(context);// 转化到context这个容器

              convertView = lif.inflate(R.layout.main_item, null);// 设置要转化的layout文件

         } else {

              mv = (MyView) convertView.getTag();

         }

         mv.tv1 = (TextView) convertView.findViewById(R.id.main_listview_item);// 取得实例

              System.out.println("条目内容" + list.get(position));

              mv.tv1.setText(list.get(position));

         if ((position % 2) == 0) {

              convertView.setBackgroundResource(R.drawable.com_list_bg_d);

         } else {

              convertView.setBackgroundResource(R.drawable.com_list_bg_s);

         }

         convertView.setTag(mv);

         return convertView;

     }

     private static class MyView {

         TextView tv1;

     }

}