android 中listview滑动加载的简单demo

在使用listview时，滑动加载可以提高效率，增加用户体验。

主要用到一个OnScrollListener

   /**         * The view is not scrolling. Note navigating the list using the trackball counts as         * being in the idle state since these transitions are not animated.         */        public static int SCROLL_STATE_IDLE = 0;        /**         * The user is scrolling using touch, and their finger is still on the screen         */        public static int SCROLL_STATE_TOUCH_SCROLL = 1;        /**         * The user had previously been scrolling using touch and had performed a fling. The         * animation is now coasting to a stop         */        public static int SCROLL_STATE_FLING = 2;        /**         * Callback method to be invoked while the list view or grid view is being scrolled. If the         * view is being scrolled, this method will be called before the next frame of the scroll is         * rendered. In particular, it will be called before any calls to         * {@link Adapter#getView(int, View, ViewGroup)}.         *         * @param view The view whose scroll state is being reported         *         * @param scrollState The current scroll state. One of {@link #SCROLL_STATE_IDLE},         * {@link #SCROLL_STATE_TOUCH_SCROLL} or {@link #SCROLL_STATE_IDLE}.         */        public void onScrollStateChanged(AbsListView view, int scrollState);        /**         * Callback method to be invoked when the list or grid has been scrolled. This will be         * called after the scroll has completed         * @param view The view whose scroll state is being reported         * @param firstVisibleItem the index of the first visible cell (ignore if         *        visibleItemCount == 0)         * @param visibleItemCount the number of visible cells         * @param totalItemCount the number of items in the list adaptor         */        public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,                int totalItemCount);

package com.nico.listviewload;import java.util.ArrayList;import java.util.List;import com.nico.bean.MsgInfo;import android.app.Activity;import android.os.AsyncTask;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.BaseAdapter;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.TextView;import android.widget.AbsListView.OnScrollListener;public class MainActivity extends Activity {List<MsgInfo> infoList = null;private LayoutInflater inflater = null;private ListView listview = null;private myAdapter adapter = null;private LinearLayout ftview = null;private Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);switch (msg.what){case 1: adapter.notifyDataSetChanged();try {Thread.sleep(2000l);} catch (InterruptedException e) {e.printStackTrace();}setAdapter();break;}}};/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);inflater = this.getLayoutInflater();listview = (ListView) findViewById(R.id.listview);ftview = (LinearLayout) inflater.inflate(R.layout.ftview, null);listview.addFooterView(ftview, null, false);listview.setAdapter(new myAdapter());adapter = new myAdapter();ftview.setVisibility(View.VISIBLE);listview.setOnScrollListener(new OnScrollListener() {@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {if (scrollState == SCROLL_STATE_IDLE&& view.getLastVisiblePosition() == view.getCount() - 1){handler.sendEmptyMessage(1);}}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {}});}public List<MsgInfo> getList() {List<MsgInfo> infoList = new ArrayList<MsgInfo>();for (int i = 0; i < 7; i++) {MsgInfo info = new MsgInfo();info.id = i;info.detailinfo = "这是第" + i + "条信息";info.name = "第" + i + "项";info.size = 1024 * i;infoList.add(info);}return infoList;}public void setData() {infoList = getList();}public void setAdapter() {for (int i = 0; i < 7; i++) {MsgInfo info = new MsgInfo();info.id = i;info.detailinfo = "这是第" + i + "条信息";info.name = "第" + i + "项";info.size = 1024 * i;infoList.add(info);}adapter.notifyDataSetChanged();}public class myAdapter extends BaseAdapter {@Overridepublic void notifyDataSetChanged() {if(ftview.getVisibility()==View.VISIBLE){ftview.setVisibility(View.GONE);}else if(ftview.getVisibility()==View.GONE){ftview.setVisibility(View.VISIBLE);}super.notifyDataSetChanged();}TextView name, detail, size;public myAdapter() {setData();}@Overridepublic int getCount() {return infoList.size();}@Overridepublic Object getItem(int position) {return infoList.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {if (convertView == null) {convertView = inflater.inflate(R.layout.item, null, false);}name = (TextView) convertView.findViewById(R.id.name);detail = (TextView) convertView.findViewById(R.id.detail);size = (TextView) convertView.findViewById(R.id.size);name.setText(infoList.get(position).name);detail.setText(infoList.get(position).detailinfo);size.setText(infoList.get(position).size + "");return convertView;}}public class LoadAsyTask extends AsyncTask<String, String, String> {@Overrideprotected String doInBackground(String... params) {for (int i = 0; i < 7; i++) {MsgInfo info = new MsgInfo();info.id = i;info.detailinfo = "这是第" + i + "条信息";info.name = "第" + i + "项";info.size = 1024 * i;infoList.add(info);}return null;}@Overrideprotected void onPostExecute(String result) {super.onPostExecute(result);ftview.setVisibility(View.GONE);adapter.notifyDataSetChanged();}}}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent" android:layout_height="match_parent"><LinearLayout android:layout_width="fill_parent" android:gravity="center_horizontal"android:layout_height="wrap_content" android:layout_gravity="center_horizontal"><ImageView android:layout_width="50dip"android:layout_height="50dip" android:src="@drawable/progressbar" android:id="@+id/pbdrawable" /><TextView android:layout_width="wrap_content"android:layout_height="wrap_content" android:text="请稍后..." android:id="@+id/pbtxt" /></LinearLayout></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><rotate xmlns:android="http://schemas.android.com/apk/res/android"android:pivotX="50%" android:pivotY="50%" android:fromDegrees="0"android:toDegrees="360"><shape android:shape="ring" android:innerRadiusRatio="3"android:thicknessRatio="8" android:useLevel="false"><gradient android:type="sweep" android:useLevel="false"android:startColor="#000000" android:centerColor="#FFFFFF"android:centerY="0.50" android:endColor="#000000" /></shape></rotate>

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