这篇文章主要介绍了 Android 编程实现 ListView 滚动提示等待框功能, 结合实例形式分析了 Android ListView 滚动事件相关实现技巧, 需要的朋友可以参考下
Android 是一种基于 Linux 的自由及开放源代码的操作系统,主要使用于移动设备,如智能手机和平板电脑,由 Google 公司和开放手机联盟领导及开发。尚未有统一中文名称,中国大陆地区较多人使用 "安卓" 或 "安致"。
本文实例讲述了 Android 编程实现 ListView 滚动提示等待框功能。分享给大家供大家参考,具体如下:
其实原理很简单,只需要设置监听 listview 的滚动事件即可
file1:
- package cn.stay.activity;
- import java.util.ArrayList;
- import java.util.List;
- import com.aoran.R;
- import android.app.Activity;
- import android.os.Bundle;
- import android.view.View;
- import android.widget.AbsListView;
- import android.widget.AbsListView.OnScrollListener;
- import android.widget.LinearLayout;
- import android.widget.ListView;
- import android.widget.ProgressBar;
- /**
- * @author riddlezhang
- * 滚动listview提示等待框
- */
- public class ListView_sep extends Activity implements OnScrollListener {
- private List<String> list = new ArrayList<String>();
- private ListView listv01;
- private MyAdapter adapter;
- private int current_page = 2;
- ProgressBar progressBar;
- private LinearLayout bottom_linear;
- private int lastItem;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- // TODO Auto-generated method stub
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- listv01 = (ListView) findViewById(R.id.listv01);
- bottom_linear=(LinearLayout) findViewById(R.id.bottom_linear);
- for (int i = 0; i < 100; i++) {
- list.add("i="+i);
- }
- adapter = new MyAdapter(ListView_sep.this, list);
- listv01.setAdapter(adapter);
- // listv01.setSelection(getSingerStrs().size()-1); 设置每次最后一行被选中
- listv01.setOnScrollListener(this);
- }
- @Override
- public void onScrollStateChanged(AbsListView view, int scrollState) {
- if (lastItem==adapter.count && scrollState == OnScrollListener.SCROLL_STATE_IDLE) {
- if ((list.size() - current_page * 10) > 0) {
- bottom_linear.setVisibility(View.VISIBLE);
- if ((list.size() - current_page * 10) >= 10) {
- adapter.count += 10;
- } else {
- adapter.count += (list.size() - current_page * 10);
- }
- current_page++;
- adapter.notifyDataSetChanged();
- // bottom_linear.setVisibility(View.GONE);
- }
- }
- }
- @Override
- public void onScroll(AbsListView view, int firstVisibleItem,
- int visibleItemCount, int totalItemCount) {
- lastItem=firstVisibleItem+visibleItemCount;
- }
- }
file2:
- package cn.stay.activity;
- import java.util.List;
- import com.aoran.R;
- import android.content.Context;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.BaseAdapter;
- import android.widget.TextView;
- public class MyAdapter extends BaseAdapter{
- private Context mContext;
- private List<String> list;
- public int count=20;
- private ViewHolder holder;
- public MyAdapter(Context mContext,List<String> list) {
- this.mContext=mContext;
- this.list=list;
- }
- @Override
- public int getCount() {
- return count;
- }
- @Override
- public Object getItem(int position) {
- // TODO Auto-generated method stub
- return list.get(position);
- }
- @Override
- public long getItemId(int position) {
- return position;
- }
- @Override
- public View getView(int position, View convertView, ViewGroup parent) {
- // TODO Auto-generated method stub
- if(convertView==null || convertView.getTag()==null){
- convertView=LayoutInflater.from(mContext).inflate(R.layout.adapter,null);
- holder = new ViewHolder();
- holder.adapter_tv=(TextView) convertView.findViewById(R.id.adapter_tv);
- convertView.setTag(holder);
- }else{
- holder=(ViewHolder) convertView.getTag();
- }
- holder.adapter_tv.setText(list.get(position));
- return convertView;
- }
- private class ViewHolder{
- private TextView adapter_tv;
- }
- }
file3:
main.xml
- <?xml version="1.0" encoding="utf-8" ?>
- <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"
- android:background="@drawable/project_main_bg">
- <LinearLayout android:id="@+id/bottom_linear" android:layout_alignParentBottom="true"
- android:layout_width="fill_parent" android:layout_height="50dip" android:gravity="center"
- android:visibility="gone">
- <ProgressBar android:layout_width="24dip" android:layout_height="24dip"
- android:layout_marginLeft="20dip" />
- <TextView android:layout_width="fill_parent" android:layout_height="wrap_content"
- android:text="正在加载,请稍后。。。" android:textColor="#FFFFFF" android:textSize="20sp"
- android:gravity="center" />
- </LinearLayout>
- <ListView android:id="@+id/listv01" android:background="@null" android:layout_above="@id/bottom_linear"
- android:layout_width="fill_parent" android:layout_height="wrap_content"
- android:listSelector="#00000000" android:cacheColorHint="#00000000" />
- </RelativeLayout>
希望本文所述对大家 Android 程序设计有所帮助。
来源: http://www.phperz.com/article/17/0329/324027.html