Android ListView滑动加载

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Java技术网站 → 『 Java开发技术』 → 『 Android技术专题』 → Android ListView滑动加载

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* 贴子主题: Android ListView滑动加载

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作者:sunshine 发表时间：2020-05-15 01:24:17

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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

package com.android.ray.activity;
import android.app.ListActivity;
import android.os.Bundle;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AbsListView.OnScrollListener;
public class MainActivity extends ListActivity implements OnScrollListener {
private ListView listView;
//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
private int scrollState;
//可加载记录的条数
private int count = 100 ;
private int lastItem;
//当前可见页面中的Item总数
private int visibleItemCount;
private Button footerButton;
private LinearLayout footerProgressBarLayout;
private View view;
private ListAdapter mAdapter = new ListAdapter();
public void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
//加载主页面布局
setContentView(R.layout.main);
LayoutInflater inflater = 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( new View.OnClickListener() {
public void onClick(View v) {
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
new Handler().postDelayed( new Runnable() {
public void run() {
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 );
}
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
this .visibleItemCount = visibleItemCount;
lastItem = firstVisibleItem + visibleItemCount - 1 ;
if (mAdapter.count >= count){
listView.removeFooterView(view);
}
// boolean loadMore = firstVisibleItem + visibleItemCount >= totalItemCount;
// if(loadMore){
// mAdapter.count += visibleItemCount;
// mAdapter.notifyDataSetChanged();
// }
}
public void onScrollStateChanged(AbsListView view, int scrollState) {
this .scrollState = scrollState;
}
/**
* 数据匹配器
* @author qin_lei
*
*/
public class ListAdapter extends BaseAdapter{
int count = 10 ;
public int getCount() {
return count;
}
public Object getItem( int position) {
return position;
}
public long getItemId( int position) {
return position;
}
public View getView( int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = LayoutInflater.from(MainActivity. this );
View view = inflater.inflate(R.layout.main_item, null );
TextView tv = (TextView) view.findViewById(R.id.tv);
tv.setText( "Hello " + position);
return view;
}
}
}