//代码体现:
packagecom.example.lenovo.myapplication;
importandroid.os.Bundle;
importandroid.os.Handler;
importandroid.support.v7.app.AppCompatActivity;
importandroid.view.LayoutInflater;
importandroid.view.View;
importandroid.widget.AbsListView;
importandroid.widget.Button;
importandroid.widget.ListView;
importandroid.widget.ProgressBar;
importandroid.widget.Toast;
importjava.util.ArrayList;
import staticandroid.R.id.list;
public classMainActivityextendsAppCompatActivityimplementsAbsListView.OnScrollListener {
privateListViewlv_main;
privateButtonfooter_btn;
privateProgressBarfooter_pb;
privateHandlerhandler=newHandler();
privateArrayListlist;
privateAdapteradapter;
//最大显示条目
private static final intMAX_COUNT=20;
privateViewfooterview;
private intlastindex;
@Override
protected voidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private voidinitView() {
lv_main= (ListView) findViewById(R.id.lv_main);
//底布局
footerview= LayoutInflater.from(this).inflate(R.layout.footeritem,null);
footer_btn=footerview.findViewById(R.id.footer_btn);
footer_pb=footerview.findViewById(R.id.footer_pb);
//listview添加底布局
lv_main.addFooterView(footerview);
//设置滑动事件
lv_main.setOnScrollListener(this);
list=newArrayList<>();
for(inti =0; i <10; i++) {
list.add(newCompany("张三"+ i, i +1));
}
adapter=newAdapter(list,this);
lv_main.setAdapter(adapter);
//底布局的监听事件,让按纽隐藏和进度条显示 发送handler消息
footer_btn.setOnClickListener(newView.OnClickListener() {
@Override
public voidonClick(View v) {
footer_btn.setVisibility(View.GONE);
footer_pb.setVisibility(View.VISIBLE);
//发送延时消息,不能用handler.postAttime(); 发送延时消息的时候就让按纽显示,进度条再隐藏
yanshi();
}
});
}
public voidyanshi() {
handler.postDelayed(newRunnable() {//handler.sendmessage();发送即时消息
@Override
public voidrun() {
footer_btn.setVisibility(View.VISIBLE);
footer_pb.setVisibility(View.GONE);
intcount =adapter.getCount();
Toast.makeText(MainActivity.this, count +"", Toast.LENGTH_SHORT).show();
//判断刷新几条和最大条目数比较
if(count +5
for(inti = count; i < count +5; i++) {
list.add(newCompany("李四"+ i, i +1));
}
}else{
for(inti = count; i
list.add(newCompany("李四"+ i, i +1));
}
footer_btn.setVisibility(View.GONE);
}
adapter.notifyDataSetChanged();
//这里count是int值,如果不加空字符串的话,会报资源没有找到的异常
}
},1000);
}
@Override
public voidonScrollStateChanged(AbsListView view,intscrollState) {
/*scrollState有三种状态，分别是SCROLL_STATE_IDLE、SCROLL_STATE_TOUCH_SCROLL、SCROLL_STATE_FLING
SCROLL_STATE_IDLE是当屏幕停止滚动时
SCROLL_STATE_TOUCH_SCROLL是当用户在以触屏方式滚动屏幕并且手指仍然还在屏幕上时（The user is scrolling using touch, and their finger is still on the screen）
SCROLL_STATE_FLING是当用户由于之前划动屏幕并抬起手指，屏幕产生惯性滑动时（The user had previously been scrolling using touch and had performed a fling）
*
*
*
* */
if(scrollState ==SCROLL_STATE_IDLE&&lastindex==adapter.getCount()) {
footer_btn.setVisibility(View.GONE);
footer_pb.setVisibility(View.VISIBLE);
yanshi();
}
}
@Override//自身,第一条显示的条目 ,可显示的条目数,总的条目数
public voidonScroll(AbsListView view,intfirstVisibleItem,intvisibleItemCount,inttotalItemCount) {
lastindex= firstVisibleItem + visibleItemCount -1;
if(totalItemCount ==MAX_COUNT+1) {
lv_main.removeFooterView(footerview);
Toast.makeText(this,"已经到底了", Toast.LENGTH_SHORT).show();
}
}
}
