Android ListView实现按钮操作上一条下一条数据功能（ListView根据按钮点击上下滑动）
Android ListView实现按钮操作上一条下一条数据功能（ListView根据按钮点击上下滑动）
listVIew平滑滚动到列表最后一项的效果
listVIew平滑滚动到列表第一项的效果
listVIew实现按钮操作下一条数据滑动效果
listVIew实现按钮操作上一条数据滑动效果
listVIew实现监听滑动距离位置
一.效果图：
二.快速实现：
1.主函数：
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.example.m1571.myapplication.DataSupport;
import com.example.m1571.myapplication.R;
import java.util.ArrayList;
import java.util.List;
/**
* ListView 使用按钮控制列表上下滑动
*/
public class MyListViewActivity extends AppCompatActivity {
ListView listview;
Button btDown,btUp,btBottom,btTop;
List list = new ArrayList<>();
int num = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_list);
listview = (ListView) findViewById(R.id.listview);
btDown = (Button) findViewById(R.id.bt_down);
btUp = (Button) findViewById(R.id.bt_up);
btTop = (Button) findViewById(R.id.bt_top);
btBottom = (Button) findViewById(R.id.bt_bottom);
listview.setAdapter(new ListAdapter());
btDown.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// listview.smoothScrollBy(-20, 10);//这里调整向下滑的速度，向下滑是负数
if(num==list.size()-1){
Toast.makeText(MyListViewActivity.this,"最后一条",Toast.LENGTH_SHORT).show();
return;
}
if(list.size()>0&&list.size()>=5&&num<=list.size()){
num++;
// listview.smoothScrollToPosition(num);
listview.setSelection(num);
}
}
});
btUp.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(num<1){
Toast.makeText(MyListViewActivity.this,"第一条",Toast.LENGTH_SHORT).show();
return;
}
if(list.size()>0&&num>0){
num--;
listview.setSelection(num);
}
}
});
//置顶
btTop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
listview.setSelection(0);
num = 0;
}
});
//到底
btBottom.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int index = listview.getFirstVisiblePosition();
// View v = listview.getChildAt(0);
// int top = (v == null) ? 0 : v.getTop();
// //减慢ListView的滑动速度 原来的 1/10
listview.setFriction(ViewConfiguration.getScrollFriction() * 6);
listview.smoothScrollBy(600,20);
// listview.setSelectionFromTop(listview.getCount()-1, 3500);
//带有滑动动作
listview.smoothScrollToPosition(listview.getCount()-1);//平滑到某个item
// listview.setSelection(listview.getCount()-1);//滑动到某个item
// listview.smoothScrollBy(20, 10);//这里可以调整滑动的速度，向上滑就是正数。
// listview.scrollListBy(600);//向下滑动600px。向上是-600
// listview.smoothScrollBy(600, 2000);//向下平滑1000px，在2s内。向上是-600
num = listview.getCount()-1;//最后一条数据
}
});
listview.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState){
case AbsListView.OnScrollListener.SCROLL_STATE_IDLE: // 没有滚动的时候
System.out.println("最后显示的listview的位置是--->>"
+ listview.getLastVisiblePosition());
if(listview.getLastVisiblePosition()>5){
num = listview.getLastVisiblePosition();
}else {
num = 0;
}
Toast.makeText(MyListViewActivity.this, "滑到了："+listview.getLastVisiblePosition(),
Toast.LENGTH_SHORT).show();
System.out.println("最后显示的getLastVisiblePosition--->>"
+ listview.getLastVisiblePosition());
System.out.println("最后显示的getCount--->>"
+ listview.getCount());
System.out.println("最后显示的getCount-1--->>"
+ (listview.getCount()-1));
if (listview.getLastVisiblePosition() == (listview
.getCount()-1)) {
Toast.makeText(MyListViewActivity.this, "滑到listView底了",
Toast.LENGTH_SHORT).show();
}
break;
case AbsListView.OnScrollListener.SCROLL_STATE_FLING:
break;
case AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
break;
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
}
});
}
class ListAdapter extends BaseAdapter {
private List data;
public ListAdapter() {
list.clear();
data = new DataSupport().getData();
list.addAll(data);
}
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int position) {
return data.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
Holder holder;
if (convertView == null) {
holder = new Holder();
convertView = LayoutInflater.from(MyListViewActivity.this).inflate(R.layout.item_view, parent, false);
holder.textView = (TextView) convertView.findViewById(R.id.tv_content);
holder.tvTime = (TextView) convertView.findViewById(R.id.tv_time);
convertView.setTag(holder);
} else {
holder = (Holder) convertView.getTag();
}
holder.textView.setText(data.get(position));
holder.tvTime.setText((position+1)+".测试：2020年");
return convertView;
}
class Holder {
TextView textView;
TextView tvTime;
}
}
}
2.布局：
3.适配器布局：