自定义ListView下拉刷新上拉加载更多( 三 ) _生活百科

到这下拉刷新就结束了。
上拉加载更多也是如此
2、上拉加载更多2.1、底部样式<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"android:gravity="center"tools:ignore="MissingDefaultResource"><ProgressBarandroid:id="@+id/footer_prggress"android:layout_width="20dp"android:layout_height="match_parent"style="?android:attr/progressBarStyle"android:layout_marginEnd="10dp"android:indeterminateTint="#E8AD56"/><TextViewandroid:id="@+id/footer_text"android:layout_width="wrap_content"android:layout_height="70dp"android:text="正在加载更多"android:gravity="center"android:textColor="#E8AD56"/></LinearLayout>

文章插图
2.2、布局添加

public void init(Context context) {viewFooter = View.inflate(context, R.layout.view_footer, null);viewFooter.measure(0, 0);footer_text = viewFooter.findViewById(R.id.footer_text);footer_prggress = viewFooter.findViewById(R.id.footer_prggress);heightFooter = viewFooter.getMeasuredHeight();viewFooter.setPadding(0, -heightFooter, 0, 0);this.addFooterView(viewFooter);}

到这里也布局算是添加完毕了，加载更多实现方式不同，我罗列两种

结合OnTouchListener
结合OnScrollListener

方式一这里我先说方式一，因为我们下拉也是用的OnTouchListener,上拉加载也有几种状态，有加载中，还有暂无数据，普遍大家会写，已经到底了~,一直显示在最底部，提示用户没数据了，从而我们控件的上拉事件不可触发状态。

private final int MORE_LOAD_STATE = 10;private final int MORE_LOADING = 11;private final int MORE_NO = 12;//已加载全部数据private int more_current_state = MORE_LOAD_STATE;//当前状态

只有一点需要注意paddFooterY = paddFooterY > heightFooter ? 0 : paddFooterY;来判断不能滑出底部的高度。

@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:downY = (int) event.getY();break;case MotionEvent.ACTION_MOVE:moveY = (int) event.getY();diffY = moveY - downY;//滑动的距离paddFooterY = heightFooter - diffY/3 ;//上拉加载更多if (getLastVisiblePosition() == getCount() - 1 && more_current_state != MORE_NO) {if( more_current_state!=MORE_LOADING){more_current_state = MORE_LOADING;if (iPullDownRefreshService != null) {iPullDownRefreshService.onLoadMore();}}paddFooterY = paddFooterY > heightFooter ? 0 : paddFooterY;viewFooter.setPadding(0,paddFooterY , 0, 0);return true;}break;case MotionEvent.ACTION_UP:break;}return false;}

方式二

public class MyListview extends ListView implements View.OnTouchListener, AbsListView.OnScrollListener{@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {//没有滚动，或者已经用户触摸滚动动画结束if(scrollState == SCROLL_STATE_IDLE || scrollState == SCROLL_STATE_FLING){//最后一个可见if(getLastVisiblePosition() == getCount()-1){viewFooter.setPadding(0,0,0,0);if(iPullDownRefreshService!=null){iPullDownRefreshService.onLoadMore();}}}}@Overridepublic void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {}}

注意：在init方法中添加
public void init(Context context) {setOnTouchListener(this);......this.setOnScrollListener(this);}完工