判断SwipeRefreshLayout的childView是否到达顶部

来源：互联网发布：淘宝闲鱼下载编辑：程序博客网时间：2024/05/18 04:28

重写swipRefreshLayout，实现chidView只有到达顶部的时候，才可以下拉刷新：
使用方法：直接在xml中使用MySwipeRefreshLayout

import android.content.Context;import android.support.v4.view.ViewCompat;import android.support.v4.widget.SwipeRefreshLayout;import android.util.AttributeSet;import android.view.View;import android.widget.AbsListView;/** * Created by Jack on 2017/7/12. */public class MySwipeRefreshLayout extends SwipeRefreshLayout{    //实际需要滑动的child view    private View mScrollUpChild;    public MySwipeRefreshLayout(Context context) {        super(context);    }    public MySwipeRefreshLayout(Context context, AttributeSet attrs) {        super(context, attrs);    }    public void setScrollUpChild(View view) {        mScrollUpChild = view;    }    @Override    public boolean canChildScrollUp() {        if (mScrollUpChild != null) {            if (android.os.Build.VERSION.SDK_INT < 14) {                if (mScrollUpChild instanceof AbsListView) {                    final AbsListView absListView = (AbsListView) mScrollUpChild;                    return absListView.getChildCount() > 0                            && (absListView.getFirstVisiblePosition() > 0 || absListView.getChildAt(0)                            .getTop() < absListView.getPaddingTop());                } else {                    return ViewCompat.canScrollVertically(mScrollUpChild, -1) || mScrollUpChild.getScrollY() > 0;                }            } else {                return ViewCompat.canScrollVertically(mScrollUpChild, -1);            }        }        return super.canChildScrollUp();    }}

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