package com.lcjian.library.util;
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import android.content.Context;
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import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
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import android.util.AttributeSet;
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import android.util.Log;
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import android.view.LayoutInflater;
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import android.view.MotionEvent;
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import android.view.View;
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import android.view.ViewConfiguration;
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import android.widget.AbsListView;
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import android.widget.ListView;
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import com.lcjian.lcjianlibrary.R;
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/**
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* Created by Administrator on 2016/6/23.
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*/
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public class RefreshLayout extends SwipeRefreshLayout implements AbsListView.OnScrollListener {
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/**
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* 滑动到最下面时的上拉操作
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*/
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private int mTouchSlop;
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/**
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* listview实例
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*/
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private ListView mListView;
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/**
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* 上拉监听器, 到了最底部的上拉加载操作
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*/
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private OnLoadListener mOnLoadListener;
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/**
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* ListView的加载中footer
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*/
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private View mListViewFooter;
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/**
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* 按下时的y坐标
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*/
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private int mYDown;
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/**
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* 抬起时的y坐标, 与mYDown一起用于滑动到底部时判断是上拉还是下拉
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*/
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private int mLastY;
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/**
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* 是否在加载中 ( 上拉加载更多 )
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*/
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private boolean isLoading = false;
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private Context mContext;
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/**
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* @param context
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*/
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public RefreshLayout(Context context) {
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this(context, null);
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mContext = context;
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}
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public RefreshLayout(Context context, AttributeSet attrs) {
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super(context, attrs);
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mContext = context;
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mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
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mListViewFooter = LayoutInflater.from(context).inflate(R.layout.listview_footer, null,
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false);
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}
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public void setFooter(View view) {
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if (view != null)
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mListViewFooter = view;
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}
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@Override
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protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
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super.onLayout(changed, left, top
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, right, bottom);
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// Log.i("result","changed:"+changed);
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// Log.i("result","left:"+left);
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// Log.i("result","top:"+top);
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// Log.i("result","right:"+right);
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// Log.i("result","bottom:"+bottom);
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// 初始化ListView对象
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if (mListView == null) {
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getListView();
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}
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}
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/**
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* 获取ListView对象
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*/
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private void getListView() {
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int childs = getChildCount();
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if (childs > 0) {
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View childView = getChildAt(0);
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if (childView instanceof ListView) {
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mListView = (ListView) childView;
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// 设置滚动监听器给ListView, 使得滚动的情况下也可以自动加载
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mListView.setOnScrollListener(this);
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Log.d(VIEW_LOG_TAG, "### 找到listview");
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}
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}
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}
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/*
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* (non-Javadoc)
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* @see android.view.ViewGroup#dispatchTouchEvent(android.view.MotionEvent)
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*/
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@Override
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public boolean dispatchTouchEvent(MotionEvent event) {
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final int action = event.getAction();
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switch (action) {
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case MotionEvent.ACTION_DOWN:
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// 按下
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mYDown = (int) event.getRawY();
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break;
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case MotionEvent.ACTION_MOVE:
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// 移动
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mLastY = (int) event.getRawY();
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break;
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case MotionEvent.ACTION_UP:
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// 抬起
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if (canLoad()) {
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loadData();
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}
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break;
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default:
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break;
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}
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try {
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return super.dispatchTouchEvent(event);
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} catch (Exception e) {
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return false;
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}
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}
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/**
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* 是否可以加载更多, 条件是到了最底部, listview不在加载中, 且为上拉操作.
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*
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* @return
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*/
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private boolean canLoad() {
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return isBottom() && !isLoading && isPullUp() && isMore;
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}
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/**
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* 是否有更多
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*/
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public boolean isMore = true;
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/**
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* 判断是否到了最底部
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*/
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private boolean isBottom() {
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if (mListView != null && mListView.getAdapter() != null) {
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return mListView.getLastVisiblePosition() == (mListView.getAdapter().getCount() - 1);
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}
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return false;
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}
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/**
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* 是否是上拉操作
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*
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* @return
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*/
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private boolean isPullUp() {
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return (mYDown - mLastY) >= mTouchSlop;
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}
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/**
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* 如果到了最底部,而且是上拉操作.那么执行onLoad方法
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*/
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private void loadData() {
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if (mOnLoadListener != null) {
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// 设置状态
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setLoading(true);
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//
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mOnLoadListener.onLoad();
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}
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}
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/**
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* @param loading
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*/
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public void setLoading(boolean loading) {
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if (disableLoading)
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return;
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isLoading = loading;
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if (isLoading) {
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mListView.addFooterView(mListViewFooter);
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} else {
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if (mListView != null && mListViewFooter != null) {
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mListView.removeFooterView(mListViewFooter);
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mYDown = 0;
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mLastY = 0;
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}
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}
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}
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//是否允许加载更多 默认允许加载更多
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boolean disableLoading = false;
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public void disableLoad() {
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disableLoading = true;
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}
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public void enableLoad() {
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disableLoading = false;
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}
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/**
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* @param loadListener
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*/
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public void setOnLoadListener(OnLoadListener loadListener) {
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mOnLoadListener = loadListener;
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}
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@Override
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public void onScrollStateChanged(AbsListView view, int scrollState) {
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}
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@Override
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public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
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int totalItemCount) {
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// 滚动时到了最底部也可以加载更多
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if (!disableLoading && canLoad()) {
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loadData();
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}
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}
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public static interface OnLoadListener {
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public void onLoad();
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}
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}
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