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package com.qhclh.ytzh.ui; |
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import android.annotation.SuppressLint; |
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import android.content.Context; |
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import android.support.v4.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.AbsListView.OnScrollListener; |
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import android.widget.ListView; |
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import com.qhclh.ytzh.R; |
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import java.lang.reflect.InvocationTargetException; |
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import java.lang.reflect.Method; |
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/** |
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* 继承自SwipeRefreshLayout,从而实现滑动到底部时上拉加载更多的功能. |
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*/ |
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public class RefreshLayout extends SwipeRefreshLayout implements |
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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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/** |
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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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} |
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@SuppressLint("InflateParams") |
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public RefreshLayout(Context context, AttributeSet attrs) { |
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super(context, attrs); |
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mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); |
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mListViewFooter = LayoutInflater.from(context).inflate( |
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R.layout.listview_footer, null, false); |
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} |
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@Override |
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protected void onLayout(boolean changed, int left, int top, int right, |
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int bottom) { |
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super.onLayout(changed, left, top, right, 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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* |
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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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return super.dispatchTouchEvent(event); |
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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(); |
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} |
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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 |
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.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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isLoading = loading; |
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if (isLoading) { |
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mListView.addFooterView(mListViewFooter); |
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} else { |
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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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* @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, |
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int visibleItemCount, 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 (canLoad()) { |
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loadData(); |
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} |
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} |
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/** |
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* 设置刷新 |
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*/ |
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public static void setRefreshing(SwipeRefreshLayout refreshLayout, |
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boolean refreshing, boolean notify) { |
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Class<? extends SwipeRefreshLayout> refreshLayoutClass = refreshLayout |
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.getClass(); |
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if (refreshLayoutClass != null) { |
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try { |
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Method setRefreshing = refreshLayoutClass.getDeclaredMethod( |
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"setRefreshing", boolean.class, boolean.class); |
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setRefreshing.setAccessible(true); |
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setRefreshing.invoke(refreshLayout, refreshing, notify); |
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} catch (NoSuchMethodException e) { |
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e.printStackTrace(); |
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} catch (IllegalAccessException e) { |
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e.printStackTrace(); |
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} catch (InvocationTargetException e) { |
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e.printStackTrace(); |
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} |
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} |
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} |
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/** |
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* 加载更多的监听器 |
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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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} |