android 下拉刷新的layout,继承后只需要关注不同状态时headerView的变化

package com.xx.xx.xx;import android.content.Context;import android.os.Handler;import android.os.SystemClock;import android.support.v4.view.ViewCompat;import android.util.AttributeSet;import android.view.GestureDetector;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.LinearLayout;import android.widget.ScrollView;import android.widget.Scroller;/** * 下拉刷新容器布局,继承使用 *  * @author yzx *  */public abstract class RefreshLayoutCompat extends LinearLayout {//// =============================== SET ==================================/** 设置header,不用设置LayoutParams */protected abstract View initHeaderView();/** 下拉时,变成松开就能刷新时调用(多次调用,避免重操作) ---------- ↑ 松开刷新 */protected abstract void onReadyToRefreshSet();/** 下拉时,设置最开始出现时的样式(多次调用,避免重操作) ---------- ↓ 下拉刷新 */protected abstract void onPullToRefreshSet();/** 刷新中样式设置(调用一次) ---------- 加载中...... */protected abstract void onRefreshingSet();/** 刷新成功或失败的提示设置 ---------- 刷新成功 */protected abstract void onRefreshOverSet(boolean isSuccess);/** header 的宽度 */protected int getHeaderWidth() {return -1;}/** header的高度 */protected int getHeaderHeight() {return 100;}/** 下拉时,当header全部显示后,再下拉多长距离可以松开刷新 */protected int getReadyToRefreshDistance() {return -headerOriginalTopMargin >> 1;}/** 刷新成功或失败的提示时长(毫秒) */protected int getResultNoticeTime() {return 500;}/** header进行Scroll时候的间隔频率 -------- 每秒刷新次数=1000/5 */protected int getHz() {return 5;}//// ===============================main==================================//private int downY;private int headerOriginalTopMargin;//private Scroller mScroller;private Handler mHandler = new Handler();private GestureDetector mGestureDetector;//private View headerView;private View canScrollView;@Overridepublic boolean onInterceptTouchEvent(MotionEvent ev) {if (!canRefresh || isRefreshing)return false;if (canScrollView == null)canScrollView = getChildCanScrollView(this);if (canScrollView == null)return false;return ViewCompat.canScrollVertically(canScrollView, -1) ? false : mGestureDetector.onTouchEvent(ev);}private boolean isUpToRefresh = false;private boolean isRefreshing = false;@Overridepublic boolean onTouchEvent(MotionEvent event) {// 如果 1设置刷新功能无效 2刷新中 3执行动画中 ,什么也不做if (!canRefresh || isRefreshing || mScroller.computeScrollOffset())return false;//switch (event.getAction()) {case MotionEvent.ACTION_MOVE:// 获取手指下拉的距离int moveDis = (int) (event.getY() - downY);// 如果距离为正数if (moveDis > 0) {// 当header完全显示,并且再下拉一段距离(getReadyToRefreshDistance方法)if (reLayoutHeader(headerOriginalTopMargin + moveDis / 3).topMargin >= getReadyToRefreshDistance()) {isUpToRefresh = true;onReadyToRefreshSet();} else {isUpToRefresh = false;onPullToRefreshSet();}}break;case MotionEvent.ACTION_UP:// 如果header的露出的距离为0,就什么也不做final RefreshLayoutCompat.LayoutParams tm = (LayoutParams) headerView.getLayoutParams();if (tm.topMargin == headerOriginalTopMargin)return isUpToRefresh = false;//runNewThread(new Runnable() {public void run() {// 根据是否是松开刷新,设置header的scroll距离int dx = (!isUpToRefresh) ? (headerOriginalTopMargin - tm.topMargin) : -tm.topMargin;mScroller.startScroll(0, tm.topMargin, 0, dx, (!isUpToRefresh) ? 400 : 150);startScrollHeader();// 如果是松开刷新,显示刷新中状态,执行刷新事件if (isUpToRefresh)runOnMain(new Runnable() {public void run() {isUpToRefresh = false;isRefreshing = true;onRefreshingSet();if (onRefreshListener != null)onRefreshListener.run();}});}});break;}return true;}public RefreshLayoutCompat(Context context, AttributeSet attrs) {super(context, attrs);setOrientation(1);// 初始化header,设置LayoutParams,并加入布局,位置为第一个headerView = initHeaderView();headerOriginalTopMargin = -getHeaderHeight();LayoutParams lp = new RefreshLayoutCompat.LayoutParams(getHeaderWidth(), -headerOriginalTopMargin);lp.topMargin = headerOriginalTopMargin;headerView.setLayoutParams(lp);addView(headerView, 0);//mScroller = new Scroller(context);//mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {public boolean onDown(MotionEvent e) {downY = (int) e.getY();return super.onDown(e);}public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {return e1.getY() <= e2.getY();}});}//// =============================private function=========================================////private void runNewThread(Runnable run) {Thread t = new Thread(run);t.setPriority(1);t.start();}private void runOnMain(Runnable run) {mHandler.post(run);}// 遍历获取可以滑动的ChildViewprivate View getChildCanScrollView(ViewGroup self) {for (int i = 0; i < self.getChildCount(); i++) {View child = self.getChildAt(i);if (child instanceof AbsListView || child instanceof ScrollView)return child;else if (child instanceof ViewGroup) {View subCanScrollView = getChildCanScrollView((ViewGroup) child);if (subCanScrollView instanceof AbsListView || subCanScrollView instanceof ScrollView)return subCanScrollView;}}return null;}// 重新设置header的topMarginprivate RefreshLayoutCompat.LayoutParams reLayoutHeader(int newTopMargin) {RefreshLayoutCompat.LayoutParams lp = (LayoutParams) headerView.getLayoutParams();lp.topMargin = newTopMargin;headerView.setLayoutParams(lp);return lp;}// 根据Scroller设置的距离,移动headerprivate void startScrollHeader() {Runnable backRun = new Runnable() {public void run() {reLayoutHeader(mScroller.getCurrY());}};while (mScroller.computeScrollOffset()) {runOnMain(backRun);SystemClock.sleep(getHz());}}//// =============================out side=========================================/////** 设置刷新结束,成功or失败 */public void setRefreshComplete(final boolean success) {runOnMain(new Runnable() {public void run() {onRefreshOverSet(success);}});runNewThread(new Runnable() {public void run() {SystemClock.sleep(getResultNoticeTime());mScroller.startScroll(0, 0, 0, headerOriginalTopMargin, 300);startScrollHeader();isRefreshing = false;}});}private Runnable onRefreshListener;private boolean canRefresh = true;/** 是否启用下拉刷新 */public void setCanRefresh(boolean canRefresh) {this.canRefresh = canRefresh;}/** 设置..你懂得 */public void setOnRefreshListener(Runnable onRefreshListener) {this.onRefreshListener = onRefreshListener;}}