自定义下拉刷新
来源：互联网 发布：js怎样仿写shift 编辑：程序博客网 时间：2024/06/07 23:11
效果如下：
代码如下：
/* * Copyright (C) 2016 The AndroidSupport Project */package com.hyena.framework.app.widget;import android.content.Context;import android.os.Build;import android.support.v4.view.MotionEventCompat;import android.support.v4.view.ViewCompat;import android.support.v4.widget.SwipeRefreshLayout;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.StaggeredGridLayoutManager;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.view.ViewConfiguration;import android.view.ViewGroup;import android.view.animation.LinearInterpolator;import android.widget.AbsListView;import android.widget.RelativeLayout;import android.widget.ScrollView;import com.hyena.framework.R;import com.hyena.framework.clientlog.LogUtil;import com.hyena.framework.debug.InvokeHelper;import com.hyena.framework.utils.AnimationUtils;import com.hyena.framework.utils.UIUtils;import com.nineoldandroids.animation.Animator;import com.nineoldandroids.animation.ValueAnimator;/** * Created by yangzc on 16/9/14. */public class RefreshableLayout extends RelativeLayout { private static final int MODE_PULL_FROM_NONE = 0; private static final int MODE_PULL_FROM_START = 1; private static final int MODE_PULL_FROM_END = 2; private static final int MAX_MOVE_DISTANCE = UIUtils.dip2px(120); private View mTarget = null; private View mScrollerView = null; private int mTouchSlop = 0; private float mInitialDownY = -1; private float mInitialMotionY = -1; private boolean mIsBeingDragged; private int mCurrentMode = MODE_PULL_FROM_NONE; private boolean mRefreshing, mLoadingMore; private boolean mEnableRefresh = true, mEnableLoadMore = true; private AbsRefreshablePanel mHeaderPanel = null; private AbsRefreshablePanel mFooterPanel = null; public RefreshableLayout(Context context) { super(context); init(); } public RefreshableLayout(Context context, AttributeSet attrs) { super(context, attrs); init(); } private void init() { mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop(); relayout(); } public void setEnableRefresh(boolean enableRefresh) { this.mEnableRefresh = enableRefresh; } public void setEnableLoadMore(boolean enableLoadMore) { this.mEnableLoadMore = enableLoadMore; } private void relayout() { relayoutHeader(); relayoutFooter(); } private void relayoutHeader() { int paddingTop = 0; if (mHeaderPanel != null) { LayoutParams headerParams = new LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, mHeaderPanel.getContentHeight()); headerParams.addRule(ALIGN_PARENT_TOP); mHeaderPanel.setId(R.id.refresh_header); addView(mHeaderPanel, headerParams); paddingTop = -mHeaderPanel.getContentHeight(); } setPadding(0, paddingTop, 0, getPaddingBottom()); } private void relayoutFooter() { int paddingBottom = 0; if (mFooterPanel != null) { LayoutParams footerParams = new LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, mFooterPanel.getContentHeight()); footerParams.addRule(ALIGN_PARENT_BOTTOM); mFooterPanel.setId(R.id.refresh_footer); addView(mFooterPanel, footerParams); paddingBottom = -mFooterPanel.getContentHeight(); } setPadding(0, getPaddingTop(), 0, paddingBottom); } public void setHeaderPanel(AbsRefreshablePanel headerPanel) { if (mHeaderPanel != null) { removeView(mHeaderPanel); } this.mHeaderPanel = headerPanel; relayoutHeader(); } public void setFooterPanel(AbsRefreshablePanel footerPanel) { if (mFooterPanel != null) { removeView(mFooterPanel); } this.mFooterPanel = footerPanel; relayoutFooter(); } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); } @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); } @Override protected void onFinishInflate() { super.onFinishInflate(); if (mTarget == null) insureTarget(); if (mTarget != null) { LayoutParams params = (LayoutParams) mTarget.getLayoutParams(); params.addRule(RelativeLayout.BELOW, R.id.refresh_header); params.addRule(RelativeLayout.ABOVE, R.id.refresh_footer); } } @Override public void addView(View child, ViewGroup.LayoutParams params) { super.addView(child, params); if (mTarget == null) insureTarget(); if (mTarget != null) { LayoutParams targetParams = (LayoutParams) mTarget.getLayoutParams(); targetParams.addRule(RelativeLayout.BELOW, R.id.refresh_header); targetParams.addRule(RelativeLayout.ABOVE, R.id.refresh_footer); } } private void insureTarget() { if (getChildCount() > 0) { for (int i = 0; i < getChildCount(); i++) { View child = getChildAt(i); if (!(child instanceof AbsRefreshablePanel)) { mTarget = child; break; } } } insureScrollView(); } private void insureScrollView() { if (mScrollerView == null) { if (mTarget != null && mTarget instanceof SwipeRefreshLayout) { mScrollerView = (View) InvokeHelper.getFieldValue(mTarget, "mTarget"); } else { mScrollerView = mTarget; } } } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); insureScrollView(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); insureScrollView(); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { if (mRefreshing || mLoadingMore || (mHeaderPanel == null && mFooterPanel == null) || (!mEnableRefresh && !mEnableLoadMore)) { return false; } if (mTarget == null) { insureTarget(); } insureScrollView(); if (mTarget != null && mTarget instanceof SwipeRefreshLayout) { if (((SwipeRefreshLayout) mTarget).isRefreshing()) return false; } int action = MotionEventCompat.getActionMasked(ev); switch (action) { case MotionEvent.ACTION_DOWN: { mIsBeingDragged = false; mInitialDownY = ev.getY(); break; } case MotionEvent.ACTION_MOVE: { float y = ev.getY(); float yDiff = y - mInitialDownY; if (Math.abs(yDiff) > mTouchSlop && !mIsBeingDragged) { if (mHeaderPanel != null && mEnableRefresh && !canChildScrollUp() && yDiff > 1) { //top mCurrentMode = MODE_PULL_FROM_START; mInitialMotionY = mInitialDownY + mTouchSlop; mIsBeingDragged = true; } else if (mFooterPanel != null && mEnableLoadMore && !canChildScrollDown() && yDiff < -1) { //bottom mCurrentMode = MODE_PULL_FROM_END; mInitialMotionY = mInitialDownY + mTouchSlop; mIsBeingDragged = true; } else { //NO-OP } } break; } case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: { mIsBeingDragged = false; break; } } return mIsBeingDragged; } @Override public boolean onTouchEvent(MotionEvent event) { if (mRefreshing || mLoadingMore || (mHeaderPanel == null && mFooterPanel == null) || (!mEnableRefresh && !mEnableLoadMore)) return false; if (mTarget != null && mTarget instanceof SwipeRefreshLayout) { if (((SwipeRefreshLayout) mTarget).isRefreshing()) return false; } int action = MotionEventCompat.getActionMasked(event); switch (action) { case MotionEvent.ACTION_DOWN: { mIsBeingDragged = false; break; } case MotionEvent.ACTION_MOVE: { float y = event.getY(); float overScroll = (mInitialMotionY - y) * .5f; if (mIsBeingDragged) { if (mCurrentMode == MODE_PULL_FROM_START) { overScroll = Math.max(Math.min(0, overScroll), -MAX_MOVE_DISTANCE); } else if (mCurrentMode == MODE_PULL_FROM_END) { overScroll = Math.min(Math.max(0, overScroll), MAX_MOVE_DISTANCE); } else { overScroll = 0; } moveTarget(overScroll); } break; } case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: { mIsBeingDragged = false; moveRelease(); break; } } return true; } @Override public void requestDisallowInterceptTouchEvent(boolean b) { if ((Build.VERSION.SDK_INT < 21 && mScrollerView instanceof AbsListView) || (mScrollerView != null && !ViewCompat.isNestedScrollingEnabled(mScrollerView))) { // Nope. } else { super.requestDisallowInterceptTouchEvent(b); } } public void setRefreshing(boolean isRefreshing) { if (mHeaderPanel != null) { this.mRefreshing = isRefreshing; mCurrentMode = MODE_PULL_FROM_START; if (isRefreshing) { scroll(0, -mHeaderPanel.getContentHeight()); mHeaderPanel.setStatus(AbsRefreshablePanel.STATUS_REFRESH); } else { scroll(getScrollY(), 0); mHeaderPanel.setStatus(AbsRefreshablePanel.STATUS_RESET); } } } public void setLoadingMore(boolean isLoading) { if (mFooterPanel != null) { this.mLoadingMore = isLoading; mCurrentMode = MODE_PULL_FROM_END; if (isLoading) { scroll(0, mFooterPanel.getContentHeight()); mFooterPanel.setStatus(AbsRefreshablePanel.STATUS_REFRESH); } else { scroll(getScrollY(), 0); mFooterPanel.setStatus(AbsRefreshablePanel.STATUS_RESET); } } } /** * 手势释放 */ private void moveRelease() { AbsRefreshablePanel pullItem = null; int toScrollY = 0; if (mCurrentMode == MODE_PULL_FROM_START) { pullItem = mHeaderPanel; toScrollY = -pullItem.getContentHeight(); } else if (mCurrentMode == MODE_PULL_FROM_END) { pullItem = mFooterPanel; toScrollY = pullItem.getContentHeight(); } if (pullItem != null) { if (Math.abs(getScrollY()) >= pullItem.getContentHeight()) { pullItem.setStatus(AbsRefreshablePanel.STATUS_REFRESH); scroll(getScrollY(), toScrollY); if (mCurrentMode == MODE_PULL_FROM_START) { mRefreshing = true; if (mRefreshListener != null) { mRefreshListener.onRefresh(); } } else if (mCurrentMode == MODE_PULL_FROM_END) { mLoadingMore = true; if (mRefreshListener != null) { mRefreshListener.onLoadMore(); } } } else { scroll(getScrollY(), 0); } } } /** * 手势拖动 */ private void moveTarget(float overScroll) { scrollTo(0, (int) overScroll); AbsRefreshablePanel pullItem = null; if (mCurrentMode == MODE_PULL_FROM_START) { pullItem = mHeaderPanel; } else if (mCurrentMode == MODE_PULL_FROM_END) { pullItem = mFooterPanel; } if (pullItem != null) { pullItem.setScrolling(overScroll, pullItem.getContentHeight()); if (Math.abs(overScroll) >= pullItem.getContentHeight()) { pullItem.setStatus(AbsRefreshablePanel.STATUS_READY_REFRESH); } else { pullItem.setStatus(AbsRefreshablePanel.STATUS_START_PULL); } } } /** * 滚动回退 * * @param fromScroll 开始位置 * @param toScroll 结束位置 */ private void scroll(final float fromScroll, final float toScroll) { ValueAnimator animator = ValueAnimator.ofFloat(0.0f, 1.0f); animator.setDuration(200); animator.setInterpolator(new LinearInterpolator()); AnimationUtils.ValueAnimatorListener listener = new AnimationUtils.ValueAnimatorListener() { @Override public void onAnimationStart(Animator animator) { scrollTo(0, (int) fromScroll); } @Override public void onAnimationEnd(Animator animator) { scrollTo(0, (int) toScroll); } @Override public void onAnimationCancel(Animator animator) { scrollTo(0, (int) toScroll); } @Override public void onAnimationRepeat(Animator animator) { } @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { Float value = (Float) valueAnimator.getAnimatedValue(); float newScrollValue = value * (toScroll - fromScroll) + fromScroll; scrollTo(0, (int) newScrollValue); } }; animator.addUpdateListener(listener); animator.addListener(listener); animator.start(); } /** * 是否可以向上滚动 */ private boolean canChildScrollUp() { if (Build.VERSION.SDK_INT < 14) { if (mScrollerView instanceof AbsListView) { AbsListView listView = (AbsListView) mScrollerView; return listView.getChildCount() > 0 && (listView.getFirstVisiblePosition() > 0 || listView.getChildAt(0).getTop() < listView.getPaddingTop()); } else { return mScrollerView.getScrollY() > 0; } } else { return ViewCompat.canScrollVertically(mScrollerView, -1); } } /** * 是否可以向下滚动 */ private boolean canChildScrollDown() { if (!canChildScrollUp()) {//less data return true; } if (mScrollerView instanceof RecyclerView) { RecyclerView recyclerView = (RecyclerView) mScrollerView; RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager(); int count = recyclerView.getAdapter().getItemCount(); if (layoutManager instanceof LinearLayoutManager && count > 0) { LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager; if (linearLayoutManager.findLastCompletelyVisibleItemPosition() == count - 1) { return false; } } else if (layoutManager instanceof StaggeredGridLayoutManager) { StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager; int[] lastItems = new int[4]; staggeredGridLayoutManager.findLastCompletelyVisibleItemPositions(lastItems); int lastItem = max(lastItems); if (lastItem == count - 1) { return false; } } return true; } else if (mScrollerView instanceof AbsListView) { final AbsListView absListView = (AbsListView) mScrollerView; int count = absListView.getAdapter().getCount(); int firstVisiblePosition = absListView.getFirstVisiblePosition(); if (firstVisiblePosition == 0 && absListView.getChildAt(0).getTop() >= absListView .getPaddingTop()) { return false; } int lastPos = absListView.getLastVisiblePosition(); return lastPos > 0 && count > 0 && lastPos == count - 1; } else if (mScrollerView instanceof ScrollView) { ScrollView scrollView = (ScrollView) mScrollerView; View view = scrollView.getChildAt(scrollView.getChildCount() - 1); if (view != null) { int diff = (view.getBottom() - (scrollView.getHeight() + scrollView.getScrollY())); if (diff == 0) { return false; } } } else { return ViewCompat.canScrollVertically(mScrollerView, 1); } return true; } private int max(int[] a) { // 返回数组最大值 int x; int aa[] = new int[a.length]; System.arraycopy(a, 0, aa, 0, a.length); x = aa[0]; for (int i = 1; i < aa.length; i++) { if (aa[i] > x) { x = aa[i]; } } return x; } private OnRefreshListener mRefreshListener; public void setRefreshListener(OnRefreshListener listener) { this.mRefreshListener = listener; } public interface OnRefreshListener { void onRefresh(); void onLoadMore(); }} 0 0
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