微信对话列表滑动删除效果很不错的,借鉴了github上SwipeListVIEw(项目地址:https://github.com/likebamboo/SwipeListView),在其上进行了一些重构,最终实现了微信对话列表滑动删除效果。
实现原理
1.通过ListVIEw的pointToposition(int x,int y)来获取按下的position,然后通过androID.vIEw.VIEwGroup.getChildAt(position)来得到滑动对象swipeview
2.在ontouchEvent中计算要滑动的距离,调用swipeview.scrollTo即可。
运行效果如下
下面是最核心的部分SwipeListVIEw代码:
package com.fxsky.swipeList.Widget;import androID.annotation.Suppresslint;import androID.content.Context;import androID.content.res.TypedArray;import androID.os.Handler;import androID.os.Message;import androID.util.AttributeSet;import androID.vIEw.MotionEvent;import androID.vIEw.VIEw;import androID.Widget.ListVIEw;import com.fxsky.swipeList.R;public class SwipeListVIEw extends ListVIEw { private Boolean mIsHorizontal; private VIEw mPreItemVIEw; private VIEw mCurrentItemVIEw; private float mFirstX; private float mFirstY; private int mRightVIEwWIDth; // private boolean mIsInAnimation = false; private final int mDuration = 100; private final int mDurationStep = 10; private boolean mIsShown; public SwipeListVIEw(Context context) { this(context,null); } public SwipeListVIEw(Context context,AttributeSet attrs) { this(context,attrs,0); } public SwipeListVIEw(Context context,AttributeSet attrs,int defStyle) { super(context,defStyle); TypedArray mTypedArray = context.obtainStyledAttributes(attrs,R.styleable.swipeListvIEwstyle); //获取自定义属性和默认值 mRightVIEwWIDth = (int) mTypedArray.getDimension(R.styleable.swipeListvIEwstyle_right_wIDth,200); mTypedArray.recycle(); } /** * return true,deliver to ListVIEw. return false,deliver to child. if * move,return true */ @OverrIDe public boolean onIntercepttouchEvent(MotionEvent ev) { float lastX = ev.getX(); float lastY = ev.getY(); switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: mIsHorizontal = null; System.out.println("onIntercepttouchEvent----->ACTION_DOWN"); mFirstX = lastX; mFirstY = lastY; int motionposition = pointToposition((int)mFirstX,(int)mFirstY); if (motionposition >= 0) { VIEw currentItemVIEw = getChildAt(motionposition - getFirstVisibleposition()); mPreItemVIEw = mCurrentItemVIEw; mCurrentItemVIEw = currentItemVIEw; } break; case MotionEvent.ACTION_MOVE: float dx = lastX - mFirstX; float dy = lastY - mFirstY; if (Math.abs(dx) >= 5 && Math.abs(dy) >= 5) { return true; } break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: System.out.println("onIntercepttouchEvent----->ACTION_UP"); if (mIsShown && (mPreItemVIEw != mCurrentItemVIEw || isHitCurItemleft(lastX))) { System.out.println("1---> hIDdenRight"); /** * 情况一: * <p> * 一个Item的右边布局已经显示, * <p> * 这时候点击任意一个item,那么那个右边布局显示的item隐藏其右边布局 */ hIDdenRight(mPreItemVIEw); } break; } return super.onIntercepttouchEvent(ev); } private boolean isHitCurItemleft(float x) { return x < getWIDth() - mRightVIEwWIDth; } /** * @param dx * @param dy * @return judge if can judge scroll direction */ private boolean judgeScrollDirection(float dx,float dy) { boolean canJudge = true; if (Math.abs(dx) > 30 && Math.abs(dx) > 2 * Math.abs(dy)) { mIsHorizontal = true; System.out.println("mIsHorizontal---->" + mIsHorizontal); } else if (Math.abs(dy) > 30 && Math.abs(dy) > 2 * Math.abs(dx)) { mIsHorizontal = false; System.out.println("mIsHorizontal---->" + mIsHorizontal); } else { canJudge = false; } return canJudge; } /** * return false,can't move any direction. return true,cant't move * vertical,can move horizontal. return super.ontouchEvent(ev),can move * both. */ @OverrIDe public boolean ontouchEvent(MotionEvent ev) { float lastX = ev.getX(); float lastY = ev.getY(); switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: System.out.println("---->ACTION_DOWN"); break; case MotionEvent.ACTION_MOVE: float dx = lastX - mFirstX; float dy = lastY - mFirstY; // confirm is scroll direction if (mIsHorizontal == null) { if (!judgeScrollDirection(dx,dy)) { break; } } if (mIsHorizontal) { if (mIsShown && mPreItemVIEw != mCurrentItemVIEw) { System.out.println("2---> hIDdenRight"); /** * 情况二: * <p> * 一个Item的右边布局已经显示, * <p> * 这时候左右滑动另外一个item,那个右边布局显示的item隐藏其右边布局 * <p> * 向左滑动只触发该情况,向右滑动还会触发情况五 */ hIDdenRight(mPreItemVIEw); } if (mIsShown && mPreItemVIEw == mCurrentItemVIEw) { dx = dx - mRightVIEwWIDth; System.out.println("======dx " + dx); } // can't move beyond boundary if (dx < 0 && dx > -mRightVIEwWIDth) { mCurrentItemVIEw.scrollTo((int)(-dx),0); } return true; } else { if (mIsShown) { System.out.println("3---> hIDdenRight"); /** * 情况三: * <p> * 一个Item的右边布局已经显示, * <p> * 这时候上下滚动ListVIEw,那么那个右边布局显示的item隐藏其右边布局 */ hIDdenRight(mPreItemVIEw); } } break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: System.out.println("============ACTION_UP"); clearpressedState(); if (mIsShown) { System.out.println("4---> hIDdenRight"); /** * 情况四: * <p> * 一个Item的右边布局已经显示, * <p> * 这时候左右滑动当前一个item,那个右边布局显示的item隐藏其右边布局 */ hIDdenRight(mPreItemVIEw); } if (mIsHorizontal != null && mIsHorizontal) { if (mFirstX - lastX > mRightVIEwWIDth / 2) { showRight(mCurrentItemVIEw); } else { System.out.println("5---> hIDdenRight"); /** * 情况五: * <p> * 向右滑动一个item,且滑动的距离超过了右边VIEw的宽度的一半,隐藏之。 */ hIDdenRight(mCurrentItemVIEw); } return true; } break; } return super.ontouchEvent(ev); } private voID clearpressedState() { // Todo current item is still has background,issue mCurrentItemVIEw.setpressed(false); setpressed(false); refreshDrawableState(); // invalIDate(); } private voID showRight(VIEw vIEw) { System.out.println("=========showRight"); Message msg = new MoveHandler().obtainMessage(); msg.obj = vIEw; msg.arg1 = vIEw.getScrollX(); msg.arg2 = mRightVIEwWIDth; msg.sendToTarget(); mIsShown = true; } private voID hIDdenRight(VIEw vIEw) { System.out.println("=========hIDdenRight"); if (mCurrentItemVIEw == null) { return; } Message msg = new MoveHandler().obtainMessage();// msg.obj = vIEw; msg.arg1 = vIEw.getScrollX(); msg.arg2 = 0; msg.sendToTarget(); mIsShown = false; } /** * show or hIDe right layout animation */ @Suppresslint("HandlerLeak") class MoveHandler extends Handler { int stepX = 0; int fromX; int toX; VIEw vIEw; private boolean mIsInAnimation = false; private voID animatioOver() { mIsInAnimation = false; stepX = 0; } @OverrIDe public voID handleMessage(Message msg) { super.handleMessage(msg); if (stepX == 0) { if (mIsInAnimation) { return; } mIsInAnimation = true; vIEw = (VIEw)msg.obj; fromX = msg.arg1; toX = msg.arg2; stepX = (int)((toX - fromX) * mDurationStep * 1.0 / mDuration); if (stepX < 0 && stepX > -1) { stepX = -1; } else if (stepX > 0 && stepX < 1) { stepX = 1; } if (Math.abs(toX - fromX) < 10) { vIEw.scrollTo(toX,0); animatioOver(); return; } } fromX += stepX; boolean isLastStep = (stepX > 0 && fromX > toX) || (stepX < 0 && fromX < toX); if (isLastStep) { fromX = toX; } vIEw.scrollTo(fromX,0); invalIDate(); if (!isLastStep) { this.sendEmptyMessageDelayed(0,mDurationStep); } else { animatioOver(); } } } public int getRightVIEwWIDth() { return mRightVIEwWIDth; } public voID setRightVIEwWIDth(int mRightVIEwWIDth) { this.mRightVIEwWIDth = mRightVIEwWIDth; }}
Demo下载地址:http://xiazai.jb51.net/201608/yuanma/SwipeListView(jb51.net).rar
Demo中SwipeAdapter源码中有一处由于粗心写错了,会导致向下滑动时出现数组越界异常,现更正如下:
@OverrIDe public int getCount() {// return 100; return data.size(); }
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