自定义RecyclerView 支持 横向纵向，滑动删除Item
jopen
9年前
项目源码已经放上去：https://github.com/xufeifandj/SwipeRecyclerView
本项目直接 继承于RecyclerView 本身就支持 横向纵向的 列表。
具体代码请看代码。
package com.ferris.holeswipeview; import android.content.Context; import android.support.v7.widget.RecyclerView; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.VelocityTracker; import android.view.View; import android.view.ViewConfiguration; import android.view.WindowManager; import android.widget.AdapterView; import android.widget.Scroller; /** * http://blog.csdn.net/xufeifandj www.github.com/xufeifandj * * @ferris 459821731@qq.com * */ public class CusomSwipeView extends RecyclerView { private Orientation orientation = Orientation.HORIZONTAL; /** * 当前滑动的ListView position */ private int slidePosition; /** * 手指按下X的坐标 */ private int downY; /** * 手指按下Y的坐标 */ private int downX; /** * 屏幕宽度 */ private int screenWidth; /** * ListView的item */ private View itemView; /** * 滑动类 */ private Scroller scroller; private static final int SNAP_VELOCITY = 600; /** * 速度追踪对象 */ private VelocityTracker velocityTracker; /** * 是否响应滑动，默认为不响应 */ private boolean isSlide = false; /** * 认为是用户滑动的最小距离 */ private int mTouchSlop; /** * 移除item后的回调接口 */ private RemoveListener mRemoveListener; /** * 用来指示item滑出屏幕的方向,向左或者向右,用一个枚举值来标记 */ private RemoveDirection removeDirection; // 滑动删除方向的枚举值 public enum RemoveDirection { RIGHT, LEFT; } public CusomSwipeView(Context context) { super(context); // TODO Auto-generated constructor stub init(context); } public CusomSwipeView(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub init(context); } public CusomSwipeView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub init(context); } public void init(Context context) { if (orientation == Orientation.VERTICAL) { screenWidth = ((WindowManager) context .getSystemService(Context.WINDOW_SERVICE)) .getDefaultDisplay().getWidth(); } else { screenWidth = ((WindowManager) context .getSystemService(Context.WINDOW_SERVICE)) .getDefaultDisplay().getHeight(); } scroller = new Scroller(context); mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop(); } /** * 设置滑动删除的回调接口 * * @param removeListener */ public void setRemoveListener(RemoveListener removeListener) { this.mRemoveListener = removeListener; } /** * 分发事件，主要做的是判断点击的是那个item, 以及通过postDelayed来设置响应左右滑动事件 */ @Override public boolean dispatchTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: { addVelocityTracker(event); // 假如scroller滚动还没有结束，我们直接返回 if (!scroller.isFinished()) { return super.dispatchTouchEvent(event); } downX = (int) event.getX(); downY = (int) event.getY(); itemView = findChildViewUnder(downX, downY); if (itemView == null) { return super.dispatchTouchEvent(event); } slidePosition = getChildPosition(itemView); // 无效的position, 不做任何处理 if (slidePosition == AdapterView.INVALID_POSITION) { return super.dispatchTouchEvent(event); } break; } case MotionEvent.ACTION_MOVE: { if (orientation == Orientation.VERTICAL) {// 如果 // 左右滑动的距离大于最大的滑动距离，并且没有上下滑动，就代表 // 右滑删除或者左滑删除 if (Math.abs(getScrollVelocity()) > SNAP_VELOCITY || (Math.abs(event.getX() - downX) > mTouchSlop && Math .abs(event.getY() - downY) < mTouchSlop)) { isSlide = true; } } else { // 如果 上下滑动的距离大于最大的滑动距离，并且没有左右滑动，就代表上滑删除或者下滑删除 if (Math.abs(getScrollVelocity()) > SNAP_VELOCITY || (Math.abs(event.getY() - downY) > mTouchSlop && Math .abs(event.getX() - downX) < mTouchSlop)) { isSlide = true; } } break; } case MotionEvent.ACTION_UP: recycleVelocityTracker(); break; } return super.dispatchTouchEvent(event); } /** * 往右滑动，getScrollX()返回的是左边缘的距离，就是以View左边缘为原点到开始滑动的距离，所以向右边滑动为负值 */ private void scrollRight() { if (orientation == Orientation.VERTICAL) {// 往右滑动 removeDirection = RemoveDirection.RIGHT; final int delta = (screenWidth + itemView.getScrollX()); // 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item scroller.startScroll(itemView.getScrollX(), 0, -delta, 0, Math.abs(delta)); postInvalidate(); // 刷新itemView } else {// 往上滑动 removeDirection = RemoveDirection.RIGHT; final int delta = (screenWidth + itemView.getScrollY()); // 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item scroller.startScroll(0, itemView.getScrollY(), -delta, 0, Math.abs(delta)); postInvalidate(); // 刷新itemView } } /** * 向左滑动，根据上面我们知道向左滑动为正值 */ private void scrollLeft() { if (orientation == Orientation.VERTICAL) {// 往左滑动 removeDirection = RemoveDirection.LEFT; final int delta = (screenWidth - itemView.getScrollX()); // 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item scroller.startScroll(itemView.getScrollX(), 0, delta, 0, Math.abs(delta)); postInvalidate(); // 刷新itemView } else { removeDirection = RemoveDirection.LEFT; final int delta = (screenWidth - itemView.getScrollY()); // 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item scroller.startScroll(0, itemView.getScrollY(), delta, 0, Math.abs(delta)); postInvalidate(); // 刷新itemView } } /** * 根据手指滚动itemView的距离来判断是滚动到开始位置还是向左或者向右滚动 */ private void scrollByDistanceX() { // 如果向左滚动的距离大于屏幕的二分之一，就让其删除 if (orientation == Orientation.VERTICAL) { if (itemView.getScrollX() >= screenWidth / 2) { scrollLeft(); } else if (itemView.getScrollX() <= -screenWidth / 2) { scrollRight(); } else { // 滚回到原始位置,为了偷下懒这里是直接调用scrollTo滚动 itemView.scrollTo(0, 0); } } else { if (itemView.getScrollY() >= screenWidth / 2) { scrollLeft(); } else if (itemView.getScrollY() <= -screenWidth / 2) { scrollRight(); } else { // 滚回到原始位置,为了偷下懒这里是直接调用scrollTo滚动 itemView.scrollTo(0, 0); } } } /** * 处理我们拖动ListView item的逻辑 */ @Override public boolean onTouchEvent(MotionEvent ev) { if (isSlide && slidePosition != AdapterView.INVALID_POSITION && itemView != null) { requestDisallowInterceptTouchEvent(true); addVelocityTracker(ev); final int action = ev.getAction(); int x = (int) ev.getX(); int y = (int) ev.getY(); switch (action) { case MotionEvent.ACTION_DOWN: break; case MotionEvent.ACTION_MOVE: MotionEvent cancelEvent = MotionEvent.obtain(ev); cancelEvent .setAction(MotionEvent.ACTION_CANCEL | (ev.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT)); onTouchEvent(cancelEvent); if (orientation == Orientation.VERTICAL) { int deltaX = downX - x; downX = x; // 手指拖动itemView滚动, deltaX大于0向左滚动，小于0向右滚 itemView.scrollBy(deltaX, 0); } else { int deltaY = downY - y; downY = y; itemView.scrollBy(0, deltaY); } return true; // 拖动的时候ListView不滚动 case MotionEvent.ACTION_UP: int velocityX = getScrollVelocity(); if (velocityX > SNAP_VELOCITY) { scrollRight(); } else if (velocityX < -SNAP_VELOCITY) { scrollLeft(); } else { scrollByDistanceX(); } recycleVelocityTracker(); // 手指离开的时候就不响应左右滚动 isSlide = false; break; } } // 否则直接交给ListView来处理onTouchEvent事件 return super.onTouchEvent(ev); } @Override public void computeScroll() { // 调用startScroll的时候scroller.computeScrollOffset()返回true， if (scroller.computeScrollOffset()) { // 让ListView item根据当前的滚动偏移量进行滚动 itemView.scrollTo(scroller.getCurrX(), scroller.getCurrY()); postInvalidate(); // 滚动动画结束的时候调用回调接口 if (scroller.isFinished()) { if (mRemoveListener == null) { throw new NullPointerException( "RemoveListener is null, we should called setRemoveListener()"); } itemView.scrollTo(0, 0); mRemoveListener.removeItem(removeDirection, slidePosition); } } } /** * 添加用户的速度跟踪器 * * @param event */ private void addVelocityTracker(MotionEvent event) { if (velocityTracker == null) { velocityTracker = VelocityTracker.obtain(); } velocityTracker.addMovement(event); } /** * 移除用户速度跟踪器 */ private void recycleVelocityTracker() { if (velocityTracker != null) { velocityTracker.recycle(); velocityTracker = null; } } /** * 获取X方向的滑动速度,大于0向右滑动，反之向左 * * @return */ private int getScrollVelocity() { if (orientation == Orientation.VERTICAL) { velocityTracker.computeCurrentVelocity(1000); int velocity = (int) velocityTracker.getXVelocity(); return velocity; }else{ velocityTracker.computeCurrentVelocity(1000); int velocity = (int) velocityTracker.getYVelocity(); return velocity; } } /** * * 当ListView item滑出屏幕，回调这个接口 我们需要在回调方法removeItem()中移除该Item,然后刷新ListView * * */ public interface RemoveListener { public void removeItem(RemoveDirection direction, int position); } public static enum Orientation { HORIZONTAL(0), VERTICAL(1); private int value; private Orientation(int i) { value = i; } public int value() { return value; } public static Orientation valueOf(int i) { switch (i) { case 0: return HORIZONTAL; case 1: return VERTICAL; default: throw new RuntimeException("[0->HORIZONTAL, 1->VERTICAL]"); } } } } 来自：http://blog.csdn.net/xufeifandj/article/details/46618423