RecycleView实现内部拖拽排序和两个RecycleView拖拽对调条目的Demo

package com.qianmo.dragrecyclerview; import android.content.Context; import android.graphics.Rect; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.ViewConfiguration; import android.view.animation.LinearInterpolator; import android.widget.LinearLayout; import android.widget.Scroller; import android.widget.TextView; import androidx.recyclerview.widget.LinearLayoutManager; import androidx.recyclerview.widget.RecyclerView; import com.example.recycleviewdemo.R; /** * Created by Administrator on 2017/3/14 0014. * E-Mail：[email protected] */ public class SwipeRecyclerView extends RecyclerView { private static final String TAG = "RecycleView"; private int maxLength, mTouchSlop; private int xDown, yDown, xMove, yMove; /** * 当前选中的item索引（这个很重要） */ private int curSelectPosition; private Scroller mScroller; private LinearLayout mCurItemLayout, mLastItemLayout; private LinearLayout mLlHidden;//隐藏部分 private TextView mItemContent; private LinearLayout mItemDelete; /** * 隐藏部分长度 */ private int mHiddenWidth; /** * 记录连续移动的长度 */ private int mMoveWidth = 0; /** * 是否是第一次touch */ private boolean isFirst = true; private Context mContext; /** * 删除的监听事件 */ private OnRightClickListener mRightListener; public void setRightClickListener(OnRightClickListener listener){ this.mRightListener = listener; } public SwipeRecyclerView(Context context) { this(context, null); } public SwipeRecyclerView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SwipeRecyclerView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); mContext = context; //滑动到最小距离 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); //滑动的最大距离 maxLength = ((int) (180 * context.getResources().getDisplayMetrics().density + 0.5f)); //初始化Scroller mScroller = new Scroller(context, new LinearInterpolator(context, null)); } @Override public boolean onTouchEvent(MotionEvent e) { int x = (int)e.getX(); int y = (int)e.getY(); switch (e.getAction()){ case MotionEvent.ACTION_DOWN: //记录当前按下的坐标 xDown = x; yDown = y; //计算选中哪个Item int firstPosition = ((LinearLayoutManager)getLayoutManager()).findFirstVisibleItemPosition(); Rect itemRect = new Rect(); final int count = getChildCount(); for (int i=0; i<count; i++){ final View child = getChildAt(i); if (child.getVisibility() == View.VISIBLE){ child.getHitRect(itemRect); if (itemRect.contains(x, y)){ curSelectPosition = firstPosition + i; break; } } } if (isFirst){//第一次时，不用重置上一次的Item isFirst = false; }else { //屏幕再次接收到点击时，恢复上一次Item的状态 if (mLastItemLayout != null && mMoveWidth > 0) { //将Item右移，恢复原位 scrollRight(mLastItemLayout, (0 - mMoveWidth)); //清空变量 mHiddenWidth = 0; mMoveWidth = 0; } } //取到当前选中的Item，赋给mCurItemLayout，以便对其进行左移 View item = getChildAt(curSelectPosition - firstPosition); if (item != null) { //获取当前选中的Item MyAdapter.ViewHolder viewHolder = (MyAdapter.ViewHolder) getChildViewHolder(item); mCurItemLayout = viewHolder.ll_item; //找到具体元素（这与实际业务相关了~~） mLlHidden = (LinearLayout)mCurItemLayout.findViewById(R.id.ll_hidden); mItemDelete = (LinearLayout)mCurItemLayout.findViewById(R.id.ll_hidden); mItemDelete.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (mRightListener != null){ //删除 mRightListener.onRightClick(curSelectPosition, ""); } } }); //这里将删除按钮的宽度设为可以移动的距离 mHiddenWidth = mLlHidden.getWidth(); } break; case MotionEvent.ACTION_MOVE: xMove = x; yMove = y; int dx = xMove - xDown;//为负时：手指向左滑动；为正时：手指向右滑动。这与Android的屏幕坐标定义有关 int dy = yMove - yDown;// //左滑 if (dx < 0 && Math.abs(dx) > mTouchSlop && Math.abs(dy) < mTouchSlop){ int newScrollX = Math.abs(dx); if (mMoveWidth >= mHiddenWidth){//超过了，不能再移动了 newScrollX = 0; } else if (mMoveWidth + newScrollX > mHiddenWidth){//这次要超了， newScrollX = mHiddenWidth - mMoveWidth; } //左滑，每次滑动手指移动的距离 scrollLeft(mCurItemLayout, newScrollX); //对移动的距离叠加 mMoveWidth = mMoveWidth + newScrollX; }else if (dx > 0){//右滑 //执行右滑，这里没有做跟随，瞬间恢复 scrollRight(mCurItemLayout, 0 - mMoveWidth); mMoveWidth = 0; } break; case MotionEvent.ACTION_UP://手抬起时 int scrollX = mCurItemLayout.getScrollX(); if (mHiddenWidth > mMoveWidth) { int toX = (mHiddenWidth - mMoveWidth); if (scrollX > mHiddenWidth / 2) {//超过一半长度时松开，则自动滑到左侧 scrollLeft(mCurItemLayout, toX); mMoveWidth = mHiddenWidth; } else {//不到一半时松开，则恢复原状 scrollRight(mCurItemLayout, 0 - mMoveWidth); mMoveWidth = 0; } } mLastItemLayout = mCurItemLayout; break; } return super.onTouchEvent(e); } @Override public void computeScroll() { if (mScroller.computeScrollOffset()) { Log.e(TAG, "computeScroll getCurrX ->" + mScroller.getCurrX()); mCurItemLayout.scrollBy(mScroller.getCurrX(), 0); invalidate(); } } /** * 向左滑动 */ private void scrollLeft(View item, int scorllX){ Log.e(TAG, " scroll left -> " + scorllX); item.scrollBy(scorllX, 0); } /** * 向右滑动 */ private void scrollRight(View item, int scorllX){ Log.e(TAG, " scroll right -> " + scorllX); item.scrollBy(scorllX, 0); } public interface OnRightClickListener{ void onRightClick(int position, String id); } }