标签：左滑 int private shoppingtrollery Android View Recyclerview public view

1.先创建一个工具类

SlideRecyclerView

public class SlideRecyclerView extends RecyclerView {

    private static final String TAG = "SlideRecyclerView";
    private static final int INVALID_POSITION = -1; // 触摸到的点不在子View范围内
    private static final int INVALID_CHILD_WIDTH = -1;  // 子ItemView不含两个子View
    private static final int SNAP_VELOCITY = 600;   // 最小滑动速度

    private VelocityTracker mVelocityTracker;   // 速度追踪器
    private int mTouchSlop; // 认为是滑动的最小距离（一般由系统提供）
    private Rect mTouchFrame;   // 子View所在的矩形范围
    private Scroller mScroller;
    private float mLastX;   // 滑动过程中记录上次触碰点X
    private float mFirstX, mFirstY; // 首次触碰范围
    private boolean mIsSlide;   // 是否滑动子View
    private ViewGroup mFlingView;   // 触碰的子View
    private int mPosition;  // 触碰的view的位置
    private int mMenuViewWidth;    // 菜单按钮宽度

    public SlideRecyclerView(Context context) {
        this(context, null);
    }

    public SlideRecyclerView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public SlideRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
        mScroller = new Scroller(context);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent e) {
        int x = (int) e.getX();
        int y = (int) e.getY();
        obtainVelocity(e);
        switch (e.getAction()) {
            case MotionEvent.ACTION_DOWN:
                if (!mScroller.isFinished()) {  // 如果动画还没停止，则立即终止动画
                    mScroller.abortAnimation();
                }
                mFirstX = mLastX = x;
                mFirstY = y;
                mPosition = pointToPosition(x, y);  // 获取触碰点所在的position
                if (mPosition != INVALID_POSITION) {
                    View view = mFlingView;
                    // 获取触碰点所在的view
                    mFlingView = (ViewGroup) getChildAt(mPosition - ((LinearLayoutManager) getLayoutManager()).findFirstVisibleItemPosition());
                    // 这里判断一下如果之前触碰的view已经打开，而当前碰到的view不是那个view则立即关闭之前的view，此处并不需要担动画没完成冲突，因为之前已经abortAnimation
                    if (view != null && mFlingView != view && view.getScrollX() != 0) {
                        view.scrollTo(0, 0);
                    }
                    // 这里进行了强制的要求，RecyclerView的子ViewGroup必须要有2个子view,这样菜单按钮才会有值，
                    // 需要注意的是:如果不定制RecyclerView的子View，则要求子View必须要有固定的width。
                    // 比如使用LinearLayout作为根布局，而content部分width已经是match_parent，此时如果菜单view用的是wrap_content，menu的宽度就会为0。
                    if (mFlingView.getChildCount() == 2) {
                        mMenuViewWidth = mFlingView.getChildAt(1).getWidth();
                    } else {
                        mMenuViewWidth = INVALID_CHILD_WIDTH;
                    }
                }
                break;
            case MotionEvent.ACTION_MOVE:
                mVelocityTracker.computeCurrentVelocity(1000);
                // 此处有俩判断，满足其一则认为是侧滑：
                // 1.如果x方向速度大于y方向速度，且大于最小速度限制；
                // 2.如果x方向的侧滑距离大于y方向滑动距离，且x方向达到最小滑动距离；
                float xVelocity = mVelocityTracker.getXVelocity();
                float yVelocity = mVelocityTracker.getYVelocity();
                if (Math.abs(xVelocity) > SNAP_VELOCITY && Math.abs(xVelocity) > Math.abs(yVelocity)
                        || Math.abs(x - mFirstX) >= mTouchSlop
                        && Math.abs(x - mFirstX) > Math.abs(y - mFirstY)) {
                    mIsSlide = true;
                    return true;
                }
                break;
            case MotionEvent.ACTION_UP:
                releaseVelocity();
                break;
        }
        return super.onInterceptTouchEvent(e);
    }

    @Override
    public boolean onTouchEvent(MotionEvent e) {
        if (mIsSlide && mPosition != INVALID_POSITION) {
            float x = e.getX();
            obtainVelocity(e);
            switch (e.getAction()) {
                case MotionEvent.ACTION_DOWN:   // 因为没有拦截，所以不会被调用到
                    break;
                case MotionEvent.ACTION_MOVE:
                    // 随手指滑动
                    if (mMenuViewWidth != INVALID_CHILD_WIDTH) {
                        float dx = mLastX - x;
                        if (mFlingView.getScrollX() + dx <= mMenuViewWidth
                                && mFlingView.getScrollX() + dx > 0) {
                            mFlingView.scrollBy((int) dx, 0);
                        }
                        mLastX = x;
                    }
                    break;
                case MotionEvent.ACTION_UP:
                    if (mMenuViewWidth != INVALID_CHILD_WIDTH) {
                        int scrollX = mFlingView.getScrollX();
                        mVelocityTracker.computeCurrentVelocity(1000);
                        // 此处有两个原因决定是否打开菜单：
                        // 1.菜单被拉出宽度大于菜单宽度一半；
                        // 2.横向滑动速度大于最小滑动速度；
                        // 注意：之所以要小于负值，是因为向左滑则速度为负值
                        if (mVelocityTracker.getXVelocity() < -SNAP_VELOCITY) {    // 向左侧滑达到侧滑最低速度，则打开
                            mScroller.startScroll(scrollX, 0, mMenuViewWidth - scrollX, 0, Math.abs(mMenuViewWidth - scrollX));
                        } else if (mVelocityTracker.getXVelocity() >= SNAP_VELOCITY) {  // 向右侧滑达到侧滑最低速度，则关闭
                            mScroller.startScroll(scrollX, 0, -scrollX, 0, Math.abs(scrollX));
                        } else if (scrollX >= mMenuViewWidth / 2) { // 如果超过删除按钮一半，则打开
                            mScroller.startScroll(scrollX, 0, mMenuViewWidth - scrollX, 0, Math.abs(mMenuViewWidth - scrollX));
                        } else {    // 其他情况则关闭
                            mScroller.startScroll(scrollX, 0, -scrollX, 0, Math.abs(scrollX));
                        }
                        invalidate();
                    }
                    mMenuViewWidth = INVALID_CHILD_WIDTH;
                    mIsSlide = false;
                    mPosition = INVALID_POSITION;
                    releaseVelocity();  // 这里之所以会调用，是因为如果前面拦截了，就不会执行ACTION_UP,需要在这里释放追踪
                    break;
            }
            return true;
        } else {
            // 此处防止RecyclerView正常滑动时，还有菜单未关闭
            closeMenu();
            // Velocity，这里的释放是防止RecyclerView正常拦截了，但是在onTouchEvent中却没有被释放；
            // 有三种情况：1.onInterceptTouchEvent并未拦截，在onInterceptTouchEvent方法中，DOWN和UP一对获取和释放；
            // 2.onInterceptTouchEvent拦截，DOWN获取，但事件不是被侧滑处理，需要在这里进行释放；
            // 3.onInterceptTouchEvent拦截，DOWN获取，事件被侧滑处理，则在onTouchEvent的UP中释放。
            releaseVelocity();
        }
        return super.onTouchEvent(e);
    }

    private void releaseVelocity() {
        if (mVelocityTracker != null) {
            mVelocityTracker.clear();
            mVelocityTracker.recycle();
            mVelocityTracker = null;
        }
    }

    private void obtainVelocity(MotionEvent event) {
        if (mVelocityTracker == null) {
            mVelocityTracker = VelocityTracker.obtain();
        }
        mVelocityTracker.addMovement(event);
    }

    public int pointToPosition(int x, int y) {
        if (null == getLayoutManager()) return INVALID_POSITION;
        int firstPosition = ((LinearLayoutManager) getLayoutManager()).findFirstVisibleItemPosition();
        Rect frame = mTouchFrame;
        if (frame == null) {
            mTouchFrame = new Rect();
            frame = mTouchFrame;
        }

        final int count = getChildCount();
        for (int i = count - 1; i >= 0; i--) {
            final View child = getChildAt(i);
            if (child.getVisibility() == View.VISIBLE) {
                child.getHitRect(frame);
                if (frame.contains(x, y)) {
                    return firstPosition + i;
                }
            }
        }
        return INVALID_POSITION;
    }

    @Override
    public void computeScroll() {
        if (mScroller.computeScrollOffset()) {
            mFlingView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
            invalidate();
        }
    }

    /**
     * 将显示子菜单的子view关闭
     * 这里本身是要自己来实现的，但是由于不定制item，因此不好监听器点击事件，因此需要调用者手动的关闭
     */
    public void closeMenu() {
        if (mFlingView != null && mFlingView.getScrollX() != 0) {
            mFlingView.scrollTo(0, 0);
        }
    }
}

2.主布局

<com.xxx.xxx.SlideRecyclerView
    android:id="@+id/shoppingtrolley_rv"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

3.子布局

adapter_shoppingtrollery

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:background="#FFF8F8F8"
    android:clickable="true">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/dp_133"
        android:layout_marginTop="@dimen/dp_12"
        android:background="@color/white">
        <CheckBox
            android:id="@+id/shoppingtrollery_ischeck"
            android:layout_width="@dimen/dp_20"
            android:layout_height="@dimen/dp_20"
            android:button="@null"
            android:background="@drawable/shoppingtrollery_selector"
            android:layout_marginStart="@dimen/dp_14"
            android:layout_centerVertical="true"/>
        <ImageView
            android:id="@+id/shoppingtrollery_iv"
            android:layout_width="@dimen/dp_100"
            android:layout_height="@dimen/dp_100"
            android:src="@mipmap/logo"
            android:layout_toEndOf="@+id/shoppingtrollery_ischeck"
            android:layout_centerVertical="true"
            android:layout_marginStart="@dimen/dp_11"/>
        <TextView
            android:id="@+id/shoppingtrollery_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="超级团品polo衫"
            android:textSize="@dimen/sp_16"
            android:textColor="@color/_333333"
            android:layout_toEndOf="@+id/shoppingtrollery_iv"
            android:layout_marginTop="@dimen/dp_22"
            android:layout_marginStart="@dimen/dp_14"
            android:textStyle="bold"/>
        <TextView
            android:id="@+id/shoppingtrollery_type"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="2瓶装套装"
            android:textSize="@dimen/sp_12"
            android:textColor="@color/_333333"
            android:layout_toEndOf="@+id/shoppingtrollery_iv"
            android:layout_below="@+id/shoppingtrollery_name"
            android:layout_marginTop="@dimen/dp_12"
            android:layout_marginStart="@dimen/dp_14"/>
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_below="@+id/shoppingtrollery_type"
            android:layout_marginTop="@dimen/dp_6"
            android:layout_toEndOf="@+id/shoppingtrollery_iv"
            android:layout_marginStart="@dimen/dp_11">
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="￥"
                android:textSize="@dimen/sp_12"
                android:textColor="@color/black"
                android:textStyle="bold"/>
            <TextView
                android:id="@+id/shoppingtrollery_price"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="400.00"
                android:textSize="@dimen/sp_18"
                android:textColor="@color/black"
                android:textStyle="bold"/>
        </LinearLayout>
        <LinearLayout
            android:layout_width="@dimen/dp_72"
            android:layout_height="@dimen/dp_24"
            android:orientation="horizontal"
            android:layout_alignParentEnd="true"
            android:layout_marginEnd="@dimen/dp_12"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="@dimen/dp_17"
            android:background="@drawable/shoppingtrollery_adddelete_bg">
            <TextView
                android:id="@+id/shoppingtrollery_subtract"
                android:layout_width="@dimen/dp_0"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:text="－"
                android:textColor="@color/_333333"
                android:textSize="@dimen/sp_15"
                android:gravity="center"
                android:textStyle="bold"/>
            <TextView
                android:id="@+id/shoppingtrollery_count"
                android:layout_width="@dimen/dp_0"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:text="1"
                android:textColor="@color/_333333"
                android:textSize="@dimen/sp_15"
                android:gravity="center"
                android:textStyle="bold"/>
            <TextView
                android:id="@+id/shoppingtrollery_add"
                android:layout_width="@dimen/dp_0"
                android:layout_weight="1"
                android:layout_height="match_parent"
                android:text="+"
                android:textColor="@color/_333333"
                android:textSize="@dimen/sp_15"
                android:gravity="center"
                android:textStyle="bold"/>
        </LinearLayout>
    </RelativeLayout>
    <LinearLayout
        android:layout_width="@dimen/dp_84"
        android:layout_height="match_parent"
        android:orientation="horizontal">
        <TextView
            android:id="@+id/shoppingtrollery_delete"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#FFE6212A"
            android:gravity="center"
            android:text="删除"
            android:textColor="@color/white"
            android:textSize="@dimen/sp_16" />
    </LinearLayout>
</LinearLayout>

4.适配器

ShoppingtrolleyAdapter

public class ShoppingtrolleyAdapter extends RecyclerView.Adapter<ShoppingtrolleyAdapter.Myvh> {

    Context context;
    List<String> list;
    private OnItemClickListener mOnItemClickListener;

    public ShoppingtrolleyAdapter(Context context) {
        this.context = context;
        list = new ArrayList<>();
    }

    public void setList(List<String> list) {
        this.list = list;
        notifyDataSetChanged();
    }

    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        mOnItemClickListener = onItemClickListener;
    }

    public interface OnItemClickListener {
        void onItemClick(View view, int position);
    }

    @NonNull
    @NotNull
    @Override
    public ShoppingtrolleyAdapter.Myvh onCreateViewHolder(@NonNull @NotNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.adapter_shoppingtrollery,parent,false);
        return new ShoppingtrolleyAdapter.Myvh(view);
    }

    @SuppressLint("SetTextI18n")
    @Override
    public void onBindViewHolder(@NonNull @NotNull ShoppingtrolleyAdapter.Myvh holder, int position) {

        //左滑删除事件
        holder.shoppingtrollery_delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mOnItemClickListener != null) {
                    mOnItemClickListener.onItemClick(v, position);
                }
            }
        });
    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    public class Myvh extends RecyclerView.ViewHolder {

        private final CheckBox shoppingtrollery_ischeck;
        private final ImageView shoppingtrollery_iv;
        private final TextView shoppingtrollery_name;
        private final TextView shoppingtrollery_type;
        private final TextView shoppingtrollery_price;
        private final TextView shoppingtrollery_subtract;
        private final TextView shoppingtrollery_count;
        private final TextView shoppingtrollery_add;
        private final TextView shoppingtrollery_delete;

        public Myvh(@NonNull @NotNull View itemView) {
            super(itemView);

            shoppingtrollery_ischeck = itemView.findViewById(R.id.shoppingtrollery_ischeck);
            shoppingtrollery_iv = itemView.findViewById(R.id.shoppingtrollery_iv);
            shoppingtrollery_name = itemView.findViewById(R.id.shoppingtrollery_name);
            shoppingtrollery_type = itemView.findViewById(R.id.shoppingtrollery_type);
            shoppingtrollery_price = itemView.findViewById(R.id.shoppingtrollery_price);
            shoppingtrollery_subtract = itemView.findViewById(R.id.shoppingtrollery_subtract);
            shoppingtrollery_count = itemView.findViewById(R.id.shoppingtrollery_count);
            shoppingtrollery_add = itemView.findViewById(R.id.shoppingtrollery_add);
            shoppingtrollery_delete = itemView.findViewById(R.id.shoppingtrollery_delete);
        }
    }
}

5.主页代码

    /**
     * 购物车列表
     */
    private void setlistdata() {

        SlideRecyclerView shoppingtrolley_rv = findViewById(R.id.shoppingtrolley_rv);
        // 创建布局管理
        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        shoppingtrolley_rv.setLayoutManager(layoutManager);

        //模拟数据
        List<String> list = new ArrayList<>();
        list.add("a");
        list.add("a");
        list.add("a");
        list.add("a");
        list.add("a");
        ShoppingtrolleyAdapter shoppingtrolleyAdapter = new ShoppingtrolleyAdapter(this);
        shoppingtrolleyAdapter.setList(list);
        shoppingtrolley_rv.setAdapter(shoppingtrolleyAdapter);

        //左滑删除
        shoppingtrolleyAdapter.setOnItemClickListener(new ShoppingtrolleyAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
                list.remove(position);
                shoppingtrolleyAdapter.notifyDataSetChanged();
                //Toast.makeText(ShoppingtrolleyActivity.this, ""+position, Toast.LENGTH_SHORT).show();
            }
        });
    }

标签：左滑,int,private,shoppingtrollery,Android,View,Recyclerview,public,view
来源： https://blog.csdn.net/weixin_42630638/article/details/118491312

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