Android RecycleView实现防QQ左滑删除

仿QQ消息列表左滑弹出菜单，标记已读和删除

话不多说，看到这样的效果心动了么？

1.先上build .gradle，dependencies里面要这样写，其实就是导入v7里面的recyclerView。要用butterknife的话，记得加到这里来:

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:support-v4:23.4.0'
    compile 'com.android.support:recyclerview-v7:23.2.0'
    //butterknife
    compile 'com.jakewharton:butterknife:6.1.0'
}

2.再来列表的item， item_msg_remind.xml：

<?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="72dp"
    android:background="@color/white"
    android:orientation="horizontal">
    <!-- 消息主体,width记得match_parent,直接把后面两个布局顶出去 -->
    <LinearLayout
        android:id="@+id/ll_msg_remind_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/white"
        android:layout_marginLeft="15dp"
        android:layout_marginRight="8dp"
        android:orientation="horizontal">

        <View
            android:id="@+id/msg_remind_point"
            android:layout_width="15dp"
            android:layout_height="15dp"
            android:layout_gravity="center_vertical"
            android:background="@drawable/shape_remind_point_theme" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:padding="6dp">

            <TextView
                android:id="@+id/tv_remind_title"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:text="隔壁的二蛋" />

            <TextView
                android:id="@+id/tv_remind_content"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="2"
                android:ellipsize="end"
                android:maxLines="2"
                android:text="对方撤回了一条消息并砍了你的狗" />
        </LinearLayout>
    </LinearLayout>

    <LinearLayout
        android:layout_width="90dp"
        android:layout_height="match_parent"
        android:background="#D1BA74">

        <TextView
            android:id="@+id/tv_msg_remind_check"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="标记已读"
            android:textColor="@color/white" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="60dp"
        android:layout_height="match_parent"
        android:background="@color/theme_color">

        <TextView
            android:id="@+id/tv_msg_remind_delete"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="删除"
            android:textColor="@color/white" />
    </LinearLayout>

</LinearLayout>

3.那什么，Adapter来了，MsgRemindAdapter：

package com.simbaliu3.swiperecyclerlist;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import butterknife.ButterKnife;
import butterknife.InjectView;

/**
 * 消息adapter
 * <p/>
 * -->特别注意extends后面Adapter<>里面要写自己定义的ViewHolder
 */
public class MsgRemindAdapter extends RecyclerView.Adapter<MsgRemindAdapter.RemindViewHolder>
        implements ItemSlideHelper.Callback {

    private Context context;
    private List<MsgVo> mDatas = new ArrayList<MsgVo>();

    private RecyclerView mRecyclerView;

    public MsgRemindAdapter(Context context, List<MsgVo> mDatas) {
        this.context = context;
        this.mDatas = mDatas;
    }

    @Override
    public RemindViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).
                inflate(R.layout.item_msg_remind, parent, false);
        return new RemindViewHolder(view);
    }

    /**
     * 将recyclerView绑定Slide事件
     *
     * @param recyclerView
     */
    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
        mRecyclerView = recyclerView;
        mRecyclerView.addOnItemTouchListener(new ItemSlideHelper(mRecyclerView.getContext(), this));
    }

    @Override
    public void onBindViewHolder(final RemindViewHolder holder, final int position) {
        /**
         * 消息状态
         */
        if (mDatas.get(position).isChecked()) {
            holder.msgRemindPoint.setBackgroundResource(R.drawable.shape_remind_point_gray);
        } else {
            holder.msgRemindPoint.setBackgroundResource(R.drawable.shape_remind_point_theme);
        }
        //消息标题
        holder.tvRemindTitle.setText(mDatas.get(position).getTitle());
        //消息内容
        holder.tvRemindContent.setText(mDatas.get(position).getContent());

        /**
         * -->特别注意，敲黑板了啊！！！在执行notify的时候，取position要取holder.getAdapterPosition()，
         * 消息被删除之后，他原来的position是final的，所以取到的值不准确，会报数组越界。
         */

        //消息主体监听，这里我是让他添加一条数据，替换成你需要的操作即可
        holder.llMsgRemindMain.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                addData(mDatas.size());
            }
        });
        //标记已读监听
        holder.tvMsgRemindCheck.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mDatas.get(holder.getAdapterPosition()).setChecked(true);
                notifyItemChanged(holder.getAdapterPosition());
            }
        });
        //删除监听
        holder.tvMsgRemindDelete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                removeData(holder.getAdapterPosition());
            }
        });
    }

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

    /**
     * 此方法用来计算水平方向移动的距离
     *
     * @param holder
     * @return
     */
    @Override
    public int getHorizontalRange(RecyclerView.ViewHolder holder) {
        if (holder.itemView instanceof LinearLayout) {
            ViewGroup viewGroup = (ViewGroup) holder.itemView;
            //viewGroup包含3个控件，即消息主item、标记已读、删除，返回为标记已读宽度+删除宽度
            return viewGroup.getChildAt(1).getLayoutParams().width
                    + viewGroup.getChildAt(2).getLayoutParams().width;
        }
        return 0;
    }

    @Override
    public RecyclerView.ViewHolder getChildViewHolder(View childView) {
        return mRecyclerView.getChildViewHolder(childView);
    }

    @Override
    public View findTargetView(float x, float y) {
        return mRecyclerView.findChildViewUnder(x, y);
    }

    /**
     * 自定义的ViewHolder
     */
    public class RemindViewHolder extends RecyclerView.ViewHolder {
        @InjectView(R.id.msg_remind_point)
        View msgRemindPoint;
        @InjectView(R.id.tv_remind_title)
        TextView tvRemindTitle;
        @InjectView(R.id.tv_remind_content)
        TextView tvRemindContent;
        @InjectView(R.id.ll_msg_remind_main)
        LinearLayout llMsgRemindMain;
        @InjectView(R.id.tv_msg_remind_check)
        TextView tvMsgRemindCheck;
        @InjectView(R.id.tv_msg_remind_delete)
        TextView tvMsgRemindDelete;

        public RemindViewHolder(View itemView) {
            super(itemView);
            ButterKnife.inject(this, itemView);
        }
    }

    /**
     * 添加单条数据
     *
     * @param position
     */
    public void addData(int position) {
        MsgVo vo = new MsgVo();
        if (position % 2 == 1) {
            vo.setChecked(false);
            vo.setTitle("隔壁的二蛋");
            vo.setContent("对方撤回了一条消息并砍了你的狗，问你服不服。");
        } else {
            vo.setChecked(false);
            vo.setTitle("对面的三娃");
            vo.setContent("今天晚上开黑，4缺1，来不来？");
        }
        mDatas.add(position, vo);
        notifyItemInserted(position);
    }

    /**
     * 删除单条数据
     *
     * @param position
     */
    public void removeData(int position) {
        mDatas.remove(position);
        notifyItemRemoved(position);
    }

}

4.要做这么高难度的滑动，是要一个ItemSlideHelper的：

package com.simbaliu3.swiperecyclerlist;

import android.animation.Animator;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.graphics.Rect;
import android.support.v4.view.GestureDetectorCompat;
import android.support.v4.view.MotionEventCompat;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;

/**
 * 消息列表左滑菜单帮助类
 */
public class ItemSlideHelper implements RecyclerView.OnItemTouchListener, GestureDetector.OnGestureListener {

    private final int DEFAULT_DURATION = 200;
    private View mTargetView;

    private int mActivePointerId;
    private int mTouchSlop;
    private int mMaxVelocity;
    private int mMinVelocity;
    private int mLastX;
    private int mLastY;

    private boolean mIsDragging;
    private Animator mExpandAndCollapseAnim;
    private GestureDetectorCompat mGestureDetector;

    private Callback mCallback;

    public ItemSlideHelper(Context context, Callback callback) {
        this.mCallback = callback;

        //手势用于处理fling
        mGestureDetector = new GestureDetectorCompat(context, this);

        ViewConfiguration configuration = ViewConfiguration.get(context);
        mTouchSlop = configuration.getScaledTouchSlop();
        mMaxVelocity = configuration.getScaledMaximumFlingVelocity();
        mMinVelocity = configuration.getScaledMinimumFlingVelocity();
    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
        int action = MotionEventCompat.getActionMasked(e);
        int x = (int) e.getX();
        int y = (int) e.getY();


        //如果RecyclerView滚动状态不是空闲targetView不是空
        if (rv.getScrollState() != RecyclerView.SCROLL_STATE_IDLE) {
            if (mTargetView != null) {
                //隐藏已经打开
                smoothHorizontalExpandOrCollapse(DEFAULT_DURATION / 2);
                mTargetView = null;
            }

            return false;
        }

        //如果正在运行动画 ，直接拦截什么都不做
        if (mExpandAndCollapseAnim != null && mExpandAndCollapseAnim.isRunning()) {
            return true;
        }

        boolean needIntercept = false;
        switch (action) {
            case MotionEvent.ACTION_DOWN:

                mActivePointerId = MotionEventCompat.getPointerId(e, 0);
                mLastX = (int) e.getX();
                mLastY = (int) e.getY();

                /*
                * 如果之前有一个已经打开的项目，当此次点击事件没有发生在右侧的菜单中则返回TRUE，
                * 如果点击的是右侧菜单那么返回FALSE这样做的原因是因为菜单需要响应Onclick
                * */
                if (mTargetView != null) {
                    return !inView(x, y);
                }

                //查找需要显示菜单的view;
                mTargetView = mCallback.findTargetView(x, y);

                break;
            case MotionEvent.ACTION_MOVE:

                int deltaX = (x - mLastX);
                int deltaY = (y - mLastY);

                if (Math.abs(deltaY) > Math.abs(deltaX))
                    return false;

                //如果移动距离达到要求，则拦截
                needIntercept = mIsDragging = mTargetView != null && Math.abs(deltaX) >= mTouchSlop;
                break;

            case MotionEvent.ACTION_CANCEL:
            case MotionEvent.ACTION_UP:
                /*
                * 走这是因为没有发生过拦截事件
                * */
                if (isExpanded()) {

                    if (inView(x, y)) {
                        // 如果走这那行这个ACTION_UP的事件会发生在右侧的菜单中
                    } else {
                        //拦截事件,防止targetView执行onClick事件
                        needIntercept = true;
                    }

                    //折叠菜单
                    smoothHorizontalExpandOrCollapse(DEFAULT_DURATION / 2);
                }

                mTargetView = null;
                break;
        }

        return needIntercept;
    }

    private boolean isExpanded() {
        return mTargetView != null && mTargetView.getScrollX() == getHorizontalRange();
    }

    private boolean isCollapsed() {

        return mTargetView != null && mTargetView.getScrollX() == 0;
    }

    /*
    * 根据targetView的scrollX计算出targetView的偏移，这样能够知道这个point
    * 是在右侧的菜单中
    * */
    private boolean inView(int x, int y) {

        if (mTargetView == null)
            return false;

        int scrollX = mTargetView.getScrollX();
        int left = mTargetView.getWidth() - scrollX;
        int top = mTargetView.getTop();
        int right = left + getHorizontalRange();
        int bottom = mTargetView.getBottom();
        Rect rect = new Rect(left, top, right, bottom);
        return rect.contains(x, y);
    }


    @Override
    public void onTouchEvent(RecyclerView rv, MotionEvent e) {
        if (mExpandAndCollapseAnim != null && mExpandAndCollapseAnim.isRunning() || mTargetView == null)
            return;

        //如果要响应fling事件设置将mIsDragging设为false
        if (mGestureDetector.onTouchEvent(e)) {
            mIsDragging = false;
            return;
        }

        int x = (int) e.getX();
        int y = (int) e.getY();
        int action = MotionEventCompat.getActionMasked(e);
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                //RecyclerView 不会转发这个Down事件

                break;
            case MotionEvent.ACTION_MOVE:
                int deltaX = (int) (mLastX - e.getX());
                if (mIsDragging) {
                    horizontalDrag(deltaX);
                }
                mLastX = x;
                break;

            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:

                if (mIsDragging) {
                    if (!smoothHorizontalExpandOrCollapse(0) && isCollapsed())
                        mTargetView = null;

                    mIsDragging = false;
                }

                break;
        }
    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

    }

    /**
     * 根据touch事件来滚动View的scrollX
     *
     * @param delta
     */
    private void horizontalDrag(int delta) {
        int scrollX = mTargetView.getScrollX();
        int scrollY = mTargetView.getScrollY();
        if ((scrollX + delta) <= 0) {
            mTargetView.scrollTo(0, scrollY);
            return;
        }

        int horRange = getHorizontalRange();
        scrollX += delta;
        if (Math.abs(scrollX) < horRange) {
            mTargetView.scrollTo(scrollX, scrollY);
        } else {
            mTargetView.scrollTo(horRange, scrollY);
        }

    }

    /**
     * 根据当前scrollX的位置判断是展开还是折叠
     *
     * @param velocityX 如果不等于0那么这是一次fling事件,否则是一次ACTION_UP或者ACTION_CANCEL
     */
    private boolean smoothHorizontalExpandOrCollapse(float velocityX) {

        int scrollX = mTargetView.getScrollX();
        int scrollRange = getHorizontalRange();

        if (mExpandAndCollapseAnim != null)
            return false;

        int to = 0;
        int duration = DEFAULT_DURATION;

        if (velocityX == 0) {
            //如果已经展一半，平滑展开
            if (scrollX > scrollRange / 2) {
                to = scrollRange;
            }
        } else {

            if (velocityX > 0)
                to = 0;
            else
                to = scrollRange;

            duration = (int) ((1.f - Math.abs(velocityX) / mMaxVelocity) * DEFAULT_DURATION);
        }

        if (to == scrollX)
            return false;

        mExpandAndCollapseAnim = ObjectAnimator.ofInt(mTargetView, "scrollX", to);
        mExpandAndCollapseAnim.setDuration(duration);
        mExpandAndCollapseAnim.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animation) {

            }

            @Override
            public void onAnimationEnd(Animator animation) {
                mExpandAndCollapseAnim = null;
                if (isCollapsed())
                    mTargetView = null;

            }

            @Override
            public void onAnimationCancel(Animator animation) {
                //onAnimationEnd(animation);
                mExpandAndCollapseAnim = null;

            }

            @Override
            public void onAnimationRepeat(Animator animation) {

            }
        });
        mExpandAndCollapseAnim.start();

Android RecycleView实现防QQ左滑删除

Android RecycleView实现防QQ左滑删除

1.先上build .gradle，dependencies里面要这样写，其实就是导入v7里面的recyclerView。要用butterknife的话， 记得加到这里来:

2.再来列表的item， item_msg_remind.xml：

3.那什么，Adapter来了，MsgRemindAdapter：

4.要做这么高难度的滑动，是要一个ItemSlideHelper的：

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1.先上build .gradle，dependencies里面要这样写，其实就是导入v7里面的recyclerView。要用butterknife的话，记得加到这里来: