简单RecyclerView入门

compile 'com.android.support:recyclerview-v7:25.2.0'

RecyclerView依赖跟版本一致

简单介绍

http://blog.csdn.net/lmj623565791/article/details/45059587

添加分割线
http://www.jianshu.com/p/4eff036360da

动画
http://blog.csdn.net/hongtao_studio/article/details/50733118

http://m.blog.csdn.net/article/details?id=53392877

//添加依赖
https://github.com/wasabeef/recyclerview-animators

import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.view.View;import android.widget.Toast;import java.util.ArrayList;public class MainActivity extends AppCompatActivity {    private RecyclerView recyclerView;    private ArrayList<String> list=new ArrayList<>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //找控件        recyclerView = (RecyclerView) findViewById(R.id.recyclerview);        //布局管理器        LinearLayoutManager layoutManager=new LinearLayoutManager(this);        //添加        recyclerView.setLayoutManager(layoutManager);        //分割线        MyDecoration myDecoration=new MyDecoration(this,MyDecoration.VERTICAL_LIST);        //添加分割线        recyclerView.addItemDecoration(myDecoration);        //数据        getDat();    }    private void getDat() {        for (int i=0;i<50;i++){            list.add("条目"+i);        }        //适配器        final MyAdapter myAdapter = new MyAdapter(this, list);        //添加适配器        recyclerView.setAdapter(myAdapter);        //点击事件        myAdapter.setOnItemclick(new MyAdapter.OnItemclick() {            @Override            public void onItemclick(View view, int position) {                Toast.makeText(MainActivity.this, "条目的点击监听：" + position, Toast.LENGTH_SHORT).show();                //添加动画                MyItemAnimator animator = new MyItemAnimator();                //添加动画时间                animator.setAddDuration(2000);                myAdapter.add(position, "新的添加的条目");                recyclerView.setItemAnimator(animator);                //移动动画时间                animator.setMoveDuration(2000);            }        });        //长按事件        myAdapter.setOnItemlongclick(new MyAdapter.OnItemlongclick() {            @Override            public void onItemlongclick(View view, int position) {                Toast.makeText(MainActivity.this, "条目的长按监听：" + position, Toast.LENGTH_SHORT).show();                //删除动画                MyItemAnimator animator = new MyItemAnimator();                //删除动画时间                animator.setRemoveDuration(2000);                myAdapter.remove(position);                recyclerView.setItemAnimator(animator);                //移动动画时间                animator.setMoveDuration(2000);            }        });    }}

main布局

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    >    <android.support.v7.widget.RecyclerView        android:id="@+id/recyclerview"        android:layout_width="match_parent"        android:layout_height="match_parent"></android.support.v7.widget.RecyclerView></RelativeLayout>

适配器

import android.app.Activity;import android.content.Context;import android.support.v7.widget.RecyclerView;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.TextView;import java.util.List;/** * 类的用途: * * @name 姜军 * @time 2017/4/14 13:38 */public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {    private Context context;    private List<String> list;    public MyAdapter(Context context, List<String> list) {        this.context = context;        this.list = list;    }    //定义接口    public OnItemclick onItemclick;    public OnItemlongclick onItemlongclick;    //定义点击事件    public interface  OnItemclick{        void onItemclick(View view,int position);    }    //定义长按监听    public interface OnItemlongclick{        void onItemlongclick(View view,int position);    }    //提供点击事件set方法    public void setOnItemclick(OnItemclick onItemclick) {        this.onItemclick = onItemclick;    }    //提供长按监听set方法    public void setOnItemlongclick(OnItemlongclick onItemlongclick) {        this.onItemlongclick = onItemlongclick;    }    @Override    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        //获取布局        View view=View.inflate(context, R.layout.item,null);        //获取item        final MyViewHolder holder=new MyViewHolder(view);        //获取屏幕宽        int width =((Activity)context).getWindow().getWindowManager().getDefaultDisplay().getWidth();        //赋值屏幕宽        parent.getLayoutParams().width=width;        //点击事件        view.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //判断接口不位空                if (onItemclick!=null){                    //获取position                    int position = holder.getLayoutPosition();                    //传值                    onItemclick.onItemclick(v,position);                }            }        });        //长按事件        view.setOnLongClickListener(new View.OnLongClickListener() {            @Override            public boolean onLongClick(View v) {                //判断接口不位空                if (onItemlongclick!=null){                    //获取position                    int position = holder.getLayoutPosition();                    //传值                    onItemlongclick.onItemlongclick(v,position);                }                //事件消费                return true;            }        });        //返回item        return holder;    }    @Override    public void onBindViewHolder(MyViewHolder holder, int position) {        holder.text.setText(list.get(position));    }    @Override    public int getItemCount() {        return list.size();    }    public class MyViewHolder extends RecyclerView.ViewHolder{        private final TextView text;        private final ImageView imageView;        public MyViewHolder(View itemView) {            super(itemView);            text = (TextView) itemView.findViewById(R.id.text);            imageView = (ImageView) itemView.findViewById(R.id.image);        }    }    //添加数据    public void add(int position, String text) {        list.add(position, text);        notifyItemInserted(position);    }    //移除数据    public void remove(int position) {        list.remove(position);        notifyItemRemoved(position);    }    //改变数据    public void change(int position, String text) {        list.remove(position);        list.add(position, text);        notifyItemChanged(position);    }}

布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    <TextView        android:id="@+id/text"        android:textColor="@android:color/background_dark"        android:textSize="20dp"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /><ImageView    android:id="@+id/image"    android:background="@mipmap/ic_launcher"    android:layout_width="50dp"    android:layout_height="50dp" /></LinearLayout>

动画

/* * Copyright (C) 2014 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */import android.support.annotation.NonNull;import android.support.v4.animation.AnimatorCompatHelper;import android.support.v4.view.ViewCompat;import android.support.v4.view.ViewPropertyAnimatorCompat;import android.support.v4.view.ViewPropertyAnimatorListener;import android.support.v7.widget.RecyclerView.ViewHolder;import android.support.v7.widget.SimpleItemAnimator;import android.view.View;import java.util.ArrayList;import java.util.List;public class MyItemAnimator extends SimpleItemAnimator {    private static final boolean DEBUG = false;    private ArrayList<ViewHolder> mPendingRemovals = new ArrayList<>();    private ArrayList<ViewHolder> mPendingAdditions = new ArrayList<>();    private ArrayList<MoveInfo> mPendingMoves = new ArrayList<>();    private ArrayList<ChangeInfo> mPendingChanges = new ArrayList<>();    ArrayList<ArrayList<ViewHolder>> mAdditionsList = new ArrayList<>();    ArrayList<ArrayList<MoveInfo>> mMovesList = new ArrayList<>();    ArrayList<ArrayList<ChangeInfo>> mChangesList = new ArrayList<>();    ArrayList<ViewHolder> mAddAnimations = new ArrayList<>();    ArrayList<ViewHolder> mMoveAnimations = new ArrayList<>();    ArrayList<ViewHolder> mRemoveAnimations = new ArrayList<>();    ArrayList<ViewHolder> mChangeAnimations = new ArrayList<>();    private static class MoveInfo {        public ViewHolder holder;        public int fromX, fromY, toX, toY;        MoveInfo(ViewHolder holder, int fromX, int fromY, int toX, int toY) {            this.holder = holder;            this.fromX = fromX;            this.fromY = fromY;            this.toX = toX;            this.toY = toY;        }    }    private static class ChangeInfo {        public ViewHolder oldHolder, newHolder;        public int fromX, fromY, toX, toY;        private ChangeInfo(ViewHolder oldHolder, ViewHolder newHolder) {            this.oldHolder = oldHolder;            this.newHolder = newHolder;        }        ChangeInfo(ViewHolder oldHolder, ViewHolder newHolder,                   int fromX, int fromY, int toX, int toY) {            this(oldHolder, newHolder);            this.fromX = fromX;            this.fromY = fromY;            this.toX = toX;            this.toY = toY;        }        @Override        public String toString() {            return "ChangeInfo{" +                    "oldHolder=" + oldHolder +                    ", newHolder=" + newHolder +                    ", fromX=" + fromX +                    ", fromY=" + fromY +                    ", toX=" + toX +                    ", toY=" + toY +                    '}';        }    }    @Override    public void runPendingAnimations() {        boolean removalsPending = !mPendingRemovals.isEmpty();        boolean movesPending = !mPendingMoves.isEmpty();        boolean changesPending = !mPendingChanges.isEmpty();        boolean additionsPending = !mPendingAdditions.isEmpty();        if (!removalsPending && !movesPending && !additionsPending && !changesPending) {            // nothing to animate            return;        }        // First, remove stuff        for (ViewHolder holder : mPendingRemovals) {            animateRemoveImpl(holder);        }        mPendingRemovals.clear();        // Next, move stuff        if (movesPending) {            final ArrayList<MoveInfo> moves = new ArrayList<>();            moves.addAll(mPendingMoves);            mMovesList.add(moves);            mPendingMoves.clear();            Runnable mover = new Runnable() {                @Override                public void run() {                    for (MoveInfo moveInfo : moves) {                        animateMoveImpl(moveInfo.holder, moveInfo.fromX, moveInfo.fromY,                                moveInfo.toX, moveInfo.toY);                    }                    moves.clear();                    mMovesList.remove(moves);                }            };            if (removalsPending) {                View view = moves.get(0).holder.itemView;                ViewCompat.postOnAnimationDelayed(view, mover, getRemoveDuration());            } else {                mover.run();            }        }        // Next, change stuff, to run in parallel with move animations        if (changesPending) {            final ArrayList<ChangeInfo> changes = new ArrayList<>();            changes.addAll(mPendingChanges);            mChangesList.add(changes);            mPendingChanges.clear();            Runnable changer = new Runnable() {                @Override                public void run() {                    for (ChangeInfo change : changes) {                        animateChangeImpl(change);                    }                    changes.clear();                    mChangesList.remove(changes);                }            };            if (removalsPending) {                ViewHolder holder = changes.get(0).oldHolder;                ViewCompat.postOnAnimationDelayed(holder.itemView, changer, getRemoveDuration());            } else {                changer.run();            }        }        // Next, add stuff        if (additionsPending) {            final ArrayList<ViewHolder> additions = new ArrayList<>();            additions.addAll(mPendingAdditions);            mAdditionsList.add(additions);            mPendingAdditions.clear();            Runnable adder = new Runnable() {                @Override                public void run() {                    for (ViewHolder holder : additions) {                        animateAddImpl(holder);                    }                    additions.clear();                    mAdditionsList.remove(additions);                }            };            if (removalsPending || movesPending || changesPending) {                long removeDuration = removalsPending ? getRemoveDuration() : 0;                long moveDuration = movesPending ? getMoveDuration() : 0;                long changeDuration = changesPending ? getChangeDuration() : 0;                long totalDelay = removeDuration + Math.max(moveDuration, changeDuration);                View view = additions.get(0).itemView;                ViewCompat.postOnAnimationDelayed(view, adder, totalDelay);            } else {                adder.run();            }        }    }    @Override    public boolean animateRemove(final ViewHolder holder) {        resetAnimation(holder);        mPendingRemovals.add(holder);        return true;    }    private void animateRemoveImpl(final ViewHolder holder) {        final View view = holder.itemView;//首先得到ItemView        final ViewPropertyAnimatorCompat animation = ViewCompat.animate(view);//开启一个属性动画        mRemoveAnimations.add(holder);//加入到要删除的VIew中        animation.setDuration(getRemoveDuration())//设置延迟时间                .translationX(view.getWidth()).setListener(new VpaListenerAdapter() {//listener是开始和结束的监听            @Override            public void onAnimationStart(View view) {                dispatchRemoveStarting(holder);            }            @Override            public void onAnimationEnd(View view) {                animation.setListener(null);//当动画结束的时候要将监听置为空                //ViewCompat.setAlpha(view, 1);//因为有复用布局的问题，所以你将控件删除的时候需要将他还原，要不会出现重复问题                ViewCompat.setTranslationX(view,0);//因为有复用布局的问题，所以你将控件删除的时候需要将他还原，要不会出现重复问题                dispatchRemoveFinished(holder);                mRemoveAnimations.remove(holder);                dispatchFinishedWhenDone();            }        }).start();    }    @Override    public boolean animateAdd(final ViewHolder holder) {        resetAnimation(holder);        //ViewCompat.setAlpha(holder.itemView, 0);        ViewCompat.setTranslationX(holder.itemView,-holder.itemView.getWidth());        mPendingAdditions.add(holder);        return true;    }    void animateAddImpl(final ViewHolder holder) {        final View view = holder.itemView;        final ViewPropertyAnimatorCompat animation = ViewCompat.animate(view);        mAddAnimations.add(holder);        //animation.alpha(1).setDuration(getAddDuration()).        animation.translationX(0).setDuration(getAddDuration()).                setListener(new VpaListenerAdapter() {                    @Override                    public void onAnimationStart(View view) {                        dispatchAddStarting(holder);                    }                    @Override                    public void onAnimationCancel(View view) {                        ViewCompat.setAlpha(view, 1);                    }                    @Override                    public void onAnimationEnd(View view) {                        animation.setListener(null);                        dispatchAddFinished(holder);                        mAddAnimations.remove(holder);                        dispatchFinishedWhenDone();                    }                }).start();    }    @Override    public boolean animateMove(final ViewHolder holder, int fromX, int fromY,                               int toX, int toY) {        final View view = holder.itemView;        fromX += ViewCompat.getTranslationX(holder.itemView);        fromY += ViewCompat.getTranslationY(holder.itemView);        resetAnimation(holder);        int deltaX = toX - fromX;        int deltaY = toY - fromY;        if (deltaX == 0 && deltaY == 0) {            dispatchMoveFinished(holder);            return false;        }        if (deltaX != 0) {            ViewCompat.setTranslationX(view, -deltaX);        }        if (deltaY != 0) {            ViewCompat.setTranslationY(view, -deltaY);        }        mPendingMoves.add(new MoveInfo(holder, fromX, fromY, toX, toY));        return true;    }    void animateMoveImpl(final ViewHolder holder, int fromX, int fromY, int toX, int toY) {        final View view = holder.itemView;        final int deltaX = toX - fromX;        final int deltaY = toY - fromY;        if (deltaX != 0) {            ViewCompat.animate(view).translationX(0);        }        if (deltaY != 0) {            ViewCompat.animate(view).translationY(0);        }        // TODO: make EndActions end listeners instead, since end actions aren't called when        // vpas are canceled (and can't end them. why?)        // need listener functionality in VPACompat for this. Ick.        final ViewPropertyAnimatorCompat animation = ViewCompat.animate(view);        animation.rotationXBy(180);        mMoveAnimations.add(holder);        animation.setDuration(getMoveDuration()).setListener(new VpaListenerAdapter() {            @Override            public void onAnimationStart(View view) {                dispatchMoveStarting(holder);            }            @Override            public void onAnimationCancel(View view) {                if (deltaX != 0) {                    ViewCompat.setTranslationX(view, 0);                }                if (deltaY != 0) {                    ViewCompat.setTranslationY(view, 0);                }            }            @Override            public void onAnimationEnd(View view) {                animation.setListener(null);                ViewCompat.setRotationX(view,0);                dispatchMoveFinished(holder);                mMoveAnimations.remove(holder);                dispatchFinishedWhenDone();            }        }).start();    }    @Override    public boolean animateChange(ViewHolder oldHolder, ViewHolder newHolder,                                 int fromX, int fromY, int toX, int toY) {        if (oldHolder == newHolder) {            // Don't know how to run change animations when the same view holder is re-used.            // run a move animation to handle position changes.            return animateMove(oldHolder, fromX, fromY, toX, toY);        }        final float prevTranslationX = ViewCompat.getTranslationX(oldHolder.itemView);        final float prevTranslationY = ViewCompat.getTranslationY(oldHolder.itemView);        final float prevAlpha = ViewCompat.getAlpha(oldHolder.itemView);        resetAnimation(oldHolder);        int deltaX = (int) (toX - fromX - prevTranslationX);        int deltaY = (int) (toY - fromY - prevTranslationY);        // recover prev translation state after ending animation        ViewCompat.setTranslationX(oldHolder.itemView, prevTranslationX);        ViewCompat.setTranslationY(oldHolder.itemView, prevTranslationY);        ViewCompat.setAlpha(oldHolder.itemView, prevAlpha);        if (newHolder != null) {            // carry over translation values            resetAnimation(newHolder);            ViewCompat.setTranslationX(newHolder.itemView, -deltaX);            ViewCompat.setTranslationY(newHolder.itemView, -deltaY);            //ViewCompat.setAlpha(newHolder.itemView, 0);            //新的移除视线            ViewCompat.setTranslationX(newHolder.itemView,-newHolder.itemView.getWidth());        }        mPendingChanges.add(new ChangeInfo(oldHolder, newHolder, fromX, fromY, toX, toY));        return true;    }    void animateChangeImpl(final ChangeInfo changeInfo) {        final ViewHolder holder = changeInfo.oldHolder;        final View view = holder == null ? null : holder.itemView;        final ViewHolder newHolder = changeInfo.newHolder;        final View newView = newHolder != null ? newHolder.itemView : null;        if (view != null) {            final ViewPropertyAnimatorCompat oldViewAnim = ViewCompat.animate(view).setDuration(                    getChangeDuration());            mChangeAnimations.add(changeInfo.oldHolder);            oldViewAnim.translationX(changeInfo.toX - changeInfo.fromX);            oldViewAnim.translationY(changeInfo.toY - changeInfo.fromY);            //oldViewAnim.alpha(0).setListener(new VpaListenerAdapter() {            //老的移除            oldViewAnim.translationX(view.getWidth()).setListener(new VpaListenerAdapter() {                @Override                public void onAnimationStart(View view) {                    dispatchChangeStarting(changeInfo.oldHolder, true);                }                @Override                public void onAnimationEnd(View view) {                    oldViewAnim.setListener(null);                    ViewCompat.setAlpha(view, 1);                    ViewCompat.setTranslationX(view, 0);                    ViewCompat.setTranslationY(view, 0);                    dispatchChangeFinished(changeInfo.oldHolder, true);                    mChangeAnimations.remove(changeInfo.oldHolder);                    dispatchFinishedWhenDone();                }            }).start();        }        if (newView != null) {            final ViewPropertyAnimatorCompat newViewAnimation = ViewCompat.animate(newView);            mChangeAnimations.add(changeInfo.newHolder);            newViewAnimation.translationX(0).translationY(0).setDuration(getChangeDuration()).                    alpha(1).setListener(new VpaListenerAdapter() {                @Override                public void onAnimationStart(View view) {                    dispatchChangeStarting(changeInfo.newHolder, false);                }                @Override                public void onAnimationEnd(View view) {                    newViewAnimation.setListener(null);                    ViewCompat.setAlpha(newView, 1);                    ViewCompat.setTranslationX(newView, 0);                    ViewCompat.setTranslationY(newView, 0);                    dispatchChangeFinished(changeInfo.newHolder, false);                    mChangeAnimations.remove(changeInfo.newHolder);                    dispatchFinishedWhenDone();                }            }).start();        }    }    private void endChangeAnimation(List<ChangeInfo> infoList, ViewHolder item) {        for (int i = infoList.size() - 1; i >= 0; i--) {            ChangeInfo changeInfo = infoList.get(i);            if (endChangeAnimationIfNecessary(changeInfo, item)) {                if (changeInfo.oldHolder == null && changeInfo.newHolder == null) {                    infoList.remove(changeInfo);                }            }        }    }    private void endChangeAnimationIfNecessary(ChangeInfo changeInfo) {        if (changeInfo.oldHolder != null) {            endChangeAnimationIfNecessary(changeInfo, changeInfo.oldHolder);        }        if (changeInfo.newHolder != null) {            endChangeAnimationIfNecessary(changeInfo, changeInfo.newHolder);        }    }    private boolean endChangeAnimationIfNecessary(ChangeInfo changeInfo, ViewHolder item) {        boolean oldItem = false;        if (changeInfo.newHolder == item) {            changeInfo.newHolder = null;        } else if (changeInfo.oldHolder == item) {            changeInfo.oldHolder = null;            oldItem = true;        } else {            return false;        }        ViewCompat.setAlpha(item.itemView, 1);        ViewCompat.setTranslationX(item.itemView, 0);        ViewCompat.setTranslationY(item.itemView, 0);        dispatchChangeFinished(item, oldItem);        return true;    }    @Override    public void endAnimation(ViewHolder item) {        final View view = item.itemView;        // this will trigger end callback which should set properties to their target values.        ViewCompat.animate(view).cancel();        // TODO if some other animations are chained to end, how do we cancel them as well?        for (int i = mPendingMoves.size() - 1; i >= 0; i--) {            MoveInfo moveInfo = mPendingMoves.get(i);            if (moveInfo.holder == item) {                ViewCompat.setTranslationY(view, 0);                ViewCompat.setTranslationX(view, 0);                dispatchMoveFinished(item);                mPendingMoves.remove(i);            }        }        endChangeAnimation(mPendingChanges, item);        if (mPendingRemovals.remove(item)) {            ViewCompat.setAlpha(view, 1);            dispatchRemoveFinished(item);        }        if (mPendingAdditions.remove(item)) {            ViewCompat.setAlpha(view, 1);            dispatchAddFinished(item);        }        for (int i = mChangesList.size() - 1; i >= 0; i--) {            ArrayList<ChangeInfo> changes = mChangesList.get(i);            endChangeAnimation(changes, item);            if (changes.isEmpty()) {                mChangesList.remove(i);            }        }        for (int i = mMovesList.size() - 1; i >= 0; i--) {            ArrayList<MoveInfo> moves = mMovesList.get(i);            for (int j = moves.size() - 1; j >= 0; j--) {                MoveInfo moveInfo = moves.get(j);                if (moveInfo.holder == item) {                    ViewCompat.setTranslationY(view, 0);                    ViewCompat.setTranslationX(view, 0);                    dispatchMoveFinished(item);                    moves.remove(j);                    if (moves.isEmpty()) {                        mMovesList.remove(i);                    }                    break;                }            }        }        for (int i = mAdditionsList.size() - 1; i >= 0; i--) {            ArrayList<ViewHolder> additions = mAdditionsList.get(i);            if (additions.remove(item)) {                ViewCompat.setAlpha(view, 1);                dispatchAddFinished(item);                if (additions.isEmpty()) {                    mAdditionsList.remove(i);                }            }        }        // animations should be ended by the cancel above.        //noinspection PointlessBooleanExpression,ConstantConditions        if (mRemoveAnimations.remove(item) && DEBUG) {            throw new IllegalStateException("after animation is cancelled, item should not be in "                    + "mRemoveAnimations list");        }        //noinspection PointlessBooleanExpression,ConstantConditions        if (mAddAnimations.remove(item) && DEBUG) {            throw new IllegalStateException("after animation is cancelled, item should not be in "                    + "mAddAnimations list");        }        //noinspection PointlessBooleanExpression,ConstantConditions        if (mChangeAnimations.remove(item) && DEBUG) {            throw new IllegalStateException("after animation is cancelled, item should not be in "                    + "mChangeAnimations list");        }        //noinspection PointlessBooleanExpression,ConstantConditions        if (mMoveAnimations.remove(item) && DEBUG) {            throw new IllegalStateException("after animation is cancelled, item should not be in "                    + "mMoveAnimations list");        }        dispatchFinishedWhenDone();    }    private void resetAnimation(ViewHolder holder) {        AnimatorCompatHelper.clearInterpolator(holder.itemView);        endAnimation(holder);    }    @Override    public boolean isRunning() {        return (!mPendingAdditions.isEmpty() ||                !mPendingChanges.isEmpty() ||                !mPendingMoves.isEmpty() ||                !mPendingRemovals.isEmpty() ||                !mMoveAnimations.isEmpty() ||                !mRemoveAnimations.isEmpty() ||                !mAddAnimations.isEmpty() ||                !mChangeAnimations.isEmpty() ||                !mMovesList.isEmpty() ||                !mAdditionsList.isEmpty() ||                !mChangesList.isEmpty());    }    /**     * Check the state of currently pending and running animations. If there are none     * pending/running, call {@link #dispatchAnimationsFinished()} to notify any     * listeners.     */    void dispatchFinishedWhenDone() {        if (!isRunning()) {            dispatchAnimationsFinished();        }    }    @Override    public void endAnimations() {        int count = mPendingMoves.size();        for (int i = count - 1; i >= 0; i--) {            MoveInfo item = mPendingMoves.get(i);            View view = item.holder.itemView;            ViewCompat.setTranslationY(view, 0);            ViewCompat.setTranslationX(view, 0);            dispatchMoveFinished(item.holder);            mPendingMoves.remove(i);        }        count = mPendingRemovals.size();        for (int i = count - 1; i >= 0; i--) {            ViewHolder item = mPendingRemovals.get(i);            dispatchRemoveFinished(item);            mPendingRemovals.remove(i);        }        count = mPendingAdditions.size();        for (int i = count - 1; i >= 0; i--) {            ViewHolder item = mPendingAdditions.get(i);            View view = item.itemView;            ViewCompat.setAlpha(view, 1);            dispatchAddFinished(item);            mPendingAdditions.remove(i);        }        count = mPendingChanges.size();        for (int i = count - 1; i >= 0; i--) {            endChangeAnimationIfNecessary(mPendingChanges.get(i));        }        mPendingChanges.clear();        if (!isRunning()) {            return;        }        int listCount = mMovesList.size();        for (int i = listCount - 1; i >= 0; i--) {            ArrayList<MoveInfo> moves = mMovesList.get(i);            count = moves.size();            for (int j = count - 1; j >= 0; j--) {                MoveInfo moveInfo = moves.get(j);                ViewHolder item = moveInfo.holder;                View view = item.itemView;                ViewCompat.setTranslationY(view, 0);                ViewCompat.setTranslationX(view, 0);                dispatchMoveFinished(moveInfo.holder);                moves.remove(j);                if (moves.isEmpty()) {                    mMovesList.remove(moves);                }            }        }        listCount = mAdditionsList.size();        for (int i = listCount - 1; i >= 0; i--) {            ArrayList<ViewHolder> additions = mAdditionsList.get(i);            count = additions.size();            for (int j = count - 1; j >= 0; j--) {                ViewHolder item = additions.get(j);                View view = item.itemView;                ViewCompat.setAlpha(view, 1);                dispatchAddFinished(item);                additions.remove(j);                if (additions.isEmpty()) {                    mAdditionsList.remove(additions);                }            }        }        listCount = mChangesList.size();        for (int i = listCount - 1; i >= 0; i--) {            ArrayList<ChangeInfo> changes = mChangesList.get(i);            count = changes.size();            for (int j = count - 1; j >= 0; j--) {                endChangeAnimationIfNecessary(changes.get(j));                if (changes.isEmpty()) {                    mChangesList.remove(changes);                }            }        }        cancelAll(mRemoveAnimations);        cancelAll(mMoveAnimations);        cancelAll(mAddAnimations);        cancelAll(mChangeAnimations);        dispatchAnimationsFinished();    }    void cancelAll(List<ViewHolder> viewHolders) {        for (int i = viewHolders.size() - 1; i >= 0; i--) {            ViewCompat.animate(viewHolders.get(i).itemView).cancel();        }    }    /**     * {@inheritDoc}     * <p>     * If the payload list is not empty, DefaultItemAnimator returns <code>true</code>.     * When this is the case:     * <ul>     * <li>If you override {@link #animateChange(ViewHolder, ViewHolder, int, int, int, int)}, both     * ViewHolder arguments will be the same instance.     * </li>     * <li>     * If you are not overriding {@link #animateChange(ViewHolder, ViewHolder, int, int, int, int)},     * then DefaultItemAnimator will call {@link #animateMove(ViewHolder, int, int, int, int)} and     * run a move animation instead.     * </li>     * </ul>     */    @Override    public boolean canReuseUpdatedViewHolder(@NonNull ViewHolder viewHolder,                                             @NonNull List<Object> payloads) {        return !payloads.isEmpty() || super.canReuseUpdatedViewHolder(viewHolder, payloads);    }    private static class VpaListenerAdapter implements ViewPropertyAnimatorListener {        VpaListenerAdapter() {        }        @Override        public void onAnimationStart(View view) {}        @Override        public void onAnimationEnd(View view) {}        @Override        public void onAnimationCancel(View view) {}    }}

分割线

import android.support.v7.widget.RecyclerView;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.support.v7.widget.LinearLayoutManager;import android.view.View;/** * Created by wnw on 16-5-22. */public class MyDecoration extends RecyclerView.ItemDecoration {    private Context mContext;    private Drawable mDivider;    private int mOrientation;    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;    //我们通过获取系统属性中的listDivider来添加，在系统中的AppTheme中设置    public static final int[] ATRRS = new int[]{            android.R.attr.listDivider    };    public MyDecoration(Context context, int orientation) {        this.mContext = context;        final TypedArray ta = context.obtainStyledAttributes(ATRRS);        this.mDivider = ta.getDrawable(0);        ta.recycle();        setOrientation(orientation);    }    //设置屏幕的方向    public void setOrientation(int orientation) {        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {            throw new IllegalArgumentException("invalid orientation");        }        mOrientation = orientation;    }    @Override    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {        if (mOrientation == HORIZONTAL_LIST) {            drawVerticalLine(c, parent, state);        } else {            drawHorizontalLine(c, parent, state);        }    }    //画横线, 这里的parent其实是显示在屏幕显示的这部分    public void drawHorizontalLine(Canvas c, RecyclerView parent, RecyclerView.State state) {        int left = parent.getPaddingLeft();        int right = parent.getWidth() - parent.getPaddingRight();        final int childCount = parent.getChildCount();        for (int i = 0; i < childCount; i++) {            final View child = parent.getChildAt(i);            //获得child的布局信息            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();            final int top = child.getBottom() + params.bottomMargin;            final int bottom = top + mDivider.getIntrinsicHeight();            mDivider.setBounds(left, top, right, bottom);            mDivider.draw(c);            //Log.d("wnw", left + " " + top + " "+right+"   "+bottom+" "+i);        }    }    //画竖线    public void drawVerticalLine(Canvas c, RecyclerView parent, RecyclerView.State state) {        int top = parent.getPaddingTop();        int bottom = parent.getHeight() - parent.getPaddingBottom();        final int childCount = parent.getChildCount();        for (int i = 0; i < childCount; i++) {            final View child = parent.getChildAt(i);            //获得child的布局信息            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();            final int left = child.getRight() + params.rightMargin;            final int right = left + mDivider.getIntrinsicWidth();            mDivider.setBounds(left, top, right, bottom);            mDivider.draw(c);        }    }    //由于Divider也有长宽高，每一个Item需要向下或者向右偏移    @Override    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {        if (mOrientation == HORIZONTAL_LIST) {            //画横线，就是往下偏移一个分割线的高度            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());        } else {            //画竖线，就是往右偏移一个分割线的宽度            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);        }    }}

添加styles

<item name="android:listDivider">@drawable/divider</item>

divider.xml

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="rectangle">    <solid android:color="#7b7a7a"/>    <size android:height="1dp"/></shape>