RecyclerView的Item点击事件，增加删除Item瀑布流动画效果，长按拖动Item，RecyclerView复杂布局、实现新闻频道选择器

RecyclerView的Item点击事件的实现，增加和删除Item使用瀑布流动画效果，长按拖动Item，RecyclerView复杂布局的实现使用、RecyclerView去实现今日头条新闻频道选择器。
使用ItemTouchHelper实现Item的拖动交换，由于RecyclerView本身没有自带的Item点击事件所以我们仿照ListView的Item点击事件利用RecyclerView自带findChildViewUnder方法的自己实现点击效果。
首先我们来看一下demo的运行效果：

demo源码下载连接：(http://download.youkuaiyun.com/detail/qq_30000411/9700050)

接下来是我们代码的实现，（注：本demo拖动事件的实现为不同类型的Item之间不能进行拖动）。

RecyclerView的适配器的实现扩展Item自定义的交换的接口并且重写交换方法，每个Item布局建立不同的ViewHolder，利用GridLayoutManager来实现每一个Item应该怎样放置（传入每个类型的公倍数)。
复杂布局不用类型的Item每行多少列的代码如下：

 GridLayoutManager gridLayoutManager = new
                GridLayoutManager(this.getApplicationContext(),4);
        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                AddPinDao addPinDao = addPinDaos.get(position);
                if (addPinDao.getTag() == 0 || addPinDao.getTag() == 2){
                    return 4;
                }else {
                    return 1;
                }
            }
        });

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适配器的代码如下：

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.Collections;
import java.util.List;

/**
 * 适配器添加频道的recyclerview 的适配器
 * Created by lwp940118 on 2016/11/28.
 */
public class RecyclerView_Add_Adapter extends RecyclerView.Adapter implements
        RecyclerViewAddItemCallBackListener{

    private int tag = 0;
    private List<AddPinDao> addPinDaos;
    private Context context;

    public RecyclerView_Add_Adapter(List<AddPinDao> addPinDaos,Context context){
        super();
        this.addPinDaos = addPinDaos;
        this.context = context;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = null;
        RecyclerView.ViewHolder viewHolder = null;
        switch (viewType){
            case 0:
                view = LayoutInflater.from(context).inflate(R.layout.recyclerview_add_item_one
                        ,parent,false);
                viewHolder = new ViewHolderOne(view);
                break;
            case 1:
                view = LayoutInflater.from(context).inflate(R.layout.recyclerview_add_item_my
                        ,parent,false);
                viewHolder = new ViewHolderMy(view);
                break;
            case 2:
                view = LayoutInflater.from(context).inflate(R.layout.recyclerview_add_item_tow
                        ,parent,false);
                viewHolder = new ViewHolderTow(view);
                break;
            case 3:
                view = LayoutInflater.from(context).inflate(R.layout.recyclerview_add_item_pindao
                        ,parent,false);
                viewHolder = new ViewHolderPinDao(view);
        }
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        AddPinDao addPinDao = addPinDaos.get(position);
        switch (getItemViewType(position)){
            case 0:
                final ViewHolderOne viewHolderOne = (ViewHolderOne)holder;
                viewHolderOne.textView_one.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        if (tag == 0) {
                            viewHolderOne.textView_one.setText("完 成");
                            viewHolderOne.textView_tuodong.setText("拖动可以排序");
                            tag = 1;
                            Log.e("----t2",""+tag);
                            for (int i = 0;i < addPinDaos.size();i++){
                                if (addPinDaos.get(i).getTag() == 1){
                                    addPinDaos.get(i).setMyTag(1);
                                }
                            }
                            notifyDataSetChanged();
                        }else {
                            viewHolderOne.textView_one.setText("编 辑");
                            viewHolderOne.textView_tuodong.setText("");
                            tag = 0;
                            Log.e("----t1",""+tag);
                            for (int i = 0;i < addPinDaos.size();i++){
                                if (addPinDaos.get(i).getTag() == 1){
                                    addPinDaos.get(i).setMyTag(0);
                                }
                            }
                            notifyDataSetChanged();
                        }
                    }
                });
                break;
            case 1:
                final ViewHolderMy viewHolderMy = (ViewHolderMy)holder;
                viewHolderMy.textView_my.setText(addPinDao.getMessage());
                if (addPinDao.getMyTag() == 1) {
                    viewHolderMy.imageView_my.setVisibility(View.VISIBLE);
                }else {
                    viewHolderMy.imageView_my.setVisibility(View.INVISIBLE);
                }
                break;
            case 2:
                final ViewHolderTow viewHolderTow = (ViewHolderTow)holder;
                break;
            case 3:
                final ViewHolderPinDao viewHolderPinDao = (ViewHolderPinDao)holder;
                viewHolderPinDao.textView_pin.setText(addPinDao.getMessage());
                break;
        }
    }

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

    @Override
    public int getItemViewType(int position) {
        AddPinDao addPinDao = addPinDaos.get(position);
        switch (addPinDao.getTag()){
            case 0:
                return 0;
            case 1:
                return 1;
            case 2:
                return 2;
            case 3:
                return 3;
        }
        return 0;
    }

    @Override
    public void onMove(int fromPosition, int toPosition) {
        AddPinDao addPinDao = addPinDaos.get(fromPosition);
        AddPinDao addPinDao1 = addPinDaos.get(toPosition);
        if (fromPosition != 1 && toPosition != 1) {
            if ((addPinDao.getTag() == 1 && addPinDao1.getTag() == 1) || (addPinDao.getTag()
                    == 3 && addPinDao1.getTag() == 3)) {
                //通知数组的移动
                Collections.swap(addPinDaos, fromPosition, toPosition);
                notifyItemMoved(fromPosition, toPosition);
            }
        }
    }

    class ViewHolderMy extends RecyclerView.ViewHolder{
        private TextView textView_my;
        private ImageView imageView_my;
        public ViewHolderMy(View itemView) {
            super(itemView);
            imageView_my = (ImageView)itemView.findViewById(R.id.imageView_recyclerview_add_itme_my);
            textView_my = (TextView)itemView.findViewById(R.id.textview_recyelerview_add_item_my);
        }
    }

    class ViewHolderPinDao extends RecyclerView.ViewHolder{

        private TextView textView_pin;

        public ViewHolderPinDao(View itemView) {
            super(itemView);
            textView_pin = (TextView) itemView.findViewById(R.id.textview_recyelerview_add_item_pindao);
        }
    }

    class ViewHolderOne extends RecyclerView.ViewHolder{
        private TextView textView_tuodong;
        private TextView textView_one;
        public ViewHolderOne(View itemView) {
            super(itemView);
            textView_one = (TextView)itemView.findViewById(R.id.textview_recyclerview_add_item_one);
            textView_tuodong = (TextView)itemView.findViewById(R.id.textview_recyclerview_add_item_one_tuodong);
        }
    }

    class ViewHolderTow extends RecyclerView.ViewHolder{

        public ViewHolderTow(View itemView) {
            super(itemView);
        }
    }

}

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Item交换接口的实现：

public interface RecyclerViewAddItemCallBackListener {
    /**
     * itme交换的接口
     * @param fromPosition
     * @param toPosition
     */
    void onMove(int fromPosition,int toPosition);
}

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利用ItemTouchHelper实现RecyclerView的Item长按拖动交换代码：

import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.support.v7.widget.helper.ItemTouchHelper;

/**
 * Created by lwp940118 on 2016/12/2.
 */
public class OnItemCallbackHelper extends ItemTouchHelper.Callback {

    private RecyclerView_Add_Adapter recyclerView_add_adapter;

    public OnItemCallbackHelper(RecyclerView_Add_Adapter recyclerView_add_adapter){
        this.recyclerView_add_adapter = recyclerView_add_adapter;
    }

    /**
     * 是否删除
     * @return
     */
    @Override
    public boolean isItemViewSwipeEnabled() {
        return false;
    }

    /**
     * 是否拖住
     * @return
     */
    @Override
    public boolean isLongPressDragEnabled() {
        return true;
    }



    @Override
    public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        int dragFlags;
        RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
        if(layoutManager instanceof GridLayoutManager || layoutManager instanceof StaggeredGridLayoutManager){
            dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN|ItemTouchHelper.START | ItemTouchHelper.END;
        }else{
            dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
        }
        int swipeFlag = 0;
        return makeMovementFlags(dragFlags,swipeFlag);
    }

    @Override
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder,
                          RecyclerView.ViewHolder target) {

        recyclerView_add_adapter.onMove(viewHolder.getAdapterPosition(),
                target.getAdapterPosition());

        return true;
    }

    @Override
    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {

    }
}

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利用OnItemTouchListener实现对RecyclerViewItem的点击：

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;

/**
 * Created by lwp940118 on 2016/12/2.
 */
public class RecyclerViewAddItemOnClickListener implements RecyclerView.OnItemTouchListener{


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

    private OnItemClickListener onItemClickListener;
    private GestureDetector gestureDetector;

    public RecyclerViewAddItemOnClickListener(Context context, final RecyclerView recyclerView,
                                              OnItemClickListener onItemClickListener){
        this.onItemClickListener = onItemClickListener;
        gestureDetector = new GestureDetector(context,new GestureDetector.SimpleOnGestureListener(){
            @Override
            public void onLongPress(MotionEvent e) {
                super.onLongPress(e);
            }

            @Override
            public boolean onSingleTapUp(MotionEvent e) {
                return true;
            }
        });
    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
        View view = rv.findChildViewUnder(e.getX(),e.getY());
        if (view != null && onItemClickListener != null && gestureDetector.onTouchEvent(e)
                && rv.getChildPosition(view) > 1){
            onItemClickListener.onItemCilck(view,rv.getChildPosition(view));
        }
        return false;
    }

    @Override
    public void onTouchEvent(RecyclerView rv, MotionEvent e) {

    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

    }

}

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为了实现今日头条的频道选择效果所以在Item的点击之后会出现Item的移动，为了简单、方便的实现该效果，我没有重写View的动画，而是利用RecyclerView的增加和删除代替View的移动效果。因此在Item的点击事件中需要出现Item的增加和删除逻辑操作，进而就产生了一个处理RecyclerView的增加删除类。代码如下：

import java.util.List;

/**
 * Created by lwp940118 on 2016/12/2.
 */
public class RecyclerViewAddItemExchange {

    private int position;
    private RecyclerView_Add_Adapter recyclerView_add_adapter;
    private List<AddPinDao> addPinDaos;

    public RecyclerViewAddItemExchange(int position,
                                       RecyclerView_Add_Adapter recyclerView_add_adapter,
                                       List<AddPinDao> addPinDaos){
        this.position = position;
        this.recyclerView_add_adapter = recyclerView_add_adapter;
        this.addPinDaos = addPinDaos;
        itemExchange();
    }

    private void itemExchange(){
        AddPinDao addPinDao = addPinDaos.get(position);
        int toposition = position ;
        if (addPinDao.getTag() == 1){
            for (int i = 2; i < addPinDaos.size(); i++){
                if (addPinDaos.get(i).getTag() == 3){
                    toposition = i;
                    break;
                }
            }
            addPinDao.setTag(3);
            addPinDaos.remove(position);
            recyclerView_add_adapter.notifyItemRemoved(position);
            addPinDaos.add(toposition - 1,addPinDao);
            recyclerView_add_adapter.notifyItemInserted(toposition - 1);
        }else if (addPinDao.getTag() == 3){
            addPinDaos.get(position).setTag(1);
            for (int i = 2; i < addPinDaos.size(); i++){
                if (addPinDaos.get(i).getTag() == 2){
                    toposition = i;
                    break;
                }
            }
            addPinDao.setTag(1);
            addPinDaos.remove(position);
            recyclerView_add_adapter.notifyItemRemoved(position);
            addPinDaos.add(toposition,addPinDao);
            recyclerView_add_adapter.notifyItemInserted(toposition);
        }
    }

}

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对于数据对象的定义：

/**
 * recyclerview 的item的 频道汉字列表D的类
 * Created by lwp940118 on 2016/11/28.
 */
public class AddPinDao {

    private String message;
    private int tag;
    private int myTag;

    public int getMyTag() {
        return myTag;
    }

    public void setMyTag(int myTag) {
        this.myTag = myTag;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public int getTag() {
        return tag;
    }

    public void setTag(int tag) {
        this.tag = tag;
    }
}

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Activity的代码实现：

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.util.Log;
import android.view.View;
import android.widget.ImageButton;

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

public class MainActivity extends Activity implements View.OnClickListener{

    private ImageButton imageButton_add_back;
    private RecyclerView recyclerView_add;
    private RecyclerView_Add_Adapter recyclerView_add_adapter = null;
    private List<AddPinDao> addPinDaos = new ArrayList<AddPinDao>();
    private RecyclerViewAddItemCallBackListener recyclerViewAddItemCallBackListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initData();
        initView();
    }

    private void initData(){
        for (int i = 0 ; i < 4;i++){
            if (i == 1){
                for (int t = 0 ; t < 20;t++){
                    AddPinDao addPinDao = new AddPinDao();
                    addPinDao.setTag(1);
                    addPinDao.setMessage("首页"+t);
                    addPinDao.setMyTag(0);
                    addPinDaos.add(addPinDao);
                }
            }
            AddPinDao addPinDao = new AddPinDao();
            addPinDao.setTag(i);
            addPinDao.setMessage("wq"+i);
            addPinDao.setMyTag(0);
            addPinDaos.add(addPinDao);
        }

        for (int i = 0 ; i < 30;i++){
            AddPinDao addPinDao = new AddPinDao();
            addPinDao.setTag(3);
            addPinDao.setMessage("wq"+i);
            addPinDao.setMyTag(0);
            addPinDaos.add(addPinDao);
        }

    }

    private void initView(){
        imageButton_add_back = (ImageButton)findViewById(R.id.imagebutton_add_back);
        imageButton_add_back.setOnClickListener(this);
        recyclerView_add = (RecyclerView)findViewById(R.id.recylerView_add);
        if (recyclerView_add_adapter == null){
            recyclerView_add_adapter = new RecyclerView_Add_Adapter(addPinDaos,this);
        }
        GridLayoutManager gridLayoutManager = new
                GridLayoutManager(this.getApplicationContext(),4);
        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                AddPinDao addPinDao = addPinDaos.get(position);
                if (addPinDao.getTag() == 0 || addPinDao.getTag() == 2){
                    return 4;
                }else {
                    return 1;
                }
            }
        });
        recyclerView_add.setLayoutManager(gridLayoutManager);
        recyclerView_add.setAdapter(recyclerView_add_adapter);
        recyclerView_add.setItemAnimator(new DefaultItemAnimator());
        ItemTouchHelper.Callback callback = new OnItemCallbackHelper(recyclerView_add_adapter);
        ItemTouchHelper itemTouchHelper = new ItemTouchHelper(callback);
        itemTouchHelper.attachToRecyclerView(recyclerView_add);
        recyclerView_add.addOnItemTouchListener(new RecyclerViewAddItemOnClickListener(
                getApplicationContext(),recyclerView_add,new RecyclerViewAddItemOnClickListener
                .OnItemClickListener(){
            @Override
            public void onItemCilck(View view, int position) {
                Log.e("---","点击了"+position);
                RecyclerViewAddItemExchange recyclerViewAddItemExchange = new
                        RecyclerViewAddItemExchange(position,recyclerView_add_adapter,addPinDaos);
            }
        }));
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.imagebutton_add_back:

                break;
        }
    }

}

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然后就是 各个XML的布局文件，
activity的xml为：

<?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"
    android:background="@color/dibu">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="49dp"
        android:orientation="horizontal">
        <TextView
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_marginLeft="10dp"
            android:layout_gravity="center"/>
        <TextView
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="频道选择"
            android:textSize="20sp"
            android:textColor="@color/radiobutton"
            android:gravity="center"/>
        <ImageButton
            android:id="@+id/imagebutton_add_back"
            android:layout_width="25dp"
            android:layout_height="25dp"
            android:layout_marginRight="10dp"
            android:layout_gravity="center"
            android:background="@mipmap/quxiao"/>
    </LinearLayout>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recylerView_add"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="5dp"
        android:background="@color/dibu">

    </android.support.v7.widget.RecyclerView>

</LinearLayout>

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四个Item的界面布局分别为：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:layout_margin="5dp"
    android:background="@color/dibu">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="40dp"
        android:gravity="left|center"
        android:layout_marginLeft="5dp"
        android:text="我的频道"
        android:textSize="16sp"
        android:textColor="#0b0b0b"/>
    <TextView
        android:id="@+id/textview_recyclerview_add_item_one_tuodong"
        android:layout_width="0dp"
        android:layout_height="40dp"
        android:layout_weight="1"
        android:gravity="left|center"
        android:textSize="12sp"
        android:layout_marginLeft="5dp"
        android:text=""
        android:textColor="#bababa"/>
    <TextView
        android:id="@+id/textview_recyclerview_add_item_one"
        android:layout_width="60dp"
        android:layout_height="26dp"
        android:textColor="@color/radiobuttonzhong"
        android:gravity="center"
        android:text="编 辑"
        android:layout_marginRight="10dp"
        android:background="@drawable/textview_background_read"
        android:textSize="16sp"/>
</LinearLayout>

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<?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="30dp"
    android:layout_margin="5dp">
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:id="@+id/textview_recyelerview_add_item_my"
            android:layout_width="match_parent"
            android:layout_height="30dp"
            android:gravity="center"
            android:textSize="14sp"
            android:text="News"
            android:background="@color/baise"/>
        <ImageView
            android:id="@+id/imageView_recyclerview_add_itme_my"
            android:layout_width="10dp"
            android:layout_height="10dp"
            android:background="@mipmap/shanchu"
            android:layout_gravity="right"/>
    </FrameLayout>
</LinearLayout>

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:layout_margin="5dp"
    android:background="@color/dibu">
    <TextView
        android:id="@+id/textview_recyelerview_add_item_pindao"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="40dp"
        android:gravity="left|center"
        android:layout_marginLeft="5dp"
        android:text="推荐频道"
        android:textSize="16sp"
        android:textColor="#087bf7"/>
</LinearLayout>

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<?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="30dp"
    android:layout_margin="5dp"
    android:background="@color/dibu">
    <TextView
        android:id="@+id/textview_recyelerview_add_item_pindao"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:gravity="center"
        android:textSize="14sp"
        android:text="News"
        android:background="@color/colorAccent"/>
</LinearLayout>

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到此已经全部实现，仿今日头条的频道选择器。RecyclerViewItem的交换点击增加删除复杂布局。

--------------------- 本文来自 xy_liwp 的优快云 博客 ，全文地址请点击：https://blog.youkuaiyun.com/qq_30000411/article/details/53436523?utm_source=copy