RecyclerView复选框/各种展示/分割线

public class MainActivity extends AppCompatActivity {
    private RecyclerView recy;
    private LinearLayoutManager manager;
    private GridLayoutManager gridLayoutManager;
    private StaggeredGridLayoutManager staggeredGridLayoutManager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recy = (RecyclerView) findViewById(R.id.recy);
        //listview的形式展示
        manager = new LinearLayoutManager(this);
        //gridview的形式展示,可以通过setSpanSizeLookup 来自定义每个item占的列数
        gridLayoutManager = new GridLayoutManager(this,3);
        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                return 3-position%3;
            }
        });
        //瀑布流的形式
        staggeredGridLayoutManager = new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL);
        recy.setLayoutManager(manager);
        final Myadapter myadapter=new Myadapter();
        recy.setAdapter(myadapter);
        myadapter.setOnItemClickListenr(new Myadapter.OnItemClickListenr() {
            @Override
            public void onItemclick(View v, int position) {
               // myadapter.add(position);
                myadapter.selectAll();
            }
        });
        myadapter.setOnItenmLongClickListenr(new Myadapter.OnItemLongClickListenr() {
            @Override
            public void onItemLongclick(View v, int position) {
               // myadapter.remove(position);
               // myadapter.update(position,"这是修改的");
                myadapter.backselect();
            }
        });
        recy.addItemDecoration(new MyDecoration(this,LinearLayoutManager.VERTICAL));
    }
    public void onClick(View view){
        //切换布局
        RecyclerView.LayoutManager layoutManager = recy.getLayoutManager();
        if (layoutManager==null){
            return;
        }
        if (layoutManager instanceof GridLayoutManager){
            recy.setLayoutManager(manager);
        }else if (layoutManager instanceof LinearLayoutManager){
            recy.setLayoutManager(gridLayoutManager);
        }
    }
}
Myadapater:
public class Myadapter extends RecyclerView.Adapter<Myadapter.MyViewholder>{
    private final ArrayList<String> list;
    private final HashMap<Integer, Boolean> map;
    public Myadapter(){
        list = new ArrayList<>();
        map = new HashMap<>();
        for (int i=0;i<30;i++)
        {
            list.add("条目"+i);
            map.put(i,false);
        }
    }
//创建布局和viewHolder
    @Override
    public MyViewholder onCreateViewHolder(ViewGroup parent, int viewType) {

        View inflate = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_view_item, parent,false);

        return new MyViewholder(inflate);
    }
    //绑定数据
    @Override
    public void onBindViewHolder(MyViewholder holder, final int position) {
        holder.title.setText(list.get(position));
//        if (position%2==1){
//            holder.icon.setImageResource(R.mipmap.ic_launcher);
//        }
        holder.icon.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mitemClickListenr!=null){
                    mitemClickListenr.onItemclick(v,position);
                }
            }
        });
        holder.icon.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                if (mitemLongClickListenr!=null){
                    mitemLongClickListenr.onItemLongclick(v,position);
                }
                return true;
            }
        });
        //针对ListView中checkBox错乱的问题,解决办法是只操作数据不操作checkBox,数据改变之后去刷新
        holder.checkBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                map.put(position,!map.get(position));
                notifyDataSetChanged();
                //单选框调用
                //danxuan(position);
            }
        });
        holder.checkBox.setChecked(map.get(position));
    }
    @Override
    public int getItemCount() {
        return list.size();
    }
    //增加的方法
    public void add(int postion){
//改变数据
        list.add(postion+1,"这是添加的");
        notifyItemRangeChanged(postion+1,getItemCount());
    }
    public void remove(int position){
        list.remove(position);
        notifyItemRangeRemoved(position,getItemCount());
    }
    public void update(int posiion,String content){
        list.remove(posiion);
        list.add(posiion,content);
        notifyItemChanged(posiion);
    }
    //全选
    public void selectAll(){
        Set<Map.Entry<Integer, Boolean>> entries = map.entrySet();
        //如果发现有没有选中的item,我就应该去全部选中,这个变量就应该设置成true,否则就是false
        boolean shouldSelectedAll=false;
        //这个for循环就是判断一下接下来要全部选中,还是全部不选中
        for (Map.Entry<Integer, Boolean> entry:entries) {
            Boolean value = entry.getValue();
            //如果有没选中的,那就去全部选中 ,如果发现全都选中了那就全部不选中,
            if (!value){
                shouldSelectedAll=true;
                break;
            }
        }
        //如果shouldSelectedAll为true说明需要全部选中,
        // 如果为false说明没有没有选中的,已经是是全部选中的状态,需要全部不选中
        for (Map.Entry<Integer, Boolean> entry:entries) {
            entry.setValue(shouldSelectedAll);
        }
        notifyDataSetChanged();
    }
    //反选
    public void backselect(){
        Set<Map.Entry<Integer, Boolean>> entries = map.entrySet();
        for (Map.Entry<Integer, Boolean> entry:entries) {
            entry.setValue(!entry.getValue());
        }
        notifyDataSetChanged();
    }
    //单选,点击checkBox的时候只选中当前的item,在checkBox的点击事件中调用
    public void danxuan(int position){
        Set<Map.Entry<Integer, Boolean>> entries = map.entrySet();
        for (Map.Entry<Integer, Boolean> entry:entries) {
            entry.setValue(false);
        }
        map.put(position,true);
        notifyDataSetChanged();
    }
    public class MyViewholder extends RecyclerView.ViewHolder{
        TextView title;
        ImageView icon;
        CheckBox checkBox;
        View itemView;
        //findviewById 给控件绑定id
        public MyViewholder(View itemView) {
            super(itemView);
            this.itemView=itemView;
            title = (TextView) itemView.findViewById(R.id.title);
           icon = (ImageView) itemView.findViewById(R.id.icon);
            checkBox = (CheckBox) itemView.findViewById(R.id.check);
        }
    }
    //单击事件监听
    public interface OnItemClickListenr{
        void onItemclick(View v,int position);
    }
    //长按事件监听
    public interface OnItemLongClickListenr{
        void onItemLongclick(View v,int position);
    }
    private OnItemClickListenr mitemClickListenr;
    private OnItemLongClickListenr mitemLongClickListenr;
    //设置单击事件的接口
    public void setOnItemClickListenr(OnItemClickListenr onItemClickListenr){
        mitemClickListenr=onItemClickListenr;
    }
    public void setOnItenmLongClickListenr(OnItemLongClickListenr onItenmLongClickListenr){
        mitemLongClickListenr=onItenmLongClickListenr;
    }
}
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
    };
MyDecoration: 
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+params.leftMargin, top, right-params.leftMargin, bottom);
            mDivider.draw(c);
        }
    }
    //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+params.topMargin, right, bottom-params.topMargin);
            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);
        }
    }
}
 drawable下：item:(为了画分割线)
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
<solid android:color="#ff00"/>
    <size android:height="2dp" android:width="2dp"/>
</shape>
styles:引用
<item name="android:listDivider">@drawable/item</item>
XML:activity
<android.support.v7.widget.RecyclerView
    android:id="@+id/recy"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    ></android.support.v7.widget.RecyclerView>
<Button
    android:onClick="onClick"
    android:layout_alignParentRight="true"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="切换布局" />