仿新闻类实现滑动选择标签（二）

通过RecyclerView结合ItemTouchHelper实现拖动改变位置功能。



标签页面主要逻辑，第一个项目不变，前一界面选择所在的标签位置，跳转到本界面，用红色文字表示，推荐栏目中，显示定制栏目不存在的栏目，删除定制栏目，添加到推荐栏目中，点击推荐栏目，将点击项加入定制栏目中，并且在推荐栏目中删除，拖动改变顺序或者添加删除后，回到前一界面，更改前一界面的标签和界面，并且定位在选中标签对应的页面。长按显示叉号

相关类：主界面

ColumnCustomizationActivity.java

public class ColumnCustomizationActivity extends BaseCompatActivity implements MyItemTouchCallback.OnDragListener
{

@BindView(R.id.toolbar_title)
TextView toolbarTitle;
@BindView(R.id.recyclerview_already)
RecyclerView recyclerviewAlready;
@BindView(R.id.recyclerview_recommend)
RecyclerView recyclerviewRecommend;
@BindView(R.id.back)
ImageView ivBack;
@BindView(R.id.tv_edit)
TextView tvEdit;

private List<ArticleBean> articleBeanList = new ArrayList<>();
private List<ArticleBean> articleBeanList2 = new ArrayList<>();

private RecyclerAdapter adapterAlready;
private RecyclerAdapter adapterAll;

private int selectPosition = 0;//与前一页对应，选中的标签

public static String SELECT_COLUMN = "SELECT_COLUMN";
public static String SELECT_COLUMN_INDEX = "SELECT_COLUMN_INDEX";
private static String SELECT_PARAM = "select_column";
private static String SELECT_PARAM_LIST = "select_column_list";
public static void startForResult(Activity context, int selectPosition,ArrayList<ArticleBean> articleBeanArrayList, int requestCode)
{
Intent intent = new Intent();
intent.setClass(context, ColumnCustomizationActivity.class);
intent.putExtra(SELECT_PARAM, selectPosition);
intent.putExtra(SELECT_PARAM_LIST, articleBeanArrayList);
intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
context.startActivityForResult(intent, requestCode);
}

@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_column_customization);
ButterKnife.bind(this);
ivBack.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
finish();
}
});

Intent intent = getIntent();
if (intent != null)
{
selectPosition = intent.getIntExtra(SELECT_PARAM, 0);
articleBeanList= (List<ArticleBean>) intent.getSerializableExtra(SELECT_PARAM_LIST);
}
if(articleBeanList==null){
articleBeanList=new ArrayList<>();
}

setUpRecyclerviewAlready();
setUpRecyclerviewRecommend();

//调用推荐栏目接口
getListArticleMainClass();

tvEdit.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
if (adapterAlready != null)
{
UpdateCustom();
}
}
});
}

/**
* 设置已选栏目
*/
private void setUpRecyclerviewAlready()
{
adapterAlready = new RecyclerAdapter(R.layout.drag_item_layout, articleBeanList, false, ColumnCustomizationActivity.this, selectPosition);
recyclerviewAlready.setHasFixedSize(true);
recyclerviewAlready.setAdapter(adapterAlready);
recyclerviewAlready.setNestedScrollingEnabled(false);
//防止滑动卡顿
GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 3)
{
@Override
public boolean canScrollVertically()
{
return false;
}
};
recyclerviewAlready.setLayoutManager(gridLayoutManager);
int spanCount = 3;//跟布局里面的spanCount属性是一致的
int spacing = 10;//每一个矩形的间距
boolean includeEdge = true;//如果设置成false那边缘地带就没有间距
//设置每个item间距
recyclerviewAlready.addItemDecoration(new GridSpacingItemDecoration(spanCount, spacing, includeEdge));
final ItemTouchHelper itemTouchHelper = new ItemTouchHelper(new MyItemTouchCallback(adapterAlready).setOnDragListener(this));
itemTouchHelper.attachToRecyclerView(recyclerviewAlready);

recyclerviewAlready.addOnItemTouchListener(new OnRecyclerItemClickListener(recyclerviewAlready)
{
@Override
public void onLongClick(RecyclerView.ViewHolder vh)
{
tvEdit.setVisibility(View.VISIBLE);
adapterAlready.doStartEditMode(recyclerviewAlready);
adapterAlready.setShowImage(true);
if(vh.getAdapterPosition()==0){//第一项不操作
return;
}
itemTouchHelper.startDrag(vh);
}

@Override
public void onItemClick(final RecyclerView.ViewHolder vh)
{
adapterAlready.setmAdapterInterface(new RecyclerAdapter.adapterInterface()
{
@Override
public void imageViewClick()
{

try
{
articleBeanList2.add(articleBeanList.get(vh.getLayoutPosition()));
adapterAll.notifyDataSetChanged();
//点击删除按钮，如果选中的索引比剩余数据的长度大，将选中索引设置为最后一项
if (selectPosition == articleBeanList.size() - 1)
{
selectPosition--;
if (selectPosition <= 0)
{
selectPosition = 0;
}
}
articleBeanList.remove(vh.getLayoutPosition());
adapterAlready.setSelectPosition(selectPosition);
adapterAlready.notifyDataSetChanged();
}catch (Exception e){
e.printStackTrace();
}
}

@Override
public void itemViewClick()
{
try
{
selectPosition = vh.getLayoutPosition();//设置选中的项目
adapterAlready.setSelectPosition(selectPosition);
adapterAlready.notifyDataSetChanged();
}catch (Exception e){
e.printStackTrace();
}
}
});

// Toast.makeText(getActivity(),item.getId()+" "+item.getName(),Toast.LENGTH_SHORT).show();
}
});
}

/**
* 设置推荐栏目
*/
private void setUpRecyclerviewRecommend()
{
adapterAll = new RecyclerAdapter(R.layout.drag_item_layout, articleBeanList2, false, ColumnCustomizationActivity.this, -1);
recyclerviewRecommend.setHasFixedSize(true);
recyclerviewRecommend.setAdapter(adapterAll);
recyclerviewRecommend.setNestedScrollingEnabled(false);
//防止滑动卡顿
GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 3)
{
@Override
public boolean canScrollVertically()
{
return false;
}
};
recyclerviewRecommend.setLayoutManager(gridLayoutManager);

int spanCount = 3;//跟布局里面的spanCount属性是一致的
int spacing = 10;//每一个矩形的间距
boolean includeEdge = true;//如果设置成false那边缘地带就没有间距
//设置每个item间距
recyclerviewRecommend.addItemDecoration(new GridSpacingItemDecoration(spanCount, spacing, includeEdge));
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(new MyItemTouchCallback(adapterAll).setOnDragListener(this));
itemTouchHelper.attachToRecyclerView(recyclerviewRecommend);

recyclerviewRecommend.addOnItemTouchListener(new OnRecyclerItemClickListener(recyclerviewAlready)
{
@Override
public void onLongClick(RecyclerView.ViewHolder vh)
{

}

@Override
public void onItemClick(final RecyclerView.ViewHolder vh)
{
try
{
//点击推荐栏目，加入到定制栏目组内,本栏目在推荐栏目组里删除，
articleBeanList.add(articleBeanList2.get(vh.getLayoutPosition()));
adapterAlready.notifyDataSetChanged();
articleBeanList2.remove(vh.getLayoutPosition());
adapterAll.notifyDataSetChanged();
}catch (Exception e){
e.printStackTrace();
}
}
});
}

@Override
public void onFinishDrag()
{

}

/**
* 所有栏目
*/
public void getListArticleMainClass()
{

String url = Contants.APIURL.GET_LISTARTICLEMAINCLASS.getUrl();

RequestEntity<String> entity = new RequestEntity<>();

OkHttpUtils.get().url(url).headers(entity.getHeader()).build().execute(new JsonCallBack<ResponseEntity<ArrayList<ArticleBean>>>()
{
@Override
public void onError(Call call, Exception e, RequestCall requestCall)
{
ToastUtil.showLongToast("网络异常，请稍后尝试");
}

@Override
public void onResponse(ResponseEntity<ArrayList<ArticleBean>> data, RequestCall requestCall)
{
if (data.isOK())
{
articleBeanList2.clear();
//遍历数据，将已有的栏目筛选掉
for (ArticleBean bean : data.getRstData())
{
boolean isExist = false;//是否已存在栏目
for (ArticleBean bean1 : articleBeanList)
{
if (bean.getId().equals(bean1.getId()))
{
isExist = true;
}
}
if (!isExist)
{//不存在，添加
articleBeanList2.add(bean);
}
}
adapterAll.notifyDataSetChanged();
}
else
{
ToastUtil.showLongToast(data.getErrorMsg());
}
}
});
}

/**
* 更新栏目
*/
private void UpdateCustom()
{
showProgressDialog("请稍候", null, null);
ArrayList<UpdateCustomBean> arrayList = new ArrayList<>();
for (ArticleBean bean : articleBeanList)
{
UpdateCustomBean updateCustomBean = new UpdateCustomBean();
updateCustomBean.setName(bean.getName());
updateCustomBean.setSN(bean.getSN());
updateCustomBean.setCitizenId("" + UserSession.getInstance().getUserInfo().getUserId());
updateCustomBean.setClassId(bean.getId());
arrayList.add(updateCustomBean);
}

RequestEntity<ArrayList<UpdateCustomBean>> entity = new RequestEntity<>();
entity.setReqData(arrayList);

OkHttpUtils.postString().url(Contants.APIURL.GET_UPDATECUSTOM.getUrl()).headers(entity.getHeader())
//.mediaType(entity.getMediaType())
.content(entity.getBody()).build().execute(new JsonCallBack<ResponseEntity<String>>()
{
@Override
public void onError(Call call, Exception e, RequestCall requestCall)
{
dismissProgressDialog();
ToastUtil.showLongToast("服务器繁忙，请稍后尝试。");
}

@Override
public void onResponse(ResponseEntity<String> data, RequestCall requestCall)
{
dismissProgressDialog();

if (data.isOK())
{
selectPosition = adapterAlready.getSelectPosition();
Intent mIntent = new Intent();
mIntent.putExtra(SELECT_COLUMN, (Serializable) articleBeanList);
mIntent.putExtra(SELECT_COLUMN_INDEX, selectPosition);
ColumnCustomizationActivity.this.setResult(RESULT_OK, mIntent);
finish();
}
else
{
ToastUtil.showLongToast(data.getErrorMsg());
}
}
});
}

}

activity_column_customization.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff">
<LinearLayout

android:layout_width="match_parent" android:layout_height="match_parent"
android:background="#ffffff"
android:orientation="vertical">

<RelativeLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp">
<ImageView
android:id="@+id/back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/close_new"
android:layout_gravity="center"
android:padding="10dp"
android:layout_centerVertical="true"
/>

<TextView
android:id="@+id/toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textSize="@dimen/statebar_title_size"
android:textColor="@color/color_black_111111"
android:text="栏目定制"/>

<TextView
android:id="@+id/tv_edit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp"
android:textColor="@color/color_black_111111"
android:text="完成"
android:visibility="invisible"
android:padding="10dp"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
/>

</RelativeLayout>
<View
android:id="@+id/view_divider"
android:layout_width="match_parent"
android:layout_height="2dp"
android:background="@color/color_gray_f4f4f4"/>
<RelativeLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp"
android:textColor="@color/black"
android:text="已选栏目"/>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp"
android:textColor="@color/color_gray_999999"
android:text="按住拖动调整排序"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"/>

</RelativeLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerview_already"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"/>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp"
android:textColor="@color/black"
android:text="推荐栏目"
android:layout_margin="10dp"/>
<View
android:layout_width="match_parent"
android:layout_height="2dp"
android:background="@color/color_gray_f4f4f4"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerview_recommend"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"/>

</LinearLayout>
</android.support.v4.widget.NestedScrollView>

drag_item_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="110dp"
android:layout_height="60dp"
android:background="@color/white"
android:id="@+id/fragment"
>

<TextView
android:id="@+id/tv_drag"
android:layout_width="90dp"
android:layout_height="40dp"
android:gravity="center"
android:layout_margin="10dp"
android:text="测试测试"
android:background="@drawable/rect_solid_and_stroke_gray2_corner_5dp"
android:textColor="@color/black"/>

<ImageView
android:id="@+id/iv_x"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:src="@drawable/delete_new"

/>

</FrameLayout>

MyItemTouchCallback.java

public class MyItemTouchCallback extends ItemTouchHelper.Callback {

private ItemTouchAdapter itemTouchAdapter;
public MyItemTouchCallback(ItemTouchAdapter itemTouchAdapter){
this.itemTouchAdapter = itemTouchAdapter;
}

@Override
public boolean isLongPressDragEnabled() {
return true;
}

@Override
public boolean isItemViewSwipeEnabled() {
return true;
}

@Override
public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
if (recyclerView.getLayoutManager() instanceof GridLayoutManager) {
final int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
final int swipeFlags = 0;
return makeMovementFlags(dragFlags, swipeFlags);
} else {
final int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
//final int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
final int swipeFlags = 0;
return makeMovementFlags(dragFlags, swipeFlags);
}
}

@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
int fromPosition = viewHolder.getAdapterPosition();//得到拖动ViewHolder的position
int toPosition = target.getAdapterPosition();//得到目标ViewHolder的position
itemTouchAdapter.onMove(fromPosition,toPosition);
return true;
}

@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
int position = viewHolder.getAdapterPosition();
itemTouchAdapter.onSwiped(position);
}

@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
//滑动时改变Item的透明度
final float alpha = 1 - Math.abs(dX) / (float) viewHolder.itemView.getWidth();
viewHolder.itemView.setAlpha(alpha);
viewHolder.itemView.setTranslationX(dX);
} else {
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
}

@Override
public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
/* if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
if (background == null && bkcolor == -1) {
Drawable drawable = viewHolder.itemView.getBackground();
if (drawable == null) {
bkcolor = 0;
} else {
background = drawable;
}
}
viewHolder.itemView.setBackgroundColor(Color.LTGRAY);
}*/

if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
if (background == null && bkcolor == -1) {
Drawable drawable = viewHolder.itemView.getBackground();
if (drawable == null) {
bkcolor = 0;
} else {
background = drawable;
}
}
viewHolder.itemView.setBackgroundColor(Color.TRANSPARENT);
}

super.onSelectedChanged(viewHolder, actionState);
}

@Override
public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
super.clearView(recyclerView, viewHolder);

/*viewHolder.itemView.setAlpha(1.0f);
if (background != null) viewHolder.itemView.setBackgroundDrawable(background);
if (bkcolor != -1) viewHolder.itemView.setBackgroundColor(bkcolor);*/
//viewHolder.itemView.setBackgroundColor(0);

if (onDragListener!=null){
onDragListener.onFinishDrag();
}
}

private Drawable background = null;
private int bkcolor = -1;

private OnDragListener onDragListener;
public MyItemTouchCallback setOnDragListener(OnDragListener onDragListener) {
this.onDragListener = onDragListener;
return this;
}
public interface OnDragListener{
void onFinishDrag();
}

public interface ItemTouchAdapter {
void onMove(int fromPosition, int toPosition);
void onSwiped(int position);
}
}

RecyclerAdapter.java

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.MyViewHolder> implements MyItemTouchCallback.ItemTouchAdapter
{

private Context context;
private int src;
private List<ArticleBean> results;
private boolean isShowImage = false;
private adapterInterface mAdapterInterface;
private int selectPosition = 0;//已选择栏目的位置

public RecyclerAdapter(int src, List<ArticleBean> results, boolean isShowImage, Context context, int selectPosition)
{
this.results = results;
this.src = src;
this.isShowImage = isShowImage;
this.context = context;
this.selectPosition = selectPosition;
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
this.context = parent.getContext();
View itemView = LayoutInflater.from(parent.getContext()).inflate(src, parent, false);
return new MyViewHolder(itemView);
}

public void setSelectPosition(int selectPosition)
{
this.selectPosition = selectPosition;
}

@Override
public void onBindViewHolder(final MyViewHolder holder, int position)
{
holder.textView.setText(results.get(position).getName());
if (position == 0&&selectPosition!=0&&selectPosition!=-1)//第一项，如果没选中，并且不等于-1(-1用来区分推荐栏目)，改变颜色
{//第一项颜色不同，不显示删除图标
holder.imageView.setVisibility(View.INVISIBLE);
holder.textView.setTextColor(context.getResources().getColor(R.color.color_gray_999999));
}
else
{
if (position == selectPosition)
{//改变已选中项目背景颜色和字体颜色
//  holder.textView.setBackgroundResource(R.drawable.rect_solid_and_stroke_red_corner_5dp);
holder.textView.setTextColor(Color.RED);
}
else
{
holder.textView.setBackgroundResource(R.drawable.rect_solid_and_stroke_gray2_corner_5dp);
holder.textView.setTextColor(Color.BLACK);
}

if (isShowImage)
{
holder.imageView.setVisibility(View.VISIBLE);
}
else
{
holder.imageView.setVisibility(View.INVISIBLE);
}
holder.imageView.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
if (mAdapterInterface != null)
{
mAdapterInterface.imageViewClick();
}
}
});

}

//显示删除按钮，可以点击
if(isShowImage){
holder.fragment.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
if (mAdapterInterface != null)
{
mAdapterInterface.itemViewClick();
}
}
});
}

}

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

@Override
public void onMove(int fromPosition, int toPosition)
{
if (fromPosition == 0 || toPosition == 0)
{//第一个不可拖动
return;
}
if (fromPosition < toPosition)
{
for (int i = fromPosition; i < toPosition; i++)
{
Collections.swap(results, i, i + 1);
}
}
else
{
for (int i = fromPosition; i > toPosition; i--)
{
Collections.swap(results, i, i - 1);
}
}
notifyItemMoved(fromPosition, toPosition);
if(fromPosition==selectPosition){//拖动的初始位置是选中项
selectPosition=toPosition;
}
}

public int getSelectPosition()
{
return selectPosition;
}

@Override
public void onSwiped(int position)
{
results.remove(position);
notifyItemRemoved(position);
}

public class MyViewHolder extends RecyclerView.ViewHolder
{

public TextView textView;
public ImageView imageView;
public FrameLayout fragment;

public MyViewHolder(View itemView)
{
super(itemView);
/*  WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
int width = wm.getDefaultDisplay().getWidth();
ViewGroup.LayoutParams layoutParams = itemView.getLayoutParams();
layoutParams.height = width/6;
itemView.setLayoutParams(layoutParams);*/
textView = (TextView) itemView.findViewById(R.id.tv_drag);
imageView = (ImageView) itemView.findViewById(R.id.iv_x);
fragment = (FrameLayout) itemView.findViewById(R.id.fragment);
}
}

public void setShowImage(boolean showImage)
{
isShowImage = showImage;
}
public void doStartEditMode(RecyclerView parent) {
//遍历子控件，将叉号图标显示
int visibleChildCount = parent.getChildCount();
for (int i = 0; i < visibleChildCount; i++) {
View view = parent.getChildAt(i);
ImageView imgEdit = (ImageView) view.findViewById(R.id.iv_x);
imgEdit.setVisibility(View.VISIBLE);
}
}

public boolean isShowImage()
{
return isShowImage;
}

public void setmAdapterInterface(adapterInterface mAdapterInterface)
{
this.mAdapterInterface = mAdapterInterface;
}

public interface adapterInterface
{
public void imageViewClick();

public void itemViewClick();//子item点击事件
}
}

OnRecyclerItemClickListener.java

public class OnRecyclerItemClickListener implements RecyclerView.OnItemTouchListener{
private GestureDetectorCompat mGestureDetector;
private RecyclerView recyclerView;

public OnRecyclerItemClickListener(RecyclerView recyclerView){
this.recyclerView = recyclerView;
mGestureDetector = new GestureDetectorCompat(recyclerView.getContext(),new ItemTouchHelperGestureListener());
}

@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
mGestureDetector.onTouchEvent(e);
return false;
}

@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
mGestureDetector.onTouchEvent(e);
}

@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

}

private class ItemTouchHelperGestureListener extends GestureDetector.SimpleOnGestureListener {

@Override
public boolean onSingleTapUp(MotionEvent e) {
View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
if (child!=null) {
RecyclerView.ViewHolder vh = recyclerView.getChildViewHolder(child);
onItemClick(vh);
}
return true;
}

@Override
public void onLongPress(MotionEvent e) {
View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
if (child!=null) {
RecyclerView.ViewHolder vh = recyclerView.getChildViewHolder(child);
onLongClick(vh);
}
}
}

public void onLongClick(RecyclerView.ViewHolder vh){}
public void onItemClick(RecyclerView.ViewHolder vh){}
}

参考文献：

android开发游记：ItemTouchHelper 使用RecyclerView打造可拖拽的GridView