RecyclerView实现流式标签单选多选功能

  //瀑布流LayoutManager
  implementation 'com.google.android:flexbox:1.0.0' 
  //RecyclerView
  implementation 'com.android.support:design:28.0.0'

public static Set<Integer> positionSet = new HashSet<>(); //用于存储选择的位置
  private boolean selectMode = true; //选择模式 多选或者单选 true 多选
  public Set<String> checkTYpeNameSet = new HashSet<>(); //用于存储选择项的名称

 mRecyclerView = (RecyclerView) findViewById(R.id.recycler);
    FlexboxLayoutManager manager = new FlexboxLayoutManager(this, FlexDirection.ROW, FlexWrap.WRAP){
      @Override
      public boolean canScrollVertically() {
        return false;
      }
    };
    mRecyclerView.setLayoutManager(manager);

mAdapter.setOnItemClickListener(new OnItemClickListener() {
      @Override
      public void OnItemClick(View view, int position) {
        addOrRemove(position);
      }
      @Override
      public void OnItemLongClick(View view, int position) {
      }
    });
 private void addOrRemove(int position) {
    if (positionSet.contains(position)) {
      // 如果包含，则撤销选择
      positionSet.remove(position);
      checkTYpeNameSet.remove(mListData.get(position).getTagName());
    } else {
      // 如果不包含，则添加
      positionSet.add(position);
      checkTYpeNameSet.add(mListData.get(position).getTagName());
    }
    if (positionSet.size() == 0) {
      // 如果没有选中任何的item，则退出多选模式
      mAdapter.notifyDataSetChanged();
      selectMode = false;
    } else {
      // 更新列表界面，否则无法显示已选的item
      mAdapter.notifyDataSetChanged();
    }
    Log.e("info",positionSet.toString());
    Toast.makeText(MultipleChoiceActivity.this,checkTYpeNameSet.toString(),Toast.LENGTH_SHORT).show();
  }

public class MultipleRecyclerAdapter extends RecyclerView.Adapter<MultipleRecyclerAdapter.ViewHolder> {
  private Context mContext;
  private List<TestBean> mListData = new ArrayList<>();
  private OnItemClickListener mOnItemClickListener;
  public void setOnItemClickListener(OnItemClickListener mOnItemClickListener) {
    this.mOnItemClickListener = mOnItemClickListener;
  }
  public MultipleRecyclerAdapter(Context mContext, List<TestBean> mListData) {
   // mListData = new ArrayList<>();
    this.mContext = mContext;
    this.mListData = mListData;
  }
  public void update(List<TestBean> list){
    if(list != null && list.size() > 0){
      mListData.addAll(list);
      notifyDataSetChanged();
    }
  }
  class ViewHolder extends RecyclerView.ViewHolder{
    TextView typeTv;
    CheckableLayout rootLayout;
    public ViewHolder(@NonNull View itemView) {
      super(itemView);
      typeTv = (TextView) itemView.findViewById(R.id.alive_type_tv);
      rootLayout = (CheckableLayout) itemView.findViewById(R.id.root_layout);
    }
  }
  @NonNull
  @Override
  public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    if(mContext == null){
      mContext = viewGroup.getContext();
    }
    View view = LayoutInflater.from(mContext).inflate(R.layout.item_recycler,viewGroup,false);
    return new ViewHolder(view);
  }
  @Override
  public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {
    Set<Integer> positionSet = MultipleChoiceActivity.positionSet;
    //检查set里是否包含position，包含则显示选中的背景色，不包含则反之
    if (positionSet.contains(position)) {
      holder.rootLayout.setChecked(true);
      holder.typeTv.setTextColor(mContext.getResources().getColor(R.color.white));
    } else {
      holder.rootLayout.setChecked(false);
      holder.typeTv.setTextColor(mContext.getResources().getColor(R.color.grey_60));
    }
    TestBean bean = mListData.get(position);
    holder.typeTv.setText(bean.getTagName());
    if(mOnItemClickListener != null) {
      holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
          int pos = holder.getLayoutPosition();
          mOnItemClickListener.OnItemClick(holder.itemView, pos);
          holder.rootLayout.setChecked(true);
        }
      });
    }
  }
  @Override
  public int getItemCount() {
    return mListData != null ? mListData.size() : 0;
  }
}

<?xml version="1.0" encoding="utf-8"?>
<com.lhx.flowtagdemo.recycler.CheckableLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_marginLeft="8dp"
  android:layout_marginTop="6dp"
  android:id="@ id/root_layout"
  android:background="@drawable/type_select_bg_color"
  xmlns:tools="http://schemas.android.com/tools">
  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:paddingRight="18dp"
    android:paddingLeft="18dp"
    android:gravity="center"
    android:textSize="14sp"
    tools:text="医药"
    android:id="@ id/alive_type_tv"
    android:textColor="#60000000"
    android:paddingBottom="10dp"
    android:paddingTop="10dp" />
</com.lhx.flowtagdemo.recycler.CheckableLayout>

public class CheckableLayout extends RelativeLayout implements Checkable {
  private static final int[] CHECKED_STATE_SET = {android.R.attr.state_checked};
  private boolean mChecked;
  public CheckableLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
  }
  @Override
  public void setChecked(boolean b) {
    if (b != mChecked){
      mChecked = b;
      refreshDrawableState();
    }
  }
  @Override
  public boolean isChecked() {
    return mChecked;
  }
  @Override
  public void toggle() {
    setChecked(!mChecked);
  }
  @Override
  protected int[] onCreateDrawableState(int extraSpace) {
    final int[] drawableState = super.onCreateDrawableState(extraSpace   1);
    if (isChecked()) mergeDrawableStates(drawableState, CHECKED_STATE_SET);
    return drawableState;
  }
}

public static Set<Integer> positionSet = new HashSet<>();
  private boolean selectMode = false; //选择模式 多选或者单选 true 多选

mAdapter.setOnItemClickListener(new OnItemClickListener() {
      @Override
      public void OnItemClick(View view, int position) {
        if (selectMode) {
          // 如果当前处于多选状态，则进入多选状态的逻辑
          // 维护当前已选的position
          addOrRemove(position);
        } else {
          // 如果不是多选状态，则进入单选事件的业务逻辑
          if (!positionSet.contains(position)) {
            // 选择不同的单位时取消之前选中的单位
            positionSet.clear();
          }
          addOrRemove(position);
        }
        String kindName = mListData.get(position).getTagName();
        Toast.makeText(SingleChoiceActivity.this, kindName, Toast.LENGTH_SHORT).show();
      }
      @Override
      public void OnItemLongClick(View view, int position) {
      }
    });
 private void addOrRemove(int position) {
    if (positionSet.contains(position)) {
      // 如果包含，则撤销选择
      positionSet.remove(position);
    } else {
      // 如果不包含，则添加
      positionSet.add(position);
    }
    if (positionSet.size() == 0) {
      // 如果没有选中任何的item，则退出多选模式
      mAdapter.notifyDataSetChanged();
      selectMode = false;
    } else {
      // 更新列表界面，否则无法显示已选的item
      mAdapter.notifyDataSetChanged();
    }
  }