推薦：

• HashSet實現多選
• HashMap實現單選（HansMap的遍歷）

HashSet?實現多選，先看效果圖：

這是HashMap實現單選和HashSet實現多選的下載鏈接

下面是主要內容：

• MainActivity 主要代碼以及 activity_main 布局文件代碼

• MoreAdapter 主要代碼以及 adapter_more?布局文件代碼

1. MainActivity 主要代碼以及 activity_main 布局文件代碼

MainActivity 主要代碼：

import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.support.v7.widget.GridLayoutManager; import android.support.v7.widget.RecyclerView; import android.widget.Toast;import java.util.ArrayList; import java.util.HashSet; import java.util.List;/*** author: wu* date: on 2018/11/12.* describe:多選主 Activity*/ public class MainActivity extends AppCompatActivity {private List<String> list;private RecyclerView rv_more;private HashSet<Integer> hashSet = new HashSet<>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//列表中添加數據setList();//設置多選適配器setMore();}private void setList() {list = new ArrayList<>();list.add("英雄聯盟");list.add("王者榮耀");list.add("刺激戰場");list.add("絕地求生");list.add("第五人格");list.add("唱歌");list.add("聊天");list.add("全軍出擊");}private void setMore() {rv_more = findViewById(R.id.rv_more);MoreAdapter adapter = new MoreAdapter(this, list);rv_more.setAdapter(adapter);rv_more.setLayoutManager(new GridLayoutManager(this, 3));//adapter中item點擊事件adapter.setOnItemClickListerer(new MoreAdapter.OnItemClickListener() {@Overridepublic void onItemClick(int position, HashSet<Integer> set) {hashSet = set;Toast.makeText(MainActivity.this, setName(), Toast.LENGTH_SHORT).show();}});}//把列表用逗號隔開private String setName() {String listStr = "";for (Integer position : hashSet) {if (listStr.equals("")) {listStr = list.get(position);} else {listStr = listStr + "," + list.get(position);}}return listStr;} }

activity_main 布局文件代碼：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"android:background="#FFFFFF"><TextViewandroid:layout_width="match_parent"android:layout_height="40dp"android:background="@color/colorPrimary"android:gravity="center"android:text="HashSet實現多選" /><android.support.v7.widget.RecyclerViewandroid:id="@+id/rv_more"android:layout_width="match_parent"android:layout_height="wrap_content" /></LinearLayout>

2. MoreAdapter 主要代碼以及 adapter_more?布局文件代碼

MoreAdapter 主要代碼：

/*** author: wu* date: on 2018/11/12.* describe:多選適配器*/public class MoreAdapter extends RecyclerView.Adapter<MoreAdapter.MyViewHolder> {private final LayoutInflater mInflater;private Context context;private List<String> list;private HashSet<Integer> hashSet = new HashSet();public MoreAdapter(Context mContext, List<String> list) {this.context = mContext;this.list = list;mInflater = LayoutInflater.from(context);}//接口回調public interface OnItemClickListener {void onItemClick(int position, HashSet<Integer> hashSet);}public MoreAdapter.OnItemClickListener mOnItemClickListerer;public void setOnItemClickListerer(MoreAdapter.OnItemClickListener listerer) {this.mOnItemClickListerer = listerer;}@Overridepublic MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {View view = mInflater.inflate(R.layout.adapter_one, parent, false);MyViewHolder viewHolder = new MyViewHolder(view);return viewHolder;}@Overridepublic void onBindViewHolder(final MyViewHolder holder, final int position) {holder.tv_name.setText(list.get(position));//設置顯示名稱//item點擊事件holder.itemView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {addOrRemove(position,holder);//點擊回調mOnItemClickListerer.onItemClick(position, hashSet);}});}//操作Item記錄集合private void addOrRemove(int position, MyViewHolder holder) {if (hashSet.contains(position)) {// 如果包含，則撤銷選擇hashSet.remove(position);holder.tv_check.setVisibility(View.GONE);holder.tv_name.setTextColor(Color.parseColor("#FF666666"));} else {// 如果不包含，則添加hashSet.add(position);holder.tv_check.setVisibility(View.VISIBLE);holder.tv_name.setTextColor(Color.parseColor("#FF3300"));}}@Overridepublic int getItemCount() {return list != null ? list.size() : 0;}class MyViewHolder extends RecyclerView.ViewHolder {TextView tv_check, tv_name;public MyViewHolder(View itemView) {super(itemView);tv_name = itemView.findViewById(R.id.tv_name);tv_check = itemView.findViewById(R.id.tv_check);}} }

adapter_more?布局文件代碼 ：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="35dp"android:layout_margin="10dp"android:layout_weight="1"android:gravity="center"android:orientation="horizontal"android:background="#FFEEEEEE"><TextViewandroid:id="@+id/tv_check"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerInParent="true"android:text="√"android:textColor="#FF3300"android:textSize="12sp"android:visibility="gone"/><TextViewandroid:id="@+id/tv_name"android:layout_width="wrap_content"android:layout_height="match_parent"android:layout_marginLeft="2dp"android:gravity="center"android:text="不限"android:textColor="#FF666666"android:textSize="12sp" /> </LinearLayout>

這樣便可以用 HashSet 實現單選。

推薦：

• HashSet實現多選
• HashMap實現單選（HansMap的遍歷）

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