Android之在RecyclerView列表中实现单选

一、实现效果

单选、可取消选中、列表数据可更新（选择状态清空，可重新选择）

RecyclerView列表单选

二、实现步骤

仅展示部分核心代码，请主要参考适配器的定义

1、Item布局

selected_tip_list_item.xml文件
包含一个TextView和一个右侧选中的图片ImageView√

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"xmlns:app="http://schemas.android.com/apk/res-auto"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="42dp"android:orientation="horizontal"android:gravity="center_vertical"android:paddingStart="8dp"android:paddingEnd="8dp"android:paddingTop="6dp"android:paddingBottom="6dp"><TextViewandroid:id="@+id/tv_tip_name"android:layout_width="wrap_content"android:layout_height="match_parent"android:text="账号1"android:textColor="@color/color_333333"android:textSize="@dimen/sp_17"android:gravity="center_vertical"/><Viewandroid:layout_width="0dp"android:layout_height="match_parent"android:layout_weight="1"/><ImageViewandroid:id="@+id/img_selected_icon"android:layout_width="wrap_content"android:layout_height="wrap_content"android:visibility="gone"android:src="@mipmap/selected_tip_icon"/></LinearLayout></LinearLayout>

2、Activity布局

SmartRefreshLayout搭配RecyclerView的使用可参考另一篇文章：Android中SmartRefreshLayout+RecyclerView实现下拉刷新和上拉加载（分页）显示网络请求数据

<com.scwang.smartrefresh.layout.SmartRefreshLayoutandroid:id="@+id/refresh_view_tip_list"android:layout_width="match_parent"android:layout_height="match_parent"><androidx.recyclerview.widget.RecyclerViewandroid:id="@+id/recycler_view_select_tip"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_marginTop="5dp"android:layout_marginBottom="10dp"/>
</com.scwang.smartrefresh.layout.SmartRefreshLayout>

3、RecyclerView的适配器

activity内部自定义适配器TipListAdapter

class TipListAdapter extends RecyclerView.Adapter<MyTipViewHolder>{private boolean isClick = false;private int mPosition = -1; //当前已选中位置public int getmPosition() {return mPosition;}public boolean isClick() {return isClick;}public void setmPosition(int mPosition,boolean isClick) {this.mPosition = mPosition;this.isClick = isClick;}@NonNull@Overridepublic MyTipViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {View v = View.inflate(AddTipActivity.this,R.layout.select_tip_list_item, null);MyTipViewHolder holder = new MyTipViewHolder(v);holder.itemView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {//将点击选中的Item信息赋值给上方的输入框mEditTipName.setText(holder.mTvTipName.getText().toString());if (!isClick){setmPosition(holder.getBindingAdapterPosition(),true);}else{setmPosition(holder.getBindingAdapterPosition(),getmPosition() != holder.getBindingAdapterPosition());}notifyDataSetChanged();}});return holder;}@Overridepublic void onBindViewHolder(@NonNull MyTipViewHolder holder, int position) {String info = mTipBeanList.get(position);holder.mTvTipName.setText(info);if (getmPosition() == position && isClick) {//选中某行holder.itemView.setBackground(getDrawable(R.drawable.finished_product_selected_button_background2));holder.mTvTipName.setTextColor(ContextCompat.getColor(AddTipActivity.this,R.color.color_D32124));holder.mImgSelectedIcon.setVisibility(View.VISIBLE);}else if (getmPosition() == position && !isClick){//取消已选中行mEditTipName.setText("");holder.itemView.setBackground(getDrawable(R.drawable.unselected_tip_background));holder.mImgSelectedIcon.setVisibility(View.GONE);holder.mTvTipName.setTextColor(ContextCompat.getColor(AddTipActivity.this,R.color.color_333333));}else {holder.itemView.setBackground(getDrawable(R.drawable.unselected_tip_background));holder.mImgSelectedIcon.setVisibility(View.GONE);holder.mTvTipName.setTextColor(ContextCompat.getColor(AddTipActivity.this,R.color.color_333333));}}@Overridepublic int getItemCount() {return mTipBeanList.size();}//列表更新时调用的方法public void refreshData(List<String> data) {mTipBeanList.clear();mTipBeanList.addAll(data);//列表数据刷新时所有Item均恢复未选中状态setmPosition(-1,false);notifyDataSetChanged();}}class MyTipViewHolder extends RecyclerView.ViewHolder{TextView mTvTipName;ImageView mImgSelectedIcon;  MyTipViewHolder(View itemView) {super(itemView);mTvTipName = itemView.findViewById(R.id.tv_tip_name);mImgSelectedIcon = itemView.findViewById(R.id.img_selected_icon);}}

3、Activity内调用示例

（1）绑定控件

@InjectView(id = R.id.refresh_view_tip_list)
private SmartRefreshLayout mRefreshLayout;@InjectView(id = R.id.recycler_view_select_tip)
private RecyclerView mRecyclerViewAllTips;

（2）初始化列表和适配器

adapter = new TipListAdapter();
mRecyclerViewAllTips.setAdapter(adapter);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
mRecyclerViewAllTips.setLayoutManager(linearLayoutManager);
mRecyclerViewAllTips.setItemAnimator(new DefaultItemAnimator());
//设置下拉刷新和上拉加载样式
mRefreshLayout.setRefreshHeader(new ClassicsHeader(this));
mRefreshLayout.setOnMultiPurposeListener(new SimpleMultiPurposeListener(){//下拉刷新@Overridepublic void onRefresh(@NonNull RefreshLayout refreshLayout) {super.onRefresh(refreshLayout);//？？？？这里去调用请求数据的方法，并更新adaptermRecyclerViewAllTips.smoothScrollToPosition(0);mRefreshLayout.finishRefresh(1000);}});
//首次进入页面自动刷新
mRefreshLayout.autoRefresh();