就是一个数据展示的功能，左边是目录、右边是详情列表。效果图如下：
实现的思路，就是左右一个列表，右边的列表里面嵌套一个列表，一共三个列表。
第一步：先写一个主页面布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Activity.PageEffect.recycleview.doubleList.DoubleListActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv_left"
android:layout_width="100dp"
android:layout_height="wrap_content"/>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv_right"
android:layout_toRightOf="@+id/rv_left"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>第二步：写一个左边适配器
public class LeftAdapter extends RecyclerView.Adapter<LeftAdapter.LeftHolder>{
Context context;
List<LeftBean> list;
OnItemClickListener onItemClickListener;
public LeftAdapter(Context context, List<LeftBean> list){
this.context=context;
this.list=list;
}
@NonNull
@Override
public LeftHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view= LayoutInflater.from(context).inflate(R.layout.item_recycleview_left,parent,false);
return new LeftHolder(view);
}
@Override
public void onBindViewHolder(@NonNull LeftHolder holder, @SuppressLint("RecyclerView") int position) {
holder.typeTv.setText(list.get(position).getType());
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (onItemClickListener!=null){
onItemClickListener.onItemClick(v,position);
}
}
});
if (list.get(position).isSelected()){
holder.leftRl.setBackgroundColor(Color.parseColor("#0000ff"));
holder.typeTv.setTextColor(Color.parseColor("#00ff00"));
}else {
holder.leftRl.setBackgroundColor(Color.parseColor("#00ff00"));
holder.typeTv.setTextColor(Color.parseColor("#666666"));
}
}
@Override
public int getItemCount() {
return list.size();
}
public static class LeftHolder extends RecyclerView.ViewHolder {
RelativeLayout leftRl;
TextView typeTv;
public LeftHolder(@NonNull View itemView) {
super(itemView);
leftRl=itemView.findViewById(R.id.rl_left);
typeTv=itemView.findViewById(R.id.tv_type);
}
}
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
public interface OnItemClickListener{
void onItemClick(View v,int position);
}
public void setList(List<LeftBean> list) {
this.list = list;
}
}
第三步，写左边列表的布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rl_left"
android:layout_width="100dp"
android:layout_height="60dp">
<TextView
android:id="@+id/tv_type"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="30sp"
android:gravity="center"/>
</RelativeLayout>第四步，写右边列表适配器
public class RightAdapter extends RecyclerView.Adapter<RightAdapter.RightHolder>{
private Context context;
private List<RightBean> list;
public RightAdapter(Context context, List<RightBean> list) {
this.context = context;
this.list = list;
}
@NonNull
@Override
public RightHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view= LayoutInflater.from(context).inflate(R.layout.item_recycleview_right,parent,false);
return new RightHolder(view);
}
@Override
public void onBindViewHolder(@NonNull RightHolder holder, int position) {
holder.typeTv.setText(list.get(position).getType());
holder.recyclerView.setLayoutManager(new GridLayoutManager(context,2));
holder.recyclerView.setAdapter(new RightDetailAdapter(context,list.get(position).getDetailList()));
}
@Override
public int getItemCount() {
return list.size();
}
public static class RightHolder extends RecyclerView.ViewHolder {
TextView typeTv;
RecyclerView recyclerView;
public RightHolder(@NonNull View itemView) {
super(itemView);
typeTv=itemView.findViewById(R.id.tv_right_type);
recyclerView=itemView.findViewById(R.id.rv_right_detail);
}
}
public void setList(List<RightBean> list) {
this.list = list;
}
}第五步：写右边列表的布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/tv_right_type"
android:layout_width="match_parent"
android:layout_height="50dp"
android:textSize="30sp"
android:textColor="@color/blue"
android:gravity="center_vertical"
android:textStyle="bold"/>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv_right_detail"
android:layout_below="@+id/tv_right_type"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</RelativeLayout>第六步，写右边列表里面嵌套的详情列表适配器
public class RightDetailAdapter extends RecyclerView.Adapter<RightDetailAdapter.RightDetailHolder>{
private Context context;
private List<RightBean.Detail> list;
public RightDetailAdapter(Context context,List<RightBean.Detail> list){
this.context=context;
this.list=list;
}
@NonNull
@Override
public RightDetailHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view= LayoutInflater.from(context).inflate(R.layout.item_recycleview_right_detail,parent,false);
return new RightDetailHolder(view);
}
@Override
public void onBindViewHolder(@NonNull RightDetailHolder holder, int position) {
holder.nameTv.setText(list.get(position).getName());
}
@Override
public int getItemCount() {
return list.size();
}
public static class RightDetailHolder extends RecyclerView.ViewHolder {
TextView nameTv;
public RightDetailHolder(@NonNull View itemView) {
super(itemView);
nameTv=itemView.findViewById(R.id.tv_name);
}
}
public void setList(List<RightBean.Detail> list) {
this.list = list;
}
}
第七步，写详情列表的布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="30dp">
<ImageView
android:id="@+id/iv_icon"
android:layout_width="100dp"
android:layout_height="100dp"
android:src="@mipmap/ic_launcher"/>
<TextView
android:id="@+id/tv_name"
android:layout_below="@id/iv_icon"
android:layout_width="100dp"
android:layout_height="50dp"
android:gravity="center"
android:textSize="24sp"
android:textColor="@color/green"/>
</RelativeLayout>第八步，在主Activity里面写具体的联动方法
public class DoubleListActivity extends AppCompatActivity {
private RecyclerView leftRv;
private LeftAdapter leftAdapter;
private List<LeftBean> leftBeanList=new ArrayList<>();
private RecyclerView rightRv;
private RightAdapter rightAdapter;
private List<RightBean> rightBeanList=new ArrayList<>();
private int currentPosition = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_double_list);
initView();
}
private void initView(){
leftRv=findViewById(R.id.rv_left);
leftBeanList.add(new LeftBean("名酒",false));
leftBeanList.add(new LeftBean("名烟",false));
leftBeanList.add(new LeftBean("饮料",false));
leftBeanList.add(new LeftBean("手机",false));
leftAdapter=new LeftAdapter(this,leftBeanList);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
leftRv.setLayoutManager(linearLayoutManager);
leftRv.setAdapter(leftAdapter);
rightRv=findViewById(R.id.rv_right);
RightBean rightBean=new RightBean();
rightBean.setType("名酒");
List<RightBean.Detail> detailList=new ArrayList<>();
detailList.add(new RightBean.Detail("茅台"));
detailList.add(new RightBean.Detail("五粮液"));
detailList.add(new RightBean.Detail("剑南春"));
detailList.add(new RightBean.Detail("汾酒"));
detailList.add(new RightBean.Detail("花雕"));
detailList.add(new RightBean.Detail("红酒"));
rightBean.setDetailList(detailList);
rightBeanList.add(rightBean);
RightBean rightBean2=new RightBean();
rightBean2.setType("名烟");
List<RightBean.Detail> detailList2=new ArrayList<>();
detailList2.add(new RightBean.Detail("中华"));
detailList2.add(new RightBean.Detail("玉溪"));
detailList2.add(new RightBean.Detail("双喜"));
detailList2.add(new RightBean.Detail("小苏"));
detailList2.add(new RightBean.Detail("黄鹤楼"));
rightBean2.setDetailList(detailList2);
rightBeanList.add(rightBean2);
RightBean rightBean3=new RightBean();
rightBean3.setType("饮料");
List<RightBean.Detail> detailList3=new ArrayList<>();
detailList3.add(new RightBean.Detail("可乐"));
detailList3.add(new RightBean.Detail("雪碧"));
detailList3.add(new RightBean.Detail("冰红茶"));
detailList3.add(new RightBean.Detail("绿茶"));
detailList3.add(new RightBean.Detail("脉动"));
detailList3.add(new RightBean.Detail("冰糖雪梨"));
rightBean3.setDetailList(detailList3);
rightBeanList.add(rightBean3);
RightBean rightBean4=new RightBean();
rightBean4.setType("手机");
List<RightBean.Detail> detailList4=new ArrayList<>();
detailList4.add(new RightBean.Detail("华为"));
detailList4.add(new RightBean.Detail("魅族"));
detailList4.add(new RightBean.Detail("小米"));
detailList4.add(new RightBean.Detail("红米"));
detailList4.add(new RightBean.Detail("三星"));
detailList4.add(new RightBean.Detail("长虹"));
rightBean4.setDetailList(detailList4);
rightBeanList.add(rightBean4);
rightAdapter=new RightAdapter(this,rightBeanList);
LinearLayoutManager linearLayoutManager_right = new LinearLayoutManager(this);
rightRv.setLayoutManager(linearLayoutManager_right);
rightRv.setAdapter(rightAdapter);
leftAdapter.setOnItemClickListener(new LeftAdapter.OnItemClickListener() {
@Override
public void onItemClick(View v, int position) {
for(int i=0;i<leftBeanList.size();i++){
if (i==position){
leftBeanList.get(i).setSelected(true);
}else {
leftBeanList.get(i).setSelected(false);
}
}
leftAdapter.setList(leftBeanList);
leftAdapter.notifyDataSetChanged();
LinearLayoutManager linearLayoutManager_right= (LinearLayoutManager)rightRv.getLayoutManager();
if (linearLayoutManager_right!=null){
linearLayoutManager_right.scrollToPositionWithOffset(position,0);
}
}
});
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
rightRv.setOnScrollChangeListener(new View.OnScrollChangeListener() {
@Override
public void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
LinearLayoutManager linearLayoutManager_right= (LinearLayoutManager) rightRv.getLayoutManager();
LinearLayoutManager linearLayoutManager_left= (LinearLayoutManager) leftRv.getLayoutManager();
if (linearLayoutManager_right!=null&&linearLayoutManager_left!=null){
currentPosition=linearLayoutManager_right.findFirstVisibleItemPosition();
if (linearLayoutManager_left.findFirstVisibleItemPosition()>currentPosition){
linearLayoutManager_left.scrollToPositionWithOffset(currentPosition,0);
}else if (linearLayoutManager_left.findFirstVisibleItemPosition()<currentPosition){
linearLayoutManager_left.scrollToPositionWithOffset(currentPosition,0);
}
if (!rightRv.canScrollVertically(1)){
currentPosition=leftBeanList.size()-1;
}
for(int i=0;i<leftBeanList.size();i++){
if (i==currentPosition){
leftBeanList.get(i).setSelected(true);
}else {
leftBeanList.get(i).setSelected(false);
}
}
leftAdapter.setList(leftBeanList);
leftAdapter.notifyDataSetChanged();
}
}
});
}
}
}另外两个ben类代码如下
public class LeftBean {
private String type;
private boolean selected;
public LeftBean(String type, boolean selected) {
this.type = type;
this.selected = selected;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public boolean isSelected() {
return selected;
}
public void setSelected(boolean selected) {
this.selected = selected;
}
@Override
public String toString() {
return "LeftBean{" +
"type='" + type + '\'' +
", selected=" + selected +
'}';
}
}
public class RightBean {
public String type;
public List<Detail> detailList;
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public List<Detail> getDetailList() {
return detailList;
}
public void setDetailList(List<Detail> detailList) {
this.detailList = detailList;
}
@Override
public String toString() {
return "RightBean{" +
"type='" + type + '\'' +
", detailList=" + detailList +
'}';
}
public static class Detail{
String name;
public Detail(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Detail{" +
"name='" + name + '\'' +
'}';
}
}
}