PopupWindow+RecyclerView实现下拉选择Spinner_码农小北的技术博客_

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PopupWindow+RecyclerView实现下拉选择Spinner_List

当我们在Android开发中需要实现下拉选择功能时，可以使用自定义的Spinner控件来实现。Spinner控件是一个下拉列表框，可以显示多个选项供用户选择，并在用户选择后显示所选项的文本。

为了方便使用和扩展，我们可以对Spinner进行封装，创建一个自定义的Spinner控件。自定义Spinner可以具备以下特性：

点击展开和收起 ：通过点击Spinner，可以展开或收起下拉列表框。
自定义样式 ：可以根据项目需求，自定义Spinner的外观样式，如背景颜色、字体颜色、箭头图标等。
支持数据源 ：可以传入数据源，将数据显示在下拉列表框中供用户选择。
默认选择项 ：可以指定一个默认选择项，在下拉列表框展开时，该选项将被高亮显示。
选择监听 ：可以设置选择监听器，监听用户的选择操作，并进行相应的处理。

通过封装Spinner，我们可以将其功能与外观进行统一管理，并提供更加简洁和易用的接口供其他开发者使用。这样，其他开发者在使用时只需关注数据源和监听回调即可，无需关心Spinner的内部实现细节。

自定义Spinner的封装可以提高代码的可维护性和可复用性，减少重复代码的编写，同时也使代码结构更加清晰和易于理解。

总之，封装Spinner可以帮助我们更高效地实现下拉选择功能，并提供灵活性和可扩展性，使代码更加优雅和易于维护。

使用第三方控件：implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.47'

图片示例：

自定义控件封装定义类CustomSpinner继承LinearLayout以下是示例：

点击展开查看CustomSpinner代码

package com.example.demo.view;
import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.core.content.ContextCompat;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.chad.library.adapter.base.BaseViewHolder;
import com.example.demo.R;
import java.util.Collection;
import java.util.List;
@author: xtxiaolu
@date: 2023/7/7
public class CustomSpinner extends LinearLayout {
private TextView textView;
private ImageView imageView;
private PopupWindow popupWindow;
private List dataList;
private boolean isExpanded = false;
private OnItemSelectedListener itemSelectedListener;
public CustomSpinner(Context context) {
super(context);
init();
public CustomSpinner(Context context, AttributeSet attrs) {
super(context, attrs);
init();
public CustomSpinner(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
private void init() {
LayoutInflater.from(getContext()).inflate(R.layout.custom_spinner_layout, this, true);
textView = findViewById(R.id.ll_list_default_txt);
imageView = findViewById(R.id.ll_list_default_icon);
 setClickable(true);
 setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
         if (isExpanded) {
             collapse();
         } else {
             expand();
public void setData(List dataList) {
this.dataList = dataList;
public void replaceData(@NonNull Collection<? extends T> data) {
// 不是同一个引用才清空列表
if (data != dataList) {
dataList.clear();
dataList.addAll(data);
public void setTextViewValue(String value) {
textView.setText(value);
public TextView getTextViewValue() {
return textView;
private void expand() {
if (dataList == null || dataList.isEmpty()) {
return;
 textView.setTextColor(ContextCompat.getColor(getContext(), R.color.text_order_black));
 imageView.setImageResource(R.drawable.expand_arrows_fold);
 View popupView = LayoutInflater.from(getContext()).inflate(R.layout.popup_selector, null);
 RecyclerView recyclerView = popupView.findViewById(R.id.recyclerView);
 recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
 CustomAdapter popAdapter = new CustomAdapter<>(R.layout.item_listview_popwin, dataList);
 popAdapter.setSelectedPosition(0);
 popAdapter.setOnItemClickListener(new CustomAdapter.OnItemClickListener() {
     @Override
     public void onItemClick(int position) {
         T selectedItem = dataList.get(position);
         if (itemSelectedListener != null) {
             itemSelectedListener.onItemSelected(position, selectedItem);
         popupWindow.dismiss();
     @Override
     public void convertView(BaseViewHolder holder, Object item, boolean isSelected) {
         if (itemSelectedListener != null) {
             itemSelectedListener.onItemCallBackData(holder, item);
 recyclerView.setAdapter(popAdapter);
 int width = ViewGroup.LayoutParams.MATCH_PARENT;
 int height = ViewGroup.LayoutParams.WRAP_CONTENT;
 popupWindow = new PopupWindow(popupView, width, height);
 popupWindow.setBackgroundDrawable(new ColorDrawable(Color.WHITE));
 popupWindow.setFocusable(true);
 popupWindow.setOutsideTouchable(true);
 popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
     @Override
     public void onDismiss() {
         collapse();
 int[] location = new int[2];
 getLocationOnScreen(location);
 int x = location[0];
 int y = location[1] + getHeight();
 popupWindow.showAtLocation(this, Gravity.NO_GRAVITY, x, y);
 isExpanded = true;
private void collapse() {
textView.setTextColor(ContextCompat.getColor(getContext(), R.color.colorTextBlue));
imageView.setImageResource(R.drawable.expand_arrows_unfold);
 if (popupWindow != null && popupWindow.isShowing()) {
     popupWindow.dismiss();
 isExpanded = false;
public void setOnItemSelectedListener(OnItemSelectedListener listener) {
this.itemSelectedListener = listener;
public interface OnItemSelectedListener {
void onItemSelected(int position, Object item);
void onItemCallBackData(BaseViewHolder holder, Object item);
 setClickable(true);
 setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
         if (isExpanded) {
             collapse();
         } else {
             expand();
 textView.setTextColor(ContextCompat.getColor(getContext(), R.color.text_order_black));
 imageView.setImageResource(R.drawable.expand_arrows_fold);
 View popupView = LayoutInflater.from(getContext()).inflate(R.layout.popup_selector, null);
 RecyclerView recyclerView = popupView.findViewById(R.id.recyclerView);
 recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
 CustomAdapter popAdapter = new CustomAdapter<>(R.layout.item_listview_popwin, dataList);
 popAdapter.setSelectedPosition(0);
 popAdapter.setOnItemClickListener(new CustomAdapter.OnItemClickListener() {
     @Override
     public void onItemClick(int position) {
         T selectedItem = dataList.get(position);
         if (itemSelectedListener != null) {
             itemSelectedListener.onItemSelected(position, selectedItem);
         popupWindow.dismiss();
     @Override
     public void convertView(BaseViewHolder holder, Object item, boolean isSelected) {
         if (itemSelectedListener != null) {
             itemSelectedListener.onItemCallBackData(holder, item);
 recyclerView.setAdapter(popAdapter);
 int width = ViewGroup.LayoutParams.MATCH_PARENT;
 int height = ViewGroup.LayoutParams.WRAP_CONTENT;
 popupWindow = new PopupWindow(popupView, width, height);
 popupWindow.setBackgroundDrawable(new ColorDrawable(Color.WHITE));
 popupWindow.setFocusable(true);
 popupWindow.setOutsideTouchable(true);
 popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
     @Override
     public void onDismiss() {
         collapse();
 int[] location = new int[2];
 getLocationOnScreen(location);
 int x = location[0];
 int y = location[1] + getHeight();
 popupWindow.showAtLocation(this, Gravity.NO_GRAVITY, x, y);
 isExpanded = true;
 if (popupWindow != null && popupWindow.isShowing()) {
     popupWindow.dismiss();
 isExpanded = false;

language

上面是控件代码下面是适配器代码都是使用范型来传输数据这样方便通用！

展开查看CustomAdapter

package com.example.demo.view;
import android.view.View;
import androidx.annotation.LayoutRes;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import com.chad.library.adapter.base.BaseQuickAdapter;
import com.chad.library.adapter.base.BaseViewHolder;
import java.util.List;
@author: xtxiaolu
@date: 2023/7/7
public class CustomAdapter extends BaseQuickAdapter<T, BaseViewHolder> {
private int selectedPosition = -1;
private OnItemClickListener itemClickListener;
public CustomAdapter(@LayoutRes int layoutResId, @Nullable List data) {
super(layoutResId, data);
public void setSelectedPosition(int position) {
this.selectedPosition = position;
notifyDataSetChanged();
public void setOnItemClickListener(OnItemClickListener listener) {
this.itemClickListener = listener;
@Override
protected void convert(BaseViewHolder holder, T item) {
if (itemClickListener != null) {
itemClickListener.convertView(holder, item, selectedPosition == holder.getBindingAdapterPosition());
@Override
public void onBindViewHolder(@NonNull BaseViewHolder holder, int position) {
super.onBindViewHolder(holder, position);
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (itemClickListener != null) {
itemClickListener.onItemClick(holder.getBindingAdapterPosition());
public interface OnItemClickListener {
void onItemClick(int position);
 void convertView(BaseViewHolder holder, Object item, boolean isSelected);
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