前言:近期项目重构,公司对项目结构进行了调整,增加了条件筛选的功能。在网上也看到了很多自定义的控件实现类似美团的附近筛选功能,实现方式基本都是自定义view继承自LinearLayout等布局控件,于是自己在Button的基础上添加了popupWindow并进行了简单封装,使用RecyclerView展示数据,实现了带二级菜单的筛选功能。
效果图:
实现方式:
(1)继承自AppCompatButton,实现PopupWindow.OnDismissListener
(2)PopupWindow展示二级菜单
(3)RecyclerView展示二级菜单的列表数据
(4)监听接口进行回调,用于筛选后更新UI
1.定义FilterPopupButton
(1)FilterPopupButton继承自AppCompatButton,重写构造方法
//三个有参构造方法
public FilterPopupButton(Context context) {
super(context);
this.context = context;
}
public FilterPopupButton(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.context = context;
}
public FilterPopupButton(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
inflater = LayoutInflater.from(context);
initAttrs(context, attrs);
initParams(context);
}
(2)设置控件属性参数
/**
* 初始化属性参数
* @param context 上下文对象
* @param attrs 属性
*/
private void initAttrs(Context context, AttributeSet attrs) {
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.popupbtn);
//正常状态下的背景色
mBackGround = typedArray.getResourceId(R.styleable.popupbtn_normalBg, -1);
//点击时的背景色
mClickBackGround = typedArray.getResourceId(R.styleable.popupbtn_pressBg, -1);
//正常状态下的图标
mIcon = typedArray.getResourceId(R.styleable.popupbtn_normalIcon, -1);
//点击状态下的图标
mClickIcon = typedArray.getResourceId(R.styleable.popupbtn_pressIcon, -1);
//回收
typedArray.recycle();
}
定义attrs,方便在布局文件使用时设置相关属性
<declare-styleable name="popupbtn">
<!-- 正常状态下的背景 -->
<attr name="normalBg" format="reference" />
<!-- 点击状态下的背景 -->
<attr name="pressBg" format="reference" />
<!-- 正常状态下的图标 -->
<attr name="normalIcon" format="reference" />
<!-- 点击状态下的图标 -->
<attr name="pressIcon" format="reference" />f
</declare-styleable>
(3)初始化其他参数
/**
* 初始化参数
*/
private void initParams(Context context) {
//初始化图标的padding值
paddingTop = this.getPaddingTop();
paddingLeft = this.getPaddingLeft();
paddingRight = this.getPaddingRight();
paddingBottom = this.getPaddingBottom();
//获取Window管理器
WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
//获取屏幕的宽和高
mScreenWidth = wm.getDefaultDisplay().getWidth();
mScreenHeight = wm.getDefaultDisplay().getHeight();
//设置正常状态下的参数
setNormalStatus();
}
(4)设置正常状态及点击状态下的背景及图标
/**
* 设置点击状态下的背景及图标
*/
private void setClickStatus() {
//设置点击时的背景色
if (mClickBackGround != -1) {
this.setBackgroundResource(mClickBackGround);
this.setPadding(paddingLeft, paddingTop, paddingRight, paddingBottom);
}
//设置点击时的图标
if (mClickIcon != -1) {
Drawable drawable = getResources().getDrawable(mClickIcon);
// 设置drawable的bounds以便展示图标
drawable.setBounds(0, 0, drawable.getMinimumWidth(), drawable.getMinimumHeight());
this.setCompoundDrawables(null, null, drawable, null);
}
}
/**
* 设置正常状态下的背景及图标
*/
private void setNormalStatus() {
//未点击状态背景
if (mBackGround != -1) {
this.setBackgroundResource(mBackGround);
this.setPadding(paddingLeft, paddingTop, paddingRight, paddingBottom);
}
//未点击状态下的图标
if (mIcon != -1) {
Drawable drawable = getResources().getDrawable(mIcon);
// 设置drawable的bounds以便展示图标
drawable.setBounds(0, 0, drawable.getMinimumWidth(), drawable.getMinimumHeight());
this.setCompoundDrawables(null, null, drawable, null);
}
}
2.PopupWindow
(1)初始化popupWindow布局文件
/**
* 初始化popupWindow的布局文件
*/
private void init() {
//初始化popupWindow的布局文件
View view = inflater.inflate(R.layout.popup_layout, null);
//展示一级菜单的view
mRvParent = (RecyclerView) view.findViewById(R.id.rv_parent);
//展示二级菜单的view
mRvChild = (RecyclerView) view.findViewById(R.id.rv_child);
//存储取值列表的集合
mValuesList = new ArrayList<>();
//默认添加一级菜单对应的二级菜单的第一个值列表
//mValuesList.addAll(mChildList.get(0));
mRvParent.setLayoutManager(new LinearLayoutManager(context, LinearLayoutManager.VERTICAL, false));
mRvParent.addItemDecoration(new DividerItemDecoration(context, DividerItemDecoration.VERTICAL));
mRvChild.setLayoutManager(new LinearLayoutManager(context, LinearLayoutManager.VERTICAL, false));
mRvChild.addItemDecoration(new DividerItemDecoration(context, DividerItemDecoration.VERTICAL));
//创建一级和二级菜单的adapter
mParentAdapter = new FilterAdapter(context, R.layout.popup_item, mParentList);
mChildAdapter = new FilterAdapter(context, R.layout.popup_item, mValuesList);
//设置一级菜单的第一个默认选中状态
mParentAdapter.recordSelectPosition(0);
mRvParent.setAdapter(mParentAdapter);
mRvChild.setAdapter(mChildAdapter);
//初始化popupWindow
initPopupView(view);
//父条目点击事件
mParentAdapter.setOnItemClickListener(new MultiItemTypeAdapter.OnItemClickListener() {
@Override
public void onItemClick(View view, RecyclerView.ViewHolder holder, int position) {
if (position == 0) {
//position=0为筛选全部,点击popupWindow消失并设置取值为父条目的第一个值
setText(mParentList.get(position));
hidePopupWindow(mParentList.get(position));
}
//记录父条目点击的position
mParentAdapter.recordSelectPosition(position);
mParentAdapter.notifyDataSetChanged();
mValuesList.clear();
//将子条目添加到取值列表
mValuesList.addAll(mChildList.get(position));
mChildAdapter.notifyDataSetChanged();
mChildAdapter.recordSelectPosition(-1);
//设置子条目默认选中第一个
//mRvChild.scrollToPosition(0);
}
@Override
public boolean onItemLongClick(View view, RecyclerView.ViewHolder holder, int position) {
return false;
}
});
//子条目点击事件
mChildAdapter.setOnItemClickListener(new MultiItemTypeAdapter.OnItemClickListener() {
@Override
public void onItemClick(View view, RecyclerView.ViewHolder holder, int position) {
//记录子条目点击的position
mChildAdapter.recordSelectPosition(position);
mChildAdapter.notifyDataSetChanged();
//设置选中的字符
setText(mValuesList.get(position));
//隐藏popupWindow
hidePopupWindow(mValuesList.get(position));
}
@Override
public boolean onItemLongClick(View view, RecyclerView.ViewHolder holder, int position) {
return false;
}
});
}
注:本文使用RecyclerView用于二级菜单数据列表的展示,并使用鸿洋大神封装的adapter,文末贴出依赖。
(2)popup_layout布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
android:orientation="horizontal">
<android.support.v7.widget.RecyclerView
android:id="@+id/rv_parent"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:scrollbars="none">
</android.support.v7.widget.RecyclerView>
<View
android:layout_width="1dp"
android:layout_height="match_parent"
android:background="@android:color/darker_gray" />
<android.support.v7.widget.RecyclerView
android:id="@+id/rv_child"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1">
</android.support.v7.widget.RecyclerView>
(3)initPopupWindow及hidePoupWindow
/**
* 初始化popupWindow
* @param view popupWindow的布局view
*/
public void initPopupView(final View view) {
this.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (mFixPopupWindow == null) {
LinearLayout layout = new LinearLayout(context);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, (int) (mScreenHeight * 0.6));
view.setLayoutParams(params);
layout.addView(view);
//设置背景色,不设置的话在有些机型会不显示popupWindow
layout.setBackgroundColor(Color.argb(60, 0, 0, 0));
//自定义的FixPopupWindow,解决在Build.VERSION.SDK_INT >= 24时,popupWindow显示位置在屏幕顶部问题
mFixPopupWindow = new FixPopupWindow(layout, mScreenWidth, mScreenHeight);
mFixPopupWindow.setFocusable(true);
mFixPopupWindow.setBackgroundDrawable(new BitmapDrawable());
//设置点击popupWindow外部可消失
mFixPopupWindow.setOutsideTouchable(true);
mFixPopupWindow.setOnDismissListener(FilterPopupButton.this);
layout.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mFixPopupWindow.dismiss();
}
});
}
//设置点击popupButton时的状态
setClickStatus();
mFixPopupWindow.showAsDropDown(FilterPopupButton.this);
}
});
}
/**
* 隐藏popupWindow
* @param value 获取到的值
*/
public void hidePopupWindow(String value) {
if (mFixPopupWindow != null && mFixPopupWindow.isShowing()) {
popupButtonMonitor.setFilterResult(value);
mFixPopupWindow.dismiss();
}
}
(4)定义recyclerView的adapter(FilterAdapter)
/**
* Created by ruancw on 2018/5/31.
*
*/
public class FilterAdapter extends CommonAdapter<String> {
private int selection;
public FilterAdapter(Context context, int layoutId, List<String> dataList) {
super(context,layoutId,dataList);
this.selection = -1;
}
@Override
protected void convert(ViewHolder holder, String value, int position) {
holder.setText(R.id.tv_des,value);
if(position == selection) {
holder.setBackgroundRes(R.id.tv_des,R.color.press);
}else {
holder.setBackgroundRes(R.id.tv_des,R.color.normal);
}
}
/**
* 记录选中的position位置
* @param position 上一次点击的位置
*/
public void recordSelectPosition(int position) {
this.selection = position;
}
}
注意:在adapter中有if必须要有else与之对应,不然会出现记录条目的背景色错乱问题。
3.Button+PopupWindow封装
(1)在FilterPopupWindow中定义设置数据的方法
/**
* 设置数据
* @param mParentList 一级菜单数据集合
* @param mChildList 二级菜单数据集合
*/
public void setValue(List<String> mParentList, List<List<String>> mChildList) {
this.mParentList = mParentList;
this.mChildList = mChildList;
//初始化popupWindow的布局文件
init();
}
init方法即是开始初始化popupWindow。
(2)定义数据监听接口,用于筛选完成重新更新UI
/**
* 监听数据的接口
*/
public interface PopupButtonMonitor {
//设置回调的方法
void setFilterResult(String filterResult);
}
/**
* 接口绑定
* @param popupButtonMonitor 接口
*/
public void setPopupButtonMonitor(PopupButtonMonitor popupButtonMonitor) {
this.popupButtonMonitor = popupButtonMonitor;
}
(3)实现PopupWindow.OnDismissListener的方法
@Override
public void onDismiss() {
//在popupWindow消失时,将状态设置为正常状态
setNormalStatus();
}
4.使用
(1)布局中
<com.rcw.filterpopup.FilterPopupButton
android:id="@+id/filter_popup_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="测试1"
android:textSize="20dp"
popupbtn:normalBg="@drawable/tab_bkg_line"
popupbtn:normalIcon="@drawable/arrow_down"
popupbtn:pressBg="@drawable/tab_bkg_selected"
popupbtn:pressIcon="@drawable/arrow_up_blue"
/>
使用popupbtn:xx属性需在根布局添加自定义属性声明:
xmlns:popupbtn="http://schemas.android.com/apk/res-auto"</pre>
(2)代码中
filterPopup=findViewById(R.id.filter_popup_button);
filterPopup.setValue(pList,cList);
filterPopup.setPopupButtonMonitor(this);
5.问题
细心的你可能发现,在文中我使用的是FixPopupWindow,没错,这是自定义的popupWindow。为什么要重新定义poupWindow而不使用系统的PopupWindow呢???
写完代码,迫不及待的进行了一番测试,一顿操作猛如虎,结果发现popupWindow的位置是在系统顶部而不是控件的下方,赶紧检查了下代码,发现使用的是showAsDropDown(View anchor)方法,经过一番努力,在stackoverflow中找到原因,原来是一系统级bug,在版本>=24时要在showASDropDown方法重新测量。
/**
* Created by ruancw on 2018/5/30.
* 重新定义popupWindow,解决版本过高,popupWindow的位置不在控件下方的问题
*/
public class FixPopupWindow extends PopupWindow {
public FixPopupWindow(View contentView, int width, int height) {
super(contentView, width, height);
}
@Override
public void showAsDropDown(View anchor, int xoff, int yoff) {
if(Build.VERSION.SDK_INT >= 24) {
Rect rect = new Rect();
anchor.getGlobalVisibleRect(rect);
int h = anchor.getResources().getDisplayMetrics().heightPixels - rect.bottom;
setHeight(h);
}
super.showAsDropDown(anchor, xoff, yoff);
}
}
鸿洋大神recyclerView的adapter依赖:
implementation 'com.zhy:base-rvadapter:3.0.3'
至此,自定义带popupWindow的二级菜单筛选控件简单的封装就实现了,不足之处,欢迎评论与留言!!!