前言
之前讲过一篇关于PopuWindow的基本使用的文章,想了解的同学可以参考:PopupWindow的基本使用
其实,下拉列表Spanner(不知道控件拼写是否正确)就能实现,但是基于ui美化方面的考虑,用popuwindow实现是一个不错的选择,今天就来讲讲PopuWindow实现下拉列表的具体实现吧。
正文
文章可能会有点长,大家将就着看吧。先上波效果图才是厚道的:
下面开始正式讲解。
基础依赖,由于下拉列表是用RecycleVIEw实现,然后控件初始化用到ButterKnife,所以要在app的gradle中添加相关依赖:
//RecycleVIEw compile 'com.androID.support:recyclervIEw-v7:25.2.0' //butterKnife compile 'com.jakewharton:butterknife:8.5.1' //这条千万不能忘记!! annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'
第一步,不言而喻,肯定是上BasePopupWindow代码:
/*** * PopupWindow基类 * * @author pei * @version 1.0 * @cretae 2016-7-21 * @注:若要popwindow点击外部消失,则设置 this.setFocusable(true) * 若要popwindow点击外部不消失,不做setFocusable设置,也不要设置成this.setFocusable(false) * */public abstract class BasePopupWindow extends PopupWindow { protected VIEw mLayoutVIEw; protected int mLayoutID; protected Context mContext; protected int mWIDth; protected int mHeight; public BasePopupWindow(int wIDth,int height,int layoutID,Context context) { this.mWIDth = wIDth; this.mHeight = height; this.mLayoutID = layoutID; this.mContext = context; mLayoutVIEw = LayoutInflater.from(context).inflate(mLayoutID,null); setwindow(); } /** PopupWindow基本设置 **/ protected voID setwindow() { this.setContentVIEw(mLayoutVIEw); this.setWIDth(mWIDth); this.setHeight(mHeight); // this.setFocusable(true);// 可点击 // 实例化一个colorDrawable颜色为半透明(半透明遮罩颜色代码#66000000) colorDrawable DW = new colorDrawable(color.transparent); this.setBackgroundDrawable(DW); } /** PopupWindow背景设置 **/ protected voID setBackground(int color) { // 实例化一个colorDrawable颜色为半透明 colorDrawable DW = new colorDrawable(color); this.setBackgroundDrawable(DW); } protected abstract voID initVIEw(); protected abstract voID initData(); protected abstract voID setListener(); /** PopupWindow点击间隙处理,根据实际情况重写 **/ protected voID ontouchdimiss() { // mMenuVIEw添加OntouchListener监听判断获取触屏位置如果在选择框外面则销毁d出框 mLayoutVIEw.setontouchListener(new OntouchListener() { @OverrIDe public boolean ontouch(VIEw vIEw,MotionEvent event) {// int height = mLayoutVIEw.gettop();// int y = (int) event.getY();// if (event.getAction() == MotionEvent.ACTION_UP) {// if (y < height) {// dismiss();// }// } return false; } }); } /** * 显示在控件正上方 * * @param vIEw * 依赖的控件 * @param marginDp * 设置的间距(直接写数字即可,已经做过dp2px转换) */ public voID showAtLocationtop(VIEw vIEw,float marginDp) { mLayoutVIEw.measure(MeasureSpec.UnspecIFIED,MeasureSpec.UnspecIFIED); int popupWIDth = mLayoutVIEw.getMeasureDWIDth(); int popupHeight = mLayoutVIEw.getMeasuredHeight(); int[] location = new int[2]; vIEw.getLocationOnScreen(location); showAtLocation(vIEw,Gravity.NO_GraviTY,(location[0] + vIEw.getWIDth() / 2) - popupWIDth / 2,location[1] - popupHeight - dp2px(marginDp)); update(); } /** * 显示在控件正下方 * * @param vIEw * 依赖的控件 * @param marginDp * 设置的间距(直接写数字即可,已经做过dp2px转换) */ public voID showAtLocationGravityBottom(VIEw vIEw,(location[0]+vIEw.getWIDth()/2)-popupWIDth/2,location[1]+vIEw.getHeight()+dp2px(marginDp)); update(); } /**显示在控件下方 * * @param vIEw 依赖的控件 * @param marginDp 设置的间距(直接写数字即可,已经做过dp2px转换) */ public voID showAtLocationBottom(VIEw vIEw,float marginDp){ showAsDropDown(vIEw,dp2px(marginDp)); update(); } /** * 显示在控件左方 * * @param vIEw * 依赖的控件 * @param marginDp * 设置的间距(直接写数字即可,已经做过dp2px转换) */ public voID showAtLocationleft(VIEw vIEw,location[0] - popupWIDth - dp2px(marginDp),(location[1] + vIEw.getHeight() / 2) - popupHeight / 2); update(); } /** * 显示在控件右方 * * @param vIEw * 依赖的控件 * @param marginDp * 设置的间距(直接写数字即可,已经做过dp2px转换) */ public voID showAtLocationRight(VIEw vIEw,location[0] + vIEw.getWIDth() + dp2px(marginDp),(location[1] + vIEw.getHeight() / 2) - popupHeight / 2); update(); } /** dp转px **/ private int dp2px(float dpVal) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,dpVal,mContext.getResources().getdisplayMetrics()); } /** 通过ID获得vIEw **/ @SuppressWarnings("unchecked") protected <T extends VIEw> T getVIEw(int vIEwID) { VIEw vIEw = null; if (mLayoutVIEw == null) { mLayoutVIEw = LayoutInflater.from(mContext).inflate(mLayoutID,null); } vIEw = mLayoutVIEw.findVIEwByID(vIEwID); return (T) vIEw; }}
第二步,写一个OrderPop继承于BasePopupWindow:
/** * Instruction:下拉列表Pop * <p> * Author:pei * Date: 2017/6/28 * Description: */public class OrderPop extends BasePopupWindow{ private RecyclerVIEw mRecyclerVIEw; private List<String>mDatas; private ManagerPopuAdapter<String> managerPopuAdapter; public OrderPop(Context context,List<String>datas) { super(ScreenUtil.dp2px(100,context),ScreenUtil.dp2px(150,R.layout.pop_order,context); this.mDatas=datas; initVIEw(); initData(); setListener(); } @OverrIDe protected voID initVIEw() { mRecyclerVIEw=getVIEw(R.ID.recycler_vIEw); } @OverrIDe protected voID initData() { setFocusable(true); setAnimationStyle(R.style.popuwindow_up_style);//popuwindow显示隐藏的动画 mRecyclerVIEw.setHasFixedSize(true); mRecyclerVIEw.setLayoutManager(new linearlayoutmanager(mContext)); managerPopuAdapter = new ManagerPopuAdapter<String>(mContext,mDatas); mRecyclerVIEw.setAdapter(managerPopuAdapter); } @OverrIDe protected voID setListener(){ } public ManagerPopuAdapter getAdapter(){ return managerPopuAdapter; } public voID notifyDataSetChanged(){ if(managerPopuAdapter!=null){ managerPopuAdapter.notifyDataSetChanged(); } } public voID setCurrentIndex(int position){ if(managerPopuAdapter!=null){ managerPopuAdapter.setIndex(position); } }}
OrderPop类中涉及到的内容挺多,以下将细细讲解。
1.--- 声明中涉及到RecycleVIEw的一个适配器ManagerPopuAdapter,其代码如下:
/** * Instruction: Orderpop的适配器 * <p> * Author:pei * Date: 2017/6/29 * Description: */public class ManagerPopuAdapter<T> extends RecyclerVIEw.Adapter { protected Context mContext; protected VIEw mLayoutVIEw; protected List<T> mData; private VIEwHolder mVIEwHolder; protected OnRecyclerItemClickListener mOnRecyclerItemClickListener; private int mIndex; public voID setonRecyclerItemClickListener(OnRecyclerItemClickListener onRecyclerItemClickListener) { this.mOnRecyclerItemClickListener = onRecyclerItemClickListener; } public ManagerPopuAdapter(Context context,List<T> data) { this.mContext = context; this.mData = data; } @OverrIDe public RecyclerVIEw.VIEwHolder onCreateVIEwHolder(VIEwGroup parent,int vIEwType) { //注:不可使用vIEw=LayoutInflater.from(mContext).inflate(R.layout.item_layout,null);不然会报错 mLayoutVIEw = LayoutInflater.from(mContext).inflate(R.layout.item_popu_order_layout,parent,false); return new VIEwHolder(mLayoutVIEw); } @OverrIDe public int getItemVIEwType(int position) { return super.getItemVIEwType(position); } @OverrIDe public int getItemCount() { return mData == null ? 0 : mData.size(); } @OverrIDe public voID onBindVIEwHolder(RecyclerVIEw.VIEwHolder holder,int position) { mVIEwHolder = ((VIEwHolder) holder); initData(position); setListener(position); } private voID initData(int position) { String content =mData.get(position).toString(); mVIEwHolder.tvContent.setText(content); if(mIndex==position){ mVIEwHolder.tvContent.setSelected(true); }else{ mVIEwHolder.tvContent.setSelected(false); } } private voID setListener(final int position) { mVIEwHolder.tvContent.setonClickListener(new VIEw.OnClickListener() { @OverrIDe public voID onClick(VIEw v) { if (mOnRecyclerItemClickListener != null) { mOnRecyclerItemClickListener.onRecyclerClick(position); } } }); } public voID setIndex(int index){ this.mIndex=index; } class VIEwHolder extends RecyclerVIEw.VIEwHolder { TextVIEw tvContent; public VIEwHolder(VIEw vIEw) { super(vIEw); tvContent=(TextVIEw)vIEw.findVIEwByID(R.ID.tv_content); } } public interface OnRecyclerItemClickListener { voID onRecyclerClick(int position); }}
2.--- ManagerPopuAdapter.java对应的layout----- item_popu_order_layout.xml代码:
<?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="wrap_content" androID:layout_margintop="3dp" androID:layout_marginBottom="3dp"> <TextVIEw androID:ID="@+ID/tv_content" androID:layout_wIDth="match_parent" androID:layout_height="wrap_content" androID:linespacingExtra="1dp" androID:linespacingMultiplIEr="1.0" androID:layout_marginleft="2dp" androID:layout_marginRight="2dp" androID:padding="3dp" androID:background="@drawable/manager_fragment_popu_bg" androID:textcolor="@drawable/text_color_bg" androID:textSize="12sp"/></linearLayout>
3.--- item_popu_order_layout.xml中androID:background="@drawable/manager_fragment_popu_bg"对应的drawable文件为:
<?xml version="1.0" enCoding="utf-8"?><selector xmlns:androID="http://schemas.androID.com/apk/res/androID"> <item androID:drawable="@drawable/manager_fragment_popu_pressed" androID:state_selected="true" /> <item androID:drawable="@drawable/manager_fragment_popu_normal" androID:state_selected="false"/></selector>
manager_fragment_popu_pressed和manager_fragment_popu_normal对应的其实都是纯颜色xml文件。
manager_fragment_popu_pressed.xml代码如下:
<?xml version="1.0" enCoding="utf-8"?><shape xmlns:androID="http://schemas.androID.com/apk/res/androID" > <solID androID:color="@color/color_f5cc1d"></solID></shape>
manager_fragment_popu_normal.xml代码如下:
<?xml version="1.0" enCoding="utf-8"?><shape xmlns:androID="http://schemas.androID.com/apk/res/androID" > <solID androID:color="@color/transparent"></solID></shape>
也许有的同学会问androID:background="@drawable/manager_fragment_popu_bg文件中为什恶魔不直接用color属性设置背景切换,而要用color写个drawable供调用,其实我一开始也是这样弄的,无奈报错,具体原因不详,知道的同学可以回复下,此处不做重点。
4.--- item_popu_order_layout.xml中androID:textcolor="@drawable/text_color_bg"对应的drawable文件如下:
<?xml version="1.0" enCoding="utf-8"?><selector xmlns:androID="http://schemas.androID.com/apk/res/androID"> <item androID:color="@color/color_ff5b0a" androID:state_selected="true"/> <item androID:color="@color/black" androID:state_selected="false"/></selector>
5.---讲讲OrderPop的构造函数
public OrderPop(Context context,context); this.mDatas=datas; initVIEw(); initData(); setListener(); }
这里我其实是图方便,所以直接传了个固定宽度 ScreenUtil.dp2px(100,context) 进去了,实际开发中因为是点击某个控件然后在控件下面显示出来,那么应该传那个控件的宽度。
6.---OrderPop的layout布局pop_order.xml代码如下:
<?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="@color/color_c0c0c0"> <androID.support.v7.Widget.RecyclerVIEw androID:ID="@+ID/recycler_vIEw" androID:layout_wIDth="match_parent" androID:layout_height="match_parent" androID:scrollbars="vertical" androID:scrollbarThumbVertical="@color/blue" androID:scrollbarStyle="outsIDeOverlay"/></linearLayout>
其中,androID:scrollbars="vertical"是设置滚动条方向,androID:scrollbarThumbVertical="@color/blue"是设置滚动条颜色,androID:scrollbarStyle="outsIDeOverlay"设置滚动条样式
7.---讲讲OrderPop的显隐动画问题
在OrderPop类中的initData()方法中涉及到这样一行代码:
复制代码 代码如下:
setAnimationStyle(R.style.popuwindow_up_style);//popuwindow显示隐藏的动画
涉及到popuwindow的显隐动画问题,大家可以参考的前言中提到的popuwindow的基本使用文章,这里就不废话了。
第三步,OrderPop写好了,就该看看在MainActivity中是怎么调用的了,贴出MainActivity的代码:
/** * Created by admin on 2017/5/19. */public class MainActivity extends BaseActivity implements VIEw.OnClickListener{ @BindVIEw(R.ID.tv_order) TextVIEw mTvOrder; private static final int DEFAulT_INDEX=0; private List<String> mOrderList=new ArrayList<>(); private OrderPop mOrderPop; @OverrIDe protected int getContentVIEwID() { return R.layout.activity_main; } @OverrIDe protected voID initData() { initOrderTextbar(); } /**订单列表**/ private voID initOrderTextbar(){ mOrderList.add("野蛮人"); mOrderList.add("圣骑士"); mOrderList.add("亚马逊"); mOrderList.add("死灵法师"); mOrderList.add("法师"); mOrderList.add("德鲁伊"); mOrderList.add("刺客"); mOrderPop=new OrderPop(mContext,mOrderList); setbarContent(mTvOrder,mOrderList,DEFAulT_INDEX); mOrderPop.setondismissListener(new PopupWindow.OndismissListener() { @OverrIDe public voID ondismiss(){ mTvOrder.setSelected(false); } }); //mOrderPop项点击事件 mOrderPop.getAdapter().setonRecyclerItemClickListener(new ManagerPopuAdapter.OnRecyclerItemClickListener() { @OverrIDe public voID onRecyclerClick(int position) { showShortToast(mOrderList.get(position)); //更新mTvOrder显示内容 setbarContent(mTvOrder,position); //更新mOrderPop视图选中背景 mOrderPop.setCurrentIndex(position); mOrderPop.notifyDataSetChanged(); } }); } @OverrIDe protected voID setListener() { mTvOrder.setonClickListener(this); } @Nullable @OverrIDe protected BasePresenter getPresenter() { return null; } @OverrIDe protected voID onDestroy(){ super.onDestroy(); } @OverrIDe public voID onClick(VIEw v) { switch (v.getID()) { case R.ID.tv_order: if(mOrderPop!=null&&!mOrderPop.isShowing()){ mTvOrder.setSelected(true);//控制mTvOrder变色 mOrderPop.showAtLocationGravityBottom(mTvOrder,3);//显示mOrderPop //更新mOrderPop视图选中背景 mOrderPop.setCurrentIndex(getIndexByTag(mTvOrder)); mOrderPop.notifyDataSetChanged(); } break; default: break; } } private voID setbarContent(TextVIEw textVIEw,List<String>data,int position){ textVIEw.setTag(position); textVIEw.setText(data.get(position).toString()); } private int getIndexByTag(TextVIEw textVIEw){ int index=DEFAulT_INDEX; Object obj=textVIEw.getTag(); if(obj!=null){ try { index=Integer.valueOf(obj.toString()); } catch (NumberFormatException e) { e.printstacktrace(); } } return index; }}
MainActivity对应的布局activity_main.xml代码如下:
<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="match_parent" androID:background="@color/white" androID:gravity="center" androID:orIEntation="vertical"> <TextVIEw androID:ID="@+ID/tv_order" androID:layout_wIDth="80dp" androID:layout_height="wrap_content" androID:linespacingExtra="1dp" androID:linespacingMultiplIEr="1.0" androID:paddingleft="5dp" androID:paddingRight="5dp" androID:drawableRight="@drawable/manager_fragment_order_bg" androID:textcolor="@drawable/text_color_bg" androID:textSize="14sp"/></linearLayout>
androID:drawableRight="@drawable/manager_fragment_order_bg"中manager_fragment_order_bg.xml对应的代码如下:
<?xml version="1.0" enCoding="utf-8"?><selector xmlns:androID="http://schemas.androID.com/apk/res/androID"> <item androID:drawable="@mipmap/ic_drop_up" androID:state_selected="true" /> <item androID:drawable="@mipmap/ic_drop_down" androID:state_selected="false"/></selector>
ic_drop_up和ic_drop_down对应的分别是一张箭头向上的图片和一张箭头向下的图片,这里就不多说了。
androID:textcolor="@drawable/text_color_bg"的话是设置文字选中和未被选中时显示的颜色,在上面的第二步第四条已经讲过了,这里就不说了。
ok,整个实现过程大致就是这样的。今天关于PopuWindow实现下拉列表的知识就讲到这里了,谢谢诶。希望对大家的学习有所帮助,也希望大家多多支持编程小技巧。
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