怎么在Android应用中利用PopuWindow实现一个下拉列表功能
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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弹出框 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, 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]+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, 0, 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, 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] - 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, 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() + 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") protectedT 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 ** Author:pei * Date: 2017/6/28 * Description: */ public class OrderPop extends BasePopupWindow{ private RecyclerView mRecyclerView; private List
mDatas; private ManagerPopuAdapter managerPopuAdapter; public OrderPop(Context context, List datas) { super(ScreenUtil.dp2px(100,context), ScreenUtil.dp2px(150,context), 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 (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 ** Author:pei * Date: 2017/6/29 * Description: */ public class ManagerPopuAdapter
extends RecyclerView.Adapter { protected Context mContext; protected View mLayoutView; protected List mData; private ViewHolder mViewHolder; protected OnRecyclerItemClickListener mOnRecyclerItemClickListener; private int mIndex; public void setOnRecyclerItemClickListener(OnRecyclerItemClickListener onRecyclerItemClickListener) { this.mOnRecyclerItemClickListener = onRecyclerItemClickListener; } public ManagerPopuAdapter(Context context, List 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"?>
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"?>
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"?>
manager_fragment_popu_normal.xml代码如下:
<?xml version="1.0" encoding="utf-8"?>
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"?>
5.---讲讲OrderPop的构造函数
public OrderPop(Context context, Listdatas) { super(ScreenUtil.dp2px(100,context), ScreenUtil.dp2px(150,context), R.layout.pop_order, 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"?>
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:
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 ListmOrderList=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,mOrderList,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 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:
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"?>
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。
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文章名称:怎么在Android应用中利用PopuWindow实现一个下拉列表功能
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