通用PopupWindow，几行代码搞定PopupWindow弹窗
Dominic19I
8年前
<p>我们都知道，Android 中的弹窗基本有两种，一种是AlertDialog，另一种是PopupWindow，AlertDialog的显示位置是固定的，PopWindow 的显示位置是我们可以设置和调整的，因此，像项目中的一些场景如：某个功能的提示说明、点击按钮在按钮上方或者下方弹出菜单、新功能弹窗引导等。由于这些弹窗的位置不固定，因此都可以用PopupWindow来做。最近项目中也用到了PopupWindow弹窗功能，在写的过程中，发现虽然API比较简单，但是写一个PopupWindow，还是有点繁琐，很多重复代码，决定简单封装一下，以后添加一个弹窗就不用那么麻烦了，几行代码就搞定了。本篇文章是对项目中使用 PopupWindow做一个笔记和总结。</p> <p><strong>一、首先先看一下效果图</strong></p> <p>效果图：</p> <p style="text-align:center"><img src="https://simg.open-open.com/show/d31062723aaaa6bb60b7b7303e7c36ee.gif"></p> <p style="text-align:center">popWindow.gif</p> <p>以上示例展示了4中PopupWindow 使用场景</p> <p><strong>二、PopupWindow 简单介绍</strong></p> <p>首先看一下Google 官方文档对PopupWindow的介绍：</p> <p>This class represents a popup window that can be used to display an arbitrary view. The popup window is a floating container that appears on top of the current activity.</p> <p>大致意思就是：popup window 是一个出现在当前Activity顶层的悬浮容器，可以用来展示任意的View。</p> <p>因此只要是个View，都可以用PopupWindow 来展示。这里我就不过多介绍PopupWindow 的API，挑几个重要并且常用的说一下：</p> <p>1,构造函数，这个不用多说，多个重载函数，穿不同的参数。</p> <pre> <code class="language-java">public PopupWindow(int width, int height) public PopupWindow(View contentView, int width, int height) public PopupWindow(View contentView, int width, int height, boolean focusable)</code></pre> <p>2，设置显示的View：</p> <pre> <code class="language-java">public void setContentView(View contentView)</code></pre> <p>3,设置展示的宽、高，构造函数传了宽高就不用重新设置</p> <pre> <code class="language-java">// 设置宽，其实构造函数也是调用的这个方法 public void setWidth(int width) //设置高 public void setHeight(int height)</code></pre> <p>4，设置是否获取焦点</p> <pre> <code class="language-java">public void setFocusable(boolean focusable)</code></pre> <p>5,设置点击PopupWindow 以外区域是否可以隐藏PopupWindow</p> <pre> <code class="language-java">public void setOutsideTouchable(boolean touchable)</code></pre> <p>注意：这里要注意一下，有时侯我们希望触摸PopupWindow 以外区域就隐藏PopupWindow,理论上我们只需要调用 setOutsideTouchable(ture)设置为ture就可以了，但是实际上只设置这个属性是不行的，必须设置背景，也就是说要和setBackgroundDrawable(Drawable background)同时使用才有效，不然，点击PopupWindow以外区域是不能隐藏掉的。</p> <p>6，隐藏PopupWindow</p> <pre> <code class="language-java">public void dismiss()</code></pre> <p>7,设置dissmiss 回调监听</p> <pre> <code class="language-java">public void setOnDismissListener(OnDismissListener onDismissListener)</code></pre> <p>8,显示PopupWindow</p> <pre> <code class="language-java">//直接显示在参照View 的左下方 public void showAsDropDown(View anchor) // 显示在参照View的左下方，可以通过xoff，yOff,来调节x,y方向的偏移 public void showAsDropDown(View anchor, int xoff, int off) public void showAsDropDown(View anchor, int xoff, int yoff, int gravity) //显示在指定位置，相对于整个屏幕的window而言，通过gravity调解显示在左、上、右、下、中. x,y调整两个方向的偏移 public void showAtLocation(View parent, int gravity, int x, int y)</code></pre> <p>以上就是PopupWindow 重要的并且常用的API。</p> <p><strong>三、封装通用PopupWindow,CustomPopWindow,使用链式的方式配置并显示</strong></p> <p>由于每次写PopupWindow都要写很多重复代码，因此简单的封装了一个CustomPopWindow.封装了PopupWindow 的一些常用API，使用Builder模式，就像写AlertDialog 一样，链式配置。</p> <p>使用方法：</p> <p>1，简便写法：</p> <pre> <code class="language-java">CustomPopWindow popWindow = new CustomPopWindow.PopupWindowBuilder(this) .setView(R.layout.pop_layout1)//显示的布局，还可以通过设置一个View // .size(600,400) //设置显示的大小，不设置就默认包裹内容 .setFocusable(true)//是否获取焦点，默认为ture .setOutsideTouchable(true)//是否PopupWindow 以外触摸dissmiss .create()//创建PopupWindow .showAsDropDown(mButton1,0,10);//显示PopupWindow</code></pre> <p>以上就是弹出一个简单的PopupWindow，是不是看起来很优雅和简单，还可以简单一点：</p> <pre> <code class="language-java">CustomPopWindow popWindow = new CustomPopWindow.PopupWindowBuilder(this) .setView(R.layout.pop_layout1)//显示的布局 .create()//创建PopupWindow .showAsDropDown(mButton1,0,10);//显示PopupWindow</code></pre> <p>如果是一个简单的只展示文案的弹窗，就可以只设置一个View，就可以了，很简单吧！！！</p> <p>2，展示一个PopupWindow 弹窗菜单（像手机QQ，微信的顶部菜单）</p> <pre> <code class="language-java">View contentView = LayoutInflater.from(this).inflate(R.layout.pop_menu,null); //处理popWindow 显示内容 handleLogic(contentView); //创建并显示popWindow mCustomPopWindow= new CustomPopWindow.PopupWindowBuilder(this) .setView(contentView) .create() .showAsDropDown(mButton3,0,20);</code></pre> <p>如果PopupWindow 展示的内容需要在程序代码中设置或者响应点击事件等，可以现获取到这个View，然后处理一些显示和点击事件逻辑，再交给CustomPopWindow 创建显示。比如响应菜单点击事件的逻辑处理：</p> <pre> <code class="language-java">/** * 处理弹出显示内容、点击事件等逻辑 * @param contentView */ private void handleLogic(View contentView){ View.OnClickListener listener = new View.OnClickListener() { @Override public void onClick(View v) { if(mCustomPopWindow!=null){ mCustomPopWindow.dissmiss(); } String showContent = ""; switch (v.getId()){ case R.id.menu1: showContent = "点击 Item菜单1"; break; case R.id.menu2: showContent = "点击 Item菜单2"; break; case R.id.menu3: showContent = "点击 Item菜单3"; break; case R.id.menu4: showContent = "点击 Item菜单4"; break; case R.id.menu5: showContent = "点击 Item菜单5" ; break; } Toast.makeText(MainActivity.this,showContent,Toast.LENGTH_SHORT).show(); } }; contentView.findViewById(R.id.menu1).setOnClickListener(listener); contentView.findViewById(R.id.menu2).setOnClickListener(listener); contentView.findViewById(R.id.menu3).setOnClickListener(listener); contentView.findViewById(R.id.menu4).setOnClickListener(listener); contentView.findViewById(R.id.menu5).setOnClickListener(listener); } }</code></pre> <p>3,展示一个ListView,其实跟上面是一样的，这里贴一下实例代码：</p> <pre> <code class="language-java">private void showPopListView(){ View contentView = LayoutInflater.from(this).inflate(R.layout.pop_list,null); //处理popWindow 显示内容 handleListView(contentView); //创建并显示popWindow mListPopWindow= new CustomPopWindow.PopupWindowBuilder(this) .setView(contentView) .size(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT)//显示大小 .create() .showAsDropDown(mButton4,0,20); } private void handleListView(View contentView){ RecyclerView recyclerView = (RecyclerView) contentView.findViewById(R.id.recyclerView); LinearLayoutManager manager = new LinearLayoutManager(this); manager.setOrientation(LinearLayoutManager.VERTICAL); recyclerView.setLayoutManager(manager); MyAdapter adapter = new MyAdapter(); adapter.setData(mockData()); recyclerView.setAdapter(adapter); adapter.notifyDataSetChanged(); }</code></pre> <p>以上就是对于 PopupWindow的封装和使用示例。封装了PopupWindow 常用的API，没有展示完全，还有像添加显示和隐藏动画setAnimationStyle(int animationStyle)，隐藏回调监听等等。需要的朋友自己试试。</p> <p>最后，贴出CustomPopWindow的源码：</p> <pre> <code class="language-java">/** * * 自定义PopWindow类，封装了PopWindow的一些常用属性，用Builder模式支持链式调用 * Created by zhouwei on 16/11/28. */ public class CustomPopWindow { private Context mContext; private int mWidth; private int mHeight; private boolean mIsFocusable = true; private boolean mIsOutside = true; private int mResLayoutId = -1; private View mContentView; private PopupWindow mPopupWindow; private int mAnimationStyle = -1; private boolean mClippEnable = true;//default is true private boolean mIgnoreCheekPress = false; private int mInputMode = -1; private PopupWindow.OnDismissListener mOnDismissListener; private int mSoftInputMode = -1; private boolean mTouchable = true;//default is ture private View.OnTouchListener mOnTouchListener; private CustomPopWindow(Context context){ mContext = context; } public int getWidth() { return mWidth; } public int getHeight() { return mHeight; } /** * * @param anchor * @param xOff * @param yOff * @return */ public CustomPopWindow showAsDropDown(View anchor, int xOff, int yOff){ if(mPopupWindow!=null){ mPopupWindow.showAsDropDown(anchor,xOff,yOff); } return this; } public CustomPopWindow showAsDropDown(View anchor){ if(mPopupWindow!=null){ mPopupWindow.showAsDropDown(anchor); } return this; } @RequiresApi(api = Build.VERSION_CODES.KITKAT) public CustomPopWindow showAsDropDown(View anchor, int xOff, int yOff, int gravity){ if(mPopupWindow!=null){ mPopupWindow.showAsDropDown(anchor,xOff,yOff,gravity); } return this; } /** * 相对于父控件的位置（通过设置Gravity.CENTER，下方Gravity.BOTTOM等 ），可以设置具体位置坐标 * @param parent * @param gravity * @param x the popup's x location offset * @param y the popup's y location offset * @return */ public CustomPopWindow showAtLocation(View parent, int gravity, int x, int y){ if(mPopupWindow!=null){ mPopupWindow.showAtLocation(parent,gravity,x,y); } return this; } /** * 添加一些属性设置 * @param popupWindow */ private void apply(PopupWindow popupWindow){ popupWindow.setClippingEnabled(mClippEnable); if(mIgnoreCheekPress){ popupWindow.setIgnoreCheekPress(); } if(mInputMode!=-1){ popupWindow.setInputMethodMode(mInputMode); } if(mSoftInputMode!=-1){ popupWindow.setSoftInputMode(mSoftInputMode); } if(mOnDismissListener!=null){ popupWindow.setOnDismissListener(mOnDismissListener); } if(mOnTouchListener!=null){ popupWindow.setTouchInterceptor(mOnTouchListener); } popupWindow.setTouchable(mTouchable); } private PopupWindow build(){ if(mContentView == null){ mContentView = LayoutInflater.from(mContext).inflate(mResLayoutId,null); } if(mWidth != 0 && mHeight!=0 ){ mPopupWindow = new PopupWindow(mContentView,mWidth,mHeight); }else{ mPopupWindow = new PopupWindow(mContentView, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); } if(mAnimationStyle!=-1){ mPopupWindow.setAnimationStyle(mAnimationStyle); } apply(mPopupWindow);//设置一些属性 mPopupWindow.setFocusable(mIsFocusable); mPopupWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT)); mPopupWindow.setOutsideTouchable(mIsOutside); if(mWidth == 0 || mHeight == 0){ mPopupWindow.getContentView().measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED); //如果外面没有设置宽高的情况下，计算宽高并赋值 mWidth = mPopupWindow.getContentView().getMeasuredWidth(); mHeight = mPopupWindow.getContentView().getMeasuredHeight(); } mPopupWindow.update(); return mPopupWindow; } /** * 关闭popWindow */ public void dissmiss(){ if(mPopupWindow!=null){ mPopupWindow.dismiss(); } } public static class PopupWindowBuilder{ private CustomPopWindow mCustomPopWindow; public PopupWindowBuilder(Context context){ mCustomPopWindow = new CustomPopWindow(context); } public PopupWindowBuilder size(int width,int height){ mCustomPopWindow.mWidth = width; mCustomPopWindow.mHeight = height; return this; } public PopupWindowBuilder setFocusable(boolean focusable){ mCustomPopWindow.mIsFocusable = focusable; return this; } public PopupWindowBuilder setView(int resLayoutId){ mCustomPopWindow.mResLayoutId = resLayoutId; mCustomPopWindow.mContentView = null; return this; } public PopupWindowBuilder setView(View view){ mCustomPopWindow.mContentView = view; mCustomPopWindow.mResLayoutId = -1; return this; } public PopupWindowBuilder setOutsideTouchable(boolean outsideTouchable){ mCustomPopWindow.mIsOutside = outsideTouchable; return this; } /** * 设置弹窗动画 * @param animationStyle * @return */ public PopupWindowBuilder setAnimationStyle(int animationStyle){ mCustomPopWindow.mAnimationStyle = animationStyle; return this; } public PopupWindowBuilder setClippingEnable(boolean enable){ mCustomPopWindow.mClippEnable =enable; return this; } public PopupWindowBuilder setIgnoreCheekPress(boolean ignoreCheekPress){ mCustomPopWindow.mIgnoreCheekPress = ignoreCheekPress; return this; } public PopupWindowBuilder setInputMethodMode(int mode){ mCustomPopWindow.mInputMode = mode; return this; } public PopupWindowBuilder setOnDissmissListener(PopupWindow.OnDismissListener onDissmissListener){ mCustomPopWindow.mOnDismissListener = onDissmissListener; return this; } public PopupWindowBuilder setSoftInputMode(int softInputMode){ mCustomPopWindow.mSoftInputMode = softInputMode; return this; } public PopupWindowBuilder setTouchable(boolean touchable){ mCustomPopWindow.mTouchable = touchable; return this; } public PopupWindowBuilder setTouchIntercepter(View.OnTouchListener touchIntercepter){ mCustomPopWindow.mOnTouchListener = touchIntercepter; return this; } public CustomPopWindow create(){ //构建PopWindow mCustomPopWindow.build(); return mCustomPopWindow; } } }</code></pre> <p>好了，本篇文章到此结束，以上就是PopupWindow的一些介绍和一个简单的封装。</p> <p> </p> <p>来自：http://www.jianshu.com/p/9304d553aa67</p> <p> </p>