Android：PopupWindow

转于：http://my.oschina.net/xsjayz/blog/184848#OSC_h2_5

 

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摘要 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.

PopupWindow

 

目录[-]

• 一、概述
• 1、构造方法
• 二、初始化PopupWindow
• 三、创建一个PopupWindow
• 四、显示
• 五、popupWindow显示优化
•     1、动画效果
•     2、其他效果

一、概述

1、构造方法

部分常用：

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PopupWindow(View contentView, int width, int height) Create a new non focusable popup window which can display the contentView. PopupWindow(View contentView, int width, int height, boolean focusable) Create a new popup window which can display the contentView.

contentView为要显示的view，width和height为宽和高，值为像素值，也可以是MATCHT_PARENT和WRAP_CONTENT。

focusable为是否可以获得焦点，也可以通过set方法设置：

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1 2	// Changes the focusability of the popup window setFocusable(boolean focusable)

 

根据网上的资料，focusable参数的主要作用是：

如果focusable为false，在一个Activity弹出一个PopupWindow，按返回键，由于PopupWindow没有焦点，会直接退出Activity。如果focusable为true，PopupWindow弹出后，所有的触屏和物理按键都由PopupWindow处理。

如果PopupWindow中有Editor的话，focusable要为true。

 

二、初始化PopupWindow

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/**  * 初始化rightPopupWindow  */ private PopupWindow initPopupWindow() {       LayoutInflater inflater = LayoutInflater.from(this);     View popView = inflater.inflate(R.layout.popupwindow_content, null);     TextView item = (TextView) popView.findViewById(R.id.text_item);               // 创建PopupWindow     final PopupWindow popupWindow = createPopupWindow(popView);       popView.setOnTouchListener(new View.OnTouchListener() {         @Override         public boolean onTouch(View v, MotionEvent event) {             if (rightPop != null && rightPop.isShowing()) {                 popupWindow.dismiss();             }             return true;         }     });       item.setOnClickListener(new View.OnClickListener() {         @Override         public void onClick(View v) {             popupWindow.dismiss();             // ...         }     });               return popupWindow; }

三、创建一个PopupWindow

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/**  * 创建PopupWindow  *  * @param popView  *            指定PopupWindow的内容  */ private PopupWindow createPopupWindow(View popView) {       PopupWindow popupInstance = new PopupWindow(popView, LayoutParams.MATCH_PARENT,             LayoutParams.MATCH_PARENT);     popupInstance.setFocusable(true);     popupInstance.setBackgroundDrawable(new ColorDrawable(0));     popupInstance.setOutsideTouchable(true);     // 监听器     popupInstance.setOnDismissListener(new PopupWindow.OnDismissListener() {         @Override         public void onDismiss() {             // ...         }     });       return popupInstance; }

 

四、显示

 例如一个button，点击该按钮，显示popupWindow，并且要求popupWindow显示在该按钮下面，则

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btn.setOnClickListener(new View.OnClickListener() {     @Override     public void onClick(View v) {         PopupWindow popupWindow = ...;         popupWindow.showAsDropDown(v);     } });

另外，还支持指定位+置偏移量显示：

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1	public void showAsDropDown(View anchor, int xoff, int yoff);

 

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public void showAtLocation (View parent, int gravity, int x, int y)   Display the content view in a popup window at the specified location. If the popup window cannot fit on screen, it will be clipped. See WindowManager.LayoutParams for more information on how gravity and the x and y parameters are related. Specifying a gravity of NO_GRAVITY is similar to specifying Gravity.LEFT | Gravity.TOP.   Parameters parent  a parent view to get the getWindowToken() token from gravity the gravity which controls the placement of the popup window x   the popup's x location offset y   the popup's y location offset

 

五、popupWindow显示优化

    1、动画效果

     例如显示的时候，从底部出现或者从顶部出现等，可以添加自定义动画效果。

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<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" >       <translate         android:duration="250"         android:fromYDelta="100.0%"         android:toYDelta="0.0" />   </set>

 

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<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" >       <translate         android:duration="250"         android:fromYDelta="0.0"         android:toYDelta="100%" />   </set>

 

 

    2、其他效果

     默认的popupWindow显示的时候，是没有像Dialog那样的背景变成灰色半透明效果的。可以自己添加类似Dialog或ios那样的效果。

    例如，设置popupWindow的显示内容的布局文件的background属性为灰色半透明颜色，然后popupWindow在创建的时候指定宽、高属性为MATCH_PARENT即可实现除了popupWindow以外区域变成灰色半透明效果。

    当然，这个灰色区域，其实也属于popupWindow，只是没有真正的内容。这时候如果需要设置点击popupWindow以外区域让它自动消失的话，就需要额外处理。因为点击灰色部分，你仍然点击的是popupWindow本身。

    一种方法是给popupWindow的整个布局区域添加onTouch事件监听器，手动让popupWindow去dismiss()掉。