[TOC] 在android4.0/5.0系统上,使用popupWindow时,点击内容外部区域无法关闭,但是在6.0机子上又是正常的,而我在代码中明明已经进行了如下设置:
mPopupWindow = new PopupWindow(popView, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT, true);// 点击其他地方消失mPopupWindow.setOutsideTouchable(true);复制代码
google了一下都说要添加一句:
mPopupWindow.setBackgroundDrawable(new BitmapDrawable());复制代码
测试了果然ok,不过还是想知道下所以然,稍微探究一下: 既然是点击没效果,搜索一下touch事件好了: 在4.0/5.0的 PopupWindow.java 源码中发现是在 PopupViewContainer 类中设置的,而在6.0源码中则是位于 PopupDecorView 类;
继续查找在哪里初始化的,发现 preparePopup(),它是在显示(showAtLocation() , showAsDropDown())的时候调用的,而 preparePopup() 的具体内容:
// PopupWindow.java @ api 14/19/21private void preparePopup(WindowManager.LayoutParams p) { if (mContentView == null || mContext == null || mWindowManager == null) { throw new IllegalStateException("You must specify a valid content view by " + "calling setContentView() before attempting to show the popup."); } if (mBackground != null) { final ViewGroup.LayoutParams layoutParams = mContentView.getLayoutParams(); int height = ViewGroup.LayoutParams.MATCH_PARENT; if (layoutParams != null && layoutParams.height == ViewGroup.LayoutParams.WRAP_CONTENT) { height = ViewGroup.LayoutParams.WRAP_CONTENT; } // when a background is available, we embed the content view // within another view that owns the background drawable PopupViewContainer popupViewContainer = new PopupViewContainer(mContext); PopupViewContainer.LayoutParams listParams = new PopupViewContainer.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, height ); popupViewContainer.setBackgroundDrawable(mBackground); popupViewContainer.addView(mContentView, listParams); mPopupView = popupViewContainer; } else { mPopupView = mContentView; } mPopupWidth = p.width; mPopupHeight = p.height;}复制代码 这里可以看到当background不为null的时候,在contentView外面套了一层PopupViewContainer,而PopupViewContainer中才有关于touch,key的监听事件,因此若未设置背景,则点击外部区域无法取消popupwindow,即使设置了:
mPopupWindow.setOutsideTouchable(true);复制代码
而在android6.0中:
// PopupWindow.java @ api 23private void preparePopup(WindowManager.LayoutParams p) { ...... // When a background is available, we embed the content view within // another view that owns the background drawable. if (mBackground != null) { mBackgroundView = createBackgroundView(mContentView); mBackgroundView.setBackground(mBackground); } else { mBackgroundView = mContentView; } // 无论background是否为空,都会创建decorView,它是PopupDecorView的实例,其实就是一个FrameLayout,里面有touch事件的监听,因此无需设置背景也可以点击外部区域取消popupwindow的 mDecorView = createDecorView(mBackgroundView); ......}复制代码 总之,跟网友说的一致,添加背景图片就可以了:
Bitmap bmp = BitmapFactory.decodeResource(getContext().getResources(), R.drawable.bg_popup_window);Drawable drawable = new BitmapDrawable(getContext().getResources(), bmp);// 不带参的方法已经deprecatedpopupWindow.setBackgroundDrawable(drawable);复制代码