[Android]PopupWindow 点击外部区域无法关闭的问题
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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);
google了一下都说要添加一句:
mPopupWindow.setBackgroundDrawable(new BitmapDrawable());
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 14/19/21
private 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;
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);
而在android6.0中:
// PopupWindow.java @ api 23
private 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);
......
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deprecated
popupWindow.setBackgroundDrawable(drawable);
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