[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);

点击外部区域不关闭

红色区域是popupwindow内容区域

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 14/19/21private 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;}

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 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);    ......}

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);

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