PopupWindow 点击外部消失

需要点击返回键和点击popuwindown外部使popwindow消失

showAtLocation调用之前，设置以下此参数

popupWindow.setBackgroundDrawable(new BitmapDrawable());

// 设置点击窗口外边窗口消失

popupWindow.setOutsideTouchable(true);

// 设置此参数获得焦点，否则无法点击

popupWindow.setFocusable(true);

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:popupWindow.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);
    ......
}

总之添加背景图片就可以了:

popupWindow.setBackgroundDrawable(drawable);