简书链接:原创android利用反射禁止popwindow截屏（做键盘开发）
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            try {
                Field windowManagerField = PopupWindow.class.getDeclaredField("mWindowManager");
                windowManagerField.setAccessible(true);
                final Object o = windowManagerField.get(mPreviewPopup);

                Object windowManagerProy = Proxy.newProxyInstance(Handler.class.getClassLoader(), new Class[]{WindowManager.class}, new InvocationHandler() {

                    @Override
                    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
//                    if(    public void addView(View view, ViewGroup.LayoutParams params);)
                        if (method.getName().equals("addView") && args.length == 2) {
                            PopupWrapper.this.mDecorView = args[0];
                            PopupWrapper.this.mWindowParams = (WindowManager.LayoutParams) args[1];
                            PopupWrapper.this.screenShot(mSafeEditView.isDisableCatupreScreen());
                        }
                        return method.invoke(o, args);
                    }
                });
                windowManagerField.set(mPreviewPopup, windowManagerProy);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (NoSuchFieldException e) {
                e.printStackTrace();
            }

     public void screenShot(boolean disableCapture) {
            if (disableCapture) {
                addFlags(WindowManager.LayoutParams.FLAG_SECURE);

            } else {
                clearFlags(WindowManager.LayoutParams.FLAG_SECURE);//避免导致 吧activity的防止截屏给取消了。理论上 activity设置就ok了。

            }

        }

        public WindowManager.LayoutParams getAttributes() {
            return mWindowParams;
        }

        public void clearFlags(int flags) {
            setFlags(0, flags);
        }

        public void setFlags(int flags, int mask) {
            final WindowManager.LayoutParams attrs = getAttributes();
            if (attrs == null) {
                return;
            }
            attrs.flags = (attrs.flags & ~mask) | (flags & mask);
        }

        public void addFlags(int flags) {
            setFlags(flags, flags);
        }