激活Android PopupWindow时背景模糊或暗淡

Question

当我使用来显示弹出窗口时，我希望能够使背景模糊或变暗popup.showAtLocation，并在popup.dismiss调用时取消模糊/暗淡背景。

我曾尝试应用布局PARAMS FLAG_BLUR_BEHIND和FLAG_DIM_BEHIND我的活动，但是这似乎只是模糊和朦胧的背景，一旦我的应用程序已启动。

我如何仅使用弹出窗口进行模糊/变暗？

Answer 1

由于PopupWindow只是增加了一个View到WindowManager你可以使用updateViewLayout (View view, ViewGroup.LayoutParams params)更新LayoutParams您的PopupWindow的contentView调用演出后..（）。设置窗口标记FLAG_DIM_BEHIND将使窗口后面的所有内容变暗。使用dimAmount以控制暗淡的（1.0完全不透明到0.0为无暗淡）的量。请记住，如果您为背景设置背景，PopupWindow则会将其放入contentView容器中，这意味着您需要更新其父级。有背景：PopupWindow popup = new PopupWindow(contentView, width, height);popup.setBackgroundDrawable(background);popup.showAsDropDown(anchor);View container = (View) popup.getContentView().getParent();WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);WindowManager.LayoutParams p = (WindowManager.LayoutParams) container.getLayoutParams();// add flagp.flags |= WindowManager.LayoutParams.FLAG_DIM_BEHIND;p.dimAmount = 0.3f;wm.updateViewLayout(container, p);没有背景：PopupWindow popup = new PopupWindow(contentView, width, height);popup.setBackgroundDrawable(null);popup.showAsDropDown(anchor);WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);WindowManager.LayoutParams p = (WindowManager.LayoutParams) contentView.getLayoutParams();// add flagp.flags |= WindowManager.LayoutParams.FLAG_DIM_BEHIND;p.dimAmount = 0.3f;wm.updateViewLayout(contentView, p);棉花糖更新：在M上，PopupWindow将contentView包裹在一个名为mDecorView的FrameLayout中。如果您深入研究PopupWindow源，您会发现类似createDecorView(View contentView).mDecorView的主要目的是处理事件分发和内容转换，这是M的新增功能。这意味着我们需要再添加一个.getParent（）来访问容器。背景需要更改为以下内容：View container = (View) popup.getContentView().getParent().getParent();API 18+的更好替代使用以下方法的解决方案ViewGroupOverlay：1）保留所需的根目录布局ViewGroup root = (ViewGroup) getWindow().getDecorView().getRootView();2）致电applyDim(root, 0.5f);或clearDim()public static void applyDim(@NonNull ViewGroup parent, float dimAmount){    Drawable dim = new ColorDrawable(Color.BLACK);    dim.setBounds(0, 0, parent.getWidth(), parent.getHeight());    dim.setAlpha((int) (255 * dimAmount));    ViewGroupOverlay overlay = parent.getOverlay();    overlay.add(dim);}public static void clearDim(@NonNull ViewGroup parent) {    ViewGroupOverlay overlay = parent.getOverlay();    overlay.clear();}

Answer 2

在您的xml文件中，添加宽度和高度为“ match_parent”的类似内容。<RelativeLayout&nbsp; &nbsp; &nbsp; &nbsp; android:id="@+id/bac_dim_layout"&nbsp; &nbsp; &nbsp; &nbsp; android:layout_width="match_parent"&nbsp; &nbsp; &nbsp; &nbsp; android:layout_height="match_parent"&nbsp; &nbsp; &nbsp; &nbsp; android:background="#C0000000"&nbsp; &nbsp; &nbsp; &nbsp; android:visibility="gone" ></RelativeLayout>在您的活动中//setting background dim when showing popupback_dim_layout = (RelativeLayout) findViewById(R.id.share_bac_dim_layout);最后，在显示popupwindow时使其可见，并在退出popupwindow时使其不可见。back_dim_layout.setVisibility(View.VISIBLE);back_dim_layout.setVisibility(View.GONE);