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        显示一个 PopupWindow 集中

        时间:2024-04-14

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                1. 本文介绍了显示一个 PopupWindow 集中的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  I have some popups on my app, it's fullscreen and the following code:

                      content.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
                              LayoutParams.WRAP_CONTENT));
                      content.measure(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
                      int screenWidth = windowManager.getDefaultDisplay().getWidth();
                      int screenHeight = windowManager.getDefaultDisplay().getHeight();
                      int x = screenWidth / 2 - content.getMeasuredWidth() / 2;
                      int y = screenHeight / 2 - content.getMeasuredHeight() / 2;
                      window.showAtLocation(content, Gravity.NO_GRAVITY, x, y);
                  

                  Make the window show centered.

                  But I have another Activity which is not fullscreen, when the popup opens it's right-down from where it's need to be.

                  Trying to figure out why this happens, I think the showAtLocation shows it's relative to the current Activity, but I need to show it relative to the display.

                  How can I do that? Or there's a simpler way to just the popup just centered?

                  解决方案

                  popupWindow.showAtLocation(anyViewOnlyNeededForWindowToken, Gravity.CENTER, 0, 0);
                  

                  This will center your view.

                  It took me 2 hours of pain to figure this out. I didn't need any black magic maths to handle this.

                  The view is only needed for the window token, it has no other impact on the location.

                  Gravity tells the layout manager where to start the coordinate system and how to treat those coordinates. I can't find the docs but hacking is showing me that:

                  • CENTER uses the middle of the popup to be aligned to the x,y specified. So 0,0 is screen centered
                  • BOTTOM uses the bottom of the popup to be aligned to the x,y specified. So 0,0 has the popup bottom aligned with the screen bottom. If you want 10px padding then y=10 (not -10) to move the popup up the screen 10 pixels.

                  I wrote this up over here Android PopupWindow.showAtLocation() and effects of Gravity

                  这篇关于显示一个 PopupWindow 集中的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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