Android studio 无法使用 Wrap 内容时，如何为不同屏幕尺寸的多种布局配置应用程序？

Question

I hit a brick wall trying to configure my app for multiple screens. I read a lot of information about it but so far I didn't manage to successfully do it. to begin with, I have to use hard-coded sizes for my buttons because there are many of them, 53 to be exact, and they have to be square, 40x40dp, and placed precisely on the layout. so I can't use wrap_content, fill_parent, etc' because then I can't fit all the buttons on the layout.

I've created 5 different layout 'activity_main.xml' with these screen configuration: normal_mdpi, large-hdpi, xlarge-xhdpi, xxhdpi, xxxhdpi. so far so good but if I don't apply (With the "device for preview" dropdown menu) a specific phone configuration to any of the layouts, then they won't fit on the screen. But then the layouts fit only for these phone configurations, they won't fit for one with a similar configuration but slightly different. what am I doing wrong? how many layouts do I need? do I need to create a layout for each phone out there?

Answer 1

You cannot use fixed sizes. I know you want to use fixed sizes, but you can't. Creating multiple layouts for each density is a common mistake. There is usually only one xml layout resource file for each activity, but there are exceptions when making really advanced layouts (fragments will be used).

How to fix the layouts

As the base layout inside the layout resource file, i suggest you use ConstraintLayout as it has a ton of potential and can easily make complex layouts. It will take some time to edit each view to make them use wrap_content or match_constraint ( match_constraint is basically match_parent but for ConstraintLayouts), but it is necessary. Android will then take care of resizing and fitting the views for any density/screen size if you use wrap_content and match_constraint ( match_parent for other base layouts like LinearLayout).

And remember, never use fixed sizes for views.