如何在 Android 中创建半透明灰色教程叠加层?

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您知道当您第一次运行 Android 设备时(如果您使用模拟器，您会看到很多东西)，有一个关于如何使用启动器和添加小部件等的有用小教程.我正在尝试在谷歌上找到这样的例子，但我不能.我希望你明白我的意思.它是每一步都带有蓝色确定"按钮的那个.

无论如何，我想为我的应用创建一个，但我不确定哪种方法最好.

我是否可以创建一个 Fragment，在我的常规活动之上使其半透明，并让它仅在第一次运行时显示?

我是否为教程的每个部分制作一个半透明的 .png 并在第一次运行时将其覆盖在常规启动器活动上?

如果我选择后者，我该如何调整所有不同的屏幕尺寸?我可以在 Photoshop 中将图像渲染为各种尺寸，但这不会涵盖所有尺寸.如果我走片段路线，我可以说match_parent"而不必担心.但随后我必须弄清楚 Fragments 是如何工作的，它们让我很困惑.

解决方案

我认为这个开源库正是您要找的:

获取源代码和设置说明.

You know when you run an Android device for the first time (something you see a lot if you use the emulator) that there's a helpful little tutorial about how to use the launcher and add widgets, etc. I'm trying to find an example of this on Google, but I can't. I'm hoping you know what I mean. It's the one with the blue "okay" buttons at each step.

Anyway, I want to create one for my app, but I'm not sure which is the best way to go about doing it.

Do I create a Fragment that I can make semi-transparent on top of my regular activity and have it show up on only the first run?

Do I make a semi-transparent .png for each section of the tutorial and overlay it over the regular launcher activity on the first run?

If I do the latter, how can I adjust for all the various screen sizes? I could just render the image in Photoshop to various dimensions, but that won't cover all of them. If I go the fragment route, I can just say "match_parent" and not worry about it. But then I have to figure out how Fragments work, and they confuse the hell out of me.

解决方案

I think this open-source library is exactly what you're looking for:

Showcase View

You can grab the source code and setup instructions from GitHub.