5.4 You grant to the user a non-exclusive, worldwide, and perpetual license to perform, display, and use the Product on the Device. If you choose, you may include a separate end user license agreement (EULA) in your Product that will govern the user's rights to the Product in lieu of the previous sentence.
So you're giving the user the right to use the product. If you think it's necessary to include further legal protections, you have the option to include a EULA that describes them.
You've probably noticed that most apps don't have a EULA.
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这是Android 开发者分发协议。它指出：
因此，您授予用户使用该产品的权利。如果您认为有必要包含进一步的法律保护，您可以选择包含描述它们的 EULA。
您可能已经注意到，大多数应用程序都没有 EULA。
快速 Google 搜索 显示此页面介绍如何添加 EULA到您的应用程序。
哦，您不受任何协议（例如 GPL）的约束来发布应用程序的源代码。因此，如果您不愿意，则不必这样做。
（免责声明：我不是律师。）
Here is the Android Developer Distribution Agreement. It states:
So you're giving the user the right to use the product. If you think it's necessary to include further legal protections, you have the option to include a EULA that describes them.
You've probably noticed that most apps don't have a EULA.
A quick Google search shows this page about how to add a EULA to your app.
Oh, and you're not bound by any agreement, like the GPL, to release the source code for your app. So you don't have to do that if you don't want to.
(Disclaimer: I am not a lawyer.)