The following packages are not available

今天想看View.inflate(this, R.layout.name_pw, null);这个方法的源码，结果点击DownLoad：

All packages are not available for download!  The following packages are not available:
- Package id sources;android-32

studio提醒的已经很准确了，并非所有的包都可以下载！32这个版本的包就下载不到！
这个提示可以优化，前面那句根本不需要All packages are not available for download!一开始我还以为是所有的包都不能下载呢！！
解决：用30的版本就好了
在build.gradle中增加

   compileSdkVersion 30buildToolsVersion '30.0.2'

或者
Project structure —modules–点击下拉菜单右边的不显眼图标更改

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