android studio运行时提示All packages are not available for download! the following package are not availa

android studio运行时提示

All packages are not available for download!
the following package are not available;

 -Package id system-images;android-19;default;armeabi-v7a


原因:

我解决办法,之前为了修改了host文件,里面就有google的站点,域名对应着ip地址,过了一段时间肯定就变了,所以下载不了SDK。把host文件里面内容删除就是了。用switchhost切换到新host即可



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