android开发常见错误及解决办法

1、

新建项目报错：

Error:Could not resolve all files for configuration ':app:debugCompileClasspath'.
> Could not resolve com.android.support:appcompat-v7:26.0.0-beta1.
  Required by:
      project :app
   > Could not resolve com.android.support:appcompat-v7:26.0.0-beta1.
      > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/support/appcompat-v7/26.0.0-beta1/appcompat-v7-26.0.0-beta1.pom'.
         > Could not HEAD 'https://dl.google.com/dl/android/maven2/com/android/support/appcompat-v7/26.0.0-beta1/appcompat-v7-26.0.0-beta1.pom'.
            > Connect to dl.google.com:443 [dl.google.com/203.208.46.146] failed: Connection timed out: connect

问题原因：gradle配置问题

解决办法：为AndroidStudio配置阿里云镜像地址，加速依赖资源下载

https://www.jianshu.com/p/6dd91849138b

https://blog.youkuaiyun.com/jiangzhenlove/article/details/75334314