Android Studio无法使用Apache的HttpClient

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　　你可能需要把以前的项目从Eclipse移到Android Studio, 如果你使用了HttpClient以及和他相关的开源框架, 恭喜你, 可能会报一下错,
这里写图片描述

这么大的事, 官方也给了解决方案:
官方文档: Android 6.0 Changes
http://developer.android.com/intl/zh-cn/about/versions/marshmallow/android-6.0-changes.html#behavior-apache-http-client

Apache HTTP Client Removal

　　Android 6.0 release removes support for the Apache HTTP client. If your app is using this client and targets Android 2.3 (API level 9) or higher, use the HttpURLConnection class instead. This API is more efficient because it reduces network use through transparent compression and response caching, and minimizes power consumption. To continue using the Apache HTTP APIs, you must first declare the following compile-time dependency in your build.gradle file:

android {    useLibrary 'org.apache.http.legacy'}

　　大概就是删除了HttpClient, 用HttpURLConnection替代, 巴拉巴拉…. 如果还要继续使用Apache HTTP API, 需要在Module的build.gradle里面配置这句:

android {     useLibrary 'org.apache.http.legacy'}

在然后就能用HttpClient了

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