安卓6版本中删除Apache HTTP客户端支持

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'
}

上面是官网的内容 ，大概的意思是Android 6.0   移除了Apache HTTP client.   建议使用优化过的  HttpURLConnection 来代替。如果要继续使用Apache HTTP 的api的话

需要加入这个

android {

    useLibrary 'org.apache.http.legacy'

}

官网出处地址:  https://developer.android.com/about/versions/marshmallow/android-6.0-changes.html