[Android ERROR&SOLVE]org.apache.http does not exist

이유

- 안드로이드 6.0 버전으로 오면서 Apache http를 지원하지 않음

https://developer.android.com/intl/ko/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'
}

해결방법

1. /build.gradle파일에 gradle버전 업데이트

buildscript {
    ...
    dependencies {
        classpath 'com.android.tools.build:gradle:1.3.1'
       
    }
}

2. /app/build.gradle 파일 수정

android {
    compileSdkVersion 23
    buildToolsVersion '23.0.1'


    // 6.0으로 바뀌면서 apache 없어짐
    useLibrary 'org.apache.http.legacy'
    ...
}