Android/HttpRequest通信/DefaultHttpClient/legacy

Caused by: java.lang.NoClassDefFoundError: Failed resolution of: Lorg/apache/http/client/methods/HttpGet;エラーが出る場合

以下追加 app/build.gradle

dependencies {
    implementation group: 'org.apache.httpcomponents', name: 'httpclient', version: '4.5.1'
}

参考：https://stackoverflow.com/questions/41655015/java-and-httpclient-java-lang-noclassdeffounderror

file was found with OS independent path 'META-INF/DEPENDENCIES'エラーとなる場合は

以下追加 app/build.gradle

android {
    packagingOptions {
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/ASL2.0'
    }
}

httpclient defines classes that conflict with classes now provided by Android.エラーとなる場合は

以下追加 app/build.gradle

configurations {
   all {
       exclude module: 'httpclient'
   }
}