问题H1

使用spring-android-auth时，其使用的RestTemplate是依赖包spring-android-rest-template中的，而是spring-web-mvc中的。该RestTemplate使用http request默认的逻辑如下

bash
private static final boolean HTTP_COMPONENTS_AVAILABLE = ClassUtils.isPresent("org.apache.http.client.HttpClient", ClientHttpRequestFactory.class.getClassLoader());

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
    this.requestFactory = new SimpleClientHttpRequestFactory();
} else {
    this.requestFactory = new HttpComponentsClientHttpRequestFactory();
}

使用spring-android-auth的主要目的是使用其依赖的spring-social，其中的OAuth1Template,OAuth2Template等使用的RestTempalte中使用的http request是ClientHttpRequestFactory。

bash
public static ClientHttpRequestFactory getRequestFactory() {
    Properties properties = System.getProperties();
    String proxyHost = properties.getProperty("http.proxyHost");
    int proxyPort = properties.containsKey("http.proxyPort") ? Integer.valueOf(properties.getProperty("http.proxyPort")) : 80;
    if (HTTP_COMPONENTS_AVAILABLE) {
        return HttpComponentsClientRequestFactoryCreator.createRequestFactory(proxyHost, proxyPort);
    } else {
        SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
        if (proxyHost != null) {
            requestFactory.setProxy(new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort)));
        }
        return requestFactory;
    }
}

由于Android SDK中带有HttpClient这个类的，但是又不包含创建的实例对象CloseableHttpClient，实际会报错ClassNotFound。

解决H1

spring-android的构建脚本中对于spring-android-rest-template模块的依赖

bash
project("spring-android-rest-template") {
    description = "Spring for Android Rest Template"

    ext.mavenTestDir = "../test/spring-android-rest-template-test/pom.xml"

    dependencies {
        provided("com.google.android:android:$androidVersion")
        compile(project(":spring-android-core"))
        optional("org.apache.httpcomponents:httpclient-android:$httpclientVersion")
        optional("com.squareup.okhttp:okhttp-urlconnection:$okHttpVersion")
        optional("org.codehaus.jackson:jackson-mapper-asl:$jacksonVersion")
        optional("com.fasterxml.jackson.core:jackson-databind:$jackson2Version")
        optional("com.google.code.gson:gson:$gsonVersion")
        optional("org.simpleframework:simple-xml:$simpleXmlVersion") { dep ->
            transitive = false
        }
    }
}

httpclient-android是一个optional的依赖，所以使用HttpClient需要显示的指定依赖。

bash
compile group: 'org.apache.httpcomponents', name: 'httpclient-android', version:'4.3.3'

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