Question

我正在尝试在我的Android应用中使用SOAP服务。我正在尝试遵循this guide。当我尝试运行我的应用程序时，出现错误：

Error: MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26)

我使用的是Android N（SDK 25-我无法像错误消息所示那样升至26），这是一个由Android Studio创建的全新项目。

这是我尚未更改的项目build.gradle文件：

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.4.1'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

这是我的应用程序build.gradle文件：

apply plugin: 'com.android.application'

configurations {
    jaxb
}

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:2.1.6.RELEASE")
    }
}

apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'

repositories {
    mavenCentral()
}

// tag::wsdl[]
task genJaxb {
    ext.sourcesDir = "${buildDir}/generatedjava/jaxb"
    ext.classesDir = "${buildDir}/classes/jaxb"
    ext.schema = "https://lite.realtime.nationalrail.co.uk/OpenLDBWS/wsdl.aspx?ver=2017-10-01"

    outputs.dir classesDir

    doLast() {
        project.ant {
            taskdef name: "xjc", classname: "com.sun.tools.xjc.XJCTask",
                    classpath: configurations.jaxb.asPath
            mkdir(dir: sourcesDir)
            mkdir(dir: classesDir)

            xjc(destdir: sourcesDir, schema: schema,
                    package: "hello.wsdl") {
                arg(value: "-wsdl")
                produces(dir: sourcesDir, includes: "**/*.java")
            }

            javac(destdir: classesDir, source: 1.8, target: 1.8, debug: true,
                    debugLevel: "lines,vars,source",
                    classpath: configurations.jaxb.asPath) {
                src(path: sourcesDir)
                include(name: "**/*.java")
                include(name: "*.java")
            }

            copy(todir: classesDir) {
                fileset(dir: sourcesDir, erroronmissingdir: false) {
                    exclude(name: "**/*.java")
                }
            }
        }
    }
}
// end::wsdl[]

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.0"
    defaultConfig {
        applicationId "com.example.magicmirror"
        minSdkVersion 25
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    packagingOptions {
        exclude 'META-INF/spring.tooling'
        exclude 'META-INF/spring.handlers'
        exclude 'META-INF/spring-configuration-metadata.json'
        exclude 'META-INF/additional-spring-configuration-metadata.json'
        exclude 'META-INF/spring.factories'
        exclude 'META-INF/spring.schemas'
        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'
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

    implementation "org.springframework.boot:spring-boot-starter"
    implementation "org.springframework.ws:spring-ws-core"
    implementation(files(genJaxb.classesDir).builtBy(genJaxb))

    jaxb "com.sun.xml.bind:jaxb-xjc:2.1.7"
}

在日志中，导致此错误的确切JAR为org.springframework/spring-core/5.1.8.RELEASE.jar。其他答案中提到了添加compileOptions块作为解决方法，但尚未解决此问题。我该如何解决？

Answer 1

您尝试过ksoap吗？

https://github.com/simpligility/ksoap2-android

看起来它应该做肥皂，还活着，并且适用于Android。

ksoap2-android项目提供了轻便高效的SOAP Android平台的客户端库。

Answer 2

我认为您只需要使用其他库即可进行SOAP调用。这就是我使用过的支持SDK版本早于14的版本。

private void GetSomeStuff(String myterm) throws UnsupportedEncodingException {


try {

     String strStuff2 = "<?xml version=\"1.0\" encoding=\"utf-8\"?>"+
     "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"+
     "<soap:Header><wsse:Security xmlns:wsse=\"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd\">"+
     "<wsse:UsernameToken><wsse:Username>my username</wsse:Username><wsse:Password Type=\"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText\">my password</wsse:Password></wsse:UsernameToken></wsse:Security></soap:Header>"+
     "<soap:Body> <GetSomeStuff xmlns=\"https://mycompany.com.MyService\">"+
     "<term>" + myterm + "/term></GetSomeStuff></soap:Body></soap:Envelope>";


    StringBuilder stringBuilder = new StringBuilder();


    HttpPost httppost = new HttpPost("https://mycompany.com/MyService.svc");        
    StringEntity se;

    se = new StringEntity(strStuff2,HTTP.UTF_8);


    httppost.setHeader("SOAPAction", "https://mycompany.com.MyService/GetSomeStuff”);


    se.setContentType("text/xml");  
    httppost.setEntity(se);  


    HttpClient httpclient = new DefaultHttpClient();      

    HttpResponse theresponse = (HttpResponse) httpclient.execute(httppost);

    StatusLine statusLine = theresponse.getStatusLine();
    int statusCode = statusLine.getStatusCode();
    if (statusCode == 200) {
        HttpEntity entity = theresponse.getEntity();
        InputStream content = entity.getContent();
        BufferedReader reader = new BufferedReader(
                new InputStreamReader(content));
        String line;
        while ((line = reader.readLine()) != null) {
            stringBuilder.append(line);
        }

        String theXML = stringBuilder.toString();

        int start = theXML.indexOf("<GetSomeStuffResult>") + 21;
        int end = theXML.indexOf("</GetSomeStuffResult>") - 1;

        // We didn't get the response we expected
        if ((start < 0) || (end < 0) || (start==end)) {
            Log.i(“MyApp”,”Empty Response from GetSomeStuffResult");
            return;
        }

        String myData = theXML.substring(start, end);

        if (myData() > 0) {
            try {
                JSONObject jObject = new JSONObject(myData);

                String deptDesc = jObject.getString("DepartmentDescription");
                String areaCode = jObject.getString("area_code");
                String phoneNumber = jObject.getString("phone_nbr");
                String title = jObject.getString("title");

                String fullPhoneNumber = "";

                if (phoneNumber.length() == 7) {
                    fullPhoneNumber = "(" + areaCode + ") " + phoneNumber.substring(0, 3) + "-" + phoneNumber.substring(3, 7);
                } else {
                     fullPhoneNumber = "(" + areaCode + ") " + phoneNumber;
                }

                SharedPreferences appPrefs =
                        getSharedPreferences("appPreferences",MODE_PRIVATE);

                SharedPreferences.Editor prefsEditor = appPrefs.edit();
                prefsEditor.putString("Title",title);
                prefsEditor.putString("DeptDescr",deptDesc);
                prefsEditor.putString("PhoneNumber",fullPhoneNumber);

                prefsEditor.commit();   

            }
            catch (JSONException e) {
                e.printStackTrace();
            }
        }


    } else {
         Log.e(“MyApp”, "Failed to GetSomeStuff”);
    }


} catch (ClientProtocolException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
} catch (Exception e) {
    e.printStackTrace();
}

Answer 3

org.springframework/spring-core/5.1.8.RELEASE.jar无法与minSdkVersion 25一起使用，它甚至不是Android库，而是Java库。它严格要求minSdkVersion 26：

MethodHandle.invoke and MethodHandle.invokeExact
are only supported starting with Android O (--min-api 26)

ksoap2-android可能确实更兼容（最常见）或
wsdl2ksoap2-android，带有设备上的“从WSDL生成自动源代码”。

...还有其他一些链接；有些需要在Desktop Java上生成POJO。

Gradle Android错误：MethodHandle.invoke和MethodHandle.invokeExact

3 个答案: