java - Gradle - 找不到依赖项 Android Studio

Question

我已经在 gradle 文件中添加了依赖项，但仍然无法识别 jar 文件的类。

android {
    compileSdkVersion 19
    buildToolsVersion "21.1.2"

    defaultConfig {
        applicationId "com.devstring.imageframe"
        minSdkVersion 14
        targetSdkVersion 14
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
}

dependencies {
    compile 'com.android.support:support-v4:18.0.0'

//    compile files('D:/EKCS-data/EDCloud/e.d.cloud/libs/activation.jar')
//    compile files('D:/EKCS-data/EDCloud/e.d.cloud/libs/activation.jar/additionnal.jar')
//    compile files('D:/EKCS-data/EDCloud/e.d.cloud/libs/activation.jar/mail.jar')
    compile fileTree(dir: 'libs', include: '*.jar')
}

我收到错误 - 无法在此处解析类

import javax.activation.DataHandler;
import javax.activation.DataSource;

    import javax.mail.Message;
    import javax.mail.PasswordAuthentication;
    import javax.mail.Session;
    import javax.mail.Transport;
    import javax.mail.internet.InternetAddress;
    import javax.mail.internet.MimeMessage;

我已经提到了以下内容

Android Studio missing external dependencies

Android Studio stuck on "Gradle: resolve dependancies '_debugCompile'" or 'detachedConfiguration1'

How to add local .jar file dependency to build.gradle file?

Android Studio stuck on gradle resolving dependencies

gradle - not able to find dependencies from maven repo

Gradle cannot resolve dependencies in Android Studio

编辑

我也尝试从 gradle 命令行构建。

我也用gradle文件同步项目

请帮忙!

谢谢

Answer 1

我认为您缺少 []，我是这样使用它的:

compile fileTree(dir: 'libs', include: ['*.jar'])

如果这不起作用，你可以尝试使用来自 maven central 的那些:

compile 'javax.mail:mail:1.4.7'

这是最新的稳定版本，有测试版，或者从http://mvnrepository.com/artifact/javax.mail/mail中选择一个旧版本