如何在Android Studio项目中添加Gradle构建库?

Question

我想将以下库添加到我的项目的Gradle构建中。我要添加的库是:我已经下载的signal-protocol-java-2.8.1.jar。我如何将它添加到Gradle构建中，以便将.jar中包含的类导入到我正在开发的java类中?

这是我的build.gradle文件:

buildscript {
repositories {
google()
mavenCentral()
jcenter {
content {
includeVersion 'org.jetbrains.trove4j', 'trove4j', '20160824'
includeGroupByRegex "com\.archinamon.*"
}
}
}
dependencies {
classpath 'com.android.tools.build:gradle:4.0.1'
classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.14'
classpath "android.arch.navigation:navigation-safe-args-gradle-plugin:1.0.0-alpha09"
}
}

ext {
BUILD_TOOL_VERSION = '30.0.2'
COMPILE_SDK = 30
TARGET_SDK  = 30
MINIMUM_SDK = 19
JAVA_VERSION = JavaVersion.VERSION_1_8
}
wrapper {
distributionType = Wrapper.DistributionType.ALL
}
allprojects {
repositories {
google()
jcenter()
}
}
subprojects {
ext.lib_signal_service_version_number   = "2.15.3"
ext.lib_signal_service_group_info       = "org.whispersystems"
ext.lib_signal_metadata_version         = "0.1.2"
if (JavaVersion.current().isJava8Compatible()) {
allprojects {
tasks.withType(Javadoc) {
options.addStringOption('Xdoclint:none', '-quiet')
}
}
}
}
task qa {
group 'Verification'
description 'Quality Assurance. Run before pushing.'
dependsOn ':Signal-Android:testPlayProdReleaseUnitTest',
':Signal-Android:lintPlayProdRelease',
':libsignal-service:test',
':Signal-Android:assemblePlayProdDebug'
}

Answer 1

你必须编辑你的模块级build.gradle(你发布的是项目级)。它通常在"应用程序"中项目文件夹。找到dependencies块并添加以下行:

dependencies {
implementation fileTree(dir: "libs", include: ["*.jar"])
...
}

然后创建一个文件夹"lib "靠近这个gradle文件，把你的.jar库放在那里。用Gradle同步项目