[英]Android - Read build.gradle properties inside class
我希望可以访问build.gradle属性,以便可以自动执行我的应用程序中的某些流程。
这是我目前的结构:
rootProject / build.gradle
buildscript {
ext {
buildTools = "25.0.2"
minSdk = 16
compileSdk = 23
targetSdk = 23
versions = [supportLib : '25.0.0',
multidex : '1.0.1',
playServices : '10.0.1']
libs = [appcompat : "com.android.support:appcompat-v7:$versions.supportLib",
design : "com.android.support:design:$versions.supportLib"]
.... Other libraries and setup....
}
}
rootProject / app / build.gradle
...
dependencies {
// Support libraries
compile libs.appcompat
compile libs.design
.....
}
我想同时在Java和build.gradle上访问属性版本和libs变量。 我该如何实现?
使用gradle.properties文件仅在一个位置定义值,然后可以在gradle项目配置中使用此值。
然后,要能够在Java android代码中访问这些值,请使用“ buildConfigField”定义。
gradle.properties
values=value1,value2
build.gradle
def String[] valuesArray = values.split(',')
android {
defaultConfig {
buildConfigField "String[]", "VALUES_ARRAY", "{" +
"\"" + valuesArray[0] + "\"," +
"\"" + valuesArray[1] + "\"" +
"}"
}
}
在java文件中
BuildConfig.VALUES_ARRAY
您可以执行类似操作,但是在buildscript
块之外
ext {
// Version
supportVersion = '26.0.0'
// Support Libraries dependencies
supportDependencies = [
design: "com.android.support:design:${supportVersion}",
recyclerView: "com.android.support:recyclerview-v7:${supportVersion}",
cardView: "com.android.support:cardview-v7:${supportVersion}",
appCompat: "com.android.support:appcompat-v7:${supportVersion}",
supportAnnotation: "com.android.support:support-annotations:${supportVersion}",
]
firebaseVersion = '11.0.2';
firebaseDependencies = [
core: "com.google.firebase:firebase-core:${firebaseVersion}",
database: "com.google.firebase:firebase-database:${firebaseVersion}",
storage: "com.google.firebase:firebase-storage:${firebaseVersion}",
crash: "com.google.firebase:firebase-crash:${firebaseVersion}",
auth: "com.google.firebase:firebase-auth:${firebaseVersion}",
messaging: "com.google.firebase:firebase-messaging:${firebaseVersion}",
remoteConfig: "com.google.firebase:firebase-config:${firebaseVersion}",
invites: "com.google.firebase:firebase-invites:${firebaseVersion}",
adMod: "com.google.firebase:firebase-ads:${firebaseVersion}",
appIndexing: "com.google.android.gms:play-services-appindexing:${firebaseVersion}",
];
}
// Module build file
dependencies {
// ...
compile supportDependencies.appCompat
compile supportDependencies.design
compile firebaseDependencies.crash
}
在Java中,您无法访问build.gradle
文件,因为它们仅在构建时使用。 但是,您可以将相同的值放在BuildConfig
文件中。 在此文件中,有一些预先构建的值,例如BuildConfig.VERSION_NAME
或者您可以使用一些自定义键,例如:
android {
...
defaultConfig {
...
// defining the build date
buildConfigField "long", "BUILD_DATE", System.currentTimeMillis() + "L"
// define whether this build is a production build
buildConfigField "boolean", "IS_PRODUCTION", "false"
// note that to define a string you need to escape it
buildConfigField "String", "API_KEY", "\"my_api_key\""
}
}
自动生成的<package_name>.BuildConfig.java
将基于上述指令包含以下字段:
public class BuildConfig {
// ... other generated fields ...
public static final long BUILD_DATE = 1469504547000L;
public static final boolean IS_PRODUCTION = false;
public static final String API_KEY = "my_api_key";
}
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