blocks|key|295178|text|下面是两种将值从Gradle传递到Java中的方法；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|295179|生成Java常量|295180|android+{
++++buildTypes+{
++++++++debug+{
++++++++++++buildConfigField+"int",+"FOO",+"42"
++++++++++++buildConfigField+"String",+"FOO_STRING",+"\"foo\""
++++++++++++buildConfigField+"boolean",+"LOG",+"true"
++++++++}

++++++++release+{
++++++++++++buildConfigField+"int",+"FOO",+"52"
++++++++++++buildConfigField+"String",+"FOO_STRING",+"\"bar\""
++++++++++++buildConfigField+"boolean",+"LOG",+"false"
++++++++}
++++}
}|code-block|syntax|javascript|295181|您可以使用BuildConfig.FOO访问它们|offset|length|style|CODE|295182|生成Android资源|295183|android+{
++++buildTypes+{
++++++++debug{
++++++++++++resValue+"string",+"app_name",+"My+App+Name+Debug"
++++++++}
++++++++release+{
++++++++++++resValue+"string",+"app_name",+"My+App+Name"
++++++++}
++++}
}|295184|您可以使用@string/app_name或R.string.app_name以常规方式访问它们|295185|entityMap^0|0|0|0|5|F|0|0|0|5|G|M|H|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@$K|10|L|11|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|F|7|13|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|14|8|@$K|15|L|16|M|N]|$K|17|L|18|M|N]]|9|@]|A|$]]|$1|U|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|V|$]]

Here are two ways to pass value from Gradle to use in Java;
<h2>Generate Java Constants</h2>
<pre><code>android {
 buildTypes {
 debug {
 buildConfigField &quot;int&quot;, &quot;FOO&quot;, &quot;42&quot;
 buildConfigField &quot;String&quot;, &quot;FOO_STRING&quot;, &quot;\&quot;foo\&quot;&quot;
 buildConfigField &quot;boolean&quot;, &quot;LOG&quot;, &quot;true&quot;
 }

 release {
 buildConfigField &quot;int&quot;, &quot;FOO&quot;, &quot;52&quot;
 buildConfigField &quot;String&quot;, &quot;FOO_STRING&quot;, &quot;\&quot;bar\&quot;&quot;
 buildConfigField &quot;boolean&quot;, &quot;LOG&quot;, &quot;false&quot;
 }
 }
}
</code></pre>
You can access them with <code>BuildConfig.FOO</code>
<h2>Generate Android resources</h2>
<pre><code>android {
 buildTypes {
 debug{
 resValue &quot;string&quot;, &quot;app_name&quot;, &quot;My App Name Debug&quot;
 }
 release {
 resValue &quot;string&quot;, &quot;app_name&quot;, &quot;My App Name&quot;
 }
 }
}
</code></pre>
You can access them in the usual way with <code>@string/app_name</code> or <code>R.string.app_name</code>

blocks|key|78110|text|rciovati的答案是完全正确的，我只想再添加一个花边新闻，您还可以在build.gradle的默认配置部分中为每个构建类型创建变量。这看起来像这样：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|78111|android+{
++++defaultConfig+{
++++++++buildConfigField+"String",+"APP_NAME",+"\"APP_NAME\""
++++}
}|code-block|syntax|javascript|78112|这将允许您通过访问|78113|BuildConfig.App_NAME|78114|如果你想要一个通用的配置，我只想记录下这个场景。|78115|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

rciovati's answer is entirely correct I just wanted to add one more tidbit that you can also create variables for every build type within the default config portion of your build.gradle. This would look like this:

<pre><code>android {
 defaultConfig {
 buildConfigField "String", "APP_NAME", "\"APP_NAME\""
 }
}
</code></pre>

This will allow you to have access to through

<pre><code>BuildConfig.App_NAME
</code></pre>

Just wanted to make a note of this scenario as well if you want a common config.

blocks|key|78139|text|我正在使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|78140|buildTypes.each+{
++++it.buildConfigField+'String',+'GoogleMapsApiKey',+"\"$System.env.GoogleMapsApiKey\""
}|code-block|syntax|javascript|78141|它基于Dennis's+answer，但从一个环境变量获取它。|offset|length|78142|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/35650390^0|0|0|3|F|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I'm using

<pre><code>buildTypes.each {
 it.buildConfigField 'String', 'GoogleMapsApiKey', "\"$System.env.GoogleMapsApiKey\""
}
</code></pre>

Its based on <a href="https://stackoverflow.com/a/35650390">Dennis's answer</a> but grabs its from an environment variable.

blocks|key|78157|text|我正在使用这段代码，并且工作得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|78158|def+baseUrl+=+'\"http://patelwala.com/myapi/"'
def+googleServerKey+=+'\"87171841097-opu71rk2ps35ibv96ud57g3ktto6ioio.apps.googleusercontent.com"'
android+{
++buildTypes+{
++release+{
++++++++minifyEnabled+true
++++++++proguardFiles+getDefaultProguardFile('proguard-android.txt'),+'proguard-rules.pro'
++++++++buildConfigField+'String',+'BASE_URL',+baseUrl
++++++++buildConfigField+'String',+'web_client_id',+googleServerKey
++++}
++++releasedebug+{
++++++++initWith+debug
++++++++buildConfigField+'String',+'BASE_URL',+baseUrl
++++++++buildConfigField+'String',+'web_client_id'+,googleServerKey
++++}
++++debug+{

++++++++buildConfigField+'String',+'BASE_URL',+baseUrl
++++++++buildConfigField+'String',+'web_client_id',+googleServerKey
++++}
+}
}|code-block|syntax|javascript|78159|}|78160|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I'm using this code and working very fine.

<pre><code>def baseUrl = '\"http://patelwala.com/myapi/"'
def googleServerKey = '\"87171841097-opu71rk2ps35ibv96ud57g3ktto6ioio.apps.googleusercontent.com"'
android {
 buildTypes {
 release {
 minifyEnabled true
 proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
 buildConfigField 'String', 'BASE_URL', baseUrl
 buildConfigField 'String', 'web_client_id', googleServerKey
 }
 releasedebug {
 initWith debug
 buildConfigField 'String', 'BASE_URL', baseUrl
 buildConfigField 'String', 'web_client_id' ,googleServerKey
 }
 debug {

 buildConfigField 'String', 'BASE_URL', baseUrl
 buildConfigField 'String', 'web_client_id', googleServerKey
 }
 }
}
</code></pre>

}

blocks|key|78182|text|如何将函数的字符串结果插入到buildConfigField中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|78183|以下是以人类可读格式设置构建日期的示例：|78184|def+getDate()+{
++++return+new+SimpleDateFormat("dd+MMMM+yyyy",+new+Locale("ru")).format(new+Date())
}

def+buildDate+=+getDate()

defaultConfig+{
++++buildConfigField+"String",+"BUILD_DATE",+"\"$buildDate\""
}|code-block|syntax|javascript|78185|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

How can you insert String result of function into buildConfigField

Here's an example of build date in human-readable format set:

<pre><code>def getDate() {
 return new SimpleDateFormat("dd MMMM yyyy", new Locale("ru")).format(new Date())
}

def buildDate = getDate()

defaultConfig {
 buildConfigField "String", "BUILD_DATE", "\"$buildDate\""
}
</code></pre>

blocks|key|295360|text|上面的答案都没有给我任何指导，所以我不得不花两个小时学习Groovy方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|295361|我希望能够对抗生产环境、沙箱环境和本地环境。因为我很懒，所以我只想在一个地方更改URL。这是我想出来的：|295362|+flavorDimensions+'environment'
++++productFlavors+{
++++++++production+{
++++++++++++def+SERVER_HOST+=+"evil-company.com"
++++++++++++buildConfigField+'String',+'API_HOST',+"\"${SERVER_HOST}\""
++++++++++++buildConfigField+'String',+'API_URL',+"\"https://${SERVER_HOST}/api/v1/\""
++++++++++++buildConfigField+'String',+'WEB_URL',+"\"https://${SERVER_HOST}/\""
++++++++++++dimension+'environment'
++++++++}
++++++++rickard+{
++++++++++++def+LOCAL_HOST+=+"192.168.1.107"
++++++++++++buildConfigField+'String',+'API_HOST',+"\"${LOCAL_HOST}\""
++++++++++++buildConfigField+'String',+'API_URL',+"\"https://${LOCAL_HOST}/api/v1/\""
++++++++++++buildConfigField+'String',+'WEB_URL',+"\"https://${LOCAL_HOST}/\""
++++++++++++applicationIdSuffix+".dev"
++++++++}
++++}|code-block|syntax|javascript|295363|另一种语法，因为在Groovy方法中只能使用带双引号的${variable}。|offset|length|style|CODE|295364|++++rickard+{
++++++++def+LOCAL_HOST+=+"192.168.1.107"
++++++++buildConfigField+'String',+'API_HOST',+'"'+%2B+LOCAL_HOST+%2B+'"'
++++++++buildConfigField+'String',+'API_URL',+'"https://'+%2B+LOCAL_HOST+%2B+'/api/v1/"'
++++++++buildConfigField+'String',+'WEB_URL',+'"https://'+%2B+LOCAL_HOST+%2B+'"'
++++++++applicationIdSuffix+".dev"
++++}|295365|我很难理解的是，字符串需要声明为用引号括起来的字符串。由于这个限制，我不能直接使用引用API_HOST，这是我首先想做的。|295366|entityMap^0|0|0|0|R|B|0|0|17|8|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@$K|Y|L|Z|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|11|8|@$K|12|L|13|M|N]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

None of the above answers gave me any guidelines so I had to spend two hours learning about Groovy Methods.

I wanted be able to go against a production, sandbox and local environment. Because I'm lazy, I only wanted to change the URL at one place. Here is what I came up with:

<pre><code> flavorDimensions 'environment'
 productFlavors {
 production {
 def SERVER_HOST = "evil-company.com"
 buildConfigField 'String', 'API_HOST', "\"${SERVER_HOST}\""
 buildConfigField 'String', 'API_URL', "\"https://${SERVER_HOST}/api/v1/\""
 buildConfigField 'String', 'WEB_URL', "\"https://${SERVER_HOST}/\""
 dimension 'environment'
 }
 rickard {
 def LOCAL_HOST = "192.168.1.107"
 buildConfigField 'String', 'API_HOST', "\"${LOCAL_HOST}\""
 buildConfigField 'String', 'API_URL', "\"https://${LOCAL_HOST}/api/v1/\""
 buildConfigField 'String', 'WEB_URL', "\"https://${LOCAL_HOST}/\""
 applicationIdSuffix ".dev"
 }
 }
</code></pre>

Alternative syntax, because you can only use <code>${variable}</code> with double quotes in Groovy Methods.

<pre><code> rickard {
 def LOCAL_HOST = "192.168.1.107"
 buildConfigField 'String', 'API_HOST', '"' + LOCAL_HOST + '"'
 buildConfigField 'String', 'API_URL', '"https://' + LOCAL_HOST + '/api/v1/"'
 buildConfigField 'String', 'WEB_URL', '"https://' + LOCAL_HOST + '"'
 applicationIdSuffix ".dev"
 }
</code></pre>

What was hard for me to grasp was that strings needs to be declared as strings surrounded by quotes. Because of that restriction, I couldn't use reference <code>API_HOST</code> directly, which was what I wanted to do in the first place.

blocks|key|78278|text|这适用于在Java和Kotlin中都可用的Kotlin+DSL+(build.gradle.kts)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|78279|buildTypes+{
++++getByName("debug")+{
++++++++buildConfigField("Boolean",+"isHappy",+"true")
++++++++buildConfigField("String",+"favoriteSong",+""""Black+Forest"""")
++++++++resValue("string",+"myName",+"Lind")
++++}
}|code-block|syntax|javascript|78280|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is for Kotlin DSL (build.gradle.kts) usable both in Java and Kotlin:
<pre class="lang-kotlin prettyprint-override"><code>buildTypes {
 getByName(&quot;debug&quot;) {
 buildConfigField(&quot;Boolean&quot;, &quot;isHappy&quot;, &quot;true&quot;)
 buildConfigField(&quot;String&quot;, &quot;favoriteSong&quot;, &quot;&quot;&quot;&quot;Black Forest&quot;&quot;&quot;&quot;)
 resValue(&quot;string&quot;, &quot;myName&quot;, &quot;Lind&quot;)
 }
}
</code></pre>

Is it possible to declare a variable in Gradle usable in Java ?
Basically I would like to declare some vars in the build.gradle and then getting it (obviously) at build time. Just like a pre-processor macros in C/C++...

An example of declaration would be something like that ... :

<pre><code>android {
 debug {
 A_VAR_RETRIEVABLE_IN_JAVA = 42
 }
 release {
 A_VAR_RETRIEVABLE_IN_JAVA = 42+52
 }
}
</code></pre>

Is there a way to do something like that ?

Is it possible to declare a variable in Gradle usable in Java?

Android

Kotlin

Java

在Gradle中声明变量是否可以在Java中使用？基本上，我想在build.gradle中声明一些var，然后(显然)在构建时获取它。就像C/C++中的预处理器宏一样...声明的示例如下所示：android {    debug {        A_VAR_RETRIEVABLE_IN_JAVA = 42    } ...

问在Gradle中声明变量是否可以在Java中使用？
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