How to replace strings resources with Android Gradle

Question

I made a new app with gradle in Android Studio, and now I need to make about 10 versions with different package names and values in resources. I made custom flavors as in example and want to replace some strings in this custom flavors with custom values. I found example like this: ``` filter(org.apache.tools.ant.filters.ReplaceTokens, tokens: ['version': '2.2']) ``` But i don't know where to put it. As i understand i need to put it into separate task, but how to make this task called by IDE? Also i need to replace few variables inside Java classes and Content Provider's auth, maybe i need to do this by copy files into flavor1 folder and let gradle to merge it, but it seems like wrong solution to store many copies of files with difference in one line... Maybe i need to user some other solution for all this? Here is build.gradle: ``` buildscript { repositories { mavenCentral() } dependencies { classpath 'com.android.tools.build:gradle:0.4.2' } } apply plugin: 'android' dependencies { co…

Accepted Answer

I had a similar problem. I wanted to add the Jenkins build number to the strings that get merged from strings.xml. Here's my solution as of Android Gradle plugin 0.12.+.

```
// Insert the build number into strings.xml
android.applicationVariants.all{ variant ->
    variant.mergeResources.doLast{
        ext.env = System.getenv()
        def buildNumber = env.BUILD_NUMBER
        if (buildNumber != null) {
            File valuesFile = file("${buildDir}/intermediates/res/${variant.dirName}/values/values.xml")
            println("Replacing revision number in " + valuesFile)
            println("Build number = " + buildNumber)
            String content = valuesFile.getText('UTF-8')
            content = content.replaceAll(/devBuild/, buildNumber)
            valuesFile.write(content, 'UTF-8')
        }
    }
}
```

You might want to hook into a different Gradle task depending on what you want to do. Take a look at the tasks that are part of the Android build to figure that out.

http://tools.android.com/tech-docs/new-build-system/user-guide

UPDATE: At some point, the Android Gradle plugin changed the way to iterate through application variants keyword from each to all. My answer has been updated to reflect the change, but try switching to each if this code doesn't print anything to the console.

How to replace strings resources with Android Gradle

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