How to pass System.property to Android App from Gradle?

Question

I want to be able to get system property from the application as:

String isTesting = System.getProperty("IS_TESTING");

I have tried to pass the argument using -D flag in gradle, like ./gradlew assemble -DIS_TESTING. Or doing so:

task setCustomProp << {
    System.setProperty("IS_TESTING", "true")
}

preBuild.dependsOn setCustomProp

Even tried to change the gradle.properties adding this line:

org.gradle.jvmargs=-DIS_TESTING=true

But, none of those attempts results on getting the value on the application code. I'm simply trying to get like:

@Override
  public void onCreate() {
    super.onCreate();
    String isTesting = System.getProperty("IS_TESTING");
}

Answer 1

Why don't you just add:

buildConfigField "boolean", "IS_TESTING", "true" 

to build.gradle.

and then in your:

@Override
  public void onCreate() {
    super.onCreate();
    boolean isTesting = BuildConfig.IS_TESTING
}