How to write build time stamp into apk

Question

1. Making some changes in Android Contacts package
2. Using mm (make) command to build this application

Because I have to change and

Answer 1

in your build.gradle:

android {
    defaultConfig {
        buildConfigField 'String', 'BUILD_TIME', 'new java.text.SimpleDateFormat("MM.dd.yy HH:mm", java.util.Locale.getDefault()).format(new java.util.Date(' + System.currentTimeMillis() +'L))'
    }
}