How to change Android App Name and ID of an existing application?

Question

I have two Android projects in Eclipse. I copied the one project from the other, then changed the app name (in strings.xml) and the project name

Answer 1

The most simple way I have found to accomplish this task is to utilize Product Flavor in .gradle

productFlavors {
    MainApp {
        applicationId = "com.company.app"
    }
    NewAppFlavor {
        applicationId = "com.company.newapp"
    }
}

buildTypes {
    debug {
        buildConfigField "java.util.Date", "buildTime", "new java.util.Date(" +  getDateAsMillis() + "L)"
        applicationIdSuffix ".debug"
    }
}

You then specify package name in AndroidManifest.xml as

Upon release configuration, Android Studio (1.5.1 as of this writing) will ask which flavor to build.

Debug configuration is a little less intuitive, you must hover the cursor over the bottom left corner of the screen, select "Build Variants" and select which flavor your debug configuration will deploy when you press the play button.