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

Method which checks date of last modification of classes.dex, this means last time when your app's code was built:

  try{
     ApplicationInfo ai = getPackageManager().getApplicationInfo(getPackageName(), 0);
     ZipFile zf = new ZipFile(ai.sourceDir);
     ZipEntry ze = zf.getEntry("classes.dex");
     long time = ze.getTime();
     String s = SimpleDateFormat.getInstance().format(new java.util.Date(time));
     zf.close();
  }catch(Exception e){
  }

Tested, and works fine, even if app is installed on SD card.