Provide an Android version code derived from the Emacs version

The version code is intended to be an integer that increments
for each Android package release
(https://developer.android.com/studio/publish/versioning#versioningsettings).

If we keep this updated under version control, then F-Droid (a
third-party Android package repository), can watch for that, and
use it to automatically build Emacs packages for Android each
time a new Emacs release is tagged
(https://f-droid.org/en/docs/Build_Metadata_Reference/#UpdateCheckData).

* admin/admin.el (set-version): Update version code in
java/incrementing-version-code
* java/incrementing-version-code: New file containing an Android
version code corresponding to the current Emacs version.
(bug#75809)

1 files changed, 12 insertions, 0 deletions

diff --git a/java/incrementing-version-code b/java/incrementing-version-code
new file mode 100644
index 00000000000..fed5b627275
--- /dev/null
+++ b/java/incrementing-version-code
@@ -0,0 +1,12 @@
+; This file contains an Android version code
+; (https://developer.android.com/studio/publish/versioning#versioningsettings)
+; corresponding to the current Emacs version.
+;
+; The version code in AndroidManifest.xml.in is hard-coded to a fixed
+; value, to make package downgrades possible.  Where an incrementing
+; version code is required (for example, for automated F-Droid package
+; builds (https://f-droid.org/packages/org.gnu.emacs/)), the version
+; code in this file should be referred to and patched in to
+; AndroidManifest.xml.
+
+300093000