Kivy/Buildozer Android: Change theme in manifest during build

readme.md

This automatically changes the default theme in the android_manifest.xml to the theme specified in the var "NEW_THEME" using p4a.hooks

The example I used is here https://gist.github.com/tito/4f75385054222182e4f0cf56c90dcdf8 with further instructions in how to implement it.

This hook_theme.py file is the 'hook_something.py' mentioned in Tito's example.

It should be noted that the appropriate gradle dependency for you're chosen theme will need added to the buildozer.spec

mine in this case is android.gradle_dependencies = 'com.android.support:appcompat-v7:26.0.0-alpha1'

hook_theme.py

import re
from pythonforandroid.logger import info

"""
HOOK for Android Theme
"""

NEW_THEME = "@style/Theme.AppCompat.Light"


def after_apk_build(toolchain):
    # mutate AndroidManifest.xml
    manifest_fn = "{}/src/main/AndroidManifest.xml".format(
        toolchain._dist.dist_dir)
    with open(manifest_fn, "r") as fd:
        manifest = fd.read()

    OLD_THEME = str(re.search(r'android:theme="(.*?)"', manifest).group(1))

    # check if new theme is already active
    if NEW_THEME != OLD_THEME:
        # changing to new theme
        info("CHANGIN THEME: replacing: {} with {}".format(OLD_THEME, NEW_THEME))
        manifest = manifest.replace(OLD_THEME, NEW_THEME)
        # saving changes
        with open(manifest_fn, "w") as fd:
            fd.write(manifest)

    else:
        info(NEW_THEME + "already in manifest")