Kivy-part for native UI

setup

set the correct p4a directory (depends on your p4a location):

p4a.source_dir = /home/phil/p4a
set package and app name
add source.include_patterns = res/* since we have resources
add websockets to the requirements
register service.py in the services:

services = websockets:service.py
add INTERNET permission
android-api:18, android-minapi:23, android.sdk:28
register the custmo activity:

android.entrypoint = org.kivy.android.SpecialActivity
register the java subdir: android.add_src = java
set the app theme:

android.apptheme = "@style/AppTheme"
add the activity-library

android.add_aars = ../activity-library/app/build/outputs/aar/nativeuidemo_0.1.2-debug.aar
add ktor repository

android.add_gradle_repositories = "maven { url 'https://kotlin.bintray.com/ktor' }"
add gradle dependencies:
- org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.31
- androidx.appcompat:appcompat:1.0.2
- androidx.constraintlayout:constraintlayout:1.1.3
- io.ktor:ktor-client-core:1.2.1
- io.ktor:ktor-client-websockets:1.2.1
- io.ktor:ktor-client-cio:1.2.1
package-options to avoid name clashes

android.add_packaging_options = "exclude 'META-INF/common.kotlin_module'", "exclude 'META-INF/*.kotlin_module'"

in the root directory of the kivy-app:

$ buildozer android debug