Added pong game for tutorial purpose

buildozer.spec

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+[app]
+
+# (str) Title of your application
+title = My Application
+
+# (str) Package name
+package.name = myapp
+
+# (str) Package domain (needed for android/ios packaging)
+package.domain = org.test
+
+# (str) Source code where the main.py live
+source.dir = .
+
+# (list) Source files to include (let empty to include all the files)
+source.include_exts = py,png,jpg,kv,atlas
+
+# (list) List of inclusions using pattern matching
+#source.include_patterns = assets/*,images/*.png
+
+# (list) Source files to exclude (let empty to not exclude anything)
+#source.exclude_exts = spec
+
+# (list) List of directory to exclude (let empty to not exclude anything)
+#source.exclude_dirs = tests, bin
+
+# (list) List of exclusions using pattern matching
+#source.exclude_patterns = license,images/*/*.jpg
+
+# (str) Application versioning (method 1)
+version = 0.1
+
+# (str) Application versioning (method 2)
+# version.regex = __version__ = ['"](.*)['"]
+# version.filename = %(source.dir)s/main.py
+
+# (list) Application requirements
+# comma seperated e.g. requirements = sqlite3,kivy
+requirements = kivy
+
+# (str) Custom source folders for requirements
+# Sets custom source for any requirements with recipes
+# requirements.source.kivy = ../../kivy
+
+# (list) Garden requirements
+#garden_requirements =
+
+# (str) Presplash of the application
+#presplash.filename = %(source.dir)s/data/presplash.png
+
+# (str) Icon of the application
+#icon.filename = %(source.dir)s/data/icon.png
+
+# (str) Supported orientation (one of landscape, portrait or all)
+orientation = landscape
+
+# (list) List of service to declare
+#services = NAME:ENTRYPOINT_TO_PY,NAME2:ENTRYPOINT2_TO_PY
+
+#
+# OSX Specific
+#
+
+#
+# author = © Copyright Info
+
+#
+# Android specific
+#
+
+# (bool) Indicate if the application should be fullscreen or not
+fullscreen = 1
+
+# (list) Permissions
+#android.permissions = INTERNET
+
+# (int) Android API to use
+#android.api = 19
+
+# (int) Minimum API required
+#android.minapi = 9
+
+# (int) Android SDK version to use
+#android.sdk = 20
+
+# (str) Android NDK version to use
+#android.ndk = 9c
+
+# (bool) Use --private data storage (True) or --dir public storage (False)
+#android.private_storage = True
+
+# (str) Android NDK directory (if empty, it will be automatically downloaded.)
+#android.ndk_path =
+
+# (str) Android SDK directory (if empty, it will be automatically downloaded.)
+#android.sdk_path =
+
+# (str) ANT directory (if empty, it will be automatically downloaded.)
+#android.ant_path =
+
+# (str) python-for-android git clone directory (if empty, it will be automatically cloned from github)
+#android.p4a_dir =
+
+# (str) The directory in which python-for-android should look for your own build recipes (if any)
+#p4a.local_recipes =
+
+# (str) Filename to the hook for p4a
+#p4a.hook =
+
+# (list) python-for-android whitelist
+#android.p4a_whitelist =
+
+# (bool) If True, then skip trying to update the Android sdk
+# This can be useful to avoid excess Internet downloads or save time
+# when an update is due and you just want to test/build your package
+# android.skip_update = False
+
+# (str) Bootstrap to use for android builds (android_new only)
+# android.bootstrap = sdl2
+
+# (str) Android entry point, default is ok for Kivy-based app
+#android.entrypoint = org.renpy.android.PythonActivity
+
+# (list) List of Java .jar files to add to the libs so that pyjnius can access
+# their classes. Don't add jars that you do not need, since extra jars can slow
+# down the build process. Allows wildcards matching, for example:
+# OUYA-ODK/libs/*.jar
+#android.add_jars = foo.jar,bar.jar,path/to/more/*.jar
+
+# (list) List of Java files to add to the android project (can be java or a
+# directory containing the files)
+#android.add_src =
+
+# (str) python-for-android branch to use, if not master, useful to try
+# not yet merged features.
+#android.branch = master
+
+# (str) OUYA Console category. Should be one of GAME or APP
+# If you leave this blank, OUYA support will not be enabled
+#android.ouya.category = GAME
+
+# (str) Filename of OUYA Console icon. It must be a 732x412 png image.
+#android.ouya.icon.filename = %(source.dir)s/data/ouya_icon.png
+
+# (str) XML file to include as an intent filters in <activity> tag
+#android.manifest.intent_filters =
+
+# (list) Android additionnal libraries to copy into libs/armeabi
+#android.add_libs_armeabi = libs/android/*.so
+#android.add_libs_armeabi_v7a = libs/android-v7/*.so
+#android.add_libs_x86 = libs/android-x86/*.so
+#android.add_libs_mips = libs/android-mips/*.so
+
+# (bool) Indicate whether the screen should stay on
+# Don't forget to add the WAKE_LOCK permission if you set this to True
+#android.wakelock = False
+
+# (list) Android application meta-data to set (key=value format)
+#android.meta_data =
+
+# (list) Android library project to add (will be added in the
+# project.properties automatically.)
+#android.library_references =
+
+# (str) Android logcat filters to use
+#android.logcat_filters = *:S python:D
+
+# (bool) Copy library instead of making a libpymodules.so
+#android.copy_libs = 1
+
+# (str) The Android arch to build for, choices: armeabi-v7a, arm64-v8a, x86
+android.arch = armeabi-v7a
+
+#
+# iOS specific
+#
+
+# (str) Path to a custom kivy-ios folder
+#ios.kivy_ios_dir = ../kivy-ios
+
+# (str) Name of the certificate to use for signing the debug version
+# Get a list of available identities: buildozer ios list_identities
+#ios.codesign.debug = "iPhone Developer: <lastname> <firstname> (<hexstring>)"
+
+# (str) Name of the certificate to use for signing the release version
+#ios.codesign.release = %(ios.codesign.debug)s
+
+
+[buildozer]
+
+# (int) Log level (0 = error only, 1 = info, 2 = debug (with command output))
+log_level = 2
+
+# (int) Display warning if buildozer is run as root (0 = False, 1 = True)
+warn_on_root = 1
+
+# (str) Path to build artifact storage, absolute or relative to spec file
+# build_dir = ./.buildozer
+
+# (str) Path to build output (i.e. .apk, .ipa) storage
+# bin_dir = ./bin
+
+#    -----------------------------------------------------------------------------
+#    List as sections
+#
+#    You can define all the "list" as [section:key].
+#    Each line will be considered as a option to the list.
+#    Let's take [app] / source.exclude_patterns.
+#    Instead of doing:
+#
+#[app]
+#source.exclude_patterns = license,data/audio/*.wav,data/images/original/*
+#
+#    This can be translated into:
+#
+#[app:source.exclude_patterns]
+#license
+#data/audio/*.wav
+#data/images/original/*
+#
+
+
+#    -----------------------------------------------------------------------------
+#    Profiles
+#
+#    You can extend section / key with a profile
+#    For example, you want to deploy a demo version of your application without
+#    HD content. You could first change the title to add "(demo)" in the name
+#    and extend the excluded directories to remove the HD content.
+#
+#[app@demo]
+#title = My Application (demo)
+#
+#[app:source.exclude_patterns@demo]
+#images/hd/*
+#
+#    Then, invoke the command line with the "demo" profile:
+#
+#buildozer --profile demo android debug

pong.kv

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+#:kivy 1.0.9
+
+<PongBall>:
+    size: 50, 50 
+    canvas:
+        Ellipse:
+            pos: self.pos
+            size: self.size          
+
+<PongPaddle>:
+    size: 25, 200
+    canvas:
+        Rectangle:
+            pos:self.pos
+            size:self.size
+
+<PongGame>:
+    ball: pong_ball
+    player1: player_left
+    player2: player_right
+
+    canvas:
+        Rectangle:
+            pos: self.center_x-5, 0
+            size: 10, self.height
+
+    Label:
+        font_size: 70  
+        center_x: root.width / 4
+        top: root.top - 50
+        text: str(root.player1.score)
+
+    Label:
+        font_size: 70  
+        center_x: root.width * 3 / 4
+        top: root.top - 50
+        text: str(root.player2.score)
+
+    PongBall:
+        id: pong_ball
+        center: self.parent.center
+
+    PongPaddle:
+        id: player_left
+        x: root.x
+        center_y: root.center_y
+
+    PongPaddle:
+        id: player_right
+        x: root.width-self.width
+        center_y: root.center_y

pong_game_final.py

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+from kivy.app import App
+from kivy.uix.widget import Widget
+from kivy.properties import NumericProperty, ReferenceListProperty,\
+    ObjectProperty
+from kivy.vector import Vector
+from kivy.clock import Clock
+
+
+class PongPaddle(Widget):
+    score = NumericProperty(0)
+
+    def bounce_ball(self, ball):
+        if self.collide_widget(ball):
+            vx, vy = ball.velocity
+            offset = (ball.center_y - self.center_y) / (self.height / 2)
+            bounced = Vector(-1 * vx, vy)
+            vel = bounced * 1.1
+            ball.velocity = vel.x, vel.y + offset
+
+
+class PongBall(Widget):
+    velocity_x = NumericProperty(0)
+    velocity_y = NumericProperty(0)
+    velocity = ReferenceListProperty(velocity_x, velocity_y)
+
+    def move(self):
+        self.pos = Vector(*self.velocity) + self.pos
+
+
+class PongGame(Widget):
+    ball = ObjectProperty(None)
+    player1 = ObjectProperty(None)
+    player2 = ObjectProperty(None)
+
+    def serve_ball(self, vel=(4, 0)):
+        self.ball.center = self.center
+        self.ball.velocity = vel
+
+    def update(self, dt):
+        self.ball.move()
+
+        # bounce of paddles
+        self.player1.bounce_ball(self.ball)
+        self.player2.bounce_ball(self.ball)
+
+        # bounce ball off bottom or top
+        if (self.ball.y < self.y) or (self.ball.top > self.top):
+            self.ball.velocity_y *= -1
+
+        # went of to a side to score point?
+        if self.ball.x < self.x:
+            self.player2.score += 1
+            self.serve_ball(vel=(4, 0))
+        if self.ball.x > self.width:
+            self.player1.score += 1
+            self.serve_ball(vel=(-4, 0))
+
+    def on_touch_move(self, touch):
+        if touch.x < self.width / 3:
+            self.player1.center_y = touch.y
+        if touch.x > self.width - self.width / 3:
+            self.player2.center_y = touch.y
+
+
+class PongApp(App):
+    def build(self):
+        game = PongGame()
+        game.serve_ball()
+        Clock.schedule_interval(game.update, 1.0 / 60.0)
+        return game
+
+
+if __name__ == '__main__':
+    PongApp().run()