Issue while reading an image in android phone using Kivy

[Martyn Ponting]

Hello,

I am new to Kivy.

I want to simply read an image file. I have already given a relative path to it . I also made changes to buildozer.spec file. Still the image is not read on phone/android. If I run the code on computer, then the image is getting displayed.

On mobile/android, I am only getting a black screen with a small white square at the bottom as output

Any help will be appreciated as I have been struggling with this for days now.

Error:

05-18 14:37:33.079 18567 18630 I python  : Initializing Python for Android

05-18 14:37:33.079 18567 18630 I python  : Setting additional env vars from p4a_env_vars.txt

05-18 14:37:33.079 18567 18630 I python  : Changing directory to the one provided by ANDROID_ARGUMENT

05-18 14:37:33.079 18567 18630 I python  : /data/user/0/org.test.myapp/files/app

05-18 14:37:33.079 18567 18630 I python  : Preparing to initialize python

05-18 14:37:33.079 18567 18630 I python  : _python_bundle dir exists

05-18 14:37:33.080 18567 18630 I python  : calculated paths to be...

05-18 14:37:33.080 18567 18630 I python  : /data/user/0/org.test.myapp/files/app/_python_bundle/stdlib.zip:/data/user/0/org.test.myapp/files/app/_python_bundle/modules

05-18 14:37:33.080 18567 18630 I python  : set wchar paths...

05-18 14:37:33.127 18567 18630 I python  : Initialized python

05-18 14:37:33.127 18567 18630 I python  : AND: Init threads

05-18 14:37:33.128 18567 18630 I python  : testing python print redirection

05-18 14:37:33.129 18567 18630 I python  : Android path ['.', '/data/user/0/org.test.myapp/files/app/_python_bundle/stdlib.zip', '/data/user/0/org.test.myapp/files/app/_python_bundle/modules', '/data/user/0/org.test.myapp/files/app/_python_bundle/site-packages']

05-18 14:37:33.129 18567 18630 I python  : os.environ is environ({'PATH': '/sbin:/system/sbin:/product/bin:/apex/com.android.runtime/bin:/system/bin:/system/xbin:/odm/bin:/vendor/bin:/vendor/xbin', 'ANDROID_BOOTLOGO': '1', 'ANDROID_ROOT': '/system', 'ANDROID_ASSETS': '/system/app', 'ANDROID_DATA': '/data', 'ANDROID_STORAGE': '/storage', 'ANDROID_RUNTIME_ROOT': '/apex/com.android.runtime', 'ANDROID_TZDATA_ROOT': '/apex/com.android.tzdata', 'EXTERNAL_STORAGE': '/sdcard', 'ASEC_MOUNTPOINT': '/mnt/asec', 'BOOTCLASSPATH': '/apex/com.android.runtime/javalib/core-oj.jar:/apex/com.android.runtime/javalib/core-libart.jar:/apex/com.android.runtime/javalib/okhttp.jar:/apex/com.android.runtime/javalib/bouncycastle.jar:/apex/com.android.runtime/javalib/apache-xml.jar:/system/framework/QPerformance.jar:/system/framework/UxPerformance.jar:/system/framework/framework.jar:/system/framework/ext.jar:/system/framework/telephony-common.jar:/system/framework/voip-common.jar:/system/framework/ims-common.jar:/system/framework/android.test.base.jar:/system/framework/tcmiface.jar:/system/framework/telephony-ext.jar:/system/framework/WfdCommon.jar:/system/framework/qcom.fmradio.jar:/apex/com.android.conscrypt/javalib/conscrypt.jar:/apex/com.android.media/javalib/updatable-media.jar', 'DEX2OATBOOTCLASSPATH': '/apex/com.android.runtime/javalib/core-oj.jar:/apex/com.android.runtime/javalib/core-libart.jar:/apex/com.android.runtime/javalib/okhttp.jar:/apex/com.android.runtime/javalib/bouncycastle.jar:/apex/com.android.runtime/javalib/apache-xml.jar:/system/framework/QPerformance.jar:/system/framework/UxPerformance.jar:/system/framework/framework.jar:/system/framework/ext.jar:/system/framework/telephony-common.jar:/system/framework/voip-common.jar:/system/framework/ims-common.jar:/system/framework/android.test.base.jar:/system/framework/tcmiface.jar:/system/framework/telephony-ext.jar:/system/framework/WfdCommon.jar:/system/framework/qcom.fmradio.jar', 'SYSTEMSERVERCLASSPATH': '/system/framework/services.jar:/system/framework/ethernet-service.jar:/system/framework/wifi-service.jar:/system/framework/com.android.location.provider.jar', 'DOWNLOAD_CACHE': '/data/cache', 'ANDROID_SOCKET_zygote_secondary': '19', 'ANDROID_SOCKET_usap_pool_secondary': '20', 'ANDROID_ENTRYPOINT': 'main.pyc', 'ANDROID_ARGUMENT': '/data/user/0/org.test.myapp/files/app', 'ANDROID_APP_PATH': '/data/user/0/org.test.myapp/files/app', 'ANDROID_PRIVATE': '/data/user/0/org.test.myapp/files', 'ANDROID_UNPACK': '/data/user/0/org.test.myapp/files/app', 'PYTHONHOME': '/data/user/0/org.test.myapp/files/app', 'PYTHONPATH': '/data/user/0/org.test.myapp/files/app:/data/user/0/org.test.myapp/files/app/lib', 'PYTHONOPTIMIZE': '2', 'P4A_BOOTSTRAP': 'SDL2', 'PYTHON_NAME': 'python', 'P4A_IS_WINDOWED': 'True', 'P4A_ORIENTATION': 'portrait', 'P4A_NUMERIC_VERSION': 'None', 'P4A_MINSDK': '21', 'LC_CTYPE': 'C.UTF-8'})

05-18 14:37:33.129 18567 18630 I python  : Android kivy bootstrap done. __name__ is __main__

05-18 14:37:33.129 18567 18630 I python  : AND: Ran string

05-18 14:37:33.129 18567 18630 I python  : Run user program, change dir and execute entrypoint

05-18 14:37:33.347 18567 18630 I python  : [WARNING] [Config      ] Older configuration version detected (0 instead of 21)

05-18 14:37:33.348 18567 18630 I python  : [WARNING] [Config      ] Upgrading configuration in progress.

05-18 14:37:33.352 18567 18630 I python  : [INFO   ] [Logger      ] Record log in /data/user/0/org.test.myapp/files/app/.kivy/logs/kivy_21-05-18_0.txt

05-18 14:37:33.353 18567 18630 I python  : [INFO   ] [Kivy        ] v1.11.1

05-18 14:37:33.353 18567 18630 I python  : [INFO   ] [Kivy        ] Installed at "/data/user/0/org.test.myapp/files/app/_python_bundle/site-packages/kivy/__init__.pyc"

05-18 14:37:33.353 18567 18630 I python  : [INFO   ] [Python      ] v3.8.1 (default, May 17 2021, 15:59:57) 

05-18 14:37:33.353 18567 18630 I python  : [Clang 8.0.2 (https://android.googlesource.com/toolchain/clang 40173bab62ec7462

05-18 14:37:33.353 18567 18630 I python  : [INFO   ] [Python      ] Interpreter at ""

05-18 14:37:33.942 18567 18630 I python  : [INFO   ] [Factory     ] 184 symbols loaded

05-18 14:37:33.987 18567 18630 I python  : [INFO   ] [Image       ] Providers: img_tex, img_dds, img_sdl2, img_gif (img_pil, img_ffpyplayer ignored)

05-18 14:37:34.286 18567 18630 I python  : [INFO   ] [Window      ] Provider: sdl2

05-18 14:37:34.312 18567 18630 I python  : [INFO   ] [GL          ] Using the "OpenGL ES 2" graphics system

05-18 14:37:34.314 18567 18630 I python  : [INFO   ] [GL          ] Backend used <sdl2>

05-18 14:37:34.314 18567 18630 I python  : [INFO   ] [GL          ] OpenGL version <b'OpenGL ES 3.2 V@415.0 (GIT@f2ab992, I401605978b, 1569657027) (Date:09/28/19)'>

05-18 14:37:34.314 18567 18630 I python  : [INFO   ] [GL          ] OpenGL vendor <b'Qualcomm'>

05-18 14:37:34.315 18567 18630 I python  : [INFO   ] [GL          ] OpenGL renderer <b'Adreno (TM) 512'>

05-18 14:37:34.315 18567 18630 I python  : [INFO   ] [GL          ] OpenGL parsed version: 3, 2

05-18 14:37:34.316 18567 18630 I python  : [INFO   ] [GL          ] Texture max size <16384>

05-18 14:37:34.316 18567 18630 I python  : [INFO   ] [GL          ] Texture max units <16>

05-18 14:37:34.349 18567 18630 I python  : [INFO   ] [Window      ] auto add sdl2 input provider

05-18 14:37:34.350 18567 18630 I python  : [INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked

05-18 14:37:34.353 18567 18630 I python  : [ERROR  ] [Image       ] Error reading file ./images/image1.png

05-18 14:37:34.354 18567 18630 I python  : [WARNING] [Base        ] Unknown <android> provider

05-18 14:37:34.354 18567 18630 I python  : [INFO   ] [Base        ] Start application main loop

My code:

import kivy

from kivy.uix.floatlayout import FloatLayout

import os

from kivy.app import App

kivy.require('1.7.0')

from kivy.uix.image import Image

class MyApp(App):

    def build(self):

        layout=FloatLayout()

        script_dir = os.path.dirname(__file__)

        rel_path = "./images/"

        abs_file_path = os.path.join(script_dir, rel_path)

        current_file ="image1.png"

        img=Image(source=abs_file_path+current_file)

        layout.add_widget(img)

        return layout

MyApp().run()

I have stored the "image1.png" image in the images folder. This folder is present in the same directory as my main.py

My Buildozer.spec file: (I have highlighted the 2 lines where I have made changes)

# (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, venv

# (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 separated e.g. requirements = sqlite3,kivy

requirements = python3,kivy

# (str) Custom source folders for requirements

# Sets custom source for any requirements with recipes

# requirements.source.kivy = ../../kivy

# (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, sensorLandscape, portrait or all)

orientation = portrait

# (list) List of service to declare

#services = NAME:ENTRYPOINT_TO_PY,NAME2:ENTRYPOINT2_TO_PY

#

# OSX Specific

#

#

# author = © Copyright Info

# change the major version of python used by the app

osx.python_version = 3

# Kivy version to use

osx.kivy_version = 1.9.1

#

# Android specific

#

# (bool) Indicate if the application should be fullscreen or not

fullscreen = 0

# (string) Presplash background color (for android toolchain)

# Supported formats are: #RRGGBB #AARRGGBB or one of the following names:

# red, blue, green, black, white, gray, cyan, magenta, yellow, lightgray,

# darkgray, grey, lightgrey, darkgrey, aqua, fuchsia, lime, maroon, navy,

# olive, purple, silver, teal.

#android.presplash_color = #FFFFFF

# (string) Presplash animation using Lottie format.

# see https://lottiefiles.com/ for examples and https://airbnb.design/lottie/

# for general documentation.

# Lottie files can be created using various tools, like Adobe After Effect or Synfig.

#android.presplash_lottie = "path/to/lottie/file.json"

# (str) Adaptive icon of the application (used if Android API level is 26+ at runtime)

#icon.adaptive_foreground.filename = %(source.dir)s/data/icon_fg.png

#icon.adaptive_background.filename = %(source.dir)s/data/icon_bg.png

# (list) Permissions

#android.permissions = INTERNET

# (list) features (adds uses-feature -tags to manifest)

#android.features = android.hardware.usb.host

# (int) Target Android API, should be as high as possible.

#android.api = 27

# (int) Minimum API your APK will support.

#android.minapi = 21

# (int) Android SDK version to use

#android.sdk = 20

# (str) Android NDK version to use

#android.ndk = 19b

# (int) Android NDK API to use. This is the minimum API your app will support, it should usually match android.minapi.

#android.ndk_api = 21

# (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 =

# (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

# (bool) If True, then automatically accept SDK license

# agreements. This is intended for automation only. If set to False,

# the default, you will be shown the license when first running

# buildozer.

# android.accept_sdk_license = False

# (str) Android entry point, default is ok for Kivy-based app

#android.entrypoint = org.renpy.android.PythonActivity

# (str) Android app theme, default is ok for Kivy-based app

# android.apptheme = "@android:style/Theme.NoTitleBar"

# (list) Pattern to whitelist for the whole project

#android.whitelist =

# (str) Path to a custom whitelist file

#android.whitelist_src =

# (str) Path to a custom blacklist file

#android.blacklist_src =

# (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 =

# (list) Android AAR archives to add

#android.add_aars =

# (list) Gradle dependencies to add

#android.gradle_dependencies =

# (bool) Enable AndroidX support. Enable when 'android.gradle_dependencies'

# contains an 'androidx' package, or any package from Kotlin source.

# android.enable_androidx requires android.api >= 28

#android.enable_androidx = False

# (list) add java compile options

# this can for example be necessary when importing certain java libraries using the 'android.gradle_dependencies' option

# see https://developer.android.com/studio/write/java8-support for further information

# android.add_compile_options = "sourceCompatibility = 1.8", "targetCompatibility = 1.8"

# (list) Gradle repositories to add {can be necessary for some android.gradle_dependencies}

# please enclose in double quotes 

# e.g. android.gradle_repositories = "maven { url 'https://kotlin.bintray.com/ktor' }"

#android.add_gradle_repositories =

# (list) packaging options to add 

# see https://google.github.io/android-gradle-dsl/current/com.android.build.gradle.internal.dsl.PackagingOptions.html

# can be necessary to solve conflicts in gradle_dependencies

# please enclose in double quotes 

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

#android.add_packaging_options =

# (list) Java classes to add as activities to the manifest.

#android.add_activities = com.example.ExampleActivity

# (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 =

# (str) launchMode to set for the main activity

#android.manifest.launch_mode = standard

# (list) Android additional 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_arm64_v8a = libs/android-v8/*.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 =

# (list) Android shared libraries which will be added to AndroidManifest.xml using <uses-library> tag

#android.uses_library =

# (str) Android logcat filters to use

android.logcat_filters = *:S python:D

# (bool) Android logcat only display log for activity's pid

#android.logcat_pid_only = False

# (str) Android additional adb arguments

#android.adb_args = -H host.docker.internal

# (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, x86_64

android.arch = armeabi-v7a

# (int) overrides automatic versionCode computation (used in build.gradle)

# this is not the same as app version and should only be edited if you know what you're doing

# android.numeric_version = 1

# (bool) enables Android auto backup feature (Android API >=23)

android.allow_backup = True

# (str) XML file for custom backup rules (see official auto backup documentation)

# android.backup_rules =

# (str) If you need to insert variables into your AndroidManifest.xml file,

# you can do so with the manifestPlaceholders property.

# This property takes a map of key-value pairs. (via a string)

# Usage example : android.manifest_placeholders = [myCustomUrl:\"org.kivy.customurl\"]

# android.manifest_placeholders = [:]

# (bool) disables the compilation of py to pyc/pyo files when packaging

# android.no-compile-pyo = True

#

# Python for android (p4a) specific

#

# (str) python-for-android URL to use for checkout

#p4a.url =

# (str) python-for-android fork to use in case if p4a.url is not specified, defaults to upstream (kivy)

#p4a.fork = kivy

# (str) python-for-android branch to use, defaults to master

#p4a.branch = master

# (str) python-for-android git clone directory (if empty, it will be automatically cloned from github)

#p4a.source_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 =

# (str) Bootstrap to use for android builds

# p4a.bootstrap = sdl2

# (int) port number to specify an explicit --port= p4a argument (eg for bootstrap flask)

#p4a.port =

# Control passing the --use-setup-py vs --ignore-setup-py to p4a

# "in the future" --use-setup-py is going to be the default behaviour in p4a, right now it is not

# Setting this to false will pass --ignore-setup-py, true will pass --use-setup-py

# NOTE: this is general setuptools integration, having pyproject.toml is enough, no need to generate

# setup.py if you're using Poetry, but you need to add "toml" to source.include_exts.

#p4a.setup_py = false

#

# iOS specific

#

# (str) Path to a custom kivy-ios folder

#ios.kivy_ios_dir = ../kivy-ios

# Alternately, specify the URL and branch of a git checkout:

ios.kivy_ios_url = https://github.com/kivy/kivy-ios

ios.kivy_ios_branch = master

# Another platform dependency: ios-deploy

# Uncomment to use a custom checkout

#ios.ios_deploy_dir = ../ios_deploy

# Or specify URL and branch

ios.ios_deploy_url = https://github.com/phonegap/ios-deploy

ios.ios_deploy_branch = 1.10.0

# (bool) Whether or not to sign the code

ios.codesign.allowed = false

# (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) The development team to use for signing the debug version

#ios.codesign.development_team.debug = <hexstring>

# (str) Name of the certificate to use for signing the release version

#ios.codesign.release = %(ios.codesign.debug)s

# (str) The development team to use for signing the release version

#ios.codesign.development_team.release = <hexstring>

# (str) URL pointing to .ipa file to be installed

# This option should be defined along with `display_image_url` and `full_size_image_url` options.

#ios.manifest.app_url =

# (str) URL pointing to an icon (57x57px) to be displayed during download

# This option should be defined along with `app_url` and `full_size_image_url` options.

#ios.manifest.display_image_url =

# (str) URL pointing to a large icon (512x512px) to be used by iTunes

# This option should be defined along with `app_url` and `display_image_url` options.

#ios.manifest.full_size_image_url =

[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

[Robert]

I tried the .py with the default buildozer.spec  - worked for me on Android.

Unrelated: should always use  kivy==2.0.0 in requirements

[Martyn Ponting]

Thanks for the reply Robert.

What else could be the issue. I am using Ubuntu on virtual machine for apk creation

[Robert]

I used Ubuntu on virtual machine too.

[Martyn Ponting]

Hey Robert,

Solved the error. There was issue with some dependency. Created a new machine and that solved the error. Thank you so much for your help.

[Robert]

Some background reading https://github.com/RobertFlatt/Android-for-Python/tree/main/Android-for-Python-Users#buildozer-and-p4a

[Martyn Ponting]

Thanks for sharing