Edited at

Raspberry PIでKivyが使えないトラブルの対処法


はじめに

Kivyでアプリケーションを開発しようと思ったら起動できなかったので、その解決方法をメモしておきます。


Kivyのインストール

以下のコマンドを順次実行。

ソフトウェアのデータ更新

sudo apt-get update

ライブラリのインストール

sudo apt-get install libsdl2-dev libsdl2-image-dev libsdl2-mixer-dev libsdl2-ttf-dev \

pkg-config libgl1-mesa-dev libgles2-mesa-dev \
python-setuptools libgstreamer1.0-dev git-core \
gstreamer1.0-plugins-{bad,base,good,ugly} \
gstreamer1.0-{omx,alsa} python-dev libmtdev-dev \
xclip xsel python-pip

Cythonのバージョンを指定してインストール

sudo pip install -U Cython==0.28.2

Kivyのソースをダウンロードしてインストール

sudo pip install git+https://github.com/kivy/kivy.git@master

インストールが終わったところで、以下のサンプルスクリプトを作成。


main.py

#-*- coding: utf-8 -*-


from kivy.app import App
from kivy.uix.label import Label

class TestApp(App):
def build(self):
return Label(text='Hello World')

TestApp().run()


以下のコマンドで実行

python main.py

実行すると以下のエラーが...

[INFO   ] [Logger      ] Record log in /home/pi/.kivy/logs/kivy_19-02-13_1.txt

[INFO ] [Kivy ] v1.11.0.dev0, git-233cdd1, 20190213
[INFO ] [Python ] v2.7.13 (default, Sep 26 2018, 18:42:22)
[GCC 6.3.0 20170516]
[INFO ] [Factory ] 184 symbols loaded
[INFO ] [Image ] Providers: img_tex, img_dds, img_gif (img_sdl2, img_pil, img_ffpyplayer ignored)
[INFO ] [Text ] Provider: sdl2
[INFO ] [Window ] Provider: egl_rpi
[INFO ] [GL ] Using the "OpenGL ES 2" graphics system
[INFO ] [GL ] Backend used <sdl2>
Segmentation fault

Kivy用の設定を実行

export KIVY_GL_BACKEND=gl

再度スクリプトを実行

python main.py

すると、今度は別のエラーが...

[INFO   ] [Logger      ] Record log in /home/pi/.kivy/logs/kivy_19-02-13_2.txt

[INFO ] [Kivy ] v1.11.0.dev0, git-233cdd1, 20190213
[INFO ] [Python ] v2.7.13 (default, Sep 26 2018, 18:42:22)
[GCC 6.3.0 20170516]
[INFO ] [Factory ] 184 symbols loaded
[INFO ] [Image ] Providers: img_tex, img_dds, img_gif (img_sdl2, img_pil, img_ffpyplayer ignored)
[INFO ] [Text ] Provider: sdl2
[INFO ] [Window ] Provider: egl_rpi
[INFO ] [GL ] Using the "OpenGL ES 2" graphics system
[INFO ] [GL ] Backend used <gl>
[INFO ] [GL ] OpenGL version <OpenGL ES 2.0>
[INFO ] [GL ] OpenGL vendor <Broadcom>
[INFO ] [GL ] OpenGL renderer <VideoCore IV HW>
[INFO ] [GL ] OpenGL parsed version: 2, 0
[INFO ] [GL ] Shading version <OpenGL ES GLSL ES 1.00>
[INFO ] [GL ] Texture max size <2048>
[INFO ] [GL ] Texture max units <8>
[INFO ] [Window ] Provider: sdl2(['window_egl_rpi'] ignored)
[CRITICAL] [Window ] Unable to find any valuable Window provider.
egl_rpi - Exception: Unknown <png> type, no loader found.
File "/usr/local/lib/python2.7/dist-packages/kivy/core/__init__.py", line 67, in core_select_lib
cls = cls()
File "/usr/local/lib/python2.7/dist-packages/kivy/core/window/__init__.py", line 968, in __init__
self.create_window()
File "/usr/local/lib/python2.7/dist-packages/kivy/core/window/window_egl_rpi.py", line 39, in create_window
super(WindowEglRpi, self).create_window()
File "/usr/local/lib/python2.7/dist-packages/kivy/core/window/__init__.py", line 1216, in create_window
self.render_context = RenderContext()
File "kivy/graphics/instructions.pyx", line 783, in kivy.graphics.instructions.RenderContext.__init__
File "/usr/local/lib/python2.7/dist-packages/kivy/core/image/__init__.py", line 561, in __init__
self.filename = arg
File "/usr/local/lib/python2.7/dist-packages/kivy/core/image/__init__.py", line 757, in _set_filename
mipmap=self._mipmap, nocache=self._nocache)
File "/usr/local/lib/python2.7/dist-packages/kivy/core/image/__init__.py", line 463, in load
raise Exception('Unknown <%s> type, no loader found.' % ext)

sdl2 - RuntimeError: No available video device
File "/usr/local/lib/python2.7/dist-packages/kivy/core/__init__.py", line 67, in core_select_lib
cls = cls()
File "/usr/local/lib/python2.7/dist-packages/kivy/core/window/window_sdl2.py", line 140, in __init__
super(WindowSDL, self).__init__()
File "/usr/local/lib/python2.7/dist-packages/kivy/core/window/__init__.py", line 968, in __init__
self.create_window()
File "/usr/local/lib/python2.7/dist-packages/kivy/core/window/window_sdl2.py", line 271, in create_window
self.fullscreen, resizable, state)
File "kivy/core/window/_window_sdl2.pyx", line 103, in kivy.core.window._window_sdl2._WindowSDL2Storage.setup_window
File "kivy/core/window/_window_sdl2.pyx", line 67, in kivy.core.window._window_sdl2._WindowSDL2Storage.die

x11 - ImportError: No module named window_x11
File "/usr/local/lib/python2.7/dist-packages/kivy/core/__init__.py", line 59, in core_select_lib
fromlist=[modulename], level=0)

[CRITICAL] [App ] Unable to get a Window, abort.


解決方法

以下のコマンドを実行し、PILをインストール

sudo apt install -y python-pil

...できた(-_-;)

わかれば一瞬ですが、わからないとずっとかかりきりになって、全然他のことが進まない。


おまけ

export KIVY_GL_BACKEND=gl

上記コマンドを再起動の度に実行しなくてはならないが、スクリプトを以下のとおり修正することで、上記コマンドの実行が必要なくなります。


main.py

#-*- coding: utf-8 -*-


import os
os.environ['KIVY_GL_BACKEND'] = 'gl'

from kivy.app import App
from kivy.uix.label import Label

class TestApp(App):
def build(self):
return Label(text='Hello World')

TestApp().run()


以上、終了。