python - 在 centos 7 上使用 SDL2 运行 kivy 1.9.1

Question

我试图让 kivy 在 centos 7 上与 SDL2 一起工作，但是当我运行我的 main.py 时，我收到以下消息:

[INFO   ] [Logger      ] Record log in /home/etienne/.kivy/logs/kivy_16-01-14_51.txt
[INFO   ] [Kivy        ] v1.9.1
[INFO   ] [Python      ] v2.7.5 (default, Nov 20 2015, 02:00:19) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-4)]
[INFO   ] [Factory     ] 179 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_gif, img_pil (img_pygame, img_ffpyplayer ignored)
[CRITICAL] [Window      ] Unable to find any valuable Window provider at all!
egl_rpi - ImportError: cannot import name bcm
  File "/home/etienne/Demo/Test/test_virtualenv/lib/python2.7/site-packages/kivy/core/__init__.py", line 59, in core_select_lib
    fromlist=[modulename], level=0)
  File "/home/etienne/Demo/Test/test_virtualenv/lib/python2.7/site-packages/kivy/core/window/window_egl_rpi.py", line 12, in <module>
    from kivy.lib.vidcore_lite import bcm, egl

pygame - ImportError: No module named pygame
  File "/home/etienne/Demo/Test/test_virtualenv/lib/python2.7/site-packages/kivy/core/__init__.py", line 59, in core_select_lib
    fromlist=[modulename], level=0)
  File "/home/etienne/Demo/Test/test_virtualenv/lib/python2.7/site-packages/kivy/core/window/window_pygame.py", line 8, in <module>
    import pygame

x11 - ImportError: No module named window_x11
  File "/home/etienne/Demo/Test/test_virtualenv/lib/python2.7/site-packages/kivy/core/__init__.py", line 59, in core_select_lib
    fromlist=[modulename], level=0)

[INFO   ] [Text        ] Provider: pil(['text_pygame'] ignored)
[CRITICAL] [App         ] Unable to get a Window, abort.
 Exception SystemExit: 1 in 'kivy.properties.dpi2px' ignored
[CRITICAL] [App         ] Unable to get a Window, abort.
 Exception SystemExit: 1 in 'kivy.properties.dpi2px' ignored
[CRITICAL] [App         ] Unable to get a Window, abort.
 Exception SystemExit: 1 in 'kivy.properties.dpi2px' ignored
[CRITICAL] [App         ] Unable to get a Window, abort.

我已经安装了以下库:

SDL.x86_64                            1.2.15-14.el7                  @base      
SDL-devel.x86_64                      1.2.15-14.el7                  @base      
SDL2.x86_64                           2.0.3-9.el7                    @epel      
SDL2-devel.x86_64                     2.0.3-9.el7                    @epel      
SDL_image.x86_64                      1.2.12-11.el7                  @epel      
SDL_mixer.x86_64                      1.2.12-4.el7                   @epel      
SDL_mixer-devel.x86_64                1.2.12-4.el7                   @epel      
SDL_ttf.x86_64                        2.0.11-6.el7                   @epel      
SDL_ttf-devel.x86_64                  2.0.11-6.el7                   @epel   

我让它在 Fedora 20 上与相同的 main.py 一起工作，如果我安装 pygame 它也能工作，但他太重了所以我想使用 SDL2。
如果您对如何让它发挥作用有任何想法；)

Answer 1

因为你在你的虚拟环境中自己安装了kivy，它在安装时被编译了。 Kivy 在编译时检测可用的库。如果你在那之后安装了 SDL2 库，kivy 将不会立即支持 SDL2。你应该用

重新安装 kivy

pip install --upgrade --force-reinstall kivy

您可能会注意到，在安装过程中，SDL2 库在控制台输出的开头被正确检测到。之后，当您运行该应用程序时，您应该会看到可用的 SDL2 提供程序:

[INFO   ] [Logger      ] Record log in /home/u1/.kivy/logs/kivy_16-06-03_4.txt
[INFO   ] [Kivy        ] v1.9.1
[INFO   ] [Python      ] v2.7.10 (default, May 24 2015, 14:46:10) [GCC]
[INFO   ] [Factory     ] 179 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_gif, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO   ] [OSC         ] using <multiprocessing> for socket
[INFO   ] [Window      ] Provider: sdl2(['window_egl_rpi'] ignored)