kivy(python-for-android): opencv

I/python  (11272): Traceback (most recent call last):
I/python  (11272):   File "/home/alex/workspace/python-for-android/build/python-install/lib/python2.7/site-packages/kivy/core/__init__.py", line 47, in core_select_lib
I/python  (11272):   File "/home/alex/workspace/python-for-android/build/python-install/lib/python2.7/site-packages/kivy/core/camera/camera_opencv.py", line 20, in <module>
I/python  (11272): ImportError: No module named cv
I/python  (11272): [CRITICAL] [Camera      ] Unable to find any valuable Camera provider at all!
I/python  (11272): [INFO   ] [Text        ] using <pygame> as text provider
I/python  (11272): [DEBUG  ] [App         ] Loading kv <./main.kv>
I/python  (11272): [DEBUG  ] [App         ] kv <./main.kv> not found
I/python  (11272): [INFO   ] [Window      ] using <pygame> as window provider
I/libSDL  (11272): SDL_SetVideoMode(): application requested mode 1280x720
I/python  (11272): [DEBUG  ] [Window      ] Display driver android
I/python  (11272): [DEBUG  ] [Window      ] Actual window size: 1280x720
I/python  (11272): [INFO   ] [GL          ] OpenGL version <OpenGL ES 2.0>
I/python  (11272): [INFO   ] [GL          ] OpenGL vendor <ARM>
I/python  (11272): [INFO   ] [GL          ] OpenGL renderer <Mali-400 MP>
I/python  (11272): [INFO   ] [GL          ] OpenGL parsed version: 2, 0
I/python  (11272): [INFO   ] [GL          ] Shading version <OpenGL ES GLSL ES 1.00>
I/python  (11272): [INFO   ] [GL          ] Texture max size <4096>
I/python  (11272): [INFO   ] [GL          ] Texture max units <8>
I/python  (11272): [INFO   ] [Shader      ] fragment compiled successfully
I/python  (11272): [INFO   ] [Shader      ] vertex compiled successfully
I/python  (11272): [DEBUG  ] [ImagePygame ] Load </data/data/org.dev.python/files/lib/python2.7/site-packages/kivy/data/glsl/default.png>
I/python  (11272): [INFO   ] [Support     ] Android install hooks
I/python  (11272): [INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked
I/python  (11272):  Traceback (most recent call last):
I/python  (11272):    File "/home/alex/workspace/camera/main.py", line 38, in <module>
I/python  (11272):    File "/home/alex/workspace/python-for-android/build/python-install/lib/python2.7/site-packages/kivy/app.py", line 527, in run
I/python  (11272):    File "/home/alex/workspace/camera/main.py", line 16, in build
I/python  (11272):    File "/home/alex/workspace/python-for-android/build/python-install/lib/python2.7/site-packages/kivy/uix/camera.py", line 90, in __init__
I/python  (11272):    File "/home/alex/workspace/python-for-android/build/python-install/lib/python2.7/site-packages/kivy/uix/camera.py", line 102, in _on_index
I/python  (11272):  TypeError: 'NoneType' object is not callable
I/python  (11272): Python for android ended.