Question

我有带相机的简单android kivy应用程序。当我在kivy启动器（android 7.0）上运行该应用程序时，我仅看到按钮，而没有相机。当我用camera.export_to_png("image.png")拍照时，它仅保存白色图像。代码：

from kivy.app import App
from kivy.uix.camera import Camera
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button


class cameraapp (App):
    def build(self):
        layout = BoxLayout(orientation='vertical')

        self.cameraObject = Camera(play=True)

        self.camaraClick = Button(text="Take Photo")
        self.camaraClick.size_hint=(.5, .2)
        self.camaraClick.pos_hint={'x': .25, 'y':.75}
        self.camaraClick.bind(on_press=self.onCameraClick)

        layout.add_widget(self.cameraObject)
        layout.add_widget(self.camaraClick)

        # return the root widget
        return layout

    def onCameraClick(self, *args):
        self.cameraObject.export_to_png('image.png')


if __name__ == '__main__':
    cameraapp().run()

此外，当我要设置分辨率时，它会崩溃（我只是粘贴错误日志的末尾）：

   File "C:\Users\user\Anaconda3\lib\site-packages\kivy\core\camera\camera_opencv.py", line 117, in init_camera
     self._resolution = (int(frame.shape[1]), int(frame.shape[0]))
 AttributeError: 'NoneType' object has no attribute 'shape'

白色图像代替相机预览

0 个答案: