android - 如何制作图像并在下一页显示
问题描述
下午好，我使用 Python 和 Kivy 编写了一个简单的相机程序，但我就是无法拍摄。您需要拍摄“ScreenThree”的快照（将其保存在手机内存中）并将生成的图像显示在“ScreenFour”上。
我使用 kivy.uix.camera 来显示相机，使用 kivymd 和 kv 来创建界面。android.permissions:INTERNET,CAMERA,WRITE_EXTERNAL_STORAGE,READ_EXTERNAL_STORAGE
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.camera import Camera
from kivymd.theming import ThemeManager
import time
Builder.load_string("""
#:import MDFillRoundFlatButton kivymd.button.MDFillRoundFlatButton
#:import MDIconButton kivymd.button.MDIconButton
<ScreenOne@Screen>:
canvas:
Color:
rgb: [.30,.50,.99]
Rectangle:
pos: self.pos
size: self.size
FloatLayout:
MDFillRoundFlatButton:
color: [1,1,1,1]
text: "Перейти к созданию фото"
pos_hint: {'center_x':.50, 'center_y':.50}
on_press:
root.manager.transition.direction = 'up'
root.manager.transition.duration = 1
root.manager.current = 'screen_two'
<ScreenTwo@Screen>:
canvas:
Color:
rgb: [.30,.50,.99]
Rectangle:
pos: self.pos
size: self.size
FloatLayout:
MDFillRoundFlatButton:
color: [1,1,1,1]
text: "Выбрать фон"
pos_hint: {'center_x':.50, 'center_y':.10}
on_press:
root.manager.transition.direction = 'up'
root.manager.transition.duration = 1
root.manager.current = 'screen_three'
MDIconButton:
icon: 'chevron-double-right'
pos_hint: {'center_x':.95, 'center_y':.10}
on_press:
root.manager.transition.direction = 'down'
root.manager.transition.duration = 1
root.manager.current = 'screen_one'
<ScreenThree@Screen>:
id: entry
canvas:
Color:
rgb: [.30,.50,.99]
Rectangle:
pos: self.pos
size: self.size
FloatLayout:
Camera:
id: camera
index: 0
resolution: (1280,720)
play: True
MDFillRoundFlatButton:
text: "take photo"
pos_hint: {'center_x': 0.50, 'center_y': .10}
on_press:
root.capture() #TAKE PHOTO
root.manager.transition.direction = 'up'
root.manager.transition.duration = 1
root.manager.current = 'screen_four'
MDIconButton:
icon: 'chevron-double-right'
pos_hint: {'center_x':.95, 'center_y':.10}
on_press:
root.manager.transition.direction = 'down'
root.manager.transition.duration = 1
root.manager.current = 'screen_two'
<ScreenFour@Screen>:
canvas:
Color:
rgb: [.30,.50,.99]
Rectangle:
pos: self.pos
size: self.size
FloatLayout:
# HERE I NEED TO DISPLAY THE IMAGE
MDIconButton:
icon: 'chevron-double-right'
pos_hint: {'center_x':.95, 'center_y':.10}
on_press:
root.manager.transition.direction = 'down'
root.manager.transition.duration = 1
root.manager.current = 'screen_three'
""")
class ScreenOne(Screen):
pass
class ScreenTwo(Screen):
theme_cls = ThemeManager()
theme_cls.primary_palette = 'Blue'
main_widget = None
class ScreenThree(Screen):
theme_cls = ThemeManager()
theme_cls.primary_palette = 'Blue'
main_widget = None
def capture(self):
camera = self.ids['camera']
timestr = time.strftime("%Y%m%d_%H%M%S")
photo = camera.export_to_png("IMG_{}.png".format(timestr))
print("Captured")
class ScreenFour(Screen):
pass
screen_manager = ScreenManager()
screen_manager.add_widget(ScreenOne(name="screen_one"))
screen_manager.add_widget(ScreenTwo(name="screen_two"))
screen_manager.add_widget(ScreenThree(name="screen_three"))
screen_manager.add_widget(ScreenFour(name="screen_four"))
class Interface(App):
def build(self):
return screen_manager
sample_app = Interface()
sample_app.run()
请告诉我，如何修改代码以完成任务。
错误
04-08 21:15:19.925 796 13801 E mm-camera: <STATS_AF ><ERROR> 959: af_spd_detect_process: ERROR! SPOT_LIGHT_FLAG =0!!! :AEC_grid = 256, BG_grid = 3072, ave luma = 0
04-08 21:15:19.933 835 902 W SurfaceFlinger: EventThread: dropping event (7673796e) for connection 0x7b332278c0
04-08 21:15:19.949 835 902 W SurfaceFlinger: EventThread: dropping event (7673796e) for connection 0x7b332278c0
04-08 21:15:19.959 796 13801 E mm-camera: <STATS_AF ><ERROR> 959: af_spd_detect_process: ERROR! SPOT_LIGHT_FLAG =0!!! :AEC_grid = 256, BG_grid = 3072, ave luma = 0
04-08 21:15:19.966 835 902 W SurfaceFlinger: EventThread: dropping event (7673796e) for connection 0x7b332278c0
04-08 21:15:19.983 835 902 W SurfaceFlinger: EventThread: dropping event (7673796e) for connection 0x7b332278c0
04-08 21:15:19.992 796 13801 E mm-camera: <STATS_AF ><ERROR> 959: af_spd_detect_process: ERROR! SPOT_LIGHT_FLAG =0!!! :AEC_grid = 256, BG_grid = 3072, ave luma = 0
04-08 21:15:19.999 835 902 W SurfaceFlinger: EventThread: dropping event (7673796e) for connection 0x7b332278c0
错误2
04-09 08:27:25.140 796 6243 E mm-camera: <STATS_AF ><ERROR> 959: af_spd_detect_process: ERROR! SPOT_LIGHT_FLAG =0!!! :AEC_grid = 256, BG_grid = 3072, ave luma = 0
04-09 08:27:25.146 835 902 W SurfaceFlinger: EventThread: dropping event (7673796e) for connection 0x7b32a54420
04-09 08:27:25.146 6164 6198 I python : Captured
04-09 08:27:25.147 6164 6198 I python : [ERROR ] [Image ] Error reading file IMG_20190409_082724.png
04-09 08:27:25.162 835 902 W SurfaceFlinger: EventThread: dropping event (7673796e) for connection 0x7b32a54420
04-09 08:27:25.175 796 6243 E mm-camera: <STATS_AF ><ERROR> 959: af_spd_detect_process: ERROR! SPOT_LIGHT_FLAG =0!!! :AEC_grid = 256, BG_grid = 3072, ave luma = 0
04-09 08:27:25.179 835 902 W SurfaceFlinger: EventThread: dropping event (7673796e) for connection 0x7b32a54420
解决方案
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.camera import Camera
from kivymd.theming import ThemeManager
import time
filename = ''
screenfour = ''
Builder.load_string("""
#:import MDFillRoundFlatButton kivymd.button.MDFillRoundFlatButton
#:import MDIconButton kivymd.button.MDIconButton
<ScreenOne@Screen>:
canvas:
Color:
rgb: [.30,.50,.99]
Rectangle:
pos: self.pos
size: self.size
FloatLayout:
MDFillRoundFlatButton:
color: [1,1,1,1]
text: "Перейти к созданию фото"
pos_hint: {'center_x':.50, 'center_y':.50}
on_press:
root.manager.transition.direction = 'up'
root.manager.transition.duration = 1
root.manager.current = 'screen_two'
<ScreenTwo@Screen>:
canvas:
Color:
rgb: [.30,.50,.99]
Rectangle:
pos: self.pos
size: self.size
FloatLayout:
MDFillRoundFlatButton:
color: [1,1,1,1]
text: "Выбрать фон"
pos_hint: {'center_x':.50, 'center_y':.10}
on_press:
root.manager.transition.direction = 'up'
root.manager.transition.duration = 1
root.manager.current = 'screen_three'
MDIconButton:
icon: 'chevron-double-right'
pos_hint: {'center_x':.95, 'center_y':.10}
on_press:
root.manager.transition.direction = 'down'
root.manager.transition.duration = 1
root.manager.current = 'screen_one'
<ScreenThree@Screen>:
id: entry
canvas:
Color:
rgb: [.30,.50,.99]
Rectangle:
pos: self.pos
size: self.size
FloatLayout:
Camera:
id: camera
index: 0
resolution: (1280,720)
play: True
MDFillRoundFlatButton:
text: "take photo"
pos_hint: {'center_x': 0.50, 'center_y': .10}
on_press:
root.capture() #TAKE PHOTO
root.manager.transition.direction = 'up'
root.manager.transition.duration = 1
root.manager.current = 'screen_four'
MDIconButton:
icon: 'chevron-double-right'
pos_hint: {'center_x':.95, 'center_y':.10}
on_press:
root.manager.transition.direction = 'down'
root.manager.transition.duration = 1
root.manager.current = 'screen_two'
<ScreenFour@Screen>:
canvas:
Color:
rgb: [.30,.50,.99]
Rectangle:
pos: self.pos
size: self.size
FloatLayout:
Image:
size: root.width, root.height
source: ''
id: imageWid
MDIconButton:
icon: 'chevron-double-right'
pos_hint: {'center_x':.95, 'center_y':.10}
on_press:
root.manager.transition.direction = 'down'
root.manager.transition.duration = 1
root.manager.current = 'screen_three'
""")
class ScreenOne(Screen):
pass
class ScreenTwo(Screen):
theme_cls = ThemeManager()
theme_cls.primary_palette = 'Blue'
main_widget = None
class ScreenThree(Screen):
theme_cls = ThemeManager()
theme_cls.primary_palette = 'Blue'
main_widget = None
def capture(self):
camera = self.ids['camera']
timestr = time.strftime("%Y%m%d_%H%M%S")
photo = camera.export_to_png("IMG_{}.png".format(timestr))
global filename, screenfour
filename = "IMG_{}.png".format(timestr)
print("Captured")
screenfour.update()
class ScreenFour(Screen):
def __init__(self, **kwargs):
super(ScreenFour, self).__init__(**kwargs)
global screenfour
screenfour = self
def update(self, *args):
global filename
imageWidget = self.ids['imageWid']
imageWidget.source = filename
screen_manager = ScreenManager()
screen_manager.add_widget(ScreenOne(name="screen_one"))
screen_manager.add_widget(ScreenTwo(name="screen_two"))
screen_manager.add_widget(ScreenThree(name="screen_three"))
screen_manager.add_widget(ScreenFour(name="screen_four"))
class Interface(App):
def build(self):
return screen_manager
sample_app = Interface()
sample_app.run()
您将创建一个global变量来保存图片的文件名，然后Image在 screenfour 中创建一个小部件，您Screen将在其中将 Image 小部件的源更新为您拍摄的图片的文件名。如果出现任何问题，请随时与我联系
推荐阅读
- python - 如何检查数据框中不同行之间的值变化并将其表示在新列中？
- javascript - 如何在列表中获取数组？使用 React.JS、Typescript
- airflow - 最后 RUN 列变化很快，不尊重 shedule_interval
- c++ - 尝试从 GitHub 编译 Sandboxie 时无法解析的外部符号
- php - 在 PHP 参数中调用表
- reactjs - 如何提交报告表单以便发送到 React Native 中的特定电子邮件
- python - 在字符串中删除超过 1 个句点 - Python
- java - maven 依赖项对于导入不可见
- python - 当格式特定时，如何使用 Python 逐行读取文本文件
- python - 有人可以解释这个 MySQL db Python 注入查询吗