android ，Is there a tutorial on how to call cameras and albums.

[jlij]

I want to call the camera by clicking on the DetailedList，And assign the element information to the photo name。

[freakboy3742]

Unfortunately, we don't have a tutorial for this. We don't currently have a cross-platform API for these features; to implement them, you need to write code against the native platform APIs for camera access, etc. You'll need to combine the documentation for Chaquopy layer with Android's own platform documentation for camera and album access.

[jlij]

Prompt after startup:The Camera API is not implemented on this platform,
Click on Take photo:NotImplementedError: Toga's Winforms backend doesn't implement Camera.
How can I solve this problem?

[freakboy3742]

The error message isn't a cryptic puzzle. It's telling you the exact problem. The Camera API hasn't been implemented for Windows.

The platform support chart for the Camera API also says this, as does my reply telling you that the Camera API is available:

Yes - a Camera API was added added in Toga 0.4.2, with support for iOS, Android and macOS.

If you want to use the camera on Windows, you'll need to either implement the Toga API for Windows, or find a third-party library that can access the camera.

[jlij]

Do I need to define it in pyproject.toml? Is it okay to write it like this? Permission. camera="android. permission. CAMERA"

[freakboy3742]

This isn't a case of you doing something wrong. It doesn't require a 1 line configuration change. The feature does not exist. Toga does not contain an implementation of the Camera API on Windows or Linux. At present, you can only use the Camera API on macOS, iOS and Android. The "fix" is for someone to implement the entire Camera API for Winforms and GTK.

[jlij]

How to solve problems encountered in the Android environment?

--------- beginning of crash
E/AndroidRuntime: FATAL EXCEPTION: main
E/AndroidRuntime: Process: com.example.helloworld, PID: 29938
E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.helloworld/org.beeware.android.MainActivity}: com.chaquo.python.PyException: AttributeError: 'ExampleHardwareApp' object has no attribute 'camera'
E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3303)
E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3411)
E/AndroidRuntime: at android.app.ActivityThread.-wrap12(Unknown Source:0)
E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1994)
E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:108)
E/AndroidRuntime: at android.os.Looper.loop(Looper.java:166)
E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:7529)
E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime: at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:245)
E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:921)
E/AndroidRuntime: Caused by: com.chaquo.python.PyException: AttributeError: 'ExampleHardwareApp' object has no attribute 'camera'
E/AndroidRuntime: at .helloworld.app.startup(app.py:11)
E/AndroidRuntime: at .toga_android.app.create(app.py:175)
E/AndroidRuntime: at .toga_android.app.main_loop(app.py:186)
E/AndroidRuntime: at .toga.app.main_loop(app.py:517)
E/AndroidRuntime: at .main.(main.py:4)
E/AndroidRuntime: at .runpy._run_code(:88)
E/AndroidRuntime: at .runpy._run_module_code(:98)
E/AndroidRuntime: at .runpy.run_module(:226)
E/AndroidRuntime: at .chaquopy_java.call(chaquopy_java.pyx:354)
E/AndroidRuntime: at .chaquopy_java.Java_com_chaquo_python_PyObject_callAttrThrowsNative(chaquopy_java.pyx:326)
E/AndroidRuntime: at com.chaquo.python.PyObject.callAttrThrowsNative(Native Method)
E/AndroidRuntime: at com.chaquo.python.PyObject.callAttrThrows(PyObject.java:232)
E/AndroidRuntime: at com.chaquo.python.PyObject.callAttr(PyObject.java:221)
E/AndroidRuntime: at org.beeware.android.MainActivity.onCreate(MainActivity.java:85)
E/AndroidRuntime: at android.app.Activity.performCreate(Activity.java:7383)
E/AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1218)
E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3256)
E/AndroidRuntime: ... 9 more
I/Process : Sending signal. PID: 29938 SIG: 9

[freakboy3742]

That stack trace indicates you're not using Toga 0.4.2. You've either not updated your pyproject.toml, or you haven't run briefcase update android -r to update dependencies.

[freakboy3742]

I can't see anything obviously wrong there - as far as I can tell, it's the default Briefcase output for a HelloWorld app that declares a photo permission. If you're getting an error that says it can't find a FileProvider, it suggests that the version of the app you're running hasn't been recompiled - it's using the old version. To be completely sure, manually delete the app from your phone, then run briefcase run android to re-install it.

[jlij]

You are right, it did appear.
W/python.stderr: java.lang.IllegalArgumentException: Couldn't find meta-data for provider with authority org.beeware.examples.hardware.fileprovider

I have recompiled according to your method, but it did not work。

[jlij]

briefcase run android Subsequent prompts

E/vndksupport: Could not load vendor/lib64/egl/libGLES_mali.so from sphal namespace: dlopen failed: library "vendor/lib64/egl/libGLES_mali.so" not found.

I/PressGestureDetector: onAttached end
I/PressGestureDetector: enabledInPad = false,isPcCastMode = false
I/Adreno : QUALCOMM build : cf751ce, Ia11ce2d146
I/Adreno : Build Date : 12/22/20
I/Adreno : OpenGL ES Shader Compiler Version: EV031.20.00.04
I/Adreno : Local Branch :
I/Adreno : Remote Branch : refs/tags/AU_LINUX_ANDROID_LA.UM.6.5.R1.08.00.00.312.030
I/Adreno : Remote Branch : NONE
I/Adreno : Reconstruct Branch : NOTHING
I/Adreno : PFP: 0x005ff087, ME: 0x005ff063
I/OpenGLRenderer: Initialized EGL, version 1.4
D/OpenGLRenderer: Swap behavior 2
E/vndksupport: Could not load vendor/lib64/egl/libGLES_mali.so from sphal namespace: dlopen failed: library "vendor/lib64/egl/libGLES_mali.so" not found.
D/OpenGLRenderer: HWUI Binary is disabled
D/MainActivity: onPrepareOptionsMenu() start
D/MainActivity: onPrepareOptionsMenu() complete
W/InputMethodManager: startInputReason = 1
W/InputMethodManager: startInputReason = 5
I/HwApiCacheMangerEx: apicache pi PackageInfo{6fb42a2 com.example.helloworld}
D/ProfileInstaller: Installing profile for com.example.helloworld
read: unexpected EOF!

[freakboy3742]

If you're a Briefcase generated app template that generated the configuration files you provided earlier, you can't be getting that error. The error message talks about org.beeware.examples.hardware.fileprovider; your application is com.example.helloworld.

I strongly suspect you've copy-and-pasted some code from the Hardware example - most likely the code that sets the app's bundle ID. If you correct the bundle ID and rebuild, it should find the correct file provider.

[jlij]

Thank you very much. After deleting the entire project and rebuilding it, we will solve it perfectly according to the instructions you provided.