How to handle android runtime permission with kivy

Question

I found that kivy is very nice framework to build cross platform application and I am very interested in kivy just to do android application as I think is easy and comfortable in kivy.

After trying few examples, I am interested to know how should handle android run time permission for the kivy app.

Actually I had searched on google, but no single working example out there. Should I go back to android / java or it possible with kivy and some other python libs.

Philipp Auersperg · Answer 1 · 2018-11-30T10:58:13.627

pyjnius is the way to go. You have to port these instructions using pyjnius. This involves the following steps:

Unfortunately the api call to ContextCompat.checkSelfPermission is implemented in the android sdk support library which has to be downloaded seperately, so get the .aar with the version best matching your android API level for example here.
copy it into your project dir and reference it from your buildozer.spec:
```
android.add_aars = support-v4-26.0.0-alpha1.aar  
```
make sure jinius is in the requirements in buildozer.spec
use the following code snippet

Note: this is a blocking function which waits until the permissions dialog is answered. If the app already has the permission the function returns immediately. So for example if you want to get the permissions for writing to the SD card and for the camera, which are both "dangerous permissions", call:

perms = ["android.permission.READ_EXTERNAL_STORAGE",
         "android.permission.WRITE_EXTERNAL_STORAGE",
         "android.permission.CAMERA"]

haveperms = acquire_permissions(perms)

And here the function for acquiring the permissions:

import time
import functools
import jnius

def acquire_permissions(permissions, timeout=30):
    """
    blocking function for acquiring storage permission

    :param permissions: list of permission strings , e.g. ["android.permission.READ_EXTERNAL_STORAGE",]
    :param timeout: timeout in seconds
    :return: True if all permissions are granted
    """

    PythonActivity = jnius.autoclass('org.kivy.android.PythonActivity')
    Compat = jnius.autoclass('android.support.v4.content.ContextCompat')
    currentActivity = jnius.cast('android.app.Activity', PythonActivity.mActivity)

    checkperm = functools.partial(Compat.checkSelfPermission, currentActivity)

    def allgranted(permissions):
        """
        helper function checks permissions
        :param permissions: list of permission strings
        :return: True if all permissions are granted otherwise False
        """
        return reduce(lambda a, b: a and b,
                    [True if p == 0 else False for p in map(checkperm, permissions)]
                    )

    haveperms = allgranted(permissions)
    if haveperms:
        # we have the permission and are ready
        return True

    # invoke the permissions dialog
    currentActivity.requestPermissions(permissions, 0)

    # now poll for the permission (UGLY but we cant use android Activity's onRequestPermissionsResult)
    t0 = time.time()
    while time.time() - t0 < timeout and not haveperms:
        # in the poll loop we could add a short sleep for performance issues?
        haveperms = allgranted(permissions)

    return haveperms

Probably the cleanest way would be to pimp p4a's PythonActivity.java to do that but this one does it for me for now.

Hey, I am trying to run a simple video from storage in Kivy Python Android using Buildozer and while the Camera works the Video loads only black. Do you know why that is? I came across your answer because I was thinking it's a permission issue. Here is my SO question https://stackoverflow.com/questions/65042155/how-to-video-stream-using-kivy-for-android. But since the camera loads maybe it's something else. Thanks! — Q2Learn, Nov 27 '20 at 19:15

score 2 · Answer 2 · answered Dec 23 '19 at 03:44

Hi this question is old but you can use

request_permissions([Permission.WRITE_EXTERNAL_STORAGE])
#For requesting permission you can pass a list with all the permissions you need

check_permission('android.permission.WRITE_EXTERNAL_STORAGE')
#returns True if you have the permission

you can check: python-for-android example

you can check the code and the list of permission you can use with this method: python-for-android code

score 1 · Answer 3 · answered Nov 28 '17 at 01:16

1

python-for-android doesn't have any code for handling runtime permissions. I expect to look at it sooner rather than later, but there's no ETA for it.

You can probably add the code for it yourself if you're interested and know how. If you'd like to try it, such contributions would be very welcome.

answered Nov 28 '17 at 01:16

inclement

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Anything that give a little direction would be very helpful as you know I am new to this Kivy android or python-for-android thing. – Natwar Singh Nov 29 '17 at 11:15

score 1 · Answer 4 · answered Aug 14 '20 at 17:24

1

i know this answer is a little late, but to get permissions you have to specify them before the build. E.g buildozer uses a buildozer.spec. In this file you can specify the permissions you need.

answered Aug 14 '20 at 17:24

RVLTN72

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How to handle android runtime permission with kivy

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