如何使用 kivy 处理 android 运行时权限

确保 jinius 符合 buildozer.spec 中的要求

make sure jinius is in the requirements in buildozer.spec

使用以下代码片段

注意:这是一个阻塞功能，它会等待权限对话框得到答复.如果应用程序已经拥有权限，该函数会立即返回.因此，例如，如果您想获得写入 SD 卡和相机的权限，这都是危险权限"，请调用:

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)

这里是获取权限的函数:

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

可能最干净的方法是拉皮条 p4a 的 PythonActivity.java 来做到这一点，但现在这个是为我做的.

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

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