Android单权限请求正常，多权限请求无UI弹窗问题求助

我正尝试按照官方文档向用户申请精确定位追踪权限。测试代码时发现，单权限请求可正常弹出授权UI，但申请多权限（ACCESS_FINE_LOCATION、ACCESS_COARSE_LOCATION、后台定位权限）时，授权UI完全不显示。两者代码几乎一致，具体多权限请求代码如下：

private fun requestPermissions() {
    val requestPermissionLauncher =
        registerForActivityResult(
            ActivityResultContracts.RequestMultiplePermissions()
        ) { granted ->
            Timber.tag("ASDASD").e(granted.toString())
            // 检查是否已授予精确或大致位置权限
        }

    if (TrackingUtility.hasLocationPermissions(requireContext())) {
        return
    }

    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
        requestPermissionLauncher.launch(
            arrayOf(
                Manifest.permission.ACCESS_FINE_LOCATION,
                Manifest.permission.ACCESS_COARSE_LOCATION
            )
        )
    } else {
        requestPermissionLauncher.launch(
            arrayOf(
                Manifest.permission.ACCESS_FINE_LOCATION,
                Manifest.permission.ACCESS_COARSE_LOCATION,
                Manifest.permission.ACCESS_BACKGROUND_LOCATION
            )
        )
    }
}

截图情况：

• 单权限请求正常显示授权UI
• 多权限请求无UI弹窗

我严格遵循文档操作，但只有使用SingleRequestPermission时才能正常工作，请问这是什么原因？

这个问题的核心原因是Android 10（API 29）及以上版本对后台定位权限的申请有严格的顺序要求：必须先获得前台定位权限（ACCESS_FINE_LOCATION或ACCESS_COARSE_LOCATION），才能申请后台定位权限ACCESS_BACKGROUND_LOCATION，不能将前台权限和后台权限放在同一次请求中批量申请。

具体修正步骤： #

1. 先发起前台定位权限（ACCESS_FINE_LOCATION+ACCESS_COARSE_LOCATION）的申请，确保用户授予其中至少一个。
2. 只有当前台权限已被授予后，再单独发起ACCESS_BACKGROUND_LOCATION权限的申请。

修改后的代码示例：

private val foregroundLocationLauncher = registerForActivityResult(
    ActivityResultContracts.RequestMultiplePermissions()
) { results ->
    val hasForegroundPermission = results.any { it.value }
    if (hasForegroundPermission) {
        // 前台权限已授予，申请后台定位权限
        requestBackgroundLocationPermission()
    }
}

private val backgroundLocationLauncher = registerForActivityResult(
    ActivityResultContracts.RequestPermission()
) { granted ->
    Timber.tag("ASDASD").e("后台定位权限是否授予：$granted")
}

private fun requestPermissions() {
    if (TrackingUtility.hasLocationPermissions(requireContext())) {
        return
    }

    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
        foregroundLocationLauncher.launch(
            arrayOf(
                Manifest.permission.ACCESS_FINE_LOCATION,
                Manifest.permission.ACCESS_COARSE_LOCATION
            )
        )
    } else {
        // 先检查前台权限是否已授予
        val hasForegroundPermission = ContextCompat.checkSelfPermission(
            requireContext(),
            Manifest.permission.ACCESS_FINE_LOCATION
        ) == PackageManager.PERMISSION_GRANTED ||
                ContextCompat.checkSelfPermission(
                    requireContext(),
                    Manifest.permission.ACCESS_COARSE_LOCATION
                ) == PackageManager.PERMISSION_GRANTED
        
        if (!hasForegroundPermission) {
            // 先申请前台权限
            foregroundLocationLauncher.launch(
                arrayOf(
                    Manifest.permission.ACCESS_FINE_LOCATION,
                    Manifest.permission.ACCESS_COARSE_LOCATION
                )
            )
        } else {
            // 直接申请后台权限
            requestBackgroundLocationPermission()
        }
    }
}

private fun requestBackgroundLocationPermission() {
    backgroundLocationLauncher.launch(Manifest.permission.ACCESS_BACKGROUND_LOCATION)
}

额外注意事项： #

• 必须在AndroidManifest.xml中声明所有需要的权限：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" android:maxSdkVersion="32" />
<!-- Android 13+ 需单独申请POST_NOTIFICATIONS权限才能使用后台定位 -->
<uses-permission android:name="android.permission.POST_NOTIFICATIONS" />

• Android 13（API 33）及以上版本，后台定位权限还依赖POST_NOTIFICATIONS权限，需要先授予通知权限才能申请后台定位。

内容的提问来源于stack exchange，提问作者isilvani