Jetpack Compose如何请求权限？

173

马特乌斯·克劳祖克（Mateusz Krawczuk）

如何实现从Jetpack Compose View请求权限的方法？我正在尝试使用Jetpack Compose实现访问Camera的应用程序。我尝试了如何从Jetpack Compose中获取当前状态或上下文中的示例，不幸的是该示例不再与dev06一起使用。

        fun hasPermissions(context: Context) = PERMISSIONS_REQUIRED.all {
            ContextCompat.checkSelfPermission(context, it) == PackageManager.PERMISSION_GRANTED
        }
    }
}

2月222

有点晚了，但这可能会有所帮助，因为我今天遇到了问题：

有了ContextAmbient.current它不能保证你有一个活动或片段因此，我创建了自己的环境处理权限。

val AmbientPermissionHandler: ProvidableAmbient<PermissionHandler> =
    ambientOf { throw IllegalStateException("permission handler is not initialized") }

// Activity:
private val permissionHandler = PermissionHandler(this)
// onCreate:
setContent {
    Providers(
        AmbientPermissionHandler provides permissionHandler
    ) {/* Composable Contnent */}

用法：

@Composable
fun PermissionHandler(
    permissions: Array<out String>,
    requestCode: Int,
    granted: @Composable() () -> Unit,
    denied: @Composable() () -> Unit,
    deniedPermanently: (@Composable() () -> Unit)? = null,
    rational: (@Composable() () -> Unit)? = null,
    awaitResult: (@Composable() () -> Unit)? = null,
) {
    val permissionHandler = AmbientPermissionHandler.current
    val (permissionResult, setPermissionResult) = remember(permissions) { mutableStateOf<PermissionResult?>(null) }
    launchInComposition {
        setPermissionResult(permissionHandler.requestPermissionsSuspend(requestCode, permissions))
    }
    when (permissionResult) {
        is PermissionResult.PermissionGranted -> granted()
        is PermissionResult.PermissionDenied -> denied()
        is PermissionResult.PermissionDeniedPermanently -> deniedPermanently?.invoke()
        is PermissionResult.ShowRational -> rational?.invoke()
        null -> awaitResult?.invoke()
    }
}

具有依赖项的PermissionHandler的实现https://github.com/sagar-viradiya/eazypermissions

class PermissionHandler(
    private val actualHandler: AppCompatActivity,
) {
    suspend fun requestPermissionsSuspend(requestCode: Int, permissions: Array<out String>): PermissionResult {
        return PermissionManager.requestPermissions(actualHandler, requestCode, *permissions)
    }

    fun requestPermissionsWithCallback(requestCode: Int, permissions: Array<out String>, onResult: (PermissionResult) -> Unit) {
        actualHandler.lifecycleScope.launch {
            onResult.invoke(PermissionManager.requestPermissions(actualHandler, requestCode, *permissions))
        }
    }
}

如果您更喜欢回调，那么第二个函数也可以工作。

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