Compose - 权限申请

官方介绍

一、概念

二、使用 Accompanist Permissions

官方介绍

不同版本中，权限状态（如PermissionState）中获取属性的方法不同，例如在"0.23.1"中，通过 PermissionState.hasPermission 属性拿到是否通过的 Boolean 值，在"0.35.0-alpha"中，通过 PermissionState.status.isGranted 属性拿到。

|------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| | 单个权限 | 多个权限 |
| 添加权限 | @Composable fun rememberPermissionState( permission: String ): PermissionState | @Composable fun rememberMultiplePermissionsState( permissions: List<String> ): MultiplePermissionsState |
| 发起请求 | fun launchPermissionRequest(): Unit | fun launchMultiplePermissionRequest(): Unit |
| 权限回调 | @Composable fun PermissionRequired( permissionState: PermissionState, permissionNotGrantedContent: @Composable (() -> Unit), permissionNotAvailableContent: @Composable (() -> Unit), content: @Composable (() -> Unit), ) | @Composable fun PermissionsRequired( multiplePermissionsState: MultiplePermissionsState, permissionsNotGrantedContent: @Composable (() -> Unit), permissionsNotAvailableContent: @Composable (() -> Unit), content: @Composable (() -> Unit), ) |

2.1 添加依赖

implementation "com.google.accompanist:accompanist-permissions:0.35.1-alpha"

2.2 单个权限申请

val permissionState = rememberPermissionState(
    Manifest.permission.CAMERA
)

PermissionRequired(
    permissionState = permissionState,
    permissionNotGrantedContent = {    //还未申请或点击了拒绝
        Button(onClick = { permissionState.launchPermissionRequest() }) {
            Text("点击申请")
        }
    },
    permissionNotAvailableContent = {    //点击了不再询问
        Text("无权限")
    }
) {    //点击了通过
    Text("已授予")
}

2.3 多个权限申请

val permissionState = rememberMultiplePermissionsState(
    listOf(
        Manifest.permission.CAMERA,
        Manifest.permission.READ_EXTERNAL_STORAGE,
        Manifest.permission.WRITE_EXTERNAL_STORAGE,
        Manifest.permission.RECORD_AUDIO
    )
)

LaunchedEffect(Unit) {
    permissionState.launchMultiplePermissionRequest()
}

三、使用 rememberLauncherForActivityResult