android - 如何使用 Jetpack Compose 请求权限？

Question

应该如何实现从 Jetpack Compose View 请求权限？我正在尝试使用 Jetpack Compose 实现应用程序访问相机。我尝试了 How to get Current state or context in Jetpack Compose 中的示例不幸的是，示例不再适用于 dev06。

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

Answer 1

如compose_version = '1.0.0-beta04'和

implementation 'androidx.activity:activity-compose:1.3.0-alpha06'

您可以像这样简单地请求权限:

@Composable
fun ExampleScreen() {
    val launcher = rememberLauncherForActivityResult(
        ActivityResultContracts.RequestPermission()
    ) { isGranted: Boolean ->
        if (isGranted) {
            // Permission Accepted: Do something
            Log.d("ExampleScreen","PERMISSION GRANTED")

        } else {
            // Permission Denied: Do something
            Log.d("ExampleScreen","PERMISSION DENIED")
        }
    }
    val context = LocalContext.current

    Button(
        onClick = {
            // Check permission
            when (PackageManager.PERMISSION_GRANTED) {
                ContextCompat.checkSelfPermission(
                    context,
                    Manifest.permission.READ_EXTERNAL_STORAGE
                ) -> {
                    // Some works that require permission
                    Log.d("ExampleScreen","Code requires permission")
                }
                else -> {
                    // Asking for permission
                    launcher.launch(Manifest.permission.READ_EXTERNAL_STORAGE)
                }
            }
        }
    ) {
        Text(text = "Check and Request Permission")
    }
}