Accompanist权限库：两次拒权后launchPermissionRequest无响应问题咨询

关于无限请求权限 #

Android系统层面有明确限制：当用户**两次拒绝权限并勾选“不再询问”**后，系统会阻止应用再次弹出权限请求弹窗，这是系统的用户保护机制，所有权限框架（包括你使用的Accompanist）都无法绕过这个限制实现无限次请求。

判断launchPermissionRequest()是否能触发弹窗 #

可以通过cameraPermissionState.status.shouldShowRationale状态来判断：

• 当shouldShowRationale为true：调用launchPermissionRequest()会正常弹出系统权限请求框
• 当shouldShowRationale为false：此时要么是首次请求权限，要么是用户已经勾选“不再询问”拒绝了权限。这种情况下调用launchPermissionRequest()不会弹框，建议引导用户跳转到应用设置页手动开启权限。

优化后的示例代码 #

@OptIn(ExperimentalPermissionsApi::class)
@Composable
private fun FeatureThatRequiresCameraPermission() {
    val cameraPermissionState = rememberPermissionState(
        android.Manifest.permission.CAMERA
    )
    val context = LocalContext.current

    if (cameraPermissionState.status.isGranted) {
        Text("Camera permission Granted")
    } else {
        Column {
            val textToShow = when {
                cameraPermissionState.status.shouldShowRationale -> {
                    "相机权限对本功能很重要，请授予权限。"
                }
                !cameraPermissionState.status.shouldShowRationale && 
                cameraPermissionState.status is PermissionStatus.Denied -> {
                    "相机权限已被拒绝且无法自动请求，请前往应用设置手动开启。"
                }
                else -> {
                    "本功能需要相机权限，请授予权限。"
                }
            }
            Text(textToShow)

            Button(
                onClick = {
                    if (cameraPermissionState.status.shouldShowRationale) {
                        cameraPermissionState.launchPermissionRequest()
                    } else if (cameraPermissionState.status is PermissionStatus.Denied) {
                        // 跳转到应用设置页
                        val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS).apply {
                            data = Uri.fromParts("package", context.packageName, null)
                        }
                        context.startActivity(intent)
                    } else {
                        cameraPermissionState.launchPermissionRequest()
                    }
                }
            ) {
                Text(
                    if (cameraPermissionState.status is PermissionStatus.Denied && 
                        !cameraPermissionState.status.shouldShowRationale) {
                        "前往设置开启"
                    } else {
                        "请求权限"
                    }
                )
            }
        }
    }
}

内容的提问来源于stack exchange，提问作者sadat