How to use PermissionX to request permissions in an Android Kotlin app? - Stack Overflow

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I am building an Android app using Kotlin and want to use the PermissionX library to request runtime permissions from users.

I have already added the library to my project and followed the documentation, but I'm not sure how to properly implement it to request permissions such as READ_EXTERNAL_STORAGE and CAMERA.

Here is what I have tried so far:

PermissionX.init(this)
    .permissions(android.Manifest.permission.READ_EXTERNAL_STORAGE, android.Manifest.permission.CAMERA)
    .onExplainRequestReason { scope, deniedList ->
        scope.showRequestReasonDialog(
            deniedList,
            "The app needs these permissions to work properly. Please grant them.",
            "OK",
            "Cancel"
        )
    }
    .onForwardToSettings { scope, deniedList ->
        scope.showForwardToSettingsDialog(
            deniedList,
            "You need to allow these permissions in settings manually.",
            "OK",
            "Cancel"
        )
    }
    .request { allGranted, grantedList, deniedList ->
        if (allGranted) {
            Toast.makeText(this, "All permissions are granted", Toast.LENGTH_SHORT).show()
        } else {
            Toast.makeText(this, "These permissions are denied: $deniedList", Toast.LENGTH_SHORT).show()
        }
    }

However, when I run the app, I encounter the following issue:

The permission request dialog sometimes does not appear, and the app behaves as if the permissions were denied, even though I haven't interacted with the dialog.

I would like to know:

1. Is this the correct way to use PermissionX for requesting permissions?
2. How can I ensure the permissions are requested and handled properly, even if the user denies or grants them selectively? Any guidance or corrections to my code would be greatly appreciated.

I am building an Android app using Kotlin and want to use the PermissionX library to request runtime permissions from users.

I have already added the library to my project and followed the documentation, but I'm not sure how to properly implement it to request permissions such as READ_EXTERNAL_STORAGE and CAMERA.

Here is what I have tried so far:

PermissionX.init(this)
    .permissions(android.Manifest.permission.READ_EXTERNAL_STORAGE, android.Manifest.permission.CAMERA)
    .onExplainRequestReason { scope, deniedList ->
        scope.showRequestReasonDialog(
            deniedList,
            "The app needs these permissions to work properly. Please grant them.",
            "OK",
            "Cancel"
        )
    }
    .onForwardToSettings { scope, deniedList ->
        scope.showForwardToSettingsDialog(
            deniedList,
            "You need to allow these permissions in settings manually.",
            "OK",
            "Cancel"
        )
    }
    .request { allGranted, grantedList, deniedList ->
        if (allGranted) {
            Toast.makeText(this, "All permissions are granted", Toast.LENGTH_SHORT).show()
        } else {
            Toast.makeText(this, "These permissions are denied: $deniedList", Toast.LENGTH_SHORT).show()
        }
    }

However, when I run the app, I encounter the following issue:

The permission request dialog sometimes does not appear, and the app behaves as if the permissions were denied, even though I haven't interacted with the dialog.

I would like to know:

1. Is this the correct way to use PermissionX for requesting permissions?
2. How can I ensure the permissions are requested and handled properly, even if the user denies or grants them selectively? Any guidance or corrections to my code would be greatly appreciated.

• android
• kotlin
• permissions
• runtime-permissions

Share Improve this question Follow asked Nov 21, 2024 at 12:22 Lily MontaLily Monta 2144 bronze badges 1

• The problem is probably because starting from API level 33, READ_EXTERNAL_STORAGE has no effect, causing allGranted to return false – Crebain Commented Nov 21, 2024 at 12:44

Add a comment  | 

1 Answer 1

Sorted by: Reset to default 0

I believe I have the right answer to the query.

This is how permissionX should be implemented in Android.

 fun requestPermissionIfNeeded(permissions: List<String>, requestCallback: RequestCallback?) {
        var allGranted = true
        for (permission in permissions) {
            if (ContextCompat.checkSelfPermission(
                    this, permission!!
                ) != PackageManager.PERMISSION_GRANTED
            ) {
                allGranted = false
            }
        }
        if (allGranted) {
            requestCallback!!.onResult(true, permissions, ArrayList())
            return
        }

        PermissionX.init(this).permissions(permissions)
            .onExplainRequestReason(ExplainReasonCallback { scope: ExplainScope, deniedList: List<String> ->
                var message = ""
                if (permissions.size == 1) {
                    if (deniedList.contains(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
                        message = this.getString(R.string.permission_explain)
                    }
                } else {
                    if (deniedList.size == 1) {
                        if (deniedList.contains(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
                            message = this.getString(R.string.permission_explain)
                        }
                    } else {
                        message = this.getString(R.string.permission_explain)
                    }
                }
                scope.showRequestReasonDialog(deniedList, message, getString(R.string.ok))
            })
            .onForwardToSettings(ForwardToSettingsCallback { scope: ForwardScope, deniedList: List<String> ->
                var message = ""
                if (permissions.size == 1) {
                    if (deniedList.contains(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
                        message = this.getString(R.string.permission_explain)
                    }
                } else {
                    if (deniedList.size == 1) {
                        if (deniedList.contains(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
                            message = this.getString(R.string.permission_explain)
                        }
                    } else {
                        message = this.getString(R.string.permission_explain)
                    }
                }
                scope.showForwardToSettingsDialog(
                    deniedList, message, getString(R.string.settings), getString(R.string.cancel)
                )
            }).request(RequestCallback { allGranted, grantedList, deniedList ->
                requestCallback?.onResult(
                    allGranted, grantedList, deniedList
                )
            })
    }

You can put this into practice as follows:

    val strings = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
                    listOf(Manifest.permission.READ_MEDIA_IMAGES)     // For 10+
                } else {
                    listOf(Manifest.permission.READ_EXTERNAL_STORAGE)    // For below 10
                }

requestPermissionIfNeeded(strings) { allGranted, grantedList, deniedList ->
                    if (allGranted) {
                        val i = Intent(
                            Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI
                        )
                        startActivityForResult(
                            i, GALLERY_CODE
                        )
                    }
                }

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