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How to handle permission results in Kotlin Android

How to handle permission results in Kotlin Android.

Here's a step-by-step tutorial on how to handle permission results in Kotlin for Android:

Step 1: Declare Permissions in Manifest

In your AndroidManifest.xml file, declare the permissions that your app requires. For example, if your app needs to access the camera, add the following line inside the <manifest> tag:

<uses-permission android:name="android.permission.CAMERA" />

Step 2: Check Permission Status

Before requesting a permission, you need to check if it has already been granted or not. To do this, you can use the ContextCompat.checkSelfPermission() method. For example, to check if the camera permission is granted, use the following code:

if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
// Permission is granted
} else {
// Permission is not granted
}

Step 3: Request Permission

If the permission has not been granted, you need to request it from the user. This can be done using the ActivityCompat.requestPermissions() method. Pass an array of permissions you want to request along with a unique request code. For example, to request the camera permission, use the following code:

ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.CAMERA), REQUEST_CAMERA_PERMISSION)

Step 4: Handle Permission Result

After requesting the permission, the user will be presented with a system dialog to grant or deny the permission. The result of the user's decision will be received in the onRequestPermissionsResult() method of your activity or fragment. Override this method to handle the permission result. For example:

override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
when (requestCode) {
REQUEST_CAMERA_PERMISSION -> {
if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Permission is granted
} else {
// Permission is denied
}
}
}
}

Step 5: Handle Permission Rationale

If the user denies the permission, they may be shown a rationale explaining why the permission is needed. You can handle this by checking the shouldShowRequestPermissionRationale() method. For example:

if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) {
// Show rationale to the user and explain why the permission is needed
} else {
// Permission is denied permanently, take appropriate action
}

Step 6: Handle Permission Denied Permanently

If the user selects "Don't ask again" when denying the permission, the permission is denied permanently. In this case, you can direct the user to the app settings screen to manually enable the permission. Use the following code to open the app settings screen:

val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
val uri = Uri.fromParts("package", packageName, null)
intent.data = uri
startActivity(intent)

That's it! You've now learned how to handle permission results in Kotlin for Android. Make sure to handle permission results correctly to provide a good user experience in your app.