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Utility class for handling permissions on Android
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class BaseActivity : Activity { | |
val permissionHandler: PermissionRequestHandler | |
override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) { | |
val handled = permissionHandler.onRequestPermissionsResult(requestCode, permissions, grantResults) | |
if(!handled) { | |
super.onRequestPermissionsResult(requestCode, permissions, grantResults) | |
} | |
} | |
} |
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class PermissionRequestHandler(val activity: Activity) { | |
val permissionCallbacks = mutableMapOf<Int, PermissionCallbacks>() | |
val requestCodes = generateSequence(0) { it + 1 }.iterator() | |
data class PermissionCallbacks(val onGranted: () -> Unit, | |
val onDenied: (() -> Unit)? = null) | |
fun needPermission( | |
permission: String, | |
beforeRequest: (() -> Unit)? = null, | |
onDenied: (() -> Unit)? = null, | |
onGranted: () -> Unit | |
) { | |
if(hasPermission(permission)) { | |
onGranted() | |
} else { | |
beforeRequest?.invoke() | |
val requestCode = requestCodes.next() | |
permissionCallbacks[requestCode] = PermissionCallbacks(onGranted, onDenied) | |
ActivityCompat.requestPermissions(activity, arrayOf(permission), requestCode) | |
} | |
} | |
fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, | |
grantResults: IntArray): Boolean { | |
val (onGranted, onDenied) = permissionCallbacks[requestCode] | |
?: return false | |
if(grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) { | |
onGranted() | |
} else { | |
onDenied?.invoke() | |
} | |
return true | |
} | |
fun hasPermission(perm: String) = activity.hasPermission(perm) | |
} | |
fun Context.hasPermission(perm: String): Boolean = | |
ContextCompat.checkSelfPermission(this, perm) == PackageManager.PERMISSION_GRANTED |
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