permissions

gistfile1.kt

// Ask for permission to read storage
if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
    != PackageManager.PERMISSION_GRANTED) {
  if (ActivityCompat.shouldShowRequestPermissionRationale(this,
      Manifest.permission.READ_EXTERNAL_STORAGE)) {
    // This will happen if the user previously denied the permission
      requestPermissions()
  } else {
    // We need to check if it's the first time we ask because
    // shouldShowRequestPermissionRationale returns false in that case. 
    // We set a boolean (shared prefs for example) to store if we are asking for the first time or not
    if (isFirstTimeAskingPermission(Manifest.permission.READ_EXTERNAL_STORAGE)) {
      firstTimeAskingPermission(Manifest.permission.READ_EXTERNAL_STORAGE, false)
      // No explanation needed, we can request the permission.
      requestPermissions()
    } else {
      // Permission disable by device policy or user denied permanently. Show dialog to
      // redirect to application settings
      showDialogToNavigateToApplicationSettings()
    }
  }
}