Solution 1
You can disable activity and show/hide a ProgressBar.
Solution 2: Dialog
The inconvinience with Solution 1 is that you always need to embeded ProgressBar into the current layout.
This solution will use a DialogFragment to display the ProgressBar.
- Dialog comes with white inner background and black outer overlay with opacity, and prevent user from touching the activity.
- Make the white background transparent
- Remove outer black overlay of fragment
- Prevent dialog dismiss by user touch
class BusyDialogFragment: DialogFragment() { companion object { private const val FRAGMENT_TAG = "busy" fun newInstance() = BusyDialogFragment() fun show(supportFragmentManager: FragmentManager): BusyDialogFragment { val dialog = BusyDialogFragment.newInstance() // prevent dismiss by user click dialog.isCancelable = false dialog.show(supportFragmentManager, FRAGMENT_TAG) return dialog } } override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { // return super.onCreateView(inflater, container, savedInstanceState) // make white background transparent dialog?.window?.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT)) return activity!!.layoutInflater.inflate(R.layout.busy, container) } override fun onStart() { super.onStart() // remove black outer overlay, or change opacity dialog?.window?.also { window -> window.attributes?.also { attributes -> attributes.dimAmount = 0.1f window.attributes = attributes } } }}Layout
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ProgressBar
android:layout_centerInParent="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>Usage: Show dialog
val busyDialog = BusyDialogFragment.show(supportFragmentManager)Hide dialog
busyDialog.dismiss()Use function reference to automatically show and dismiss dialog
class BusyDialog: DialogFragment() { companion object { ... fun <R> show(fragmentManager: FragmentManager, block: () -> R): R { val dialog = show(fragmentManager) return block().apply { dialog.dismiss() } } }Usage
val result = BusyDialog.show(fragmentManager!!) { // do something}