Android Show Busy/Loading and Prevent Touch (using DialogFragment) - Kotlin

April 13, 2019

Dialog with transparent background and disable black opacity

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
}

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