DialogSamplesMedium.kt

//Part of Functions.kt, this and below 3 functions helps to create dialog.
public fun Context.showDialog(cancelable: Boolean = false, cancelableTouchOutside: Boolean = false, builderFunction: AlertDialog.Builder.() -> Any) {
    val builder = AlertDialog.Builder(this)
    builder.builderFunction()
    val dialog = builder.create();

    dialog.setCancelable(cancelable)
    dialog.setCanceledOnTouchOutside(cancelableTouchOutside)
    dialog.show()
}


public fun AlertDialog.Builder.positiveButton(text: String = "OK", handleClick: (i: Int) -> Unit = {}) {
    this.setPositiveButton(text, { dialogInterface, i -> handleClick(i) })
}

public fun AlertDialog.Builder.negativeButton(text: String = "CANCEL", handleClick: (i: Int) -> Unit = {}) {
    this.setNegativeButton(text, { dialogInterface, i -> handleClick(i) })
}

public fun AlertDialog.Builder.neutralButton(text: String, handleClick: (i: Int) -> Unit = {}) {
    this.setNeutralButton(text, { dialogInterface, i -> handleClick(i) })
}


//Sample of this code in MainActivityViewModel
activity.showDialog {
    setTitle("Pick Path")
    positiveButton("Pick Files", { pickPathToRead() })
    negativeButton()
}