Utilite class that makes restore fragment dialog state little easier

a_example.md

Example

`

private lateinit var dialogFragmentRunner: DialogFragmentRunnerKt<YourFragment>

//in onCreate()  {
    val fragmentManager = getFragmentManager()
    dialogFragmentRunner = DialogFragmentRunner(  
        fragmentManager ,  
        YOUR_FRAGMENT_TAG
    ) {    
       //fragment initialization code
           setOnCompleteListener()//blahblah blah  
      }
}

fun showDialog() {
    val dialogFragment = //create dialog fragment  
    dialogFragmentRunner.show(dialogFragment)
}

`

DialogFragmentRunner.java

public class DialogFragmentRunner<T extends DialogFragment> {

    private final FragmentManager fragmentManager;
    private final String tag;
    private final Callback<T> fragmentInitializer;

    public DialogFragmentRunner(FragmentManager fragmentManager,
                                String tag,
                                Callback<T> fragmentInitializer) {
        this.fragmentManager = fragmentManager;
        this.tag = tag;
        this.fragmentInitializer = fragmentInitializer;

        @SuppressWarnings("unchecked")
        T fragment = (T) fragmentManager.findFragmentByTag(tag);
        if (fragment != null) {
            fragmentInitializer.call(fragment);
        }
    }

    public void show(T fragment) {
        fragmentInitializer.call(fragment);
        fragment.show(fragmentManager, tag);
    }
  
    public interface Callback<T> {
        void call(T obj);
    }
}

DialogFragmentRunnerKt.kt

class DialogFragmentRunnerKt<T : DialogFragment>(
        private val fragmentManager: FragmentManager,
        private val tag: String,
        private val fragmentInitializer: T.() -> Unit) {

    init {
        @Suppress("UNCHECKED_CAST")
        val fragment = fragmentManager.findFragmentByTag(tag) as? T?
        if (fragment != null) {
            fragmentInitializer(fragment)
        }
    }

    fun show(fragment: T) {
        fragmentInitializer(fragment)
        fragment.show(fragmentManager, tag)
    }
}