Dialog schließt aktuelle Activity

public class Unit_Activity extends AppCompatActivity implements Unit_Dialog_Add.Unit_Dialog_Listener {




    private Unit_Adapter adapter;


FloatingActionButton buttonAddUnit;


Animation rotateClose, rotateOpen;


    boolean isOpen = false;


    private String userId;


@Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
setContentView(R.layout.activity_unit);


initAddUnit();
setUpRecyclerView();


}


    private void setUpRecyclerView(){
        Query query = callRef.orderBy("unit_name",Query.Direction.DESCENDING);


FirestoreRecyclerOptions<Unit_Model> options = new FirestoreRecyclerOptions.Builder<Unit_Model>()
                .setQuery(query, Unit_Model.class )
                .build();


adapter = new Unit_Adapter(options);


RecyclerView recyclerView = findViewById(R.id.unit_recycler_view);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);


        new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0,
ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
            @Override
public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
                return false;
}


            @Override
public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
                switch (direction){
                    case ItemTouchHelper.LEFT:{
                        adapter.deleteUnit(viewHolder.getAdapterPosition());
                        break;
}
                    case ItemTouchHelper.RIGHT:{
                        // edit
break;
}
                }
            }


            @Override
public void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
                new RecyclerViewSwipeDecorator.Builder(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive)
                        .addSwipeLeftBackgroundColor(ContextCompat.getColor(Unit_Activity.this, R.color.colorDelete))
                        .addSwipeLeftActionIcon(R.drawable.ic_delete)
                        .addSwipeRightBackgroundColor(ContextCompat.getColor(Unit_Activity.this, R.color.colorEdit))
                        .addSwipeRightActionIcon(R.drawable.ic_baseline_edit_24)
                        .create()
                        .decorate();


                super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
        }).attachToRecyclerView(recyclerView);


recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener(){
            @Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy){
                if (dy > 0)
                    buttonAddUnit.hide();
                else if (dy < 0)
                    buttonAddUnit.show();
}
        });


}


    // app im Vordergrund
@Override
protected void onStart() {
        super.onStart();
adapter.startListening();
}


    // app im Hintergrund
@Override
protected void onStop() {
        super.onStop();
adapter.stopListening();
}


    public void openDialog(){
        Unit_Dialog_Add unit_dialog_add = new Unit_Dialog_Add();
unit_dialog_add.show(getSupportFragmentManager(), "unit dialog");
}


    private void initAddUnit() {
        buttonAddUnit = findViewById(R.id.button_add_unit);


rotateClose = AnimationUtils.loadAnimation(this, R.anim.rotate_close_anim);
rotateOpen = AnimationUtils.loadAnimation(this, R.anim.rotate_open_anim);


buttonAddUnit.setOnClickListener(new View.OnClickListener(){
            @Override
public void onClick(View view) {
                switch (view.getId()){
                    case R.id.button_add_unit:{
                        animateAddUnit();
openDialog();
                        break;
}
                }
            }
        });
}


    private void animateAddUnit(){
        if (isOpen){
            buttonAddUnit.startAnimation(rotateClose);
isOpen = false;


} else {
            buttonAddUnit.startAnimation(rotateOpen);
isOpen = true;
}
    }




    @Override
public void applyInfos(String unit_name, String unit_location, String unit_callname) {


unitRef.add(new Unit_Model(1, unit_name, unit_location, unit_callname));


Toast.makeText(this,"Einheit erstellt!", Toast.LENGTH_SHORT).show();
finish();


animateAddUnit();
}


    @Override
public void changeButton() {
        animateAddUnit();
}

public class Unit_Dialog_Add extends AppCompatDialogFragment {


    private EditText edit_unit_name;
    private EditText edit_unit_location;
    private EditText edit_unit_district;


    private Unit_Dialog_Add.Unit_Dialog_Listener unit_dialog_listener;


@NonNull
    @Override
public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());


LayoutInflater inflater = getActivity().getLayoutInflater();
View view = inflater.inflate(R.layout.dialog_unit_add, null);


builder.setView(view)
                .setTitle("Fahrzeugdaten")
                .setNegativeButton("cancel", new DialogInterface.OnClickListener() {
                    @Override
public void onClick(DialogInterface dialogInterface, int i) {
                        unit_dialog_listener.changeButton();
}
                })
                .setPositiveButton("ok", new DialogInterface.OnClickListener() {
                    @Override
public void onClick(DialogInterface dialogInterface, int i) {
                        String unit_name = edit_unit_name.getText().toString();
String unit_location = edit_unit_location.getText().toString();
String unit_district = edit_unit_district.getText().toString();


unit_dialog_listener.applyInfos(unit_name, unit_location, unit_district);
}
                });


edit_unit_name = view.findViewById(R.id.edit_unit_name);
edit_unit_location = view.findViewById(R.id.edit_unit_location);
edit_unit_district = view.findViewById(R.id.edit_unit_district);


        return builder.create();
}


    @Override
public void onAttach(@NonNull Context context) {
        super.onAttach(context);


        try {
            unit_dialog_listener = (Unit_Dialog_Add.Unit_Dialog_Listener) context;
} catch (ClassCastException e) {
            throw new ClassCastException(context.toString() + " must implement Vehicle_Dialog_Listener");
}
    }


    public interface Unit_Dialog_Listener{
        void applyInfos(String unit_name, String unit_location, String unit_district);
        void changeButton();
}