I have RecyclerView
on LightsFragment
, and I want to sort it from the MainActivity which contain this fragment.
Here is what I have now:
Thats the function that sorting my adapter:
Collections.sort(lights);
lightsAdapter.updateData(lights);
LightsFragment
- handling the adapter that should be sorted.
public class LightsFragment extends Fragment implements LightsPresenter, View.OnClickListener {
private RecyclerView RVLights;
private ArrayList<Light> lights = new ArrayList<>();
private Light light;
private LightsAdapter lightsAdapter;
private LightsView presenter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_lights, container, false);
presenter = new LightsView(lights, light, this);
RVLights = view.findViewById(R.id.RVLights);
presenter.loadData();
return view;
}
@Override
public void setAdapter() {
lightsAdapter = new LightsAdapter(getActivity(), lights);
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getActivity(), 3);
RVLights.setLayoutManager(layoutManager);
RVLights.setAdapter(lightsAdapter);
}
}
MainActivity - handling 3 buttons, one of the buttons should sort adapter.
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Greetings mGreetings = new Greetings();
private TextView mTVgreetings;
private Button BTNmLights, BTNmGarage, BTNmSortBy;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
mTVgreetings = findViewById(R.id.TVgreetings);
initFunctions();
}
public void showLightsFragment() {
getSupportFragmentManager().beginTransaction().add(R.id.main_fragment_container, new LightsFragment())
.commit();
}
public void initFunctions() {
showLightsFragment();
showGreetings();
}
public void showGreetings() {
mTVgreetings.setText(mGreetings.getGreetings());
}
public void initView() {
BTNmLights = findViewById(R.id.BTNlights);
BTNmGarage = findViewById(R.id.BTNgarage);
BTNmSortBy = findViewById(R.id.BTNsort);
BTNmLights.setOnClickListener(this);
BTNmGarage.setOnClickListener(this);
BTNmSortBy.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.BTNlights:
//TODO open lights fragment...
break;
case R.id.BTNgarage:
//TODO open garage fragment...
break;
case R.id.BTNsort:
//TODO make drop down with sort light and garage.
break;
}
}
}
I want that when i pressing on sort button on main activity, the adapter from LightsFragment will be sorted. I already have a function that sorting adapter. Just don't know how to access the adapter from the Main activity.
Store the Fragment instance in Activity and access it any time.
private LightsFragment lightsFragment= new LightsFragment();
public void showLightsFragment() {
getSupportFragmentManager()
.beginTransaction().add(R.id.main_fragment_container, this.lightFragment)
.commit();
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.BTNlights:
//TODO open lights fragment...
break;
case R.id.BTNgarage:
//TODO open garage fragment...
break;
case R.id.BTNsort:
this.lightFragment.sortLights()
//TODO make drop down with sort light and garage.
break;
}
}
and in your LightFragment you should have a method to find the RecylerView and get it's adapter to update the list and notifyDataSetChanged
First, create a getter method for your LightsAdapter in Fragment. After, get the fragment in the mainActivity with the help of
Fragment yourFragment=getSupportFragmentManager().findFragmentById(R.id.main_fragment_container);
Later, check if the fragment is your fragment or not:
if(yourFragment instanceOf LightsFragment)
{
yourFragment.getAdapter();
}
You can do that using interface
.
create an interface like
public interface UpdateFrag {
void sortAdapter(int sortType);
}
In your Activity do the following
UpdateFrag updatFrag ;// add this line
public void showLightsFragment() {
Fragment lightsFragment = new LightsFragment();
updatFrag = lightsFragment; // here you initialize updatFrag
fragment.getSupportFragmentManager().beginTransaction().add(R.id.main_fragment_container, lightsFragment)
.commit();
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.BTNlights:
break;
case R.id.BTNgarage:
//TODO open garage fragment...
break;
case R.id.BTNsort:
// here you should call sortAdapter method.
updatFrag.sortAdapter(1) // suppose 1 for light and 2 for garage
break;
}
}
Now in your LightsFragment
implement the interface.
public class LightsFragment extends Fragment implements LightsPresenter, View.OnClickListener, UpdateFrag {
// ....
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// ....
}
@Override
public void setAdapter() {
// ....
}
@Override
public void sortAdapter(int sortType) {
if (sortType == 1){
// here you can sort your adapter according to light
}else{
// here you can sort your adapter according to garage
}
}
}
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