Harshit Gyan Harshit Gyan - 4 months ago 32
Java Question

How to set one main activity and populate fragments in android

i have one mainactivity and other fragments , what i want is that by using only that single activity , i show a default fragment in activity and then when user click on navigation drawer then fragments according to that item must populate on the same are but with different information , i had searched a lot but not got proper solution for it , i am pasting my mainactivity class here ,

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, FragmentOne.OnFragmentInteractionListener,
FragmentTwo.OnFragmentInteractionListener {

private ListView mDrawerList;
private String[] mNavigationDrawerItemTitles;
Toolbar toolbar;

private SliderLayout mDemoSlider;

DrawerLayout drawer;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
mTitle = mDrawerTitle = getTitle();
setSupportActionBar(toolbar);
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
NavigationView navView = (NavigationView) findViewById(R.id.nav_right_view);
navView.setNavigationItemSelectedListener(this);

navView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle Right navigation view item clicks here.
int id = item.getItemId();
Fragment fragment = null;
Class fragmentClass = null;


if (id == R.id.nav_settings) {
fragmentClass = first.class;

} else if (id == R.id.nav_logout) {
fragmentClass = secnd.class;

} try {
fragment = (Fragment) fragmentClass.newInstance();
} catch (Exception e) {
e.printStackTrace();
}



FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit();
item.setChecked(true);

setTitle(item.getTitle());

DrawerLayout mDrawer = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawer.closeDrawers();
return true;
}
});
}


code for first fragment class is here ,

public class first extends Fragment {

private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";


private String mParam1;
private String mParam2;

private OnFragmentInteractionListener mListener;

public first() {
// Required empty public constructor
}

/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment FragmentOne.
*/
// TODO: Rename and change types and number of parameters
public static first newInstance(String param1, String param2) {
FragmentOne fragment = new FragmentOne();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_fragment_one, container, false);
}

// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}

@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}

@Override
public void onDetach() {
super.onDetach();
mListener = null;
}

/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}


Thanks in advance

Answer

For solving your problem i am just using your code and doing some improvments ,just use required code in your activity file .

   protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        mTitle = mDrawerTitle = getTitle();
        setSupportActionBar(toolbar);
///it is required code
    if (savedInstanceState == null) {
        Fragment fragment = null;
        Class fragmentClass = null;
        fragment = new Fragmentforslider();
      fragmentClass= FragmentOne.class;
        try {

        } catch (Exception e) {
            e.printStackTrace();
        }

        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit();
    }

    drawer = (DrawerLayout) findViewById(R.id.drawer_layout);