Set text fragment from main activity

Question

im trying to set text inside my fragment file from the main activity. here is my code

this is my mainActivity.java

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    db = new SQLiteHandler(getApplicationContext());

    session = new SessionManager(getApplicationContext());

    if (!session.isLoggedIn()) {
        logoutUser();
    }

    HashMap<String, String> user = db.getUserDetails();

    fragmentTransaction = getSupportFragmentManager().beginTransaction();
    fragmentTransaction.add(R.id.main_container, new HomeFragment());
    fragmentTransaction.commit();

    getSupportActionBar().setTitle("Home Fragment");

    navigationView = (NavigationView)findViewById(R.id.navigation_view);
    navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(MenuItem item) {
            switch (item.getItemId()){
                case R.id.home_id:
                    fragmentTransaction = getSupportFragmentManager().beginTransaction();
                    fragmentTransaction.replace(R.id.main_container, new HomeFragment());
                    fragmentTransaction.commit();
                    getSupportActionBar().setTitle("Home Fragment");
                    item.setChecked(true);
                    break;

                case R.id.help_id:
                    fragmentTransaction = getSupportFragmentManager().beginTransaction();
                    fragmentTransaction.replace(R.id.main_container, new HelpFragment());
                    fragmentTransaction.commit();
                    getSupportActionBar().setTitle("Help Fragment");
                    item.setChecked(true);
                    break;

                case R.id.logout:
                    logoutUser();
            }

            return false;
        }
    });

}

and i have this (HomeFragment.java)

public class HomeFragment extends Fragment {

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

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    return inflater.inflate(R.layout.fragment_home, container, false);
 }
}

and i have this on my fragment_home.xml

<TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:textColor="@color/lbl_name"
        android:textSize="24dp" />

so can i set 'name' from the mainActivity? if yes, please let me know how?

You need to hold fragment reference, and do what @Rohit5k2 say — Lucas Ferraz, Jun 20 '16 at 20:04
http://stackoverflow.com/questions/16295101/how-to-change-fragments-textviews-text-from-activity — Lucas Ferraz, Jun 20 '16 at 20:07
if you want to change this text dynamically there is better way to do this : EventBus library — Kapta, Jun 20 '16 at 20:09

score 2 · Accepted Answer · answered Jun 20 '16 at 20:17

When adding your fragment you can assign a tag to it:

fragmentTransaction.add(R.id.main_container, new HomeFragment(), "MY_FRAGMENT");
fragmentTransaction.commit();

When you need to change the TextView you can recover the fragment with the used tag and call a method of the fragment that changes the text:

HomeFragment fragment = (HomeFragment) getSupportFragmentManager()
    .findFragmentByTag("MY_FRAGMENT");
fragment.changeText("New text");

If you are not using the support library, replace getSupportFragmentManager() with getFragmentManager().

That method inside the HomeFragment class would be:

public void changeText(String newText) {
    TextView textview = (TextView) getView().findViewById(R.id.name);
    textview.setText(newText);
}

Quick learner · Answer 2 · 2016-06-20T20:10:04.893

0

Here is your error you are not proving any view for textview ing oncreate view, try this

HomeFragment Class

public static TextView mTextView;



   @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
      View  view = inflater.inflate(R.layout.fragment_home, container, false);

     mTextView=(TextView)view.findviewById(R.id.name);

    return view;
    }

And In your class Activity

after adding fragment call like this

HomeFragment.mTextView.setText("Name");

Try the above code

edited Jun 20 '16 at 20:10

answered Jun 20 '16 at 20:05

Quick learner

10,632
4
45
55

1

He wants to set a text that come FROM activity not hardcoded set inside fragment – Lucas Ferraz Jun 20 '16 at 20:06
This is not what OP is asking for. – Rohit5k2 Jun 20 '16 at 20:09

Set text fragment from main activity

2 Answers2