Exchange Fragments Android

Question

Good people, I’m starting with Android Studio and I’m developing a small app and I made a menu, and I would like when I click on it, open another Fragment. I’ve tried several things already and nothing :/

The last was this

FragmentManager fragmentManager = getFragmentManager();

    if (id == R.id.Aries)
    {
      fragmentManager.beginTransaction().replace(R.id.content_frame, new Aries())
         .commit();
    }

But where is the "new Aries got the error of "cannot find Symbol fragment_aries"

My app will be horoscope, and then I will connect to online database.

Any help on that part too, thank you

Thank you

Attt

Lucas Soares

Answer 1

I do as follows: First I will instantiate a Switch for the menu items clicked.

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //OUTRAS IMPLEMENTAÇÕES

    setContentView(R.layout.activity_main);mNavigationView = (NavigationView)findViewById(R.id.navigation_view);
    mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(MenuItem menuItem) {
            selecionarOpcaoMenu(menuItem);
            return true;
        }
    });
}

Then I implement the method that handles the click event.

private void selecionarOpcaoMenu(MenuItem menuItem){
    mOpcaoSelecionada = menuItem.getItemId();
    menuItem.setChecked(true);
    mDrawerLayout.closeDrawers();

    String titulo = menuItem.getTitle().toString();

    FragmentManager fm = getSupportFragmentManager();

    if(fm.findFragmentByTag(titulo) == null){
        Fragment primeiroNivelFragment = new Fragment();

        getSupportFragmentManager()
                .beginTransaction()
                .replace(R.id.conteudo, primeiroNivelFragment, titulo)
                .commit();
    }
}

I hope I helped you, I have an example of navigation with Fragments if you want to take a look. Here

Answer 2

To make the transition between Mainactivity Fragments with Navdrawer, I use it like this:

   public void displayView(int viewId) {

        Fragment fragment = null;

        switch (viewId) {
            case R.id.fragment_1:
                fragment = new Fragment1();
                title  = "Fragment 1";
                break;
            case R.id.fragment_2:
                fragment = new Fragment2();
                title  = "Fragment 2";
                break;

        if (fragment != null) {
            FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
            ft.replace(R.id.content_frame, fragment);
            ft.commit();
        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);

    }

I hope I helped. You can see more here.

Answer 3

For a new Activity (Activity):

Create a new Activity by the name of MainActivity2 and insert this code below into your method onNavigationItemSelected of his MainActivity:

Intent intent = new Intent(this, MainActivity2.class); 
startActivity(intent);

---

For a new Fragment (Fragment):

Create a new Fragment by the name of sobreFragment and insert this code below into your method onNavigationItemSelected of his MainActivity:

sobreFragment fragment = new sobreFragment();
android.support.v4.app.FragmentTransaction fragmentTrasaction =
getSupportFragmentManager().beginTransaction();
fragmentTrasaction.replace(R.id.fragment_container, fragment);
fragmentTrasaction.commit();