Switch Between Fragments with Onnavigationitemselected in New Navigation Drawer Activity Template (Android Studio 1.4 Onward)

Switch between Fragments with onNavigationItemSelected in new Navigation Drawer Activity template (Android Studio 1.4 onward)

So, based on @L.L.'s answer I was able to solve this problem.

First of all, add your FrameLayout to your content_main.xml file:

<FrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent" android:id="@+id/content_frame"/>

In your MainActivity (or whatever you have named the Activity with the navigation drawer) define a method named displayView

 public void displayView(int viewId) {

    Fragment fragment = null;
    String title = getString(R.string.app_name);

    switch (viewId) {
        case R.id.nav_news:
            fragment = new NewsFragment();
            title  = "News";

            break;
        case R.id.nav_events:
            fragment = new EventsFragment();
            title = "Events";
            break;

    }

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

    // set the toolbar title
    if (getSupportActionBar() != null) {
        getSupportActionBar().setTitle(title);
    }

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

}

Am switching between 3 custom Fragments; NewsFragment, EventsFragment and GalleryFragment.

in my menu activity_main_drawer I have changed the content to this:

<menu xmlns:android="http://schemas.android.com/apk/res/android">

<group android:checkableBehavior="single">
    <item android:id="@+id/nav_news"  
        android:icon="@android:drawable/ic_menu_news"
        android:title="News" />
    <item android:id="@+id/nav_events" 
        android:icon="@android:drawable/ic_menu_events"
        android:title="Events" />
    <item android:id="@+id/nav_gallery" 
        android:icon="@android:drawable/ic_menu_gallery"
        android:title="Gallery" />
  </group>
</menu>

Going back to the Activity class, in your onNavigationItemSelected method
do this:

@Override
public boolean onNavigationItemSelected(MenuItem item) {
    displayView(item.getItemId());
    return true;
}

Finally, the last statement in your onCreate method:

 @Override
protected void onCreate(Bundle savedInstanceState) {
    ....
    ....
    displayView(R.id.nav_news);
}

This is because I want the first view my user sees to be News.Change it to whatever you choose.

Handle back press event:

As it stands, if you press the back button from any of the Fragments, the app exits.I want my app to go back to the News Fragment (my home fragment) when the user presses the back button. So I did this:

Declared a boolean variable:

private boolean viewIsAtHome;

then in the displayView() method I did this:

 public void displayView(int viewId){
    Fragment fragment = null;
    String title = getString(R.string.app_name);

    switch (viewId) {
        case R.id.nav_news:
            fragment = new NewsFragment();
            title  = getString(R.string.news_title);
            viewIsAtHome = true;

            break;
        case R.id.nav_events:
            fragment = new EventsFragment();
            title = getString(R.string.events_title);
            viewIsAtHome = false;
            break;

        case R.id.nav_gallery:
            fragment = new GalleryFragment();
            title = getString(R.string.gallery_title);
            viewIsAtHome = false;
            break;

Finally, delete your old onBackPressed method and create a new one like this outside the onCreate() method:

@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    }
    if (!viewIsAtHome) { //if the current view is not the News fragment
        displayView(R.id.nav_news); //display the News fragment
    } else {
        moveTaskToBack(true);  //If view is in News fragment, exit application
    }
}

Works for me.

Switching Fragments in navigation drawer using onNavigationItemSelected()

By your logcat, error is:

com.internetwarz.sploon.MainActivity@3caae0bc must implement OnFragmentInteractionListener

I think the error happened because your parent activity (MainActivity.java) did not implement this method: OnFragmentInteractionListener

You can see by the comments:

/**
 * 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.
 */
public interface OnFragmentInteractionListener {
    // TODO: Update argument type and name
    void onFragmentInteraction(Uri uri);
}

So, the solution would be:

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

    ....

    // Add the method below to MainActivity.java
    private void onFragmentInteraction(Uri uri) {
        // Do something or just return
        Toast.makeText(this, "Success", Toast.LENGTH_SHORT).show();
    }
}

How to switch between fragments in android like drawer menu without FrameLayout?

If you are using the Navigation Component as the template does, you should navigate to a destination by calling navigate() - this is precisely what the NavigationUI.setupWithNavController() is doing for you when you tap on an item in the NavigationView via NavigationUI.onNavDestinationSelected().

You do not use a FragmentTransaction at all when using the Navigation Component.

onNavigationItemSelected() function not present in MainActivity of Navigation Drawer Activity

MainActivity needs to implement NavigationView.OnNavigationItemSelectedListener in order to override its functions:

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
    ...

    @Override
    public boolean onNavigationItemSelected(MenuItem item){
        int id = item.getItemId();

        // any code
    }

    ...
}

How to open Activity from Android's built-in navigation drawer

navigationView.setNavigationItemSelectedListener(this)

I did not see this line of code in your code. Apparently you didn’t set a listener

Navigation drawer with Activity and child Fragments

I solved this issue by simply overriding the up carat behavior by calling the mDrawerToggle.setDrawerIndicatorEnabled(enable) and passing the boolean enable or disable as needed.

(The fragments where I didn't want the drawer to show called this method with false and where I wanted the drawer to be shown called this method with true. I put the call inside the onResume() of the respective fragment for obvious reasons.)

This works exactly like I want, and I did not have to change the design of my project :).

---

Related Topics