In meiner App habe ich eine NavigationDrawer in meiner App, die zwei Fragmente, die ich anzeigen möchte (Fragment1 und Fragment2) in einer MainActivity. Ich habe einen Menüeintrag in meiner ToolBar in Fragment 1, wenn ich auf meine MainActivity geklickt habe, um zu Fragment2 zu wechseln und die NavigationView die Änderungen der Benutzeroberfläche widerzuspiegeln.Fragment zu fragmentieren Kommunikation innerhalb eines NavigationDrawer
public class MainActivity extends AppCompatActivity {
private DrawerLayout mDrawer;
private Toolbar toolbar;
private NavigationView nvDrawer;
private ActionBarDrawerToggle drawerToggle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction().replace(R.id.flContent, new BookListFragment()).commit();
}
// Set a Toolbar to replace the ActionBar.
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Find our drawer view
mDrawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawerToggle = setupDrawerToggle();
// Tie DrawerLayout events to the ActionBarToggle
mDrawer.addDrawerListener(drawerToggle);
// Find our drawer view
nvDrawer = (NavigationView) findViewById(R.id.nvView);
// Setup drawer view
setupDrawerContent(nvDrawer);
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
drawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggles
drawerToggle.onConfigurationChanged(newConfig);
}
private ActionBarDrawerToggle setupDrawerToggle() {
// NOTE: Make sure you pass in a valid toolbar reference. ActionBarDrawToggle() does not require it
// and will not render the hamburger icon without it.
return new ActionBarDrawerToggle(this, mDrawer, toolbar, R.string.drawer_open, R.string.drawer_close);
}
private void setupDrawerContent(NavigationView navigationView) {
navigationView.setNavigationItemSelectedListener(
new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
selectDrawerItem(menuItem);
return true;
}
});
}
public void selectDrawerItem(MenuItem menuItem) {
// Create a new fragment and specify the fragment to show based on nav item clicked
Fragment fragment = null;
Class fragmentClass;
switch (menuItem.getItemId()) {
case R.id.book_list_fragment:
fragmentClass = BookListFragment.class;
break;
case R.id.discover_fragment:
fragmentClass = DiscoverFragment.class;
break;
default:
fragmentClass = BookListFragment.class;
}
try {
fragment = (Fragment) fragmentClass.newInstance();
} catch (Exception e) {
e.printStackTrace();
}
// Insert the fragment by replacing any existing fragment
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit();
// Highlight the selected item has been done by NavigationView
menuItem.setChecked(true);
// Set action bar title
setTitle(menuItem.getTitle());
// Close the navigation drawer
mDrawer.closeDrawers();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// The action bar home/up action should open or close the drawer.
switch (item.getItemId()) {
case android.R.id.home:
mDrawer.openDrawer(GravityCompat.START);
return true;
}
if (drawerToggle.onOptionsItemSelected(item)) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Fragment-Code
public class BookListFragment extends Fragment {
...
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_insert_dummy_data:
insertBook();
return true;
case R.id.action_delete_all_entries:
int rowsDeleted = getContext().getContentResolver().delete(ShelfHelpContract.BookEntry.CONTENT_URI, null, null);
return true;
case R.id.action_discover:
/*TODO Here I want to open another Fragment and have it reflect
in the UI on my NavigationView and MainActivity
*/
return true;
}
return super.onOptionsItemSelected(item);
....
}
"haben die NavigationView spiegeln die UI Änderungen" Welche Benutzeroberfläche ändert? –
In der NavigationView möchte ich auf der Benutzeroberfläche anzeigen, dass die Einträge im Menü "Schublade" geändert wurden und nicht nur mein aktuelles Fragment durch ein neues ersetzt wurde. –
Eigentlich sollten Sie nur navigieren, indem Sie das ausgewählte Element in der Navigationsansicht festlegen. Der Listener sollte die Navigation zum Fragment übernehmen. – EpicPandaForce