Setiap kali saya menjalankan aplikasi ini semuanya berfungsi dengan baik. Tapi tidak ada yang terjadi ketika saya mengklik opsi laci. Ketika saya melakukan debug, saya menyadari bahwa metode onNavigationItemSelected bahkan tidak dipanggil oleh sistem. Tetapi ketika saya membuat transaksi fragmen saya dilakukan dalam metode onCreate, Semuanya berfungsi dengan baik. di sini adalah aktivitas.java
ublic class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener{
DrawerLayout drawerLayout;
ActionBarDrawerToggle toggle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id._toolbar);
setSupportActionBar(toolbar);
NavigationView navigationView = findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
drawerLayout = findViewById(R.id.drawerlayout);
toggle = new ActionBarDrawerToggle(this, drawerLayout, R.string.nav_opened, R.string.nav_closed);
drawerLayout.addDrawerListener(toggle);
Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
displayView(R.id.nav_home);
}
@Override
protected void onPostCreate(@Nullable Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
toggle.syncState();
}
@Override
public void onConfigurationChanged(@NonNull Configuration newConfig) {
super.onConfigurationChanged(newConfig);
toggle.onConfigurationChanged(newConfig);
}
@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
if(toggle.onOptionsItemSelected(item))
return true;
return super.onOptionsItemSelected(item);
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
displayView(item.getItemId());
return true;
}
@Override
public void onBackPressed() {
if(drawerLayout.isDrawerOpen(GravityCompat.START))
drawerLayout.closeDrawer(GravityCompat.START);
else
super.onBackPressed();
}
public void displayView(int viewId) {
Fragment fragment = null;
String title = getString(R.string.app_name);
switch (viewId) {
case R.id.nav_home:
//fragment = new HomeFragment();
break;
case R.id.nav_search:
fragment = new SearchFragment();
break;
case R.id.nav_list:
//fragment = new EatenListFragment();
break;
case R.id.nav_graph:
fragment = new SevenDayGraphFragment();
break;
case R.id.nav_settings:
//fragment = new SettingsFragment();
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.drawerlayout);
drawer.closeDrawer(GravityCompat.START);
}
}
Dan di sini file xml aktivitas
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawerlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:openDrawer="start"
tools:context=".MainActivity">
<include layout="@layout/appbar"
android:layout_height="match_parent"
android:layout_width="match_parent"/>
<com.google.android.material.navigation.NavigationView
android:id="@+id/nav_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="start"
app:headerLayout="@layout/nav_header"
app:menu="@menu/activity_main_drawer">
</com.google.android.material.navigation.NavigationView>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent" android:id="@+id/content_frame"/>
<androidx.fragment.app.FragmentContainerView
android:id="@+id/fragment_container_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.drawerlayout.widget.DrawerLayout>
