我收到片段活动的错误，不知道这是关于什么的

Question

import android.os.Bundle;
import android.view.MenuItem;
import com.google.android.material.navigation.NavigationView;
public class Home extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
private DrawerLayout drawer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
drawer = findViewById(R.id.drawer_layout);
NavigationView navigationView = findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar,
R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new BlogsFragment()).commit();
navigationView.setCheckedItem(R.id.blogs);}
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.blogs:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new BlogsFragment()).commit();
break;
case R.id.blogs:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new MedsFragment()).commit();
break;
case R.id.blogs:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new AboutFragment()).commit();
break;
}
drawer.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void onBackPressed() {
if (drawer.isDrawerOpen(GravityCompat.START)){
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
}

这就是错误。

Answer 1

请确保BlogsFragment((、MedsFragment((、AboutFragment(属于片段类型。这些java类必须继承自Fragment类。

public class BlogsFragment extends Fragment {
..
}