package com.example.beijingnopowercon; import android.os.Bundle; import android.view.View; import android.view.Menu; import com.google.android.material.snackbar.Snackbar; import com.google.android.material.navigation.NavigationView; import androidx.navigation.NavController; import androidx.navigation.Navigation; import androidx.navigation.ui.AppBarConfiguration; import androidx.navigation.ui.NavigationUI; import androidx.drawerlayout.widget.DrawerLayout; import androidx.appcompat.app.AppCompatActivity; import com.example.beijingnopowercon.databinding.ActivityMainBinding; public class MainActivity extends AppCompatActivity { private AppBarConfiguration mAppBarConfiguration; private ActivityMainBinding binding; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); binding = ActivityMainBinding.inflate(getLayoutInflater()); setContentView(binding.getRoot()); setSupportActionBar(binding.appBarMain.toolbar); DrawerLayout drawer = binding.drawerLayout; NavigationView navigationView = binding.navView; // Passing each menu ID as a set of Ids because each // menu should be considered as top level destinations. mAppBarConfiguration = new AppBarConfiguration.Builder( R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow) .setOpenableLayout(drawer) .build(); NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main); NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration); NavigationUI.setupWithNavController(navigationView, navController); } // @Override // public boolean onCreateOptionsMenu(Menu menu) { // // Inflate the menu; this adds items to the action bar if it is present. // getMenuInflater().inflate(R.menu.main, menu); // return true; // } @Override public boolean onSupportNavigateUp() { NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main); return NavigationUI.navigateUp(navController, mAppBarConfiguration) || super.onSupportNavigateUp(); } }