导航抽屉中的项目点击后，仍在主页上的片段

Question

我是一个比较新的安卓用户，我想在我的应用程序中添加一个导航抽屉，所以我添加了一个新的活动，并选择导航抽屉的活动。

活动课

import android.os.Bundle;
import android.view.View;
import android.view.Menu;

import com.google.android.material.floatingactionbutton.FloatingActionButton;
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 androidx.appcompat.widget.Toolbar;

public class HomeActivity extends AppCompatActivity {

    private AppBarConfiguration mAppBarConfiguration;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        NavigationView navigationView = findViewById(R.id.nav_view);
        // 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)
                .setDrawerLayout(drawer)
                .build();
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        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.home, menu);
        return true;
    }

    @Override
    public boolean onSupportNavigateUp() {
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        return NavigationUI.navigateUp(navController, mAppBarConfiguration)
                || super.onSupportNavigateUp();
    }
}

当我运行应用程序并尝试点击另一个项目时，什么都没有发生，它仍然是在主片段上，到目前为止，我所看到的大部分信息是旧的3.6.3版本之前，其他只是工作 到目前为止，我已经尝试了什么- 卸载并重新安装android studio-更新到最新的android studio(目前是4)-创建其他碎片-盯着新的导航抽屉项目运行它...同样的事情。

一直在这个过去的几天没有什么我尝试似乎工作

标题

Answer 1

你可以通过使用下面的行来轻松地关闭抽屉，在点击抽屉的每个项目时处理它。

drawer_layout.closeDrawer(GravityCompat.END)

Answer 2

你可以实现 onClick 在导航抽屉的项目上。

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener

并添加此方法来处理点击监听器。

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
// Handle navigation view item clicks here.
switch (item.getItemId()) {

   case R.id.nav_home: {
  //do somthing
        break;
    }  

  case R.id.nav_gallery: {
  //do somthing
        break;
    }  

   case R.id.nav_slideshow: {
  //do somthing
        break;
    }  
}
//close navigation drawer
drawer.closeDrawer(GravityCompat.END);
return true;
}

和其他方法来处理点击。

navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
            int id=menuItem.getItemId();
            //it's possible to do more actions on several items, if there is a large amount of items I prefer switch(){case} instead of if()
            if (id==R.id.nav_home){
                Toast.makeText(getApplicationContext(), "Home", Toast.LENGTH_SHORT).show();
            }

           if (id==R.id.nav_gallery){
                Toast.makeText(getApplicationContext(), "nav_gallery", Toast.LENGTH_SHORT).show();
            }

           if (id==R.id.nav_slideshow){
                Toast.makeText(getApplicationContext(), "slideshow", Toast.LENGTH_SHORT).show();
            }
            //This is for maintaining the behavior of the Navigation view
            NavigationUI.onNavDestinationSelected(menuItem,navController);
            //This is for closing the drawer after acting on it
            drawer.closeDrawer(GravityCompat.START);
            return true;
        }
    });