java - 项目上的抽屉导航点击仍保留在主页 fragment 上

Question

我对 Android 比较陌生，我想向我的应用程序添加抽屉导航，因此我添加一个新 Activity 并选择抽屉导航 Activity

Activity 类别

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单击另一个项目时，没有任何反应，它仍然保留在主 fragment 上到目前为止我看到的大部分信息都是 3.6.3 版本之前的旧信息而其他人只是工作到目前为止我尝试过的- 卸载并重新安装android studio- 更新到最新的android studio(目前为4)- 创建了其他 fragment - 盯着新的抽屉导航项目运行它..同样的事情

过去几天我一直在尝试这个问题，但似乎没有任何效果

标题

Answer 1

您可以在抽屉导航的项目上实现onClick。

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;
}

以及其他处理点击的方式:

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;
        }
    });