这个新的 Android studio 3.5 Navigation Drawer 示例代码如何运行

Posted 2023-04-13

【中文标题】这个新的 Android studio 3.5 Navigation Drawer 示例代码如何运行

【英文标题】：How does this new Android studio 3.5 Navigation Drawer sample code run

【发布时间】：2020-01-11 14:33:28

【问题描述】：

我在学习 android Studio 并了解了有关抽屉式导航的一些知识。 后来我将我的 Android Studio 更新到 3.5 版本 现在我看到旧代码已经消失了。 我看到的新代码，因为我是一个新学习者，我完全困惑这个新代码如何用于片段， 是的，我尝试过搜索，但没有一个有效 有人可以帮我解决以下代码吗？

    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,
            R.id.nav_tools, R.id.nav_share, R.id.nav_send)
            .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();

我想在点击菜单后打开相关的片段。

【参考方案1】：

来自文件 xml >>activity_main.xml 查看默认顺序

<com.google.android.material.navigation.NavigationView
    android:id="@+id/nav_view"
    android:layout_
    android:layout_
    android:layout_gravity="start"
    android:fitsSystemWindows="true"
    app:headerLayout="@layout/nav_header_main"
    app:menu="@menu/activity_main_drawer" />

<include
    layout="@layout/app_bar_main"
    android:layout_
    android:layout_ />

更改为以下顺序：

<include
    layout="@layout/app_bar_main"
    android:layout_
    android:layout_ />

<com.google.android.material.navigation.NavigationView
    android:id="@+id/nav_view"
    android:layout_
    android:layout_
    android:layout_gravity="start"
    android:fitsSystemWindows="true"
    app:headerLayout="@layout/nav_header_main"
    app:menu="@menu/activity_main_drawer" />

在java中使用

      navController.addOnDestinationChangedListener(new NavController.OnDestinationChangedListener() 
            @Override
            public void onDestinationChanged(@NonNull NavController controller, @NonNull
                    NavDestination destination, @Nullable Bundle arguments) 
                if (destination.getId() == R.id.nav_home) 
                    Toast.makeText(MainActivity.this, "home", Toast.LENGTH_LONG).show();
                
                if (destination.getId() == R.id.nav_gallery) 
                    Toast.makeText(MainActivity.this, "nav_gallery", Toast.LENGTH_LONG).show();
                
                if (destination.getId() == R.id.nav_slideshow) 
                    Toast.makeText(MainActivity.this, "nav_slideshow", Toast.LENGTH_LONG).show();
                
                if (destination.getId() == R.id.nav_tools) 
                    Toast.makeText(MainActivity.this, "nav_tools", Toast.LENGTH_LONG).show();
                
                if (destination.getId() == R.id.nav_share) 
                    Toast.makeText(MainActivity.this, "nav_share", Toast.LENGTH_LONG).show();
                
                if (destination.getId() == R.id.nav_send) 
                    Toast.makeText(MainActivity.this, "nav_send", Toast.LENGTH_LONG).show();
                
            
        );

【讨论】：

很棒的兄弟...我用的是旧方法，检查了这个方法完美...