Androidx自定义navigationItem选择动作答案

【问题标题】：Androidx customize navigationItem selected actionAndroidx自定义navigationItem选择动作
【发布时间】：2020-07-27 01:41:30
【问题描述】：

我已经使用 android studio 模板（导航抽屉活动）创建了一个导航抽屉活动。现在在 androidx & android studio 3.5.3 他们已经改变了导航抽屉活动的实现。在java类中的实现看起来像

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);

而onCreateOptionsMenu 采用ContextMenu、View 和ContextMenu.ContextMenuInfo 而不仅仅是Menu

@Override
    public void onCreateOptionsMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.nav_drawer_main, menu);
    }

但是没有onOptionsItemSelected 或onContextItemSelected 方法。所以我的问题是如果我想自定义抽屉项点击事件，我该怎么做？假设我想将 intentExtra 传递给片段，或者我必须检查特定项目点击的变量值。

提前致谢。

【问题讨论】：

标签： android android-studio android-fragments navigation-drawer

【解决方案1】：

我已经完成了 addOnDestinationChangedListener 的工作。在此方法中，您可以切换 id，您在 AppBarConfiguration.Builder 方法中给出。在我的实现中，我隐藏或显示基于点击事件的布局。

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) {
            //item with id nav_home found do your work
            main_activity_layout.setVisibility(View.VISIBLE);
            Toast.makeText(getApplicationContext(), "Nav Home Pressed!", Toast.LENGTH_SHORT).show();
         } else {
            main_activity_layout.setVisibility(View.GONE);
            Toast.makeText(getApplicationContext(), "onDestChangeElse!", Toast.LENGTH_SHORT).show();
         }
     }
  });

【讨论】：

【解决方案2】：

AndroidX Drawer Navigation 实现和以前一样简单

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ...
        ...
        drawerLayout = findViewById(R.id.drawer_layout);
        navigationView = findViewById(R.id.nav_view);
        setupNavigation();
    }
    private void setupNavigation() {
        // link Toggle button with Drawer
        final ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            actionBar.setDisplayHomeAsUpEnabled(true);
            drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close)
            {

                public void onDrawerClosed(View view)
                {
                    supportInvalidateOptionsMenu();
                    //drawerOpened = false;
                }

                public void onDrawerOpened(View drawerView)
                {
                    supportInvalidateOptionsMenu();
                    //drawerOpened = true;
                }
            };
            drawerToggle.setDrawerIndicatorEnabled(true);
            drawerLayout.setDrawerListener(drawerToggle);
            drawerToggle.syncState();
        }

        // Create Menu for NavigationView
        Menu menu = navigationView.getMenu();
        menu.add(category.getName());
        menu.getItem(0).setIcon(category.getIcon());
        menu.getItem(0).setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                @Override
                public boolean onMenuItemClick(MenuItem menuItem) {
                    drawerLayout.closeDrawers();

                    // TODO; Here's your sexy looking codes ;P must return false if you don't know what `true` do

                    return false;
                }
            });
    }

【讨论】：