Question

我有一个像这张图片的导航抽屉。我想添加一个节分隔符（如分隔海王星的线）。这似乎很简单，但我无法在网上找到对我的案例有用的任何内容。

这是我的MainActivity：

public class MainActivity extends Activity {
    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    private ActionBarDrawerToggle mDrawerToggle;

    private CharSequence mDrawerTitle;
    private CharSequence mTitle;
    private String[] mPlanetTitles;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTitle = mDrawerTitle = getTitle();
        mPlanetTitles = getResources().getStringArray(R.array.planets_array);
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.left_drawer);

        // set a custom shadow that overlays the main content when the drawer opens
        mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
        // set up the drawer's list view with items and click listener
        mDrawerList.setAdapter(new ArrayAdapter<String>(this,
                R.layout.drawer_list_item, mPlanetTitles));
        mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

        // enable ActionBar app icon to behave as action to toggle nav drawer
        getActionBar().setDisplayHomeAsUpEnabled(true);
        getActionBar().setHomeButtonEnabled(true);

        // ActionBarDrawerToggle ties together the the proper interactions
        // between the sliding drawer and the action bar app icon
        mDrawerToggle = new ActionBarDrawerToggle(
                this,                  /* host Activity */
                mDrawerLayout,         /* DrawerLayout object */
                R.drawable.ic_drawer,  /* nav drawer image to replace 'Up' caret */
                R.string.drawer_open,  /* "open drawer" description for accessibility */
                R.string.drawer_close  /* "close drawer" description for accessibility */
                ) {
            public void onDrawerClosed(View view) {
                getActionBar().setTitle(mTitle);
                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
            }

            public void onDrawerOpened(View drawerView) {
                getActionBar().setTitle(mDrawerTitle);
                invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
            }
        };
        mDrawerLayout.setDrawerListener(mDrawerToggle);

        if (savedInstanceState == null) {
            selectItem(0);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main, menu);
        return super.onCreateOptionsMenu(menu);
    }

    /* Called whenever we call invalidateOptionsMenu() */
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        // If the nav drawer is open, hide action items related to the content view
        boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
        menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
        return super.onPrepareOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
         // The action bar home/up action should open or close the drawer.
         // ActionBarDrawerToggle will take care of this.
        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        // Handle action buttons
        switch(item.getItemId()) {
        case R.id.action_websearch:
            // create intent to perform web search for this planet
            Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
            intent.putExtra(SearchManager.QUERY, getActionBar().getTitle());
            // catch event that there's no activity to handle intent
            if (intent.resolveActivity(getPackageManager()) != null) {
                startActivity(intent);
            } else {
                Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show();
            }
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }

    /* The click listner for ListView in the navigation drawer */
    private class DrawerItemClickListener implements ListView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            selectItem(position);
        }
    }

    private void selectItem(int position) {
        // update the main content by replacing fragments
        Fragment fragment = new PlanetFragment();
        Bundle args = new Bundle();
        args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
        fragment.setArguments(args);

        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();

        // update selected item and title, then close the drawer
        mDrawerList.setItemChecked(position, true);
        setTitle(mPlanetTitles[position]);
        mDrawerLayout.closeDrawer(mDrawerList);
    }

    @Override
    public void setTitle(CharSequence title) {
        mTitle = title;
        getActionBar().setTitle(mTitle);
    }

    /**
     * When using the ActionBarDrawerToggle, you must call it during
     * onPostCreate() and onConfigurationChanged()...
     */

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        // Sync the toggle state after onRestoreInstanceState has occurred.
        mDrawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        // Pass any configuration change to the drawer toggls
        mDrawerToggle.onConfigurationChanged(newConfig);
    }

    /**
     * Fragment that appears in the "content_frame", shows a planet
     */
    public static class PlanetFragment extends Fragment {
        public static final String ARG_PLANET_NUMBER = "planet_number";

        public PlanetFragment() {
            // Empty constructor required for fragment subclasses
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_planet, container, false);
            int i = getArguments().getInt(ARG_PLANET_NUMBER);
            String planet = getResources().getStringArray(R.array.planets_array)[i];

            int imageId = getResources().getIdentifier(planet.toLowerCase(Locale.getDefault()),
                            "drawable", getActivity().getPackageName());
            ((ImageView) rootView.findViewById(R.id.image)).setImageResource(imageId);
            getActivity().setTitle(planet);
            return rootView;
        }
    }
}

activity_main.xml中：

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <ListView
        android:id="@+id/left_drawer"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:choiceMode="singleChoice"
        android:divider="@android:color/transparent"
        android:dividerHeight="0dp"
        android:background="#111"/>
</android.support.v4.widget.DrawerLayout>

drawer_list_item.xml：

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/text1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceListItemSmall"
    android:gravity="center_vertical"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:textColor="#fff"
    android:background="?android:attr/activatedBackgroundIndicator"
    android:minHeight="?android:attr/listPreferredItemHeightSmall"/>

我希望这很简单，但我在网上找不到任何好东西。有没有办法可以隔离海王星并为它创建一个部分？有没有人有什么建议？感谢。

enter image description here

Answer 1

确保使用不同的ID 定义不同的grup。

例如，这是我的drawer_menu.xml：

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <group
        android:id="@+id/menu_top"
        android:checkableBehavior="single">
        <item
            android:checked="true"
            android:id="@+id/drawer_item_timeline"
            android:icon="@drawable/ic_timer_grey600_24dp"
            android:title="@string/drawer_timeline"/>
        <item
            android:id="@+id/drawer_item_reports"
            android:icon="@drawable/ic_timetable_grey600_24dp"
            android:title="@string/drawer_reports"/>
    </group>

    <group
        android:id="@+id/menu_bottom"
        android:checkableBehavior="none">

        <item
            android:id="@+id/drawer_item_settings"
            android:icon="@drawable/ic_settings_black_24dp"
            android:title="@string/drawer_settings" >
        </item>
    </group>
</menu>

Gabriel在评论中添加以下内容：如果该组没有ID，则不会显示分隔符。

Answer 2

要通过分隔线分隔菜单项，仅将具有唯一ID 的项目分组，如以下示例所示：

activity_main_drawer.xml：

var incompleteSet = new HashSet<string>(incompleteList);

IEnumerable<string> missing = completeList.Where(str => !incompleteSet.Contains(str));

视觉结果：

Answer 3

我的hacky方法类似于Mostrapotski's。

在我的自定义适配器的布局中，我在每个项目的开头添加了一个水平分隔符，并将其可见性设置为已消失。

对于标记新组开头的元素，我将其可见性设置为可见，以便分隔符显示在其上方。

Answer 4

您有两个选择

您的商品可以分开（顶部的列表和底部的经典视图）。然后代替主布局中的listview（android：id =“@ + id / left_drawer”），你可以有一个相当复杂的LinearLayout，包括那3个项目（列表，分隔符和底部视图）
您的项目必须与示例完全相同，然后您需要列表中的分隔符，您可以使用适配器中的某些逻辑在需要分隔符的列表项目顶部绘制视图。（意味着您的列表项不再是单个textview，而是带有分隔符的LinearLayout（根据适配器的逻辑，有时可见）。

为了帮助您提供一些示例代码，您可以在菜单中发布所需的所有项目吗？我们需要确切地知道什么是静态的以及什么是可滚动的。

编辑：如果您希望使用该示例，请删除该行

mDrawerList.setAdapter(new ArrayAdapter<String>(this, ...)

您需要提供这样的自制适配器： https://github.com/codepath/android_guides/wiki/Using-an-ArrayAdapter-with-ListView

正如我在2中所说，在你的适配器中，你将拥有逻辑，因此你可以在getView（）方法中说出

if(myPlanet.isNeptune()) 
    holder.mSepatator.setVisibility(View.VISIBLE);
else 
    holder.mSepatator.setVisibility(View.GONE);

Answer 5

在菜单文件中添加组以添加分隔线 enter image description here

    </item>
</group>

Answer 6

添加组以在导航抽屉中添加分隔线

    </item>
</group>

如何在Android中为Navigation Drawer添加一个部分分隔符？

6 个答案: