Как создать многоуровневое меню в макете ящика для навигации

Question

Я хочу создать многоуровневое меню в макете ящика. Мой Activity.xml: -

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


<LinearLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical"> 

    <LinearLayout 
     android:id="@+id/container_toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical"> 

     <include 
      android:id="@+id/toolbar" 
      layout="@layout/toolbar" /> 
    </LinearLayout> 

    <FrameLayout 
     android:id="@+id/container_body" 
     android:layout_width="fill_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" /> 


</LinearLayout> 


<fragment 
    android:id="@+id/fragment_navigation_drawer" 
    android:name="com.android.ShoppingMazza.activity.FragmentDrawer" 
    android:layout_width="@dimen/nav_drawer_width" 
    android:layout_height="match_parent" 
    android:layout_gravity="start" 
    app:layout="@layout/fragment_navigation_drawer" 
    tools:layout="@layout/fragment_navigation_drawer" /> 

Вот мой fragment_navigation_drawer.xml: -

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:background="@android:color/white"> 

<android.support.v7.widget.RecyclerView 
    android:id="@+id/drawerList" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_marginTop="15dp" /> 

Вот мой FragmentDrawer.java

public class FragmentDrawer extends Fragment { 

private static String TAG = FragmentDrawer.class.getSimpleName(); 

private RecyclerView recyclerView; 
private ActionBarDrawerToggle mDrawerToggle; 
private DrawerLayout mDrawerLayout; 
private NavigationDrawerAdapter adapter; 
private View containerView; 
private static String[] titles = null; 
private FragmentDrawerListener drawerListener; 

public FragmentDrawer() { 

} 

public void setDrawerListener(FragmentDrawerListener listener) { 
    this.drawerListener = listener; 
} 

public static List<NavDrawerItem> getData() { 
    List<NavDrawerItem> data = new ArrayList<>(); 


    // preparing navigation drawer items 
    for (int i = 0; i < titles.length; i++) { 
     NavDrawerItem navItem = new NavDrawerItem(); 
     navItem.setTitle(titles[i]); 
     data.add(navItem); 
    } 
    return data; 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    // drawer labels 
    titles = getActivity().getResources().getStringArray(R.array.nav_drawer_labels); 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflating view layout 
    View layout = inflater.inflate(R.layout.fragment_navigation_drawer, container, false); 
    recyclerView = (RecyclerView) layout.findViewById(R.id.drawerList); 

    adapter = new NavigationDrawerAdapter(getActivity(), getData()); 
    recyclerView.setAdapter(adapter); 
    recyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); 
    recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getActivity(), recyclerView, new ClickListener() { 
     @Override 
     public void onClick(View view, int position) { 
      drawerListener.onDrawerItemSelected(view, position); 
      mDrawerLayout.closeDrawer(containerView); 
     } 

     @Override 
     public void onLongClick(View view, int position) { 

     } 
    })); 

    return layout; 
} 


public void setUp(int fragmentId, DrawerLayout drawerLayout, final Toolbar toolbar) { 
    containerView = getActivity().findViewById(fragmentId); 
    mDrawerLayout = drawerLayout; 
    mDrawerToggle = new ActionBarDrawerToggle(getActivity(), drawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close) { 
     @Override 
     public void onDrawerOpened(View drawerView) { 
      super.onDrawerOpened(drawerView); 
      getActivity().invalidateOptionsMenu(); 
     } 

     @Override 
     public void onDrawerClosed(View drawerView) { 
      super.onDrawerClosed(drawerView); 
      getActivity().invalidateOptionsMenu(); 
     } 

     @Override 
     public void onDrawerSlide(View drawerView, float slideOffset) { 
      super.onDrawerSlide(drawerView, slideOffset); 
      toolbar.setAlpha(1 - slideOffset/2); 
     } 
    }; 

    mDrawerLayout.setDrawerListener(mDrawerToggle); 
    mDrawerLayout.post(new Runnable() { 
     @Override 
     public void run() { 
      mDrawerToggle.syncState(); 
     } 
    }); 

} 

public static interface ClickListener { 
    public void onClick(View view, int position); 

    public void onLongClick(View view, int position); 
} 

static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener { 

    private GestureDetector gestureDetector; 
    private ClickListener clickListener; 

    public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final ClickListener clickListener) { 
     this.clickListener = clickListener; 
     gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() { 
      @Override 
      public boolean onSingleTapUp(MotionEvent e) { 
       return true; 
      } 

      @Override 
      public void onLongPress(MotionEvent e) { 
       View child = recyclerView.findChildViewUnder(e.getX(), e.getY()); 
       if (child != null && clickListener != null) { 
        clickListener.onLongClick(child, recyclerView.getChildPosition(child)); 
       } 
      } 
     }); 
    } 

    @Override 
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) { 

     View child = rv.findChildViewUnder(e.getX(), e.getY()); 
     if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) { 
      clickListener.onClick(child, rv.getChildPosition(child)); 
     } 
     return false; 
    } 

    @Override 
    public void onTouchEvent(RecyclerView rv, MotionEvent e) { 
    } 

    @Override 
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { 

    } 


} 

public interface FragmentDrawerListener { 
    public void onDrawerItemSelected(View view, int position); 
} 

}

Вот мой MainActivity.java:-

public class MainActivity extends AppCompatActivity implements   FragmentDrawer.FragmentDrawerListener { 

private static String TAG = MainActivity.class.getSimpleName(); 

private Toolbar mToolbar; 
private FragmentDrawer drawerFragment; 

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

    mToolbar = (Toolbar) findViewById(R.id.toolbar); 

    setSupportActionBar(mToolbar); 
    getSupportActionBar().setDisplayShowHomeEnabled(true); 

    drawerFragment = (FragmentDrawer) 
      getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer); 
    drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar); 
    drawerFragment.setDrawerListener(this); 

    // display the first navigation drawer view on app launch 
    displayView(0); 
} 


@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_main, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 

    if(id == R.id.action_search){ 
     Toast.makeText(getApplicationContext(), "Search action is selected!", Toast.LENGTH_SHORT).show(); 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 

@Override 
public void onDrawerItemSelected(View view, int position) { 
    displayView(position); 
} 

private void displayView(int position) { 
    Fragment fragment = null; 
    String title = getString(R.string.app_name); 
    switch (position) { 
     case 0: 
      fragment = new HomeFragment(); 
      title = getString(R.string.title_home); 
      break; 
     case 1: 
      fragment = new FriendsFragment(); 
      title = getString(R.string.title_friends); 
      break; 
     case 2: 
      fragment = new MessagesFragment(); 
      title = getString(R.string.title_messages); 
      break; 
     default: 
      break; 
    } 

    if (fragment != null) { 
     FragmentManager fragmentManager = getSupportFragmentManager(); 
     FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
     fragmentTransaction.replace(R.id.container_body, fragment); 
     fragmentTransaction.commit(); 

     // set the toolbar title 
     getSupportActionBar().setTitle(title); 
    } 
} 

}

Мой текущий вид приложения ниже: -

, но я хочу многоуровневого подменю (более 3) в главном меню.

Я новичок в разработке Android, помогаю мне. Заранее спасибо

Answer 1

Вы можете использовать ExpandableListView вместо RecyclerView. Вот хороший учебник для его реализации.

Expandable ListView

И если вы действительно хотите использовать RecyclerView вы можете посмотреть на следующей библиотеке:

Expandable RecyclerView