如何在navigationdrawer中添加子元素与可扩展列表视图

Question

请帮助我我是新的android开发我已经创建了一个导航抽屉，现在我想在此添加子元素如何添加。

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    mDrawerListView = (ListView) inflater.inflate(
      R.layout.fragment_navigation_drawer, container, false); 
    mDrawerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      selectItem(position); 
     } 
    }); 
    mDrawerListView.setAdapter(new ArrayAdapter<String>(
      getActionBar().getThemedContext(), 
      android.R.layout.simple_list_item_activated_1, 
      android.R.id.text1, 
      new String[]{ 
        getString(R.string.title_section1), 
        getString(R.string.title_section2), 
        getString(R.string.title_section3), 
        getString(R.string.title_section4), 
        getString(R.string.title_section5), 
        getString(R.string.title_section6), 
        getString(R.string.title_section7) 
      })); 
    mDrawerListView.setItemChecked(mCurrentSelectedPosition, true); 
    return mDrawerListView; 
} 

我想补充这些元素的子元素

Answer 1

可以实现这一目标有两种方式第一个1是通过注释@Sharanbasu Angadi解释 - 即使用菜单资源了详细的教程解释 - http://www.androidhive.info/2013/11/android-sliding-menu-using-navigation-drawer/

如果您想自定义列表视图项目和标题，请使用ExpandableListView内部NavigationView，如下面的代码所述，第二个选项非常重要。

activity_main.xml中

<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" 
android:fitsSystemWindows="true" 
tools:openDrawer="start"> 

<include 
    layout="@layout/app_bar_main" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" /> 

<android.support.design.widget.NavigationView 
    android:id="@+id/nav_view" 
    android:layout_width="wrap_content" 
    android:layout_height="match_parent" 
    android:layout_gravity="start"> 

    <RelativeLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 

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


     <ExpandableListView 
      android:id="@+id/nav_explistview" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_below="@+id/nav_header_main"/> 


    </RelativeLayout> 



</android.support.design.widget.NavigationView> 

MainActivity.java

package com.webege.rivu.navmenuexpandablelistview; 

import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.view.View; 
import android.support.design.widget.NavigationView; 
import android.support.v4.view.GravityCompat; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBarDrawerToggle; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.ExpandableListView; 

import com.webege.rivu.navmenuexpandablelistview.adapters.ExpandableListAdapter; 

import java.util.ArrayList; 
import java.util.HashMap; 

public class MainActivity extends AppCompatActivity { 

    private ExpandableListView nav_explistview; 

    ArrayList<String> listDataHeader = new ArrayList<String>();; 
    HashMap<String, ArrayList<String>> listDataChild = new HashMap<String, ArrayList<String>>();; 
    private ExpandableListAdapter listAdapter; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     FloatingActionButton fab = (FloatingActionButton) 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 = (DrawerLayout) findViewById(R.id.drawer_layout); 
     ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
       this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
     drawer.setDrawerListener(toggle); 
     toggle.syncState(); 

     NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); 

     nav_explistview = (ExpandableListView) findViewById(R.id.nav_explistview); 

     // preparing list data 
     populateListData(); 

     listAdapter = new ExpandableListAdapter(listDataHeader, listDataChild,this); 

     // setting list adapter 
     nav_explistview.setAdapter(listAdapter); 
    } 

    @Override 
    public void onBackPressed() { 
     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
     if (drawer.isDrawerOpen(GravityCompat.START)) { 
      drawer.closeDrawer(GravityCompat.START); 
     } else { 
      super.onBackPressed(); 
     } 
    } 

    private void populateListData() { 


     // Adding child data 
     listDataHeader.add("Heading 1"); 
     listDataHeader.add("Heading 2"); 
     listDataHeader.add("Heading 3"); 

     // Adding child data 
     ArrayList<String> heading1 = new ArrayList<String>(); 
     heading1.add("Sub Item 1"); 
     heading1.add("Sub Item 2"); 
     heading1.add("Sub Item 3"); 
     heading1.add("Sub Item 4"); 

     ArrayList<String> heading2 = new ArrayList<String>(); 
     heading2.add("Sub Item 1"); 
     heading2.add("Sub Item 2"); 

     ArrayList<String> heading3 = new ArrayList<String>(); 
     heading3.add("Sub Item 1"); 
     heading3.add("Sub Item 2"); 
     heading3.add("Sub Item 3"); 
     heading3.add("Sub Item 4"); 
     heading3.add("Sub Item 5"); 
     heading3.add("Sub Item 6"); 
     heading3.add("Sub Item 7"); 


     listDataChild.put(listDataHeader.get(0), heading1); // Header, Child data 
     listDataChild.put(listDataHeader.get(1), heading2); 
     listDataChild.put(listDataHeader.get(2), heading3); 
    } 


} 

所以，简单地添加内部NavigationView一个ExpandableListView和，但是你想初始化ExpandableListView通常情况下，你可以得到预期的结果。

欲了解更多关于ExpandableListView的文章，请查看AndroidHive。

Answer 2

试试这个方法来添加子元素ExpandableListview

public class MainActivity extends AppCompatActivity { 

    private DrawerLayout mDrawerLayout; 
    private ActionBarDrawerToggle mDrawerToggle; 
    private String mActivityTitle; 
    private String[] items; 

    private ExpandableListView mExpandableListView; 
    private ExpandableListAdapter mExpandableListAdapter; 
    private List<String> mExpandableListTitle; 
    private NavigationManager mNavigationManager; 

    private Map<String, List<String>> mExpandableListData; 

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

     mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
     mActivityTitle = getTitle().toString(); 

     mExpandableListView = (ExpandableListView) findViewById(R.id.navList); 
     mNavigationManager = FragmentNavigationManager.obtain(this); 

     initItems(); 

     LayoutInflater inflater = getLayoutInflater(); 
     View listHeaderView = inflater.inflate(R.layout.nav_header, null, false); 
     mExpandableListView.addHeaderView(listHeaderView); 

     mExpandableListData = ExpandableListDataSource.getData(this); 
     mExpandableListTitle = new ArrayList(mExpandableListData.keySet()); 

     addDrawerItems(); 
     setupDrawer(); 

     if (savedInstanceState == null) { 
      selectFirstItemAsDefault(); 
     } 

     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     getSupportActionBar().setHomeButtonEnabled(true); 
    } 

    private void selectFirstItemAsDefault() { 
     if (mNavigationManager != null) { 
      String firstActionMovie = getResources().getStringArray(R.array.actionFilms)[0]; 
      mNavigationManager.showFragmentAction(firstActionMovie); 
      getSupportActionBar().setTitle(firstActionMovie); 
     } 
    } 

    private void initItems() { 
     items = getResources().getStringArray(R.array.film_genre); 
    } 

    private void addDrawerItems() { 
     mExpandableListAdapter = new CustomExpandableListAdapter(this, mExpandableListTitle, mExpandableListData); 
     mExpandableListView.setAdapter(mExpandableListAdapter); 
     mExpandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() { 
      @Override 
      public void onGroupExpand(int groupPosition) { 
       getSupportActionBar().setTitle(mExpandableListTitle.get(groupPosition).toString()); 
      } 
     }); 

     mExpandableListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() { 
      @Override 
      public void onGroupCollapse(int groupPosition) { 
       getSupportActionBar().setTitle(R.string.film_genres); 
      } 
     }); 

     mExpandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() { 
      @Override 
      public boolean onChildClick(ExpandableListView parent, View v, 
             int groupPosition, int childPosition, long id) { 
       String selectedItem = ((List) (mExpandableListData.get(mExpandableListTitle.get(groupPosition)))) 
        .get(childPosition).toString(); 
       getSupportActionBar().setTitle(selectedItem); 

       if (items[0].equals(mExpandableListTitle.get(groupPosition))) { 
        mNavigationManager.showFragmentAction(selectedItem); 
       } else if (items[1].equals(mExpandableListTitle.get(groupPosition))) { 
        mNavigationManager.showFragmentComedy(selectedItem); 
       } else if (items[2].equals(mExpandableListTitle.get(groupPosition))) { 
        mNavigationManager.showFragmentDrama(selectedItem); 
       } else if (items[3].equals(mExpandableListTitle.get(groupPosition))) { 
        mNavigationManager.showFragmentMusical(selectedItem); 
       } else if (items[4].equals(mExpandableListTitle.get(groupPosition))) { 
        mNavigationManager.showFragmentThriller(selectedItem); 
       } else { 
        throw new IllegalArgumentException("Not supported fragment type"); 
       } 

       mDrawerLayout.closeDrawer(GravityCompat.START); 
       return false; 
      } 
     }); 
    } 

    private void setupDrawer() { 
     mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.drawer_open, R.string.drawer_close) { 

      /** Called when a drawer has settled in a completely open state. */ 
      public void onDrawerOpened(View drawerView) { 
       super.onDrawerOpened(drawerView); 
       getSupportActionBar().setTitle(R.string.film_genres); 
       invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() 
      } 

      /** Called when a drawer has settled in a completely closed state. */ 
      public void onDrawerClosed(View view) { 
       super.onDrawerClosed(view); 
       getSupportActionBar().setTitle(mActivityTitle); 
       invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu() 
      } 
     }; 

     mDrawerToggle.setDrawerIndicatorEnabled(true); 
     mDrawerLayout.setDrawerListener(mDrawerToggle); 
    } 

    @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); 
     mDrawerToggle.onConfigurationChanged(newConfig); 
    } 

    @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(); 

     // Activate the navigation drawer toggle 
     if (mDrawerToggle.onOptionsItemSelected(item)) { 
      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 
}