Question

我想在Navigation Drawer this中添加下拉菜单。

点击左侧图标后，显示为this。

可以为此做些什么？

Answer 1

这是带有ExpandableListview的导航抽屉

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);
    }
}

有关详情，请参阅此https://github.com/msahakyan/expandable-navigation-drawer

在导航栏中添加滑块菜单

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