导航抽屉操作栏按钮不起作用 [英] Navigation Drawer ActionBar button not working

问题描述

我正在开发一个 android 项目，我正在尝试使用 http://developer.android.com/training/implementing-navigation/nav-drawer.html.

I am working on an android project and I'm trying to integrate the new Navigation Drawer using the example from http://developer.android.com/training/implementing-navigation/nav-drawer.html.

它主要工作除了一件事，操作栏向上按钮不显示菜单，但如果我从边缘在主活动屏幕上滑动手指，菜单就会出现，所以我知道没有任何问题实际的菜单，它只是操作栏按钮.

Its mostly working except for one thing, the action bar up button doesn't display the menu, but if I swipe my finger over the main activity screen from the edge, then the menu appears, so I know there's nothing wrong with the actual menu, its just the action bar button.

下面是代码

public class MainActivity extends Activity {

    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    private ActionBarDrawerToggle mDrawerToggle;

    private CharSequence mTitle;
    private CharSequence mDrawerTitle;
    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);


        MenuItemAdapter menuAdapter = new MenuItemAdapter(this);

        menuAdapter.add(new MenuItem("Hello"));
        menuAdapter.add(new MenuItem("World"));
        menuAdapter.add(new MenuItem("Parsnips"));
        menuAdapter.add(new MenuItem("Turnips"));

        mDrawerList.setAdapter(menuAdapter);

        mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

        getActionBar().setDisplayHomeAsUpEnabled(true);
        getActionBar().setHomeButtonEnabled(true);

        mDrawerToggle = new ActionBarDrawerToggle(
                this,
                mDrawerLayout,
                R.drawable.ic_drawer, 
                R.string.drawer_open,
                R.string.drawer_closed)
        {
            public void onDrawerClosed(View view)
            {
                getActionBar().setTitle(mTitle);
                invalidateOptionsMenu();
            }

            public void onDrawerOpened(View drawerView)
            {
                getActionBar().setTitle(mDrawerTitle);
                invalidateOptionsMenu();
            }
        };

        mDrawerLayout.setDrawerListener(mDrawerToggle);
        if (savedInstanceState ==  null)
        {
            selectItem(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.main, menu);
        return true;
    }

    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

        android.app.Fragment fragment = new PlanetFragment();
        Bundle args = new Bundle();
        args.putInt(PlanetFragment.ARGS_PLANET_NUMBER, position);
        fragment.setArguments(args);

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

        mDrawerList.setItemChecked(position, true);
        setTitle(mPlanetTitles[position]);
        mDrawerLayout.closeDrawer(mDrawerList);
    }

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

    @Override
    protected void onPostCreate(Bundle savedInstanceState)
    {
        super.onPostCreate(savedInstanceState);
        mDrawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig)
    {
        super.onConfigurationChanged(newConfig);
        mDrawerToggle.onConfigurationChanged(newConfig);
    }

    public static class PlanetFragment extends android.app.Fragment
    {
        public static final String ARGS_PLANET_NUMBER = "planet_number";

        public PlanetFragment()
        {

        }

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

            //((TextView)rootView.findViewById(R.id.fragment_text_view)).setText(planet);
            getActivity().setTitle("Planet: " + planet);
            return rootView;
        }
    }

    private class MenuItem
    {
        public String menuName;

        public MenuItem(String menuName)
        {
            this.menuName = menuName;
        }
    }

    public class MenuItemAdapter extends ArrayAdapter<MenuItem>
    {
        public MenuItemAdapter (Context context)
        {
            super(context,0);
        }

        public View getView (int position, View convertView, ViewGroup parent)
        {
            convertView = null;
            if (convertView == null)
            {
                convertView = LayoutInflater.from(getContext()).inflate(R.layout.row_menu_item, null);
            }

            /*TextView title = (TextView)convertView.findViewById(R.id.row_title);
            title.setText(getItem(position).menuName);
            title.setVisibility(View.VISIBLE);*/

            EditText title = (EditText)convertView.findViewById(R.id.row_edittext);
            title.setHint(getItem(position).menuName);
            title.setVisibility(View.VISIBLE);

            return convertView;
        }
    }
}

感谢您提供的任何帮助.

Thanks for any help you can provide.

推荐答案

你忘了实现 onOptionsItemSelected

You forgot to implement onOptionsItemSelected

这就是神奇发生的地方:

This is where the magic happens:

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Pass the event to ActionBarDrawerToggle, if it returns
        // true, then it has handled the app icon touch event
        if (mDrawerToggle.onOptionsItemSelected(item)) {
          return true;
        }
        // Handle your other action bar items...

        return super.onOptionsItemSelected(item);
    }

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