带有活动的导航抽屉 - 基本概念

Question

我有一个在过去几天无法解决的基本问题（即使在谷歌搜索和 SOing 中进行了许多示例/解释之后）。

我有 5 个不同的 Activity ，每个 Activity 都是独立的，每个 Activity 都有自己的布局文件。现在，我想将 Navigation Drawer 添加为我的应用程序菜单。

据我所知，2个推荐的方法是：

1) 将这 5 个活动合并为一个 MainActivity，并使用 5 个片段加载 5 个不同的布局。但是我很难将这 5 个合并为 1 个。如果我将所有方法都加载到一个 Activity 中，会不会有任何性能问题？

2) 拥有一个包含抽屉的 BaseActivity，并将所有其他活动扩展到 Base Activity。但是我已将所有活动扩展到 NavDrawer 类（包含抽屉），但无法正常工作。单独的抽屉工作正常（仅当我运行 NavDrawer 时）。我是否需要对现有活动的布局 xml 进行任何更改？

很抱歉，如果这是非常基本的，但我在两天内未能掌握这个概念后发布此内容！

如果你愿意，我可以附上我的代码，但抽屉代码是基本的东西，根据教程。

谢谢，

我正在使用的参考资料：
1)http://developer.android.com/training/implementing-navigation/nav-drawer.html 2)http://www.androidhive.info/2013/11/android-sliding-menu-using-navigation-drawer/

Answer 1

我可以建议您将ViewPager 与actionbar tabs 一起使用。因为在 viewpager 的帮助下，所有五个片段都可以看到同一个导航抽屉。为了提高效率，ViewPager 创建当前页面，此外它还始终准备您的下一页和上一页。以便在用户滑动页面时显示内容的速度更快。我总是遵循相同的，我不认为它是低效的。

我的一个应用程序的代码 sn-p 如下：

public class MainActivity extends ActionBarActivity {


    String[] titles;

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

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

    public PagerTabStrip titleStrip;


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

            viewPager = (ViewPager) findViewById(R.id.pager);

            TitleAdapter titleAdapter = new TitleAdapter(getSupportFragmentManager());
            viewPager.setAdapter(titleAdapter);
            viewPager.setCurrentItem(0);

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

            mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
            // sets up the drawer's list view with items and click listener
            mDrawerList.setAdapter(new ArrayAdapter<String>(this, R.layout.drawer_list_item, mListTitles));
            mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

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


            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)
                {
                    getSupportActionBar().setTitle(mTitle);

                }

                public void onDrawerOpened(View drawerView)
                {
                    getSupportActionBar().setTitle(mDrawerTitle);

                }
            };
            mDrawerLayout.setDrawerListener(mDrawerToggle);

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


        }

        @Override
        public boolean onCreateOptionsMenu(Menu menu) {

            getMenuInflater().inflate(R.menu.main, menu);
            return true;
        }

        @Override
        public boolean onPrepareOptionsMenu(Menu menu)
        {

            boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
            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;
            }
            else{

                return false;
            }
        }


        class TitleAdapter extends FragmentPagerAdapter{
            private String titles[] = new String[]{"Expenses","Savings","Income"};
            private Fragment frags[] = new Fragment[titles.length]; 

            public TitleAdapter(FragmentManager fm) {
                    super(fm);
                    frags[0] = new Fragment1();
                    frags[1] = new Fragment2();
                    frags[2] = new Fragment3();
            }

            @Override
            public CharSequence getPageTitle (int position){
                    Log.v("TitleAdapter - getPageTitle=", titles[position]);
                    return titles[position];
            }

            @Override
            public Fragment getItem(int position) {
                    Log.v("TitleAdapter - getItem=", String.valueOf(position));
                    return frags[position];
            }

            @Override
            public int getCount() {
                    return frags.length;
            }

    }



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

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


    }