Android 如何创建新片段并使用导航抽屉编辑它们？

我试过很多东西，但都不管用。我有如下的导航抽屉，我如何创建新的片段，并通过点击int抽屉列表中的项目来显示它们？下面是我的导航抽屉Main活动和导航抽屉的代码。请帮忙

MainActivity.java

public class MainActivity extends ActionBarActivity
    implements NavigationDrawerFragment.NavigationDrawerCallbacks {


private NavigationDrawerFragment mNavigationDrawerFragment;

private CharSequence mTitle;

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

    mNavigationDrawerFragment = (NavigationDrawerFragment)
            getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
    mTitle = getTitle();

    // Set up the drawer.
    mNavigationDrawerFragment.setUp(
            R.id.navigation_drawer,
            (DrawerLayout) findViewById(R.id.drawer_layout));
}

@Override
public void onNavigationDrawerItemSelected(int position) {
    // update the main content by replacing fragments
    FragmentManager fragmentManager = getSupportFragmentManager();
    fragmentManager.beginTransaction()
            .replace(R.id.container, PlaceholderFragment.newInstance(position + 1))
            .commit();
}

public void onSectionAttached(int number) {
    switch (number) {
        case 1:
            mTitle = getString(R.string.title_forme);
            break;
        case 2:
            mTitle = getString(R.string.title_mytwyst);
            break;
        case 3:
            mTitle = getString(R.string.title_nearby);
            break;
    }
}

public void restoreActionBar() {
    ActionBar actionBar = getSupportActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
    actionBar.setDisplayShowTitleEnabled(true);
    actionBar.setTitle(mTitle);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    if (!mNavigationDrawerFragment.isDrawerOpen()) {
        // Only show items in the action bar relevant to this screen
        // if the drawer is not showing. Otherwise, let the drawer
        // decide what to show in the action bar.
        getMenuInflater().inflate(R.menu.main, menu);
        restoreActionBar();
        return true;
    }
    return super.onCreateOptionsMenu(menu);
}

@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();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

public static class PlaceholderFragment extends Fragment {

    private static final String ARG_SECTION_NUMBER = "section_number";

    public static PlaceholderFragment newInstance(int sectionNumber) {
        PlaceholderFragment fragment = new PlaceholderFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_SECTION_NUMBER, sectionNumber);
        fragment.setArguments(args);
        return fragment;
    }

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);
        return rootView;
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        ((MainActivity) activity).onSectionAttached(
                getArguments().getInt(ARG_SECTION_NUMBER));
    }
}

}

NavigationDrawerFragment.java

 public class NavigationDrawerFragment extends Fragment {


private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position";


private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned";

private NavigationDrawerCallbacks mCallbacks;

private ActionBarDrawerToggle mDrawerToggle;

private DrawerLayout mDrawerLayout;
private ListView mDrawerListView;
private View mFragmentContainerView;

private int mCurrentSelectedPosition = 0;
private boolean mFromSavedInstanceState;
private boolean mUserLearnedDrawer;

public NavigationDrawerFragment() {
}

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

    // Read in the flag indicating whether or not the user has demonstrated awareness of the
    // drawer. See PREF_USER_LEARNED_DRAWER for details.
    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(getActivity());
    mUserLearnedDrawer = sp.getBoolean(PREF_USER_LEARNED_DRAWER, false);

    if (savedInstanceState != null) {
        mCurrentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION);
        mFromSavedInstanceState = true;
    }

    // Select either the default item (0) or the last selected item.
    selectItem(mCurrentSelectedPosition);
}

@Override
public void onActivityCreated (Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    // Indicate that this fragment would like to influence the set of actions in the action bar.
    setHasOptionsMenu(true);
}

@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_1,
            android.R.id.text1,
            new String[]{
                    getString(R.string.title_forme),
                    getString(R.string.title_mytwyst),
                    getString(R.string.title_nearby),
            }));
    mDrawerListView.setItemChecked(mCurrentSelectedPosition, true);
    return mDrawerListView;
}

public boolean isDrawerOpen() {
    return mDrawerLayout != null && mDrawerLayout.isDrawerOpen(mFragmentContainerView);
}

public void setUp(int fragmentId, DrawerLayout drawerLayout) {
    mFragmentContainerView = getActivity().findViewById(fragmentId);
    mDrawerLayout = drawerLayout;
    mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);

    ActionBar actionBar = getActionBar();
    actionBar.setDisplayHomeAsUpEnabled(true);
    actionBar.setHomeButtonEnabled(true);

    mDrawerToggle = new ActionBarDrawerToggle(
            getActivity(),                    /* host Activity */
            mDrawerLayout,                    /* DrawerLayout object */
            R.drawable.ic_drawer,             /* nav drawer image to replace 'Up'caret */
            R.string.navigation_drawer_open, 
            R.string.navigation_drawer_close  
    ) {
        @Override
        public void onDrawerClosed(View drawerView) {
            super.onDrawerClosed(drawerView);
            if (!isAdded()) {
                return;
            }

            getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
        }

        @Override
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            if (!isAdded()) {
                return;
            }

            if (!mUserLearnedDrawer) {
                // The user manually opened the drawer; store this flag to prevent auto-showing
                // the navigation drawer automatically in the future.
                mUserLearnedDrawer = true;
                SharedPreferences sp = PreferenceManager
                        .getDefaultSharedPreferences(getActivity());
                sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).commit();
            }

            getActivity().supportInvalidateOptionsMenu(); // calls onPrepareOptionsMenu()
        }
    };

    // If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
    // per the navigation drawer design guidelines.
    if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
        mDrawerLayout.openDrawer(mFragmentContainerView);
    }

    // Defer code dependent on restoration of previous instance state.
    mDrawerLayout.post(new Runnable() {
        @Override
        public void run() {
            mDrawerToggle.syncState();
        }
    });

    mDrawerLayout.setDrawerListener(mDrawerToggle);
}

private void selectItem(int position) {
    mCurrentSelectedPosition = position;
    if (mDrawerListView != null) {
        mDrawerListView.setItemChecked(position, true);
    }
    if (mDrawerLayout != null) {
        mDrawerLayout.closeDrawer(mFragmentContainerView);
    }
    if (mCallbacks != null) {
        mCallbacks.onNavigationDrawerItemSelected(position);
    }
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        mCallbacks = (NavigationDrawerCallbacks) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException("Activity must implement NavigationDrawerCallbacks.");
    }
}

@Override
public void onDetach() {
    super.onDetach();
    mCallbacks = null;
}

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putInt(STATE_SELECTED_POSITION, mCurrentSelectedPosition);
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    // Forward the new configuration the drawer toggle component.
    mDrawerToggle.onConfigurationChanged(newConfig);
}

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    // If the drawer is open, show the global app actions in the action bar. See also
    // showGlobalContextActionBar, which controls the top-left area of the action bar.
    if (mDrawerLayout != null && isDrawerOpen()) {
        inflater.inflate(R.menu.global, menu);
        showGlobalContextActionBar();
    }
    super.onCreateOptionsMenu(menu, inflater);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (mDrawerToggle.onOptionsItemSelected(item)) {
        return true;
    }

    if (item.getItemId() == R.id.action_example) {
        Toast.makeText(getActivity(), "Example action.", Toast.LENGTH_SHORT).show();
        return true;
    }

    return super.onOptionsItemSelected(item);
}
private void showGlobalContextActionBar() {
    ActionBar actionBar = getActionBar();
    actionBar.setDisplayShowTitleEnabled(true);
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
    actionBar.setTitle(R.string.app_name);
}

private ActionBar getActionBar() {
    return ((ActionBarActivity) getActivity()).getSupportActionBar();
}
public static interface NavigationDrawerCallbacks {

    void onNavigationDrawerItemSelected(int position);
}

公共类NavigationDrawerFragment扩展片段{
私有静态最终字符串状态\u SELECTED\u POSITION=“SELECTED\u navigation\u drawer\u POSITION”；
私有静态最终字符串PREF\u USER\u LEARNED\u DRAWER=“导航\u DRAWER\u LEARNED”；
专用导航抽屉回调mCallbacks；
私有操作bardrawertoggle mDrawerToggle；
私人抽屉布局mDrawerLayout；
私有列表视图mDrawerListView；
私有视图MFFragmentContainerView；
private int mCurrentSelectedPosition=0；
私有布尔值mFromSavedInstanceState；
私有布尔mUserLearnedDrawer；
公共导航抽屉碎片（）{
}
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
//读入标志，指示用户是否已意识到
//抽屉。有关详细信息，请参阅首选用户抽屉。
SharedReferences sp=PreferenceManager.GetDefaultSharedReferences（getActivity（））；
mUserLearnedDrawer=sp.getBoolean（预用户已学习抽屉，false）；
如果（savedInstanceState！=null）{
mCurrentSelectedPosition=savedInstanceState.getInt（STATE\u SELECTED\u POSITION）；
mFromSavedInstanceState=true；
}
//选择默认项（0）或最后选定的项。
selectItem（mCurrentSelectedPosition）；
}
@凌驾
已创建ActivityState上的公共无效（Bundle savedInstanceState）{
super.onActivityCreated（savedInstanceState）；
//指示此片段希望影响操作栏中的操作集。
设置选项菜单（真）；
}
@凌驾
创建视图上的公共视图（布局、充气机、视图组容器、，
Bundle savedInstanceState）{
mDrawerListView=（ListView）充气器。充气(
R.layout.fragment_导航_抽屉、容器、假）；
mDrawerListView.setOnItemClickListener（新的AdapterView.OnItemClickListener（）{
@凌驾
public void onItemClick（AdapterView父对象、视图、整型位置、长id）{
选择项目（位置）；
}
});
mDrawerListView.setAdapter（新阵列适配器）(
getActionBar（）.getThemedContext（），
android.R.layout.simple\u list\u item\u 1，
android.R.id.text1，
新字符串[]{
getString（R.string.title_forme），
getString（R.string.title\u mytwyst），
getString（R.string.title_附近），
}));
mDrawerListView.setItemChecked（mCurrentSelectedPosition，true）；
返回mDrawerListView；
}
公共布尔值isDrawerOpen（）{
返回mDrawerLayout！=null&&mDrawerLayout.isDrawerOpen（MFFragmentContainerView）；
}
公共空白设置（int fragmentId、抽屉布局抽屉布局）{
MFFragmentContainerView=getActivity（）.findViewById（fragmentId）；
mDrawerLayout=抽屉式布局；
mDrawerLayout.setDrawerShadow（R.drawable.drawer\u shadow，GravityCompat.START）；
ActionBar ActionBar=getActionBar（）；
actionBar.setDisplayHomeAsUpEnabled（true）；
actionBar.setHomeButtonEnabled（真）；
mDrawerToggle=新操作bardrawertoggle(
getActivity（），/*主机活动*/
mDrawerLayout，/*抽屉布局对象*/
R.drawable.ic_抽屉，/*导航抽屉图像替换“Up”插入符号*/
R.string.navigation\u抽屉\u打开，
R.string.navigation\u drawer\u close
) {
@凌驾
图纸上的公共空白已关闭（视图抽屉视图）{
super.onDrawerClosed（抽屉视图）；
如果（！isAdded（））{
返回；
}
getActivity（）.SupportInvalidateOptions菜单（）；//调用PrepareOptions菜单（）
}
@凌驾
打开图纸上的公共空白（视图抽屉视图）{
super.onDrawerOpened（抽屉视图）；
如果（！isAdded（））{
返回；
}
如果（！mUserLearnedDrawer）{
//用户手动打开抽屉；存储此标志以防止自动显示
//导航抽屉将来会自动打开。
mUserLearnedDrawer=真；
SharedReferences sp=首选项管理器
.GetDefaultSharedReferences（getActivity（））；
sp.edit（）.putBoolean（PREF_USER_learn_DRAWER，true）.commit（）；
}
getActivity（）.SupportInvalidateOptions菜单（）；//调用PrepareOptions菜单（）
}
};
//如果用户尚未“了解”抽屉，请打开抽屉，将其介绍给抽屉，
//根据导航抽屉设计指南。
如果（！mUserLearnedDrawer&！mFromSavedInstanceState）{
mDrawerLayout.openDrawer（MFFragmentContainerView）；
}
//根据先前实例状态的恢复延迟代码。
mDrawerLayout.post（新的Runnable（）{
@凌驾
公开募捐{
mDrawerToggle.syncState（）；
}
});
mDrawerLayout.setDrawerListener（mDrawerToggle）；
}
私有void selectItem（内部位置）{
mCurrentSelectedPosition=位置；
if（mDrawerListView！=null）{
mDrawerListView.setItemChecked（位置，true）；
}
if（mDrawerLayout！=null）{
mDrawerLayout.closeDrawer（MFFragmentContainerView）；
}
如果（mCallbacks！=null）{
mCallbacks.onNavigationDrawerItemSelected（位置）；
}
}
@凌驾
公共事务主任（活动）{
超级转速计（活动）；
试一试{
mCallbacks=（NavigationDrawerCallbacks）活动；
}catch（ClassCastException e）{
抛出新的ClassCastException（“活动必须实现导航
@Override
public void onNavigationDrawerItemSelected(int position) {
    // update the main content by replacing fragments
    FragmentManager fragmentManager = getSupportFragmentManager();

Fragment newFragment= null;
if(position == 1){
newFragment = new SomeFragment1();

}else {
newFragment = new SomeFragment2();

}
    fragmentManager.beginTransaction()
            .replace(R.id.container,newFragment).commit();
}