如何通過導航抽屜導航到不同的活動

Question

我有一個問題，我知道如何添加導航抽屜。但是，我不知道如何將我的活動與它聯繫起來，例如如果我點擊抽屜式導航欄上的幫助按鈕，我該如何將它帶到幫助頁面？

這是我的MainActivity：

public class MainActivity extends ActionBarActivity implements 
    NavigationDrawerFragment.NavigationDrawerCallbacks { 

/** 
* Fragment managing the behaviours, interactions and presentation of the 
* navigation drawer. 
*/ 
private NavigationDrawerFragment mNavigationDrawerFragment; 

/** 
* Used to store the last screen title. For use in 
* {@link #restoreActionBar()}. 
*/ 
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) { 

    switch (position) { 
    case 0: { 
     Intent intent = new Intent(MainActivity.this, Bmi.class); 
     startActivity(intent); 
     break; 
    } 
    case 1:{ 
     Intent intent = new Intent(MainActivity.this, CC.class); 
     startActivity(intent); 
     break; 
    } 
    case 2:{ 
     // if this position is to add fragment 
     FragmentManager fragmentManager = getSupportFragmentManager(); 
fragmentManager 
     .beginTransaction() 
     .replace(R.id.container, 
       PlaceholderFragment.newInstance(position + 1)).commit(); 
     break; 
    } 
    default: 
     break;   

    } 
    } 



public void onSectionAttached(int number) { 
    switch (number) { 
    case 1: 
     mTitle = getString(R.string.title_BMI); 
     break; 
    case 2: 
     mTitle = getString(R.string.title_CC); 
     break; 
    case 3: 
     mTitle = getString(R.string.title_W2E); 
     break; 
    case 4: 
     mTitle = getString(R.string.title_FC); 
     break; 
    case 5: 
     mTitle = getString(R.string.title_FB); 
     break; 
    case 6: 
     mTitle = getString(R.string.title_LOG); 
     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); 
} 

/** 
* A placeholder fragment containing a simple view. 
*/ 
public static class PlaceholderFragment extends Fragment { 
    /** 
    * The fragment argument representing the section number for this 
    * fragment. 
    */ 
    private static final String ARG_SECTION_NUMBER = "section_number"; 

    /** 
    * Returns a new instance of this fragment for the given 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); 
     TextView textView = (TextView) rootView 
       .findViewById(R.id.section_label); 
     textView.setText(Integer.toString(getArguments().getInt(
       ARG_SECTION_NUMBER))); 
     return rootView; 
    } 

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

    } 

，這是我的導航抽屜片段

public class NavigationDrawerFragment extends Fragment { 

/** 
* Remember the position of the selected item. 
*/ 
private static final String STATE_SELECTED_POSITION = "selected_navigation_drawer_position"; 

/** 
* Per the design guidelines, you should show the drawer on launch until the user manually 
* expands it. This shared preference tracks this. 
*/ 
private static final String PREF_USER_LEARNED_DRAWER = "navigation_drawer_learned"; 

/** 
* A pointer to the current callback instance (the Activity). 
*/ 
private NavigationDrawerCallbacks mCallbacks; 

/** 
* Helper component that ties the action bar to the navigation drawer. 
*/ 
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_BMI), 
        getString(R.string.title_CC), 
        getString(R.string.title_W2E), 
        getString(R.string.title_FC), 
        getString(R.string.title_FB), 
        getString(R.string.title_LOG), 
      })); 
    mDrawerListView.setItemChecked(mCurrentSelectedPosition, true); 
    return mDrawerListView; 
} 

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

/** 
* Users of this fragment must call this method to set up the navigation drawer interactions. 
* 
* @param fragmentId The android:id of this fragment in its activity's layout. 
* @param drawerLayout The DrawerLayout containing this fragment's UI. 
*/ 
public void setUp(int fragmentId, DrawerLayout drawerLayout) { 
    mFragmentContainerView = getActivity().findViewById(fragmentId); 
    mDrawerLayout = drawerLayout; 

    // set a custom shadow that overlays the main content when the drawer opens 
    mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); 
    // set up the drawer's list view with items and click listener 

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

    // ActionBarDrawerToggle ties together the the proper interactions 
    // between the navigation drawer and the action bar app icon. 
    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, /* "open drawer" description for accessibility */ 
      R.string.navigation_drawer_close /* "close drawer" description for accessibility */ 
    ) { 
     @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); 
    } 
    // for the numbers bottom code fix now 
    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(), "Dont Forget To Rate The App", Toast.LENGTH_SHORT).show(); 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 

/** 
* Per the navigation drawer design guidelines, updates the action bar to show the global app 
* 'context', rather than just what's in the current screen. 
*/ 
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(); 
} 

/** 
* Callbacks interface that all activities using this fragment must implement. 
*/ 
public static interface NavigationDrawerCallbacks { 
    /** 
    * Called when an item in the navigation drawer is selected. 
    */ 
    void onNavigationDrawerItemSelected(int position); 
} 

}

Answer 1

您需要處理抽屜項的點擊，在onNavigationDrawerItemSelected 。當用戶選擇抽屜清單中的項目時，將調用onNavigationDrawerItemSelected，根據項目位置，您可以啓動活動或添加/替換MainActivity中的片段。

@Override 
public void onNavigationDrawerItemSelected(int position) { 
    // depending on the position in your drawer list change this 
    switch (position) { 
     case 0: { 
      Intent intent = new Intent(MainActivity.this, HelpActivity.class); 
      startActivity(intent); 
      break; 
     } 
     case 1:{ 
      Intent intent = new Intent(MainActivity.this, SettingsActivity.class); 
      startActivity(intent); 
      break; 
     } 
     case 2:{ 
      // if this position is to add fragment 
      FragmentManager fragmentManager = getSupportFragmentManager(); 
    fragmentManager 
      .beginTransaction() 
      .replace(R.id.container, 
        PlaceholderFragment.newInstance(position + 1)).commit(); 
      break; 
     } 
     default: 
      break;   

}