在 Navigation Drawer 的每个片段中实现不同的 Action Bar 项
Posted
技术标签:
【中文标题】在 Navigation Drawer 的每个片段中实现不同的 Action Bar 项【英文标题】：Implement a different Action Bar item in each fragment of Navigation Drawer 【发布时间】：2014-09-18 16:20:26 【问题描述】：我有一个带有片段的导航抽屉。在所有片段中，它在main.xml 中显示了一个按钮项。
现在，在一些片段中，我想实现 searchview。为此，我在菜单文件夹中创建了search.xml。
search.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/search"
android:title="@string/search_hint"
android:showAsAction="always"
android:actionViewClass="android.widget.SearchView" />
</menu>
我需要实施哪些措施来实现这一目标？
提前致谢
更新：MainActivity
public class MainActivity extends ActionBarActivity
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
SpannableString s = new SpannableString(getTitle());
s.setSpan(new TypefaceSpan(this, "BOOKOS.TTF"), 0, s.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
// Update the action bar title with the TypefaceSpan instance
ActionBar actionBar = getSupportActionBar();
actionBar.setTitle(s);
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], 1));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1],1));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], 1));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], 1));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], 1));
// What's hot, We will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], 1));
// Recycle the typed array
// navMenuIcons.recycle();
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
// enabling action bar app icon and behaving it as toggle button
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, //nav menu toggle icon
R.string.app_name, // nav drawer open - description for accessibility
R.string.app_name // nav drawer close - description for accessibility
)
@SuppressLint("NewApi")
public void onDrawerClosed(View view)
SpannableString s = new SpannableString(mTitle);
s.setSpan(new TypefaceSpan(getApplicationContext(), "BOOKOS.TTF"), 0, s.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
// Update the action bar title with the TypefaceSpan instance
ActionBar actionBar = getSupportActionBar();
actionBar.setTitle(s);
// getSupportActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
supportInvalidateOptionsMenu();
@SuppressLint("NewApi")
public void onDrawerOpened(View drawerView)
SpannableString s = new SpannableString(mDrawerTitle);
s.setSpan(new TypefaceSpan(getApplicationContext(), "BOOKOS.TTF"), 0, s.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
// Update the action bar title with the TypefaceSpan instance
ActionBar actionBar = getSupportActionBar();
actionBar.setTitle(s);
// getSupportActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
supportInvalidateOptionsMenu();
;
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null)
// on first time display view for first nav item
// displayView(0);
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
displayView(7);
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id)
// display view for selected nav drawer item
displayView(position);
/**
* Diplaying fragment view for selected nav drawer list item
* */
@SuppressLint("NewApi")
private void displayView(int position)
// update the main content by replacing fragments
Fragment fragment = null;
switch (position)
case 0:
fragment = new IntroductionFragment();
break;
case 1:
fragment = new PrefaceFragment();
break;
case 2:
fragment = new PreambleFragment();
break;
case 3:
fragment = new ContentsFragment();
break;
case 4:
fragment = new SchedulesFragment();
break;
case 5:
fragment = new AppendixFragment();
break;
case 6:
fragment = new AmendmentFragment();
break;
case 7:
fragment = new PhotoFragment();
break;
default:
break;
if (fragment != null)
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
else
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
ActionProvider mActionProvider;
@Override
public boolean onCreateOptionsMenu(Menu menu)
getMenuInflater().inflate(R.menu.main, menu);
// Find the share item
MenuItem shareItem = menu.findItem(R.id.action_share);
// Need to use MenuItemCompat to retrieve the Action Provider
mActionProvider = (ActionProvider)
MenuItemCompat.getActionProvider(shareItem);
return super.onCreateOptionsMenu(menu);
@Override
public boolean onOptionsItemSelected(MenuItem item)
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item))
return true;
// Handle action bar actions click
switch (item.getItemId())
case R.id.action_share:
Intent ints=new Intent(this,ShareActivity.class);
startActivity(ints);
return true;
default:
return super.onOptionsItemSelected(item);
/***
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu)
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_share).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
@SuppressLint("NewApi")
@Override
public void setTitle(CharSequence title)
SpannableString s = new SpannableString(mTitle);
s.setSpan(new TypefaceSpan(this, "BOOKOS.TTF"), 0, s.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
mTitle = title;
getSupportActionBar().setTitle(s);
/**
* 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);
我的片段类
public class IntroductionFragment extends Fragment
public IntroductionFragment()
setRetainInstance(true);
this.setHasOptionsMenu(true);
Button b;
TextView tv1;
@SuppressLint("NewApi")
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState)
View rootView = inflater.inflate(R.layout.fragment_introduction,container,false);
SpannableString s = new SpannableString("Introduction");
s.setSpan(new TypefaceSpan(getActivity(), "BOOKOS.TTF"), 0, s.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
Typeface typeface = Typeface.createFromAsset(getActivity().getAssets(), "BOOKOS.TTF");
tv1 = (TextView)rootView.findViewById(R.id.textView1);
tv1.setTypeface(typeface);
getActivity().supportInvalidateOptionsMenu();
return rootView;
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater)
Log.v("inside onCreateOptionsMenu","???????");
super.onCreateOptionsMenu(menu, inflater);
menu.clear();
getActivity().getMenuInflater().inflate(R.menu.search, menu);
@Override
public void onConfigurationChanged(Configuration newConfig)
super.onConfigurationChanged(newConfig);
LayoutInflater inflater = (LayoutInflater)getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.fragment_introduction, null);
ViewGroup rootView = (ViewGroup) getView();
rootView.removeAllViews();
rootView.addView(view);
这是日志
07-27 17:27:16.200: V/inside onCreateOptionsMenu(19875): ???????
07-27 17:27:16.210: W/dalvikvm(19875): threadid=1: thread exiting with uncaught exception (group=0x40d98450)
07-27 17:27:16.280: E/AndroidRuntime(19875): FATAL EXCEPTION: main
07-27 17:27:16.280: E/AndroidRuntime(19875): java.lang.NullPointerException
07-27 17:27:16.280: E/AndroidRuntime(19875): at com.vivekwarde.indianconstitution.MainActivity.onPrepareOptionsMenu(MainActivity.java:244)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.app.Activity.onPreparePanel(Activity.java:2494)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v4.app.FragmentActivity.onPrepareOptionsPanel(FragmentActivity.java:491)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v7.app.ActionBarActivity.superOnPrepareOptionsPanel(ActionBarActivity.java:240)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v7.app.ActionBarActivityDelegate.onPrepareOptionsPanel(ActionBarActivityDelegate.java:160)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v7.app.ActionBarActivity.onPrepareOptionsPanel(ActionBarActivity.java:212)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v4.app.FragmentActivity.onPreparePanel(FragmentActivity.java:480)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v7.app.ActionBarActivity.superOnPreparePanel(ActionBarActivity.java:236)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v7.app.ActionBarActivityDelegateICS.onPreparePanel(ActionBarActivityDelegateICS.java:155)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v7.app.ActionBarActivity.onPreparePanel(ActionBarActivity.java:204)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v7.app.ActionBarActivityDelegateICS$WindowCallbackWrapper.onPreparePanel(ActionBarActivityDelegateICS.java:290)
07-27 17:27:16.280: E/AndroidRuntime(19875): at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:425)
07-27 17:27:16.280: E/AndroidRuntime(19875): at com.android.internal.policy.impl.PhoneWindow.invalidatePanelMenu(PhoneWindow.java:751)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.app.Activity.invalidateOptionsMenu(Activity.java:2595)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v4.app.ActivityCompatHoneycomb.invalidateOptionsMenu(ActivityCompatHoneycomb.java:29)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v4.app.FragmentActivity.supportInvalidateOptionsMenu(FragmentActivity.java:648)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v7.app.ActionBarActivity.supportInvalidateOptionsMenu(ActionBarActivity.java:170)
07-27 17:27:16.280: E/AndroidRuntime(19875): at com.vivekwarde.indianconstitution.IntroductionFragment.onCreateView(IntroductionFragment.java:48)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:938)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:446)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.os.Handler.handleCallback(Handler.java:615)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.os.Handler.dispatchMessage(Handler.java:92)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.os.Looper.loop(Looper.java:137)
07-27 17:27:16.280: E/AndroidRuntime(19875): at android.app.ActivityThread.main(ActivityThread.java:4794)
07-27 17:27:16.280: E/AndroidRuntime(19875): at java.lang.reflect.Method.invokeNative(Native Method)
07-27 17:27:16.280: E/AndroidRuntime(19875): at java.lang.reflect.Method.invoke(Method.java:511)
07-27 17:27:16.280: E/AndroidRuntime(19875): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
07-27 17:27:16.280: E/AndroidRuntime(19875): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
07-27 17:27:16.280: E/AndroidRuntime(19875): at dalvik.system.NativeStart.main(Native Method)
【问题讨论】：
【参考方案1】：对于每个需要有菜单的片段：
在构造函数中调用this.setHasOptionsMenu(true)。
实现onCreateOptionsMenu(..) 和onOptionsItemSelected(..) 来处理该片段的菜单项。
在抽屉布局中：
每当您切换片段时，请在您的活动上调用invalidateOptionsMenu()。
如果您使用 support-v4 片段，请致电 supportInvalidateOptionsMenu()。 Android 版本在处理这些内容方面存在一些差异，因此请确保您分别在 Ice Cream Sandwich、Jelly Bean 和 KitKat 上进行测试。
【讨论】：
谢谢，我按照你说的修改了我的片段类，但是在实现你的 ans 之后，我在onPrepareOptionsMenu 中得到了空指针异常。我也很困惑在哪里打电话supportInvalidateOptionsMenu()。看看我的编辑，希望你能找出我的错误
可能是这个位：getActivity().getMenuInflater().inflate(R.menu.search, menu);，你应该用inflater.inflate(R.menu.search, menu);替换它。
如果你不发布异常堆栈跟踪，那么尝试调试它就没有什么意义了。
好的，现在跟随最顶层的堆栈帧到 MainActivity 的第 244 行。查看该行代码并查看该代码行上的哪些引用可能导致空指针异常。如果需要，添加空检查或以其他方式更改代码以避免取消引用空引用。
感谢在 onPrepareOptionsMenu 中为片段提供 if 条件和膨胀菜单以上是关于在 Navigation Drawer 的每个片段中实现不同的 Action Bar 项的主要内容，如果未能解决你的问题，请参考以下文章
Android Drawer - 使用 Navigation.findNavController() 导航到多个片段
java 导航抽屉切换活动而不是片段。字体：https：//stackoverflow.com/questions/19442378/navigation-drawer-to-switch-
Android Navigation Drawer Show Up Indicator for Lower Level Fragments
v-navigation-drawer 在窗口调整大小时掉入失控循环