我有一个带有碎片的导航抽屉。在所有片段中,它在main.xml
中显示了一个分享按钮项。
默认片段为PhotoFragment
,显示main.xml
&的共享项目在导航抽屉中单击IntroductionFragment
时,操作栏应显示search.xml
MainActivity.java
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) {
if(Flag.f==0)
{
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);
}
else
{
getMenuInflater().inflate(R.menu.search, menu);
// Find the share item
MenuItem searchItem = menu.findItem(R.id.search);
// Need to use MenuItemCompat to retrieve the Action Provider
mActionProvider = (ActionProvider)
MenuItemCompat.getActionProvider(searchItem);
// When using the support library, the setOnActionExpandListener() method is
// static and accepts the MenuItem object as an argument
MenuItemCompat.setOnActionExpandListener(searchItem, new OnActionExpandListener() {
@Override
public boolean onMenuItemActionCollapse(MenuItem item) {
// Do something when collapsed
return true; // Return true to collapse action view
}
@Override
public boolean onMenuItemActionExpand(MenuItem item) {
// Do something when expanded
return true; // Return true to expand action view
}
});
}
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);
if(Flag.f==0)
menu.findItem(R.id.action_share).setVisible(!drawerOpen);
else
menu.findItem(R.id.search).setVisible(!drawerOpen);
Flag.f=0;
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);
}
}
这就是我实现片段类来从search.xml
获取searchView的方法,我无法在操作栏中显示它
public class IntroductionFragment extends Fragment{
public IntroductionFragment(){
setRetainInstance(true);
this.setHasOptionsMenu(true);
}
@SuppressLint("NewApi")
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState)
{
View rootView = inflater.inflate(R.layout.fragment_introduction,container,false);
...
...
getActivity().supportInvalidateOptionsMenu();
return rootView;
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
Log.v("inside onCreateOptionsMenu","???????");
Flag.f=1;
super.onCreateOptionsMenu(menu, inflater);
menu.clear();
inflater.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);
}
}
Search.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:yourapp="http://schemas.android.com/apk/res-auto" >
<item
android:id="@+id/search"
android:title="@string/search_hint"
android:showAsAction="always|collapseActionView"
yourapp:actionViewClass="android.support.v7.widget.SearchView" />
</menu>
这就是我试过的!
使用menu.clear()
清除main.xml
&amp;的项目相反,我没有在IntroductionFragment中看到searchview
请确定我应该怎么做以获得我想要的结果。
如果您发现我的问题不清楚,请随意发表评论!
提前致谢!
答案 0 :(得分:3)
在该行,NullPointerException意味着无法找到ID为R.id.action_share的MenuItem。这是正常的,因为您的IntroductionFragment在其onCreateOptionsMenu()方法中调用:
menu.clear()
将从菜单中删除所有项(包括之前添加的主要R.id.action_share MenuItem),使findItem()方法返回null。解决方案是删除该行menu.clear()(你应该解释为什么使用clear())。
答案 1 :(得分:0)
你可以做的另一个选择,因为我遇到与SearchView相同的问题(减去代码丑陋的事实)是做这样的事情。我今晚稍后会有一些补丁来更新这个项目,但它是一个很好的基础。
您基本上使用AutoCompleteTextView或EditText作为搜索字段创建actionLayout,并且您可以手动处理打开和关闭对话框所需的所有操作。
https://github.com/sinfonianartist/AutoCompleteActionBarDemo