如果我删除listview上的项目，然后单击导航抽屉中的主菜单，列表视图将无法更新。
public class MainActivity extends Activity {
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[] navLogout;
String[] navMenuTitles;
TypedArray navMenuIcons;
ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(
R.array.nav_drawer_items_not_login);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
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], navMenuIcons
.getResourceId(0, -1)));
// login
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons
.getResourceId(1, -1)));
// register
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons
.getResourceId(2, -1)));
// classic brownies
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons
.getResourceId(3, -1)));
// cupcakes
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons
.getResourceId(3, -1)));
// cookies
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons
.getResourceId(3, -1)));
// feedback
navDrawerItems.add(new NavDrawerItem(navMenuTitles[6], navMenuIcons
.getResourceId(4, -1)));
// about
navDrawerItems.add(new NavDrawerItem(navMenuTitles[7], navMenuIcons
.getResourceId(5, -1)));
// Recycle the typed array
navMenuIcons.recycle();
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
// 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
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().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
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
// on first time display view for first nav item
displayView(0);
}
}
/**
* 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);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
Fragment fragment = null;
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_search:
Toast.makeText(this, "search selected", Toast.LENGTH_SHORT).show();
break;
case R.id.action_shoppingcart:
Toast.makeText(this, "shopping cart selected", Toast.LENGTH_SHORT)
.show();
fragment = new FeedbackFragment();
return true;
default:
break;
}
return true;
}
/* *
* 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_search).setVisible(!drawerOpen);
menu.findItem(R.id.action_shoppingcart).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
/**
* Diplaying fragment view for selected nav drawer list item
* */
private void displayView(int position) {
// update the main content by replacing fragments
Fragment fragment = null;
switch (position) {
case 0:
fragment = new HomeFragment();
break;
case 1:
fragment = new LoginFragment();
break;
case 2:
fragment = new RegisterFragment();
break;
case 3:
fragment = new ClassicBrowniesFragment();
break;
case 4:
fragment = new CupcakesFragment();
break;
case 5:
fragment = new CookiesFragment();
break;
case 6:
fragment = new FeedbackFragment();
break;
case 7:
fragment = new AboutFragment();
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getFragmentManager();
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");
}
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().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);
}
}
_只是提问，用更多的词语来描述你的问题总会有所帮助。如果真的没什么好说的的话。
public class HomeFragment extends Fragment implements OnItemClickListener {
String[] member_names;
TypedArray product_icons;
String[] statues;
String[] contactType;
List<RowItem> rowItems;
ListView mylistview;
CustomAdapter myadapter;
CustomAdapter newadapter;
public HomeFragment() {
}
View rootView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_home, container,
false);
rowItems = new ArrayList<RowItem>();
member_names = getResources().getStringArray(R.array.Member_names);
product_icons = getResources().obtainTypedArray(R.array.product_icons);
statues = getResources().getStringArray(R.array.statues);
for (int i = 0; i < member_names.length; i++) {
RowItem item = new RowItem(member_names[i],
product_icons.getResourceId(i, -1), statues[i]);
rowItems.add(item);
}
mylistview = (ListView) rootView.findViewById(R.id.list);
CustomAdapter adapter = new CustomAdapter(getActivity(), rowItems);
mylistview.setAdapter(adapter);
product_icons.recycle();
mylistview.setOnItemClickListener(this);
mylistview.setScrollingCacheEnabled(false);
mylistview.invalidateViews();
return rootView;
}
public void updateList(ArrayAdapter adapter){
mylistview = (ListView)rootView.findViewById(R.id.list);
mylistview.setAdapter(adapter);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String member_name = rowItems.get(position).getMember_name();
int product_icons = rowItems.get(position).getProfile_pic_id();
String status = rowItems.get(position).getStatus();
RowItem item = rowItems.get(position);
Intent intent = new Intent(getActivity().getApplicationContext(),
FeedbackFragment.class);
intent.putExtra(member_name, item.getMember_name());
intent.putExtra(status, item.getStatus());
rowItems.remove(item);
newadapter = new CustomAdapter(getActivity(), rowItems);
mylistview.setAdapter(newadapter);
newadapter.notifyDataSetChanged();
Toast.makeText(getActivity().getApplicationContext(),
"Added to Cart: " + member_name, Toast.LENGTH_SHORT).show();
}
}
答案 0 :(得分：0)
这里似乎有一个逻辑问题。您正在删除该项并更新listView，这是正确的，但您不会更改当前范围之外的实际列表List<RowItem> rowItems;。当您再次选择HomeFragment时，您正在创建一个新实例并且所有内容都会重置。
一种解决方案可能是将数据从更新的List<RowItem> rowItems;传递到下一个片段，以便您所做的更改会反映在其他片段中。
目前，您通过拼凑以下内容来创建List<RowItem> rowItems：
member_names = getResources().getStringArray(R.array.Member_names);
product_icons = getResources().obtainTypedArray(R.array.product_icons);
statues = getResources().getStringArray(R.array.statues);
但是，当您从列表中删除RowItem时，您不会更改这三个变量中的任何一个。因此，在初始化Fragment的新实例时，您使用相同的旧数据创建一个全新的RowItems列表。
简而言之，这里有两种可能的解决方案：
member_names，product_icons，statues RowItem列表