我在片段上填充ListView时遇到了运行代码的问题。我在MainActivity类中创建了3个片段。问题是我想在我的片段上创建一个ListView然后显示它。问题是代码没有运行（查看catlog）。任何人都明白为什么：
public class DocumentItemFragment extends Fragment {
private OnFragmentInteractionListener mListener;
public DocumentItemFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
populateListView();
return inflater.inflate(R.layout.fragment_document_item, container, false);
}
private void populateListView() {
SQLiteHelper sqlh = new SQLiteHelper(getActivity().getBaseContext());
SQLiteDatabase db = sqlh.getWritableDatabase();
String query = "SELECT * FROM invdokg";
Cursor cursor = db.rawQuery(query, null);
String[] fromFieldNames = new String[]
{SQLiteHelper.KEY_ID,SQLiteHelper.KEY_NAZIV, SQLiteHelper.KEY_DATUM};
int[] toViewIDs = new int[]
{R.id.docItemId, R.id.docItemNaziv,R.id.docItemDate};
SimpleCursorAdapter myCursorAdapter;
myCursorAdapter = new SimpleCursorAdapter(getActivity().getBaseContext(), R.layout.docitem_layout, cursor, fromFieldNames, toViewIDs, 0);
ListView myList = (ListView) getActivity().findViewById(R.id.docListView);
myList.setAdapter(myCursorAdapter);
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (OnFragmentInteractionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated to
* the activity and potentially other fragments contained in that activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
public void onFragmentInteraction(Uri uri);
}
}
我的主要活动：
public class MainActivity extends Activity
implements BlankFragment.OnFragmentInteractionListener,
ExportImportFragment.OnFragmentInteractionListener,
HistoryFragment.OnFragmentInteractionListener{
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 TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this);
//String userTheme = settings.getString("pref_key_apptheme_list", "Theme_Dark");
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// 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
// InvDokG
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// ImportExport
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// History
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1), true, "22"));
// 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);
}
// SQL Lite**********************************************************************************
SQLiteHelper db = new SQLiteHelper(this);
/**
* CRUD Operations
* */
// add Books
db.addInvDokG(new InvDokG("Android Application Development Cookbook", new Date()));
db.addInvDokG(new InvDokG("Android Programming: The Big Nerd Ranch Guide", new Date()));
db.addInvDokG(new InvDokG("Learn Android App Development", new Date()));
// get all invdokgs
List<InvDokG> list = db.getAllInvDokGs();
// delete one invdokg
db.deleteInvDokG(list.get(0));
// get all invdokgs
db.getAllInvDokGs();
}
/**
* 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;
}
// Handle action bar actions click
Intent intent;
switch (item.getItemId()) {
case R.id.action_settings:
intent = new Intent(this, SettingsActivity.class);
startActivity(intent);
return true;
case R.id.action_about:
intent = new Intent(this, AboutActivity.class);
startActivity(intent);
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_settings).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:
// Intent i = new Intent(getBaseContext(), ItemListActivity.class);
// //i.putExtra("key", value); //Optional parameters
// startActivity(i);
fragment = new BlankFragment();
break;
case 1:
fragment = new ExportImportFragment();
break;
case 2:
fragment = new HistoryFragment();
break;
default:
break;
}
if (fragment != null) {
FragmentTransaction transaction=getFragmentManager().beginTransaction();
transaction.replace(R.id.frame_container,fragment);
transaction.addToBackStack(null);
transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
transaction.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);
}
@Override
public void onFragmentInteraction(Uri uri) {
// TODO Auto-generated method stub
}
}
我的mainactivity.xml：
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- Framelayout to display Fragments -->
<FrameLayout
android:id="@+id/frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!-- Listview to display slider menu -->
<ListView
android:id="@+id/list_slidermenu"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:choiceMode="singleChoice"
android:divider="@color/list_divider"
android:dividerHeight="1dp"
android:listSelector="@drawable/list_selector"
android:background="@color/list_background"/>
</android.support.v4.widget.DrawerLayout>
我的片段XML：
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<ListView
android:id="@+id/docListView"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</FrameLayout>
答案 0 :(得分：0)
你能详细解释一下你的问题吗？ 您可以在此处使用ListFragment作为基础。到目前为止，就我所见，你搞砸了布局（请为你的XML提供实际名称，以便其他人可以看到正在使用的资源）。
但有一件事：
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
populateListView();
return inflater.inflate(R.layout.fragment_document_item, container, false);
}
假设fragment_document_item是您的片段XML，您必须将ListView命名为 @android：id / list 。
你在catlog中遇到了什么错误？ 什么是R.layout.docitem_layout究竟是什么？
RGDS
Flizz