我在使用片段填充列表视图时遇到问题,我有一个名为PagesFragment的片段类,该片段类扩展了Fragment.。我还有一个MainActivity,可以使用菜单在我的片段之间切换。
我相信我需要扩展ListFragment以便在Fragment'PagesFragment'中填充列表视图,但是当我更改所有类以扩展ListFragment,并在MainActivity中将案例更改为ListFragement时,尝试运行时出现错误我的代码:
您的内容必须具有一个ID属性为“ android.R.id.list”的ListView
注意:即使将我的id属性更改为正确的值,我仍然会收到错误消息。
切换片段的代码-使用SideMenu
/**
* Diplaying fragment view for selected nav drawer list item
* */
private void displayView(int position) {
// update the main content by replacing fragments
Fragment fragment = null;
ListFragment listfragment = null;
switch (position) {
case 0:
listfragment = new HomeFragment();
break;
case 1:
listfragment = new FindPeopleFragment();
break;
case 2:
listfragment = new PhotosFragment();
break;
case 3:
listfragment = new CommunityFragment();
break;
case 4:
listfragment = new PagesFragment();
break;
case 5:
listfragment = new WhatsHotFragment();
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 if (listfragment != null) {
// do stuff if its a listfragment
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, listfragment)
.commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
片段代码-无法填充ListView
public class PagesFragment extends ListFragment
{
// Counter for checking if Parsed Values are empty - To tell user event has not started
int counter;
int ButtonCounter = 0;
private String gamename;
private String gamedate;
// Progress Dialog
private ProgressDialog pDialog;
private ProgressDialog pDialog2;
private EditText editText;
private TextView textView;
private ListView list1;
//Main variables
private static String pt;
private static String pd;
// Creating JSON Parser object
JSONParser jsonParser = new JSONParser();
ArrayList<HashMap<String, String>> inboxList;
// products JSONArray
JSONArray inbox = null;
JSONArray tour = null;
// Inbox JSON url
private static final String INBOX_URL = "http://www…";
// ALL JSON node namesapi_key=tD3djFMGmyWmDUdcgmBVFCd3
private static final String TAG_MESSAGES = "p";
private static final String TAG_ID = "p";
private static final String TAG_FROM = "g";
private static final String TAG_EMAIL = "t";
private static final String TAG_SUBJECT = "r";
private static final String TAG_DATE = "s";
private static final String TAG_TOUR = "t";
private static final String TAG_TOURDATE = "d";
public PagesFragment(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.women_list, container, false);
list1 = (ListView) rootView.findViewById(android.R.id.list);
new LoadInbox().execute();
return rootView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
// Hashmap for
inboxList = new ArrayList<HashMap<String, String>>();
/**
* Background Async Task to Load all INBOX messages by making HTTP Request
* */
Log.d("ITS RUNNING!", "Log Message");
new LoadInbox().execute();
}
private void populateList()
{
}
class LoadInbox extends AsyncTask<String, String, String>
{
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute ()
{
}
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
return null;
}
/**
* getting Inbox JSON
* */
}
protected void onPostExecute(String file_url)
{
Log.d("Comments", "DoInBackground");
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jsonParser.makeHttpRequest(INBOX_URL, "GET",
params);
try {
Log.d("Comments", "Try Try Try Try");
inbox = json.getJSONArray(TAG_MESSAGES);
inbox.toString();
// looping through All messages
for (int i = 0; i < inbox.length(); i++)
{
JSONObject c = inbox.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_ID);
//Get TOURNAMENT NAME
pgatour = c.getString(TAG_TOUR);
//Get TOURNAMENT DATE
tourdate = c.getString(TAG_TOURDATE);
//Get GOLFER NAME
String from = c.getString(TAG_FROM);
if(from != null && !from.isEmpty())
{
}
//check if blank
else
{
from = "--";
counter++;
}
//GET THUR
String mailer = c.getString(TAG_EMAIL);
if(mailer != null && !mailer.isEmpty())
{
}
else{ mailer = "--";}
///GET ROUND
String subject = c.getString(TAG_SUBJECT);
if(subject != null && !subject.isEmpty())
{
}
else{ subject = "--";}
///GET SCORE
String date = c.getString(TAG_DATE);
if(date != null && !date.isEmpty())
{
}
else
{ subject = "--";
}
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_ID, id);
map.put(TAG_FROM, from);
map.put(TAG_EMAIL, mailer);
map.put(TAG_DATE, date);
map.put(TAG_SUBJECT, subject);
// adding HashList to ArrayList
inboxList.add(map);
}
}
catch (JSONException e)
{
e.printStackTrace();
}
if( pgatour != null)
{
}
else
{
}
getActivity().runOnUiThread(new Runnable()
{
public void run()
{
//This is for displaying the TOUR NAME & Data above button
textView = (TextView) getView().findViewById(R.id.textView6);
textView.setText(" "+ pt + " - " + pd);
/**
* Updating parsed JSON data into ListView
* */
Log.d("Comments", "pt" +pd );
ListAdapter adapter = new SimpleAdapter(
getActivity(), inboxList,
R.layout.women_list_item, new String[] { TAG_ID, TAG_FROM,TAG_DATE,TAG_EMAIL,TAG_SUBJECT},
new int[] { R.id.from, R.id.subject, R.id.date,R.id.mail,R.id.roundscore });
// updating listview
list1.setAdapter(adapter);
}
});
//class end
}
}
布局CODE XML-Women_list.XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" >
<TextView
android:id="@+id/textView1"
android:text="POS"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1"
android:textSize="11dp"
android:gravity="center"
/>
<TextView
android:id="@+id/textView2"
android:text="G"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1"
android:textSize="11dp"
android:gravity="center"
/>
<TextView
android:id="@+id/textView3"
android:text="S"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1"
android:textSize="11dp"
android:gravity="center"
/>
<TextView
android:id="@+id/textView4"
android:text="T"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1"
android:textSize="11dp"
android:gravity="center"
/>
<TextView
android:id="@+id/textView5"
android:text="R"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1"
android:textSize="11dp"
android:gravity="center"
/>
</LinearLayout>
<ListView
android:id="@id/android:list"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:background="#E5E4E2"
android:divider="#736F6E"
android:dividerHeight="4px"
android:padding="8dp"
android:layout_weight="1.0"/>
<TextView
android:id="@+id/textView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="0"
android:textSize="12dp"
android:textColor="#90d2c6"
android:layout_centerVertical="true"
/>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<Button
android:id="@+id/button1"
android:text="Refresh Scores"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:textSize="11dp"
android:layout_weight="1"
/>
</RelativeLayout>
</LinearLayout>
MainActivity XML布局:
<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" />
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<!-- Listview to display slider menu -->
<ListView
android:id="@+id/list"
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"/>
错误信息: #
09-21 17:18:34.873:E / AndroidRuntime(3814):致命异常:主要
09-21 17:18:34.873:E / AndroidRuntime(3814):进程:info.androidhive.slidingmenu,PID:3814
09-21 17:18:34.873:E / AndroidRuntime(3814):java.lang.RuntimeException:无法启动活动ComponentInfo {info.androidhive.slidingmenu / info.androidhive.slidingmenu.MainActivity}:java.lang.RuntimeException:您内容必须具有ID属性为“ android.R.id.list”的ListView
09-21 17:18:34.873:E / AndroidRuntime(3814):位于android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2314)
09-21 17:18:34.873:E / AndroidRuntime(3814):位于android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2388)
09-21 17:18:34.873:E / AndroidRuntime(3814):at android.app.ActivityThread.access $ 800(ActivityThread.java:148)
09-21 17:18:34.873:E / AndroidRuntime(3814):位于android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1292)
09-21 17:18:34.873:E / AndroidRuntime(3814):at and oid.os.Handler.dispatchMessage(Handler.java:102)
09-21 17:18:34.873:E / AndroidRuntime(3814):位于android.os.Looper.loop(Looper.java:135)
09-21 17:18:34.873:E / AndroidRuntime(3814):位于android.app.ActivityThread.main(ActivityThread.java:5312)
09-21 17:18:34.873:E / AndroidRuntime(3814):at java.lang.reflect.Method.invoke(本机方法)
09-21 17:18:34.873:E / AndroidRuntime(3814):at java.lang.reflect.Method.invoke(Method.java:372)
09-21 17:18:34.873:E / AndroidRuntime(3814):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:901)
09-21 17:18:34.873:E / AndroidRuntime(3814):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
09-21 17:18:34.873:E / AndroidRuntime(3814):由以下原因引起:java.lang.RuntimeException:您的内容必须具有ID属性为'android.R.id.list'的ListView
09-21 17:18:34.873:E / AndroidRuntime(3814):位于android.support.v4.app.ListFragment.ensureList(ListFragment.java:344)
09-21 17:18:34.873:E / AndroidRuntime(3814):位于android.support.v4.app.ListFragment.onViewCreated(ListFragment.java:145)
09-21 17:18:34.873:E / AndroidRuntime(3814):位于android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:941)
09-21 17:18:34.873:E / AndroidRuntime(3814):位于android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
09-21 17:18:34.873:E / AndroidRuntime(3814):位于android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
09-21 17:18:34.873:E / AndroidRuntime(3814):位于android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)
09-21 17:18:34.873:E / AndroidRuntime(3814):位于android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:556)
09-21 17:18:34.873:E / AndroidRuntime(3814):at和roid.app.Instrumentation.callActivityOnStart(Instrumentation.java:1243)
09-21 17:18:34.873:E / AndroidRuntime(3814):位于android.app.Activity.performStart(Activity.java:5969)
09-21 17:18:34.873:E / AndroidRuntime(3814):位于android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2277)
09-21 17:18:34.873:E / AndroidRuntime(3814):...还有10个
最佳答案
根据android:id =“ @ id / android:list”的文档
ListFragment here。小部分。
ListFragment具有由单个列表视图组成的默认布局。
但是,如果需要,可以通过以下方式自定义片段布局
从onCreateView(LayoutInflater,
ViewGroup,捆绑销售)。为此,您的视图层次结构必须包含一个
ID为“ @android:id / list”的ListView对象(如果位于,则为list
码)
解决方案1
因此,如果要将片段更改为ListFragment,请确保布局文件中的listView的ID也必须更改,并且应如下所示
<ListView
android:id="@id/android:list"
>
并应该在onCreate中。
View rootView = inflater.inflate(R.layout.women_list, container, false);
list1 = (ListView) rootView.findViewById(android.R.id.list);
然后设置适配器
要么
解决方案2
在onCreateView内,您无需查找视图并使用onStart或onResume中的以下代码直接设置适配器。
setListAdapter(adapter);
要么
解决方案3
在onViewCreated或更高版本的回调方法中,您可以使用getListView,如下所示
然后设置适配器...如果在onCreateView中使用,请注意此;会抛出异常
ListView list1 = getListView()
但是请确保您不在其他地方使用相同的布局文件
ListFragment和ListActivity,如果这样做,则会出现错误。
基于讨论和试用的更新
感谢您的简单布局R.layout.Women_list。我使用它创建了一个示例项目,其中有一个主Activity(扩展了AppCompatActivity)和一个Fragment(扩展了ListFragment)。并再次成功测试了上述解决方案。
现在来解决您的问题。
您的应用程序中可能有多个布局,其中可能包含许多列表视图...因此,所有列表视图的ID都不必为@ id / android:list,而仅那些列表视图必须具有其ID的ID或在扩展的Fragment中使用的布局扩展ListActivity的ListFragment或Activiy也请参考前面的说明。
我不知道为什么您要在MainActivity布局中将列表视图的ID保留为android:list,是否真的需要它?
请再次检查所有片段和活动以及应用程序中使用的布局。可能是您确实在一个文件夹中更改了listview的ID,然后又更改了另一个,因此您需要更改res / layout /和res /该R.layout.Women_list的layout -... /目录
关于java - 在 fragment 和列表 fragment 之间切换会导致错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32697511/