如何将列表视图放在片段中 [英] How to put listview inside a fragment
本文介绍了如何将列表视图放在片段中的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
如何将列表视图放入片段中?我使用带有固定选项卡的默认项目设置.
How can I put a list view into a fragment? I use the default project setup with fixed tab.
它似乎不起作用，我的应用程序崩溃了.
It doesn't seem to work, and my app crashes.
主要活动
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import android.app.ActionBar;
import android.app.FragmentTransaction;
import android.app.ListActivity;
import android.app.ListFragment;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
public class MainActivity extends FragmentActivity implements
ActionBar.TabListener {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
* will keep every loaded fragment in memory. If this becomes too memory
* intensive, it may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
public final static String PREFS_NAME = "UserData";
@Override
protected void onCreate(Bundle savedInstanceState) {
//Only for safe mode
StrictMode.ThreadPolicy policy = new StrictMode.
ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
/***********************************USER***************************/
//Get User info (if exist)
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
String id = settings.getString("id", "");
String pass = settings.getString("pass", "");
SectionsPagerAdapter mSectionsPagerAdapter;
//Else create New User
if (id == "")
{
System.out.println("Create New User...");
UserRegistration.CreateUser(getApplicationContext());
}
/**** OTHER*****/
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set up the action bar.
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
// When swiping between different sections, select the corresponding
// tab. We can also use ActionBar.Tab#select() to do this if we have
// a reference to the Tab.
mViewPager
.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
// For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
// Create a tab with text corresponding to the page title defined by
// the adapter. Also specify this Activity object, which implements
// the TabListener interface, as the callback (listener) for when
// this tab is selected.
actionBar.addTab(actionBar.newTab()
.setText(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onTabSelected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in
// the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
@Override
public void onTabReselected(ActionBar.Tab tab,
FragmentTransaction fragmentTransaction) {
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a DummySectionFragment (defined as a static inner class
// below) with the page number as its lone argument.
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
// Show 5 total pages.
return 5;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
case 3:
return getString(R.string.title_section4).toUpperCase(l);
case 4:
return getString(R.string.title_section5).toUpperCase(l);
}
return null;
}
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class DummySectionFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment() {
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main_dummy, container, false);
/***********************************CONTEST INC**********************
String xmlURL;
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
xmlURL = URL;
System.out.println("Case 1");
Document doc = XMLfunctions.XMLfromString(XMLfunctions.getXML(xmlURL));
NodeList nodes = doc.getElementsByTagName("contest");
for (int i = 0; i < nodes.getLength(); i++)
{
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element)nodes.item(i);
map.put("id", XMLfunctions.getValue(e, "id"));
map.put("name", XMLfunctions.getValue(e, "name"));
map.put("subtitle",XMLfunctions.getValue(e, "subtitle"));
mylist.add(map);
System.out.println(mylist);
}
//new ArrayAdapter<String>(context, android.R.layout.simple_list_item_1, android.R.id.text1, actions);
ListAdapter adapter = new SimpleAdapter(this.getActivity(), mylist , R.layout.contest_list,
new String[] { "name", "subtitle" },
new int[] { R.id.item_title, R.id.item_subtitle });
ListFragment.setListAdapter(adapter);
final ListView lv = getApplication().getActivity().getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
@SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) lv.getItemAtPosition(position);
Toast.makeText(this, "ID '" + o.get("id") + "' was clicked.", Toast.LENGTH_LONG).show();
}
});
/*************************************END CONTEST*********************/
ContestList.GetList(getActivity(), 1, "mm", "njk");
//TextView dummyTextView = (TextView) rootView
// .findViewById(R.id.section_label);
String sectionNumb = Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER));
int cat1;
cat1 = Integer.parseInt(sectionNumb);
switch (cat1)
{
case 1:
break;
case 2:
break;
case 3:
break;
case 4:
break;
case 5:
break;
}
return rootView;
}
}
}
竞赛列表类
import java.util.ArrayList;
import java.util.HashMap;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import android.app.ListActivity;
import android.app.ListFragment;
import android.content.Context;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
public class ContestList {
public final static String PREFS_NAME = "UserData";
public static String GetList(Context context, int type, String id, String pass)
{
String xmlURL;
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
xmlURL = URL;
System.out.println("Case 1");
Document doc = XMLfunctions.XMLfromString(XMLfunctions.getXML(xmlURL));
NodeList nodes = doc.getElementsByTagName("contest");
for (int i = 0; i < nodes.getLength(); i++)
{
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element)nodes.item(i);
map.put("id", XMLfunctions.getValue(e, "id"));
map.put("name", XMLfunctions.getValue(e, "name"));
map.put("subtitle",XMLfunctions.getValue(e, "subtitle"));
mylist.add(map);
System.out.println(mylist);
}
//new ArrayAdapter<String>(context, android.R.layout.simple_list_item_1, android.R.id.text1, actions);
ListAdapter adapter = new SimpleAdapter(context, mylist , R.layout.contest_list,
new String[] { "name", "subtitle" },
new int[] { R.id.item_title, R.id.item_subtitle });
((ListActivity) context).setListAdapter(adapter);
final ListView lv = ((ListActivity) context).getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
@SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) lv.getItemAtPosition(position);
//Toast.makeText(Main.this, "ID '" + o.get("id") + "' was clicked.", Toast.LENGTH_LONG).show();
}
});
return "OK";
}
public String adapter(ListAdapter adapter)
{/*
setListAdapter(adapter);
final ListView lv = getApplication().getActivity().getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
@SuppressWarnings("unchecked")
HashMap<String, String> o = (HashMap<String, String>) lv.getItemAtPosition(position);
Toast.makeText(MainActivity.this, "ID '" + o.get("id") + "' was clicked.", Toast.LENGTH_LONG).show();
}
});*/
return "OK";
}
}
activity_main 布局:
activity_main layout:
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" />
Fragment_main_dummy 布局:
Fragment_main_dummy layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ListView
android:id="@id/android:list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:drawSelectorOnTop="false" />
<TextView
android:id="@id/android:empty"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="No data"/>
<TextView
android:id="@+id/item_title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:padding="2dp"
android:textSize="20dp" />
<TextView
android:id="@+id/item_subtitle"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="2dp"
android:textSize="13dp" />
有人知道我的应用为什么会崩溃吗?或者有其他方法可以将列表视图放在片段中?
Someone know why my app crash? or have an alternative for put a listview inside a fragment?
谢谢
错误日志
03-20 12:53:31.219: E/AndroidRuntime(3104): FATAL EXCEPTION: main
03-20 12:53:31.219: E/AndroidRuntime(3104): java.lang.ClassCastException: com.time2win.MainActivity cannot be cast to android.app.ListActivity
03-20 12:53:31.219: E/AndroidRuntime(3104): at com.time2win.ContestList.GetList(ContestList.java:50)
03-20 12:53:31.219: E/AndroidRuntime(3104): at com.time2win.MainActivity$DummySectionFragment.onCreateView(MainActivity.java:241)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:461)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.support.v4.view.ViewPager.populate(ViewPager.java:1012)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.support.v4.view.ViewPager.populate(ViewPager.java:881)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1366)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.View.measure(View.java:15513)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4827)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.View.measure(View.java:15513)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.View.measure(View.java:15513)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4827)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
03-20 12:53:31.219: E/AndroidRuntime(3104): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.View.measure(View.java:15513)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.Choreographer.doFrame(Choreographer.java:532)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.os.Handler.handleCallback(Handler.java:725)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.os.Handler.dispatchMessage(Handler.java:92)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.os.Looper.loop(Looper.java:137)
03-20 12:53:31.219: E/AndroidRuntime(3104): at android.app.ActivityThread.main(ActivityThread.java:5039)
03-20 12:53:31.219: E/AndroidRuntime(3104): at java.lang.reflect.Method.invokeNative(Native Method)
03-20 12:53:31.219: E/AndroidRuntime(3104): at java.lang.reflect.Method.invoke(Method.java:511)
03-20 12:53:31.219: E/AndroidRuntime(3104): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-20 12:53:31.219: E/AndroidRuntime(3104): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-20 12:53:31.219: E/AndroidRuntime(3104): at dalvik.system.NativeStart.main(Native Method)
推荐答案
你可以使用 ListFragment.文档中对此进行了很好的解释:
you could use ListFragment for that. it's nicely explained in the docs:
http://developer.android.com/reference/android/app/ListFragment.html
Vogela 也有这方面的教程:
also Vogela has tutorial on this:
http://www.vogella.com/articles/AndroidListView/article.html#listfragments
这篇关于如何将列表视图放在片段中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
