片段不表明TabHost的第二次内容 [英] Fragment dont show content of TabHost in second time
本文介绍了片段不表明TabHost的第二次内容的处理方法，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
嗯... 我与片段，android.support.v4.widget.DrawerLayout，TabHost和ViewPager工作... 我有以下的code：
Well... I'm working with fragments, android.support.v4.widget.DrawerLayout, TabHost and ViewPager ... I have the following code:
main_base.xml
main_base.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
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<ListView
android:id="@+id/listado_pintado"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="0dp"
android:background="#fff"/>
我的活动：
Main_Activity
Main_Activity
package com.examples.planets;
import android.annotation.SuppressLint;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.Context;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.GravityCompat;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TabHost;
import com.examples.planets.TabsFragmentos;
import com.examples.planets.fragmentos.mercury.TabFragmentDescribeMercury;
import com.examples.planets.fragmentos.mercury.TabFragmentShowMercury;
import com.examples.planets.paginadores.AdaptadorDePaginas;
import com.examples.planets.utilidades.enums.Menu_;
import java.util.HashMap;
import java.util.List;
import java.util.Vector;
public class Main_Activity extends FragmentActivity{
public DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mAccionadorDelDrawer;
private CharSequence mDrawerTitulo;
private CharSequence mTitulo;
private String[] menuPrincipal;
public void cargarMenu(){
//Titulo
mTitulo = mDrawerTitulo = getTitle();
//Main_Activity Principal
menuPrincipal = getResources().getStringArray(R.array.menu_principal_array);
//Diseñador del Layout
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.listado_pintado);
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
mDrawerList.setAdapter(new ArrayAdapter<String>(this,
R.layout.menu_listado, menuPrincipal));
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mAccionadorDelDrawer = new ActionBarDrawerToggle(
this, /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* Imagen del Accionador del menu */
R.string.drawer_open, /* "open drawer" description for accessibility */
R.string.drawer_close /* "close drawer" description for accessibility */
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitulo);
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitulo);
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mAccionadorDelDrawer);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.menu_base);
cargarMenu();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
//inflater.inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// If the nav drawer is open, hide action items related to the content view
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
//menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (mAccionadorDelDrawer.onOptionsItemSelected(item)) {
return true;
}
return super.onOptionsItemSelected(item);
}
private class DrawerItemClickListener implements ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
}
private void selectItem(int position) {
android.support.v4.app.FragmentManager manager = super.getSupportFragmentManager();
TabsFragmentos firstFragment = new TabsFragmentos(position, this, super.getSupportFragmentManager());
manager.beginTransaction()
.replace(R.id.content_frame, firstFragment).commit();
mDrawerList.setItemChecked(position, true);
setTitle(menuPrincipal[position]);
mDrawerLayout.closeDrawer(mDrawerList);
//cargarMenu();
}
@Override
public void setTitle(CharSequence title) {
mTitulo = title;
getActionBar().setTitle(mTitulo);
}
/**
* Cuando usamos el ActionBarDrawerToggle, se debería llamar este durante el
* onPostCreate() y el onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
onRestoreInstanceState.
mAccionadorDelDrawer.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mAccionadorDelDrawer.onConfigurationChanged(newConfig);
}
}
而TabFragments是片段：
And the TabFragments is Fragment:
package com.examples.planets.fragmentos;
import java.util.HashMap;
import java.util.List;
import java.util.Vector;
import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TabHost;
import android.widget.TabHost.TabContentFactory;
....
/**
* @author roldan
*
*/
@SuppressLint("ValidFragment")
public class TabsFragmentos extends Fragment implements TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener {
private TabHost mTabHost;
private HashMap<String, TabInfo> mapTabInfo = new HashMap<String, TabInfo>();
private TabInfo mLastTab = null;
private AdaptadorDePaginas mAdaptadorPaginas;
private ViewPager mViewPager;
private int posicion;
private FragmentManager supportFragmentManager;
private static Menu_Principal menu_principal;
public static TabsFragmentos newInstance() {
return new TabsFragmentos();
}
public TabsFragmentos(){
}
public TabsFragmentos(int position, Menu_Principal menu_principal, FragmentManager supportFragmentManager) {
this.posicion = position;
this.menu_principal = menu_principal;
this.supportFragmentManager = supportFragmentManager;
}
/**
*
* @author mwho
*
*/
private class TabInfo {
private String tag;
private Class<?> clss;
private Bundle args;
private android.support.v4.app.Fragment fragment;
TabInfo(String tag, Class<?> clazz, Bundle args) {
this.tag = tag;
this.clss = clazz;
this.args = args;
}
}
/**
*
* @author mwho
*
*/
class TabFactory implements TabContentFactory {
private final Context mContext;
/**
* @param context
*/
public TabFactory(Context context) {
mContext = context;
}
/** (non-Javadoc)
* @see android.widget.TabHost.TabContentFactory#createTabContent(String)
*/
public View createTabContent(String tag) {
View v = new View(mContext);
v.setMinimumWidth(0);
v.setMinimumHeight(0);
return v;
}
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//int posicion = getArguments().getInt(ARGUMENTO_);
super.onCreate(savedInstanceState);
if (savedInstanceState != null) {
mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab")); //set the tab as per the saved state
}
View rootView = null;
if (Menu_.MERCURY.getPosicion()== posicion){
//rootView = inflater.inflate(R.layout.fragmento_palabra_bk, container, false);
rootView = inflater.inflate(R.layout.fragmentos_base, container, false);
initialiseTabHost(rootView, savedInstanceState);
intialiseViewPager(rootView);
}
return rootView;
}
/** (non-Javadoc)
* @see android.support.v4.app.FragmentActivity#onSaveInstanceState(android.os.Bundle)
*/
public void onSaveInstanceState(Bundle outState) {
outState.putString("tab", mTabHost.getCurrentTabTag()); //save the tab selected
super.onSaveInstanceState(outState);
}
/**
* Initializando el TabHost
*/
private void initialiseTabHost(View rootView, Bundle args) {
mTabHost = (TabHost)rootView.findViewById(android.R.id.tabhost);
//mTabHost = (TabHost)findViewById(android.R.id.tabhost);
mTabHost.setup();
TabInfo tabInfo = null;
TabsFragmentos.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab2").setIndicator("Buscar"), ( tabInfo = new TabInfo("Tab1", TabFragmentOne.class, args)));
this.mapTabInfo.put(tabInfo.tag, tabInfo);
TabsFragmentos.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Tab1").setIndicator("Crear"), ( tabInfo = new TabInfo("Tab2", TabFragmentTwo.class, args)));
this.mapTabInfo.put(tabInfo.tag, tabInfo);
// Default to first tab
this.onTabChanged("Tab1");
mTabHost.setOnTabChangedListener(this);
}
private void intialiseViewPager(View rootView) {
List<android.support.v4.app.Fragment> fragments = new Vector<android.support.v4.app.Fragment>();
fragments.add(android.support.v4.app.Fragment.instantiate(menu_principal, TabFragmentOne.class.getName()));
fragments.add(android.support.v4.app.Fragment.instantiate(menu_principal, TabFragmentTwo.class.getName()));
this.mAdaptadorPaginas = new AdaptadorDePaginas(supportFragmentManager, fragments);
//
this.mViewPager = (ViewPager)rootView.findViewById(R.id.tabviewpager);
this.mViewPager.setAdapter(this.mAdaptadorPaginas);
this.mViewPager.setOnPageChangeListener(this);
}
/**
* @param activity
* @param tabHost
* @param tabSpec
*/
private static void addTab(TabsFragmentos activity, TabHost tabHost, TabHost.TabSpec tabSpec, TabInfo tabInfo) {
// Attach a Tab view factory to the spec
tabSpec.setContent(activity.new TabFactory(menu_principal));
String tag = tabSpec.getTag();
// Check to see if we already have a fragment for this tab, probably
// from a previously saved state. If so, deactivate it, because our
// initial state is that a tab isn't shown.
if (tabInfo.fragment != null && !tabInfo.fragment.isDetached()) {
FragmentTransaction ft = menu_principal.getSupportFragmentManager().beginTransaction();
ft.detach(tabInfo.fragment);
ft.commit();
menu_principal.getSupportFragmentManager().executePendingTransactions();
}
tabHost.addTab(tabSpec);
}
public void onTabChanged(String tag) {
try{
//TabInfo newTab = this.mapTabInfo.get(tag);
int pos = this.mTabHost.getCurrentTab();
this.mViewPager.setCurrentItem(pos);
}catch(Exception e){}
}
@Override
public void onPageScrolled(int i, float v, int i2) {
}
@Override
public void onPageSelected(int position) {
// TODO Auto-generated method stub
this.mTabHost.setCurrentTab(position);
}
@Override
public void onPageScrollStateChanged(int i) {
}
}
什么问题？
在code工作正常第一次...只有pressed任何选项，并显示出与你的布局联营卡到TabFragmentOne或TabFragmentTwo片段！ 第二次，这code仅显示标签，但不显示布局关联到TabFragmentOne或TabFragmentTwo片段！
the code is working fine the first time... only pressed any option and show the tabs with yours layout associate to the TabFragmentOne or TabFragmentTwo fragments! the second time, this code only show the tabs but dont show the layout associate to the TabFragmentOne or TabFragmentTwo fragments!
我该怎么办？
THX 4前进。
推荐答案
对于我来说，这个问题是在我的 TabsAdapter <$ C C $>。单个构造是这样的：
For me, the problem was in my TabsAdapter. The single constructor looked like this:
public TabsAdapter(FragmentActivity activity, TabHost tabHost, ViewPager pager) {
super(activity.getSupportFragmentManager());
mContext = activity;
mTabHost = tabHost;
mViewPager = pager;
mTabHost.setOnTabChangedListener(this);
mViewPager.setAdapter(this);
mViewPager.setOnPageChangeListener(this);
}
它调用的 getSupportFragmentManager 返回的 FragmentManager 我们 FragmentActivity 。坏。我们需要的，我们目前的片段管理FM。创建使用 getChildFragmentManager 的伎俩替代（重载）构造函数。
It's calling getSupportFragmentManager which returns the FragmentManager associated with our FragmentActivity. Bad. We need the FM that our current Fragment manages. Creating an alternate (overloaded) constructor that used getChildFragmentManager did the trick.
public TabsAdapter(Fragment fragment, TabHost tabHost, ViewPager pager) {
super(fragment.getChildFragmentManager());
mContext = fragment.getActivity();
mTabHost = tabHost;
mViewPager = pager;
mTabHost.setOnTabChangedListener(this);
mViewPager.setAdapter(this);
mViewPager.setOnPageChangeListener(this);
}
您的问题从相同的问题茎，只是以不同的格式。在片段替换您的来电 getSupportFragmentManager 与 getChildFragmentManager 。
Your problem stems from the same exact issue, just in a different format. Replace your calls to getSupportFragmentManager with getChildFragmentManager in your Fragment.
这篇关于片段不表明TabHost的第二次内容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！
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