我在包含ViewPager的Fragment中使用Tab(TabHost或TabContent)时遇到了奇怪的问题。
问题是,当我改变页面后,再回到带有tab和viewPager的Fragment时,我的内容或视图会消失。
->
这是我TabFragment的代码:
package com.halo.mobi.fragment;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
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.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.TabHost.TabContentFactory;
import android.widget.TabWidget;
import android.widget.TextView;
import com.halo.mobi.R;
public class GameTabFragment extends Fragment {
Activity myActivity;
TabWidget tab;
TabHost tabHost;
ViewPager pager;
HorizontalScrollView hsvTab;
List<String> headers;
TabPagerAdapter adapter;
TabContentFactory fac;
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
myActivity = this.getActivity();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View rootView = inflater.inflate(R.layout.game_list_tab_fragment,
container, false);
headers = new ArrayList<String>();
tabHost = (TabHost) rootView.findViewById(R.id.tabHost);
pager = (ViewPager) rootView.findViewById(R.id.pager);
hsvTab = (HorizontalScrollView) rootView.findViewById(R.id.hsvTab);
hsvTab.setHorizontalScrollBarEnabled(false);
tabHost.setup();
fac = new TabContentFactory() {
@Override
public View createTabContent(String tag) {
// TODO Auto-generated method stub
return new View(myActivity);
}
};
tabHost.addTab(tabHost.newTabSpec("cat")
.setIndicator(getTabIndicator(myActivity, "CATEGORIES"))
.setContent(fac));
tabHost.addTab(tabHost.newTabSpec("new")
.setIndicator(getTabIndicator(myActivity, "NEW RELEASE"))
.setContent(fac));
tabHost.addTab(tabHost.newTabSpec("free")
.setIndicator(getTabIndicator(myActivity, "TOP FREE"))
.setContent(fac));
tabHost.addTab(tabHost.newTabSpec("paid")
.setIndicator(getTabIndicator(myActivity, "TOP PAID"))
.setContent(fac));
tabHost.getTabWidget().setBackgroundColor(
getResources().getColor(R.color.merah));
tabHost.setOnTabChangedListener(new OnTabChangeListener() {
@Override
public void onTabChanged(String tabId) {
// TODO Auto-generated method stub
pager.setCurrentItem(tabHost.getCurrentTab());
hsvTab.smoothScrollTo(
tabHost.getTabWidget()
.getChildTabViewAt(tabHost.getCurrentTab())
.getLeft(), 0);
}
});
adapter = new TabPagerAdapter(this.getFragmentManager());
pager.setAdapter(adapter);
pager.setOffscreenPageLimit(5);
pager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
tabHost.setCurrentTab(arg0);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
return rootView;
}
private View getTabIndicator(Context context, String title) {
View view = LayoutInflater.from(context).inflate(
R.layout.gametablayout, null);
TextView tv = (TextView) view.findViewById(R.id.txtTitle);
tv.setText(title);
tv.setSingleLine();
view.setPadding(2, 0, 2, 0);
return view;
}
private class TabPagerAdapter extends FragmentPagerAdapter {
GameCategoryFragment cat;
GameNewReleaseFragment newrelease;
GameTopFreeFragment topfree;
GameTopPaidFragment toppaid;
public TabPagerAdapter(FragmentManager fm) {
super(fm);
cat = new GameCategoryFragment();
newrelease = new GameNewReleaseFragment();
topfree = new GameTopFreeFragment();
toppaid = new GameTopPaidFragment();
// TODO Auto-generated constructor stub
}
@Override
public Fragment getItem(int pos) {
// TODO Auto-generated method stub
if (pos == 0)
return cat;
if (pos == 1)
return newrelease;
if (pos == 2)
return topfree;
if (pos == 3)
return toppaid;
return cat;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 4;
}
}
}
游戏列表选项卡片段.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="top|left"
android:orientation="vertical" >
<TabHost
android:id="@+id/tabHost"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<HorizontalScrollView
android:id="@+id/hsvTab"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/merah" >
<TabWidget
android:id="@android:id/tabs"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</TabWidget>
</HorizontalScrollView>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="match_parent"
android:layout_height="0px"
android:orientation="vertical" >
</FrameLayout>
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</TabHost>
</LinearLayout>
</FrameLayout>
这是MainActivity.java文件的代码:
package com.halo.mobi.activity;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBar.LayoutParams;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import com.halo.mobi.R;
import com.halo.mobi.fragment.GameDetailFragment;
import com.halo.mobi.fragment.GameTabFragment;
import com.halo.mobi.fragment.HomeFragment;
import com.halo.mobi.fragment.NavigationDrawerFragment;
public class MainActivity extends ActionBarActivity implements
NavigationDrawerFragment.NavigationDrawerCallbacks {
/**
* Fragment managing the behaviors, interactions and presentation of the
* navigation drawer.
*/
private NavigationDrawerFragment mNavigationDrawerFragment;
private DrawerLayout drawerLayout;
/**
* Used to store the last screen title. For use in
* {@link #restoreActionBar()}.
*/
private int pos;
FragmentManager fragmentManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
restoreActionBar();
mNavigationDrawerFragment = (NavigationDrawerFragment) getSupportFragmentManager()
.findFragmentById(R.id.navigation_drawer);
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
// Set up the drawer.
mNavigationDrawerFragment.setUp(R.id.navigation_drawer, drawerLayout);
}
@Override
public void onNavigationDrawerItemSelected(int position) {
// update the main content by replacing fragments
fragmentManager = getSupportFragmentManager();
switch (position) {
case 0:
fragmentManager.beginTransaction()
.replace(R.id.container, new HomeFragment())
.addToBackStack("TAG_FRAGMENT").commit();
break;
case 1:
fragmentManager.beginTransaction()
.replace(R.id.container, new GameTabFragment())
.addToBackStack("TAG_FRAGMENT").commit();
break;
default:
fragmentManager.beginTransaction()
.replace(R.id.container, new HomeFragment())
.addToBackStack("TAG_FRAGMENT").commit();
break;
}
}
public void onSectionAttached(int number, int gameId) {
pos = number;
if (gameId != 0) {
fragmentManager = getSupportFragmentManager();
fragmentManager
.beginTransaction()
.replace(R.id.container,
GameDetailFragment.newInstance(number, gameId))
// .addToBackStack("TAG_FRAGMENT")
.commit();
}
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
if (pos == 0) {
finish();
} else {
onNavigationDrawerItemSelected(pos);
}
}
public void restoreActionBar() {
ActionBar mActionBar = getSupportActionBar();
mActionBar.setDisplayShowHomeEnabled(false);
mActionBar.setDisplayShowTitleEnabled(false);
LayoutInflater mInflater = LayoutInflater.from(this);
View mCustomView = mInflater.inflate(R.layout.custom_actionbar, null);
ImageView imageButton = (ImageView) mCustomView
.findViewById(R.id.btnMenu);
imageButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
mNavigationDrawerFragment.openDrawer();
}
});
mActionBar.setCustomView(mCustomView, new LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
mActionBar.setDisplayShowCustomEnabled(true);
}
}
非常感谢您的帮助。
getChildFragmentManager()
代替getSupportFragmentManager()
。 - YugeshMainActivity
的代码吗? - Yugesh