如果您需要更改適配器數據刪除並重新創建我已經在Android的Support4Demos做簡單的修改來證明我是如何更新我的適配器的片段頁面將提供更多的信息。
/**
* Demonstrates combining a TabHost with a ViewPager to implement a tab UI
* that switches between tabs and also allows the user to perform horizontal
* flicks to move between the tabs.
*/
public class FragmentTabsPager extends FragmentActivity implements View.OnClickListener,FragmentCallBack{
TabHost mTabHost;
ViewPager mViewPager;
TabsAdapter mTabsAdapter;
private Button mBtn_nextFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_tabs_pager);
mTabHost = (TabHost)findViewById(android.R.id.tabhost);
mBtn_nextFragment=(Button)findViewById(R.id.btn_next_fragment);
mBtn_nextFragment.setOnClickListener(this);
mTabHost.setup();
mViewPager = (ViewPager)findViewById(R.id.pager);
mTabsAdapter = new TabsAdapter(this, mTabHost, mViewPager);
mTabsAdapter.addTab(mTabHost.newTabSpec("simple").setIndicator("Simple"),
FragmentStackSupport.CountingFragment.class, null);
mTabsAdapter.addTab(mTabHost.newTabSpec("contacts").setIndicator("Contacts"),
LoaderCursorSupport.CursorLoaderListFragment.class, null);
mTabsAdapter.addTab(mTabHost.newTabSpec("custom").setIndicator("Custom"),
LoaderCustomSupport.AppListFragment.class, null);
mTabsAdapter.addTab(mTabHost.newTabSpec("throttle").setIndicator("Throttle"),
LoaderThrottleSupport.ThrottledLoaderListFragment.class, null);
if (savedInstanceState != null) {
mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab"));
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putString("tab", mTabHost.getCurrentTabTag());
}
/**
* This is a helper class that implements the management of tabs and all
* details of connecting a ViewPager with associated TabHost. It relies on a
* trick. Normally a tab host has a simple API for supplying a View or
* Intent that each tab will show. This is not sufficient for switching
* between pages. So instead we make the content part of the tab host
* 0dp high (it is not shown) and the TabsAdapter supplies its own dummy
* view to show as the tab content. It listens to changes in tabs, and takes
* care of switch to the correct paged in the ViewPager whenever the selected
* tab changes.
*/
public static class TabsAdapter extends FragmentStatePagerAdapter
implements TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener {
private final Context mContext;
private final TabHost mTabHost;
private final ViewPager mViewPager;
private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
static final class TabInfo {
private final String tag;
private final Class<?> clss;
private final Bundle args;
TabInfo(String _tag, Class<?> _class, Bundle _args) {
tag = _tag;
clss = _class;
args = _args;
}
}
static class DummyTabFactory implements TabHost.TabContentFactory {
private final Context mContext;
public DummyTabFactory(Context context) {
mContext = context;
}
@Override
public View createTabContent(String tag) {
View v = new View(mContext);
v.setMinimumWidth(0);
v.setMinimumHeight(0);
return v;
}
}
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);
}
public void clearData(){
mTabs.clear();
notifyDataSetChanged();
}
public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
tabSpec.setContent(new DummyTabFactory(mContext));
String tag = tabSpec.getTag();
TabInfo info = new TabInfo(tag, clss, args);
mTabs.add(info);
mTabHost.addTab(tabSpec);
notifyDataSetChanged();
}
@Override
public int getCount() {
return mTabs.size();
}
@Override
public Fragment getItem(int position) {
TabInfo info = mTabs.get(position);
return Fragment.instantiate(mContext, info.clss.getName(), info.args);
}
@Override
public void onTabChanged(String tabId) {
int position = mTabHost.getCurrentTab();
mViewPager.setCurrentItem(position);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
// Unfortunately when TabHost changes the current tab, it kindly
// also takes care of putting focus on it when not in touch mode.
// The jerk.
// This hack tries to prevent this from pulling focus out of our
// ViewPager.
TabWidget widget = mTabHost.getTabWidget();
int oldFocusability = widget.getDescendantFocusability();
widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
mTabHost.setCurrentTab(position);
widget.setDescendantFocusability(oldFocusability);
}
@Override
public void onPageScrollStateChanged(int state) {
}
}
@Override
public void onClick(View v) {
mTabsAdapter.clearData();
mTabHost.clearAllTabs();
//mTabsAdapter.notifyDataSetChanged();
Bundle mBundleSimple=new Bundle();
mBundleSimple.putString("data", "SimpleData");
mTabsAdapter.addTab(mTabHost.newTabSpec("simple").setIndicator("Simple"),
FragmentStackSupport.CountingFragment.class, mBundleSimple);
Bundle mBundleContacts=new Bundle();
mBundleContacts.putString("data", "Contacts");
mTabsAdapter.addTab(mTabHost.newTabSpec("contacts").setIndicator("Contacts"),
LoaderCursorSupport.CursorLoaderListFragment.class, mBundleContacts);
Bundle mBundleCustom=new Bundle();
mBundleCustom.putString("data", "Custom");
mTabsAdapter.addTab(mTabHost.newTabSpec("custom").setIndicator("Custom"),
LoaderCustomSupport.AppListFragment.class, mBundleCustom);
Bundle mBundleThrottle=new Bundle();
mBundleThrottle.putString("data", "Throttle");
mTabsAdapter.addTab(mTabHost.newTabSpec("throttle").setIndicator("Throttle"),
LoaderThrottleSupport.ThrottledLoaderListFragment.class, mBundleThrottle);
mViewPager.setAdapter(mTabsAdapter);
}
@Override
public void ClickButton(String strToken) {
if(strToken.equalsIgnoreCase("OneBtn")){
mTabsAdapter.clearData();
mTabHost.clearAllTabs();
//mTabsAdapter.notifyDataSetChanged();
Bundle mBundleSimple=new Bundle();
mBundleSimple.putString("data", "SimpleData");
mTabsAdapter.addTab(mTabHost.newTabSpec("simple").setIndicator("Simple"),
FragmentStackSupport.CountingFragment.class, mBundleSimple);
Bundle mBundleContacts=new Bundle();
mBundleContacts.putString("data", "SimpleData");
mTabsAdapter.addTab(mTabHost.newTabSpec("contacts").setIndicator("Contacts"),
LoaderCursorSupport.CursorLoaderListFragment.class, mBundleContacts);
Bundle mBundleCustom=new Bundle();
mBundleCustom.putString("data", "Custom");
mTabsAdapter.addTab(mTabHost.newTabSpec("custom").setIndicator("Custom"),
LoaderCustomSupport.AppListFragment.class, mBundleCustom);
Bundle mBundleThrottle=new Bundle();
mBundleThrottle.putString("data", "Throttle");
mTabsAdapter.addTab(mTabHost.newTabSpec("throttle").setIndicator("Throttle"),
LoaderThrottleSupport.ThrottledLoaderListFragment.class, mBundleThrottle);
mViewPager.setAdapter(mTabsAdapter);
}
}
}
在上面的片段活動中，我已經做出以下更改以重新創建適配器數據。
1.製作清除碎片列表的公共函數，在本例中爲mTabs。 2.清除碎片數組後添加您的新片段與您所需的更改，在上面的類，你可以看到，我已經添加片段與它的捆綁，並且我可以在所有片段類。 3.在ViewPager中設置Adaper。
下面是保存片段代碼的類。
public class FragmentStackSupport extends FragmentActivity {
int mStackLevel = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_stack);
// Watch for button clicks.
Button button = (Button)findViewById(R.id.new_fragment);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
addFragmentToStack();
}
});
button = (Button)findViewById(R.id.home);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// If there is a back stack, pop it all.
FragmentManager fm = getSupportFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
fm.popBackStack(fm.getBackStackEntryAt(0).getId(),
FragmentManager.POP_BACK_STACK_INCLUSIVE);
}
}
});
if (savedInstanceState == null) {
// Do first time initialization -- add initial fragment.
Fragment newFragment = CountingFragment.newInstance(mStackLevel);
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.add(R.id.simple_fragment, newFragment).commit();
} else {
mStackLevel = savedInstanceState.getInt("level");
}
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("level", mStackLevel);
}
void addFragmentToStack() {
mStackLevel++;
// Instantiate a new fragment.
Fragment newFragment = CountingFragment.newInstance(mStackLevel);
// Add the fragment to the activity, pushing this transaction
// on to the back stack.
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.simple_fragment, newFragment);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
ft.addToBackStack(null);
ft.commit();
}
public static class CountingFragment extends Fragment implements OnClickListener {
int mNum;
Button mBtnOne;
FragmentCallBack mFragmentCallBack;
/**
* Create a new instance of CountingFragment, providing "num"
* as an argument.
*/
static CountingFragment newInstance(int num) {
CountingFragment f = new CountingFragment();
// Supply num input as an argument.
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
/**
* When creating, retrieve this instance's number from its arguments.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mNum = getArguments() != null ? getArguments().getInt("num") : 1;
if(getArguments()!=null){
if(getArguments().containsKey("data")){
String dataIs=getArguments().getString("data");
Log.v("LOG_TAG", "THis Tab data is "+ dataIs);
}
}
}
/**
* The Fragment's UI is just a simple text view showing its
* instance number.
*/
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if(getArguments()!=null){
if(getArguments().containsKey("data")){
String dataIs=getArguments().getString("data");
Log.v("LOG_TAG", "THis Tab data is onCreateView "+ dataIs);
}
}
View v = inflater.inflate(R.layout.hello_world, container, false);
TextView tv = (TextView) v.findViewById(R.id.text);
mBtnOne=(Button)v.findViewById(R.id.btn_one);
mBtnOne.setOnClickListener(this);
tv.setText("Fragment #" + mNum);
tv.setBackgroundDrawable(getResources().getDrawable(android.R.drawable.gallery_thumb));
return v;
}
@Override
public void onClick(View v) {
try{
mFragmentCallBack=(FragmentCallBack) this.getActivity();
mFragmentCallBack.ClickButton("OneBtn");
}catch(ClassCastException classExc){
classExc.printStackTrace();
}
}
}
}
現在，當一些事情是在你的任何片段的變化，你需要創建一個界面，發送回叫FragmentActivity持有你ViewPager這樣你就可以刪除現有的片段，再重新創建它。
這是我的接口類。
public interface FragmentCallBack {
public void ClickButton(String strToken);
}
希望你會得到你如何在你的代碼中做同樣的事情。