我有一个带有 ABS 的操作栏选项卡系统。第一个选项卡是登录选项卡。我将登录用户存储在本地 SQLite 数据库和 Web SQL 数据库中。当用户点击 loginButton 并且 Async loginTask 完成时，我想更改登录选项卡的 xml 布局。
所以基本上我可以运行测试来查看用户是否登录，如果是，则使用新布局。是否有任何合理的方法可以在位于 actionBar 选项卡系统中的 SherlockFragment 中完成布局切换？
显然，我还需要在 onResume 内部运行相同的检查，以确保用户是否登录，正确的 UI 会显示出来。我的问题是 onCreateView 中的布局当前膨胀，不会重新运行。
这是一些代码：
public class LoginFragment extends SherlockFragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
userFunctions = new UserFunctions();
//test ive made that has no effect since onCreateView only runs once.
if(userFunctions.isUserLoggedIn(activity.getApplicationContext())) {
View v = inflater.inflate(R.layout.loggedin, container, false);
return v;
} else {//standard method when I didnt use the above test
View v = inflater.inflate(R.layout.loginfragment, container, false);
return v;
}
}
我有一个托管选项卡等的活动，这是它的相关代码：
public static class TabsAdapter extends FragmentPagerAdapter
implements ActionBar.TabListener, ViewPager.OnPageChangeListener {
private final Context mContext;
private final ActionBar mActionBar;
private final ViewPager mViewPager;
private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
static final class TabInfo {
private final Class<?> clss;
private final Bundle args;
TabInfo(Class<?> _class, Bundle _args) {
clss = _class;
args = _args;
}
}
/*Constructor method that adds a TabsAdapter to each tab that is created.
* It also adds the ViewPager to each tab so that the user can swipe to change tabs.
*/
public TabsAdapter(SherlockFragmentActivity activity, ViewPager pager) {
super(activity.getSupportFragmentManager());
mContext = activity;
mActionBar = activity.getSupportActionBar();
mViewPager = pager;
mViewPager.setAdapter(this);
mViewPager.setOnPageChangeListener(this);
}
/*A fairly simple method that sets the TabInfo for each tab so that the TabsAdapter
* knows which class the tab that is being added actually belonds to. It also updates
* the UI interface when each tab is added.
*/
public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
TabInfo info = new TabInfo(clss, args);
tab.setTag(info);
tab.setTabListener(this);
mTabs.add(info);
mActionBar.addTab(tab);
notifyDataSetChanged();
}
public int getCount() {
return mTabs.size();
}
/*A method that is used in other classes to allow each tab Fragment to
* access its inherited methods from a mother-class, in this case, SherlockFragment
*/
public SherlockFragment getItem(int position) {
TabInfo info = mTabs.get(position);
return (SherlockFragment)Fragment.instantiate(mContext, info.clss.getName(), info.args);
}
/*This method reads the user's selection for a new tab and sets that tab as
* the new current focus.*/
public void onPageSelected(int position) {
mActionBar.setSelectedNavigationItem(position);
}
public void onPageScrollStateChanged(int state) {}
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}
/* This is the method that actually draws the newest tab onto the screen when
* it is selected.*/
public void onTabSelected(Tab tab, FragmentTransaction ft) {
mViewPager.setCurrentItem(tab.getPosition());
Object tag = tab.getTag();
for (int i=0; i<mTabs.size(); i++) {
if (mTabs.get(i) == tag) {
mViewPager.setCurrentItem(i);
}
}
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {}
public void onTabReselected(Tab tab, FragmentTransaction ft) {}
public void onTabReselected(Tab tab, android.app.FragmentTransaction ft) {}
public void onTabUnselected(Tab tab, android.app.FragmentTransaction ft) {}
}