我有一个带有两个选项卡的操作栏和一个处理片段的 tablistener。现在我希望使用 ViewPager 可以通过滑动来切换选项卡。我尝试了此处所述的解决方案： Android，如何混合 ActionBar.Tab + View Pager + ListFragment
但它与 Android.app.Fragments 和 Support Package Fragments 存在冲突。该应用程序适用于 >4.0，因此我不需要支持片段。
public class MainActivity extends Activity{
....
actionBar = getActionBar();
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setDisplayShowHomeEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
//viewpager
mViewPager = new ViewPager(this);
setContentView(mViewPager);
不起作用：
//TabsAdapter tabsAdapter = new TabsAdapter(this,mViewPager);
// Tab tab1 = actionBar.newTab().setText("Tab1");
// Tab tab2 = actionBar.newTab().setText("Tab2");
// tabsAdapter.addTab(tab1, Tab1Fragment.class, null);
// tabsAdapter.addTab(tab2, Tab2Fragment.class, null);
选择：
//viewpager
mViewPager = new ViewPager(this);
setContentView(mViewPager);
mViewPager.setOnPageChangeListener(
new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// When swiping between pages, select the
// corresponding tab.
super.onPageSelected(position);
getActionBar().setSelectedNavigationItem(position);
}
});
tab_1 = actionBar.newTab().setText("Tab1");
tab_1
.setTabListener(new TabListener<Tab1Fragment>(
this, "Tab1", Tab1Fragment.class,mViewPager));
actionBar.addTab(tab_1);
tab_2 = actionBar.newTab().setText("Tab2");
tab_2
.setTabListener(new TabListener<Tab2Fragment>(
this, "Tab2", Tab2Fragment.class,mViewPager));
actionBar.addTab(tab_2);
/**
* TabListener
* @param <T>
*/
private static class TabListener<T extends Fragment> implements ActionBar.TabListener
{
private Fragment mFragment;
private Activity mActivity;
private final String mTag;
private final Class<T> mClass;
private ViewPager vp;
public TabListener(Activity activity, String tag, Class<T> clz, ViewPager vp) {
mActivity = activity;
mTag = tag;
mClass = clz;
mFragment = mActivity.getFragmentManager().findFragmentByTag(mTag);
this.vp = vp;
}
public void onTabSelected(Tab tab, FragmentTransaction ft) {
if (mFragment == null) {
mFragment = Fragment.instantiate(mActivity, mClass.getName());
ft.replace(android.R.id.content, mFragment, mTag);
} else {
if (mFragment.isDetached()) {
ft.attach(mFragment);
}
}
vp.setCurrentItem(tab.getPosition());
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
if (mFragment != null) {
ft.detach(mFragment);
}
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
}
在 Fragments 类中，我有如下语句：
Bundle args = new Bundle();
args.putString("name", atn.getName());
args.putLong("aid", atn.getId());
AFragment f = new AFragment();
f.setArguments(args);
f.show(getFragmentManager(), "tag");
FragmentManager fragmentManager =mActivity.getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
Fragment f = fragmentManager.findFragmentByTag("Tab1");
if (f != null) {
fragmentTransaction.detach(f);
fragmentTransaction.attach(f);
}
fragmentTransaction.replace(android.R.id.content, f);
fragmentTransaction. commitAllowingStateLoss();
与其他 Fragment 类型不兼容（import android.support.v4.app.Fragment;）。如何轻松添加滑动手势？选项卡上的选择完美无缺。
编辑：使用支持包 13，视图寻呼机工作但内容未刷新。我使用 FragmentStatePagerAdapter，因此应该删除并再次添加 Fragment，但它需要相同的 Fragment 而无需创建新的 Fragment。Viewpage 也命名为 android:switcher 之类的片段...我可以自己命名它们吗？
import android.support.v13.app.FragmentStatePagerAdapter;
public class TabsAdapter extends FragmentStatePagerAdapter
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>();
private Fragment mFragment;
private Activity mActivity;
private String mTag;
private final List<Fragment> fragments = new ArrayList<Fragment>();
static final class TabInfo {
private final Class<?> clss;
private final Bundle args;
private final String name;
TabInfo(Class<?> _class, Bundle _args,String name) {
clss = _class;
args = _args;
this.name=name;
}
}
public TabsAdapter(Activity activity, ViewPager pager) {
super(activity.getFragmentManager());
mContext = activity;
mActionBar = activity.getActionBar();
mViewPager = pager;
mViewPager.setAdapter(this);
mViewPager.setOnPageChangeListener(this);
mActivity = activity;
}
public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
TabInfo info = new TabInfo(clss, args,tab.getText()+"");
tab.setTag(info.name);
tab.setTabListener(this);
mTabs.add(info);
mActionBar.addTab(tab);
notifyDataSetChanged();
}
@Override
public int getCount() {
return mTabs.size();
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
// return super.getItemPosition(object);
}
@Override
public Fragment getItem(int position) {
TabInfo info = mTabs.get(position);
Fragment fr = Fragment.instantiate(mContext, info.clss.getName(), info.args);
//
// //addFragment (fr, position);
return fr;
}
public void addFragment(Fragment f, int location) {
if (fragments.size() == 0)
fragments.add(f);
else
fragments.add(location, f);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
mActionBar.setSelectedNavigationItem(position);
}
@Override
public void onPageScrollStateChanged(int state) {
}
@Override
public void onTabSelected(ActionBar.Tab tab, android.app.FragmentTransaction ft) {
Object tag = tab.getTag();
for (int i=0; i<mTabs.size(); i++) {
if (mTabs.get(i).name == tag) {
updateDataSet(i);
mViewPager.setCurrentItem(i);
}
}
}
@Override
public void onTabReselected(ActionBar.Tab tab, android.app.FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onTabUnselected(ActionBar.Tab tab, android.app.FragmentTransaction ft) {
// TODO Auto-generated method stub
}
public void updateDataSet(int pos)
{
//Let's update the dataset for the selected genre
Fragment fragment =
(mActivity.getFragmentManager().findFragmentByTag(
"android:switcher:"+ mViewPager.getId()+":"+pos));
//TabFragment fragment = (TabFragment) getItem(pos);
if(fragment != null) // could be null if not instantiated yet
{
if(fragment.getView() != null)
{
// no need to call if fragment's onDestroyView()
//has since been called.
if(fragment instanceof Tab1Fragment){
((Tab1Fragment) fragment).refresh();
}
else if(fragment instanceof Tab2Fragment){
( (Tab2Fragment) fragment).refresh();
}
}
}
}