首先建立一个TabListener的类,注意要应用ActionBar.TabListener接口。
public static class TabListener<T extends Fragment> implements ActionBar.TabListener {
private Fragment mFragment;
private final Activity mActivity;
private final String mTag;
private final Class<T> mClass;
/** Constructor used each time a new tab is created.
* @param activity The host Activity, used to instantiate the fragment
* @param tag The identifier tag for the fragment
* @param clz The fragment's Class, used to instantiate the fragment
*/
public TabListener(Activity activity, String tag, Class<T> clz) {
mActivity = activity;
mTag = tag;
mClass = clz;
}
/* The following are each of the ActionBar.TabListener
callbacks */
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// Check if the fragment is already initialized
if (mFragment == null) {
// If not, instantiate and add it to the activity
mFragment = Fragment.instantiate(mActivity, mClass.getName());
ft.add(android.R.id.content, mFragment, mTag);
} else {
// If it exists, simply attach it in order to show it
ft.attach(mFragment);
}
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
if (mFragment != null) {
// Detach the fragment, because another one is being attached
ft.detach(mFragment);
}
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// User selected the already selected tab. Usually do nothing.
}
}
下面是如何添加tab的代码
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Notice that setContentView() is not used, because we use the root // android.R.id.content as the container for each fragment // setup action bar for tabs ActionBar actionBar = getActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); actionBar.setDisplayShowTitleEnabled(false); Tab tab = actionBar.newTab() .setText(R.string.artist) .setTabListener(new TabListener<ArtistFragment>( this, "artist", ArtistFragment.class)); actionBar.addTab(tab); tab = actionBar.newTab() .setText(R.string.album) .setTabListener(new TabListener<AlbumFragment>( this, "album", AlbumFragment.class)); actionBar.addTab(tab); }