我设法使用 Sherlock ActionBar 设置了三个选项卡。唯一的问题是,当方向改变时,标签不能再被点击了。似乎未调用 onTabSelected() 。示例:我是纵向的,并且选择了 tab2。我变成了风景。Tab2 仍处于选中状态,我点击 tab3 但没有任何反应。然后当我再次回到纵向时,会显示 tab3。我正在 Android 2.3.6 中进行测试。
这是主要活动:
public class Activity_Main extends SherlockFragmentActivity {
ActionBar.Tab tab1, tab2, tab3;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTabs();
}
void setTabs(){
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
tab1 = actionBar.newTab();
tab2 = actionBar.newTab();
tab3 = actionBar.newTab();
tab1.setText("Week");
tab2.setText("Today");
tab3.setText("ToDo");
tab1.setTabListener(new TabListener<Fragment_Start_Week>(this, "week", Fragment_Start_Week.class));
tab2.setTabListener(new TabListener<Fragment_Start_Today>(this, "today", Fragment_Start_Today.class));
tab3.setTabListener(new TabListener<Fragment_Start_Todo>(this, "todo", Fragment_Start_Todo.class));
}
private class TabListener<T extends SherlockFragment> implements com.actionbarsherlock.app.ActionBar.TabListener{
private SherlockFragment 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) {
SherlockFragment preInitializedFragment = (SherlockFragment) ((FragmentActivity) mActivity).getSupportFragmentManager().findFragmentByTag(mTag);
// Check if the fragment is already initialized
if (mFragment == null && preInitializedFragment == null) {
// If not, instantiate and add it to the activity
mFragment = (SherlockFragment) SherlockFragment.instantiate(mActivity, mClass.getName());
ft.add(android.R.id.content, mFragment, mTag);
} else if (mFragment != null) {
// If it exists, simply attach it in order to show it
ft.attach(mFragment);
} else if (preInitializedFragment != null) {
ft.attach(preInitializedFragment);
mFragment = preInitializedFragment;
}
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
if (mFragment != null) {
// Detach the fragment, because another one is being attached
ft.detach(mFragment);
}
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
}
}
这是一个片段:
public class Fragment_Start_Week extends SherlockFragment implements OnClickListener{
void create_table() {
...
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup group, Bundle saved)
{
return inflater.inflate(R.layout.fragment_start_week, group, false);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
create_table();
}
@Override
public void onClick(View view) {
...
}
}
TIA