[Android] タブ管理クラス

TabManager.java

import android.app.ActionBar;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;

public class TabManager {

    public static <T extends Fragment> ActionBar.Tab createTab(
            Activity activity, ActionBar actionBar, int fragmentContainerId,
            int text_resid, String tag, Class<T> clazz, boolean select) {
        ActionBar.Tab tab = actionBar.newTab();
        tab.setText(text_resid);
        tab.setTabListener(new SupportFragmentTabListener<T>(
                fragmentContainerId, activity, tag, clazz));

        actionBar.addTab(tab);
        if (select) {
            actionBar.selectTab(tab);
        }
        return tab;
    }

    public static class SupportFragmentTabListener<T extends Fragment>
            implements ActionBar.TabListener {
        private Fragment mFragment;
        private Activity mActivity;
        private String mTag;
        private Class<T> mClass;
        private int mfragmentContainerId;

        public SupportFragmentTabListener(int fragmentContainerId,
                                          Activity activity, String tag, Class<T> clz) {
            mActivity = activity;
            mTag = tag;
            mClass = clz;
            mfragmentContainerId = fragmentContainerId;
        }

        /* The following are each of the ActionBar.TabListener callbacks */

        public void onTabSelected(ActionBar.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(mfragmentContainerId, mFragment, mTag);
            } else {
                // If it exists, simply attach it in order to show it
                ft.attach(mFragment);
            }
        }

        public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction sft) {
            if (mFragment != null) {
                // Detach the fragment, because another one is being attached
                sft.detach(mFragment);
            }
        }

        public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
            // User selected the already selected tab. Usually do nothing.
        }
    }
}