按TAB於Fragment間切換

package com.robert.sample20;

import android.app.ActionBar;

import android.app.ActionBar.Tab;

import android.app.Activity;

import android.app.Fragment;

import android.app.FragmentTransaction;

import android.os.Bundle;

public class MainActivity extends Activity {

   @Override

   protected void onCreate(Bundle savedInstanceState) {

     super.onCreate(savedInstanceState);

     setContentView(R.layout.main);

    

     ActionBar actionBar=getActionBar();

     actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    

     ActionBar.Tab tab=actionBar

           .newTab()

           .setText("First Tab")

           .setTabListener(new AllTabListener<FragmentA>(this,"fragmentA",FragmentA.class));

    

     actionBar.addTab(tab);

    

     tab=actionBar.newTab()

           .setText("Second Tab")

           .setTabListener(new AllTabListener<FragmentB>(this,"fragmentB",FragmentB.class));

    

     actionBar.addTab(tab);

    

     tab=actionBar.newTab()

           .setText("Third Tab")

           .setTabListener(new AllTabListener<FragmentC>(this,"fragmentC",FragmentC.class));

     actionBar.addTab(tab);

    

   }

  

   public static class AllTabListener<T extends Fragment> implements ActionBar.TabListener{

     private final Class<T> mClass;

     private final Activity mActivity;

     private final String mTag;

     private  T mFragment;

    

     public AllTabListener(Activity activity,String tag,Class<T> clz){

        mActivity=activity;

        mClass=clz;

        mTag=tag;

     }

     @Override

    public void onTabReselected(Tab tab, FragmentTransaction ft) {

       

       

     }

     @Override

     public void onTabSelected(Tab tab, FragmentTransaction ft) {

        if(mFragment==null){

        mFragment=(T)T.instantiate(mActivity,mClass.getName());

        ft.add(R.id.viewContainer, mFragment,mTag);

        }else{

           ft.attach(mFragment);

        }

       

     }

     @Override

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {

        if(mFragment!=null){

           ft.detach(mFragment);

        }

       

     }

    

   }

  

  

}