menu bar 的選單建立

manifest

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.robert.sample20"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="14"

        android:targetSdkVersion="19" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="TabBarNavigation"

            android:uiOptions="splitActionBarWhenNarrow">

            <intent-filter >

                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>

            </intent-filter>

        </activity>

    </application>

</manifest>

 menu 

<?xml version="1.0" encoding="utf-8"?>

<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item

        android:id="@+id/settings"

        android:title="settings"

        android:showAsAction="always"/>

    <item

        android:id="@+id/about"

        android:title="about"

        android:showAsAction="always"/>

  

</menu>

MainActivity

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;

import android.view.Menu;

import android.view.MenuInflater;

import android.view.MenuItem;

import android.widget.Toast;

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);

               

        }

       

       

       

        @Override

        public boolean onCreateOptionsMenu(Menu menu) {

                MenuInflater inflater=getMenuInflater();

                inflater.inflate(R.menu.main_menu, menu);

                return true;

        }

       

       

        @Override

        public boolean onMenuItemSelected(int featureId, MenuItem item) {

                switch(item.getItemId()){

                case R.id.settings:

                        handleSettings();

                        break;

                case R.id.about:

                        handleAbout();

                        break;

                }

                return true;

        }

        private void handleSettings(){

                Toast.makeText(this, "clickSetting", Toast.LENGTH_SHORT).show();

        }

       

        private void handleAbout(){

                Toast.makeText(this, "clickABout", Toast.LENGTH_SHORT).show();

        }

        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);

                        }

                       

                }

               

        }

       

       

}