ActionBar+fragment实现页面导航

为保证android2.0以上均能运行，使用support.v7库下的actionbar及fragment

继承自AppCompatActivity（ActionBarActivity已过时）使用getSupportActionBar()得到ActionBar，

ActionBar.Tab，这里Tab必须设置监听，在监听中实现Fragment的切换。

这里重点提一下，Theme主题一定要适配，因为我使用的是AppCompatActivity所以，android:theme="@style/Theme.AppCompat.Light" 

如果不用AppCompatActivity一定要注意使用相应的主题适配，否则会getActionBar/getSupportActionbar的时候拿不到东西，空指针报错

package com.example.yasin.actionbarusing;


import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;


public class MainActivity extends AppCompatActivity {

    ActionBar actionBar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        actionBar = getSupportActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        ActionBar.Tab tab1 = actionBar.newTab().setText("Tab1");
        tab1.setTabListener(new MyTabListener(new Fragment1()));
        ActionBar.Tab tab2 = actionBar.newTab().setText("Tab2");
        tab2.setTabListener(new MyTabListener(new Fragment2()));
        actionBar.addTab(tab1);
        actionBar.addTab(tab2);
    }

    class MyTabListener implements ActionBar.TabListener{

        private Fragment fragment;
        public MyTabListener (Fragment fragment){
            this.fragment=fragment;
        }


        @Override
        public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
            ft.replace(R.id.context,fragment);
        }

        @Override
        public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {

        }

        @Override
        public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
            //ft.remove(fragment);
        }
    }

}

package com.example.yasin.actionbarusing;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * Created by Yasin on 2016/1/3.
 */
public class Fragment1 extends Fragment{
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment1,container,false);

        return view;
    }
}

效果图：