ActionBar简单使用介绍和Tab切换的应用

理解：ActionBar就是我们上面头部看见的类似导航栏的东东，getActionBar方法可以获取到ActionBar这个对象

可以通过menu布局文件添加按钮，可以通过actionvBar对象把返回前头显示出来，

 android:label="@string/app_name"            android:icon="@drawable/cc"

分别对应了actionBar的名称和图片，如果getActionBar获取不到actionBar，也注意使用的Theme,请看最底部

ActionBar还可以用于Tab切换，例如下面的

package com.example.lenovo.myapplication;import android.app.ActionBar;import android.app.Activity;import android.app.FragmentTransaction;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;public class MainActivity extends Activity implements ActionBar.TabListener {    Button btn;    ActionBar actionBar = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        actionBar = this.getActionBar();        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);        actionBar.setDisplayHomeAsUpEnabled(true);        actionBar.addTab(actionBar.newTab().setText("tab1")                .setTabListener(this));        actionBar.addTab(actionBar.newTab().setText("tab2")                .setTabListener(this));        actionBar.addTab(actionBar.newTab().setText("tab3")                .setTabListener(this));        btn=(Button)findViewById(R.id.button);        btn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(MainActivity.this,SecondActivity.class);                startActivity(intent);            }        });    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.menu_main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        if(item.getItemId() == android.R.id.home)        {            finish();            return true;        }        //noinspection SimplifiableIfStatement        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }    @Override    public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {        MyFragment frag = new MyFragment();        int index = tab.getPosition() + 1;        Bundle bundle = new Bundle();        bundle.putInt("key", index);        frag.setArguments(bundle);        FragmentTransaction action = MainActivity.this.getFragmentManager()                .beginTransaction();        action.replace(R.id.container, frag);        action.commit();    }    @Override    public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {    }    @Override    public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {    }}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="New Button"        android:id="@+id/button"        android:layout_alignParentTop="true"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="64dp" />    <LinearLayout        android:id="@+id/container"        android:orientation="vertical"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_below="@id/button"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"></LinearLayout></RelativeLayout>

<menu xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools" tools:context=".MainActivity">    <item android:id="@+id/action_settings" android:title="@string/action_settings"        android:orderInCategory="100" app:showAsAction="never" /></menu>

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.lenovo.myapplication" >    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".MainActivity"            android:label="@string/app_name"            android:icon="@drawable/cc"            >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity            android:name=".SecondActivity"            android:label="@string/title_activity_second" >        </activity>    </application></manifest>

<resources>    <!-- Base application theme. 这里要使用parent得用这个，否则程序中获取不到ActionBar -->    <style name="AppTheme" parent="@android:style/Theme.Holo.Light">        <!-- Customize your theme here. -->    </style></resources>

部分参考：http://my.oschina.net/summerpxy/blog/174508

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