Android实现底部导航栏功能（选项卡）

现在很多android的应用都采用底部导航栏的功能，这样可以使得用户在使用过程中随意切换不同的页面，现在我采用tabhost组件来自定义一个底部的导航栏的功能。
我们先看下该demo实例的框架图：

其中各个类的作用以及资源文件就不详细解释了，还有资源图片(在该demo中借用了其它应用程序的资源图片)也不提供了，大家可以自行更换自己需要的资源图片。直接上各个布局文件或各个类的代码：
1、 res/layout目录下的 maintabs.xml 源码：

<?xml version="1.0" encoding="utf-8"?> 
<tabhost android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent" 
 xmlns:android="http://schemas.android.com/apk/res/android"> 
 <linearlayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> 
  <framelayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="0.0dip" android:layout_weight="1.0" /> 
  <tabwidget android:id="@android:id/tabs" android:visibility="gone" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="0.0" /> 
   <radiogroup 
    android:gravity="center_vertical" android:layout_gravity="bottom" android:orientation="horizontal" android:id="@id/main_radio" android:background="@drawable/maintab_toolbar_bg" 
    android:layout_width="fill_parent" android:layout_height="wrap_content"> 
    <radiobutton android:id="@id/radio_button0" android:layout_margintop="2.0dip" android:text="@string/main_home" android:drawabletop="@drawable/icon_1_n" style="@style/main_tab_bottom" /> 
    <radiobutton android:id="@id/radio_button1" android:layout_margintop="2.0dip" android:text="@string/main_news" android:drawabletop="@drawable/icon_2_n" style="@style/main_tab_bottom" /> 
    <radiobutton android:id="@id/radio_button2" android:layout_margintop="2.0dip" android:text="@string/main_manage_date" android:drawabletop="@drawable/icon_3_n" style="@style/main_tab_bottom" /> 
    <radiobutton android:id="@id/radio_button3" android:layout_margintop="2.0dip" android:text="@string/main_friends" android:drawabletop="@drawable/icon_4_n" style="@style/main_tab_bottom" /> 
    <radiobutton android:id="@id/radio_button4" android:layout_margintop="2.0dip" android:text="@string/more" android:drawabletop="@drawable/icon_5_n" style="@style/main_tab_bottom" /> 
   </radiogroup> 
 </linearlayout> 
</tabhost> 

2、res/drawable 下的 home_btn_bg.xml 源码：

<selector 
 xmlns:android="http://schemas.android.com/apk/res/android"> 
 <item android:state_focused="true" android:state_enabled="true" android:state_pressed="false" android:drawable="@drawable/home_btn_bg_s" /> 
 <item android:state_enabled="true" android:state_pressed="true" android:drawable="@drawable/home_btn_bg_s" /> 
 <item android:state_enabled="true" android:state_checked="true" android:drawable="@drawable/home_btn_bg_d" /> 
 <item android:drawable="@drawable/transparent" /> 
</selector> 

3、res/values 下的源码：
dimens.xml源码：

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
 
 <dimen name="bottom_tab_font_size">10.0sp</dimen> 
 <dimen name="bottom_tab_padding_up">5.0dip</dimen> 
 <dimen name="bottom_tab_padding_drawable">2.0dip</dimen> 
 <dimen name="switch_logo_bottom_padding">30.0sp</dimen> 
 <dimen name="widget_height">100.0dip</dimen> 
 <dimen name="sta_height">48.0dip</dimen> 
 <dimen name="large_padding_length">20.0dip</dimen> 
 <dimen name="widget_write_margin_top">19.0dip</dimen> 
 <dimen name="widget_write_margin_left">10.0dip</dimen> 
 <dimen name="widget_content_margin_top">20.0dip</dimen> 
 <dimen name="widget_content_margin_left">10.0dip</dimen> 
 <dimen name="widget_logo_size">35.0dip</dimen> 
 <dimen name="title_height">74.0dip</dimen> 
 <dimen name="new_blog_size">70.0dip</dimen> 
 <dimen name="emotion_item_view_height">13.299988dip</dimen> 
 <dimen name="splash_test_top_margin_top">20.0dip</dimen> 
 <dimen name="splash_test_center_margin_right">0.0dip</dimen> 
 <dimen name="title_text_size">20.0sp</dimen> 
 <dimen name="normal_padding_length">10.0dip</dimen> 
 <dimen name="no_result_padding_length">50.0dip</dimen> 
 
</resources> 

drawables.xml源码：

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
 
 <item type="drawable" name="ltgray">#fff4f4f4</item> 
 <item type="drawable" name="ltyellow">#fffff4db</item> 
 <item type="drawable" name="black">#ff000000</item> 
 <item type="drawable" name="transparent">#00000000</item> 
 <item type="drawable" name="widget_edit_block_bg_normal">@android:color/transparent</item> 
 <item type="drawable" name="transparent_background">#99000000</item> 
 <item type="drawable" name="list_background">#fff4f4f4</item> 
 <item type="drawable" name="namcard_picker_bkg_normal">#ff272727</item> 
 <item type="drawable" name="namcard_picker_bkg_hover">#ff333333</item> 
 
</resources> 

ids.xml源码：

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
 
 <item type="id" name="main_radio">false</item> 
 <item type="id" name="radio_button0">false</item> 
 <item type="id" name="radio_button1">false</item> 
 <item type="id" name="radio_button2">false</item> 
 <item type="id" name="radio_button3">false</item> 
 <item type="id" name="radio_button4">false</item> 
 
</resources> 

strings.xml源码：

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
 <string name="hello">hello world, maintabactivity!</string> 
 <string name="app_name">tabdemo</string> 
 <string name="main_news">消息</string> 
 <string name="main_home">首页</string> 
 <string name="more">更多</string> 
 <string name="main_manage_date">时间</string> 
 <string name="main_friends">好友</string> 
</resources> 

styles.xml源码：

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
 
  <style name="main_tab_bottom"> 
  <item name="android:textsize">@dimen/bottom_tab_font_size</item> 
  <item name="android:textcolor">#ffffffff</item> 
  <item name="android:ellipsize">marquee</item> 
  <item name="android:gravity">center_horizontal</item> 
  <item name="android:background">@drawable/home_btn_bg</item> 
  <item name="android:paddingtop">@dimen/bottom_tab_padding_up</item> 
  <item name="android:paddingbottom">2.0dip</item> 
  <item name="android:layout_width">fill_parent</item> 
  <item name="android:layout_height">wrap_content</item> 
  <item name="android:layout_marginbottom">2.0dip</item> 
  <item name="android:button">@null</item> 
  <item name="android:singleline">true</item> 
  <item name="android:drawablepadding">@dimen/bottom_tab_padding_drawable</item> 
  <item name="android:layout_weight">1.0</item> 
 </style> 
 
</resources> 

4、 src/com.andyidea.tabdemo包下面各个ui界面类源码：
maintabactivity.java源码：

package com.andyidea.tabdemo; 
 
import android.app.tabactivity; 
import android.content.intent; 
import android.os.bundle; 
import android.view.window; 
import android.widget.compoundbutton; 
import android.widget.radiobutton; 
import android.widget.compoundbutton.oncheckedchangelistener; 
import android.widget.tabhost; 
 
public class maintabactivity extends tabactivity implements oncheckedchangelistener{ 
  
 private tabhost mtabhost; 
 private intent maintent; 
 private intent mbintent; 
 private intent mcintent; 
 private intent mdintent; 
 private intent meintent; 
  
 /** called when the activity is first created. */ 
 @override 
 public void oncreate(bundle savedinstancestate) { 
  super.oncreate(savedinstancestate); 
  requestwindowfeature(window.feature_no_title); 
  setcontentview(r.layout.maintabs); 
   
  this.maintent = new intent(this,aactivity.class); 
  this.mbintent = new intent(this,bactivity.class); 
  this.mcintent = new intent(this,cactivity.class); 
  this.mdintent = new intent(this,dactivity.class); 
  this.meintent = new intent(this,eactivity.class); 
   
  ((radiobutton) findviewbyid(r.id.radio_button0)) 
  .setoncheckedchangelistener(this); 
  ((radiobutton) findviewbyid(r.id.radio_button1)) 
  .setoncheckedchangelistener(this); 
  ((radiobutton) findviewbyid(r.id.radio_button2)) 
  .setoncheckedchangelistener(this); 
  ((radiobutton) findviewbyid(r.id.radio_button3)) 
  .setoncheckedchangelistener(this); 
  ((radiobutton) findviewbyid(r.id.radio_button4)) 
  .setoncheckedchangelistener(this); 
   
  setupintent(); 
 } 
 
 @override 
 public void oncheckedchanged(compoundbutton buttonview, boolean ischecked) { 
  if(ischecked){ 
   switch (buttonview.getid()) { 
   case r.id.radio_button0: 
    this.mtabhost.setcurrenttabbytag("a_tab"); 
    break; 
   case r.id.radio_button1: 
    this.mtabhost.setcurrenttabbytag("b_tab"); 
    break; 
   case r.id.radio_button2: 
    this.mtabhost.setcurrenttabbytag("c_tab"); 
    break; 
   case r.id.radio_button3: 
    this.mtabhost.setcurrenttabbytag("d_tab"); 
    break; 
   case r.id.radio_button4: 
    this.mtabhost.setcurrenttabbytag("more_tab"); 
    break; 
   } 
  } 
   
 } 
  
 private void setupintent() { 
  this.mtabhost = gettabhost(); 
  tabhost localtabhost = this.mtabhost; 
 
  localtabhost.addtab(buildtabspec("a_tab", r.string.main_home, 
    r.drawable.icon_1_n, this.maintent)); 
 
  localtabhost.addtab(buildtabspec("b_tab", r.string.main_news, 
    r.drawable.icon_2_n, this.mbintent)); 
 
  localtabhost.addtab(buildtabspec("c_tab", 
    r.string.main_manage_date, r.drawable.icon_3_n, 
    this.mcintent)); 
 
  localtabhost.addtab(buildtabspec("d_tab", r.string.main_friends, 
    r.drawable.icon_4_n, this.mdintent)); 
 
  localtabhost.addtab(buildtabspec("more_tab", r.string.more, 
    r.drawable.icon_5_n, this.meintent)); 
 
 } 
  
 private tabhost.tabspec buildtabspec(string tag, int reslabel, int resicon, 
   final intent content) { 
  return this.mtabhost.newtabspec(tag).setindicator(getstring(reslabel), 
    getresources().getdrawable(resicon)).setcontent(content); 
 } 
} 

其中 aactivity.java 与 bactivity.java ，cactivity.java ，dactivity.java ，eactivity.java 中的源码都一样，只是用来表示不同的界面展示，故这里只列出 aactivity.java的源码：

package com.andyidea.tabdemo; 
 
import android.app.activity; 
import android.os.bundle; 
import android.view.gravity; 
import android.widget.textview; 
 
public class aactivity extends activity{ 
  
 @override 
 public void oncreate(bundle savedinstancestate) { 
  super.oncreate(savedinstancestate); 
   
  textview tv = new textview(this); 
  tv.settext("this is a activity!"); 
  tv.setgravity(gravity.center); 
  setcontentview(tv); 
 } 
 
} 

最后，大家别忘了在 androidmanifest.xml 文件中注册各个 activity 组件哦。好了，现在我们看下我们程序运行的效果图：

源码下载： android实现底部导航栏功能（选项卡）

到此就实现了一个比较流行的底部导航栏的功能了，希望本文所述对大家学习android软件编程有所帮助。