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：
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<?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>
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2、res/drawable 下的 home_btn_bg.xml 源码：
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<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>
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3、res/values 下的源码：
dimens.xml源码：
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<?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>
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drawables.xml源码：
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<?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>
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ids.xml源码：
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<?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>
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strings.xml源码：
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<?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>
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styles.xml源码：
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<?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>
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4、 src/com.andyidea.tabdemo包下面各个ui界面类源码：
maintabactivity.java源码：
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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);
}
}
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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：
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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);
}
}
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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。