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> |
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> |
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> |
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> |
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> |
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> |
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> |
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); } } |
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); } } |
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。
