关于在Android中如何设置底部导航栏

Android应用底部导航栏(选项卡)实例
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: [html]

 

< ?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:www.2cto.com [html]

 

< ?xml version="1.0" encoding="UTF-8"?> 
< 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 [html]

 

< ?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:[html]

  < ?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: [html]

 

< ?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: [html]

< ?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: [html]

< ?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: [html]

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: [html]

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:       

         

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